INFO: task kworker/u4:3:47 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:3 state:D stack:21872 pid:47 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
io_schedule+0x7c/0xd0 kernel/sched/core.c:8799
rq_qos_wait+0x227/0x350 block/blk-rq-qos.c:282
__wbt_wait block/blk-wbt.c:522 [inline]
wbt_wait+0x384/0x650 block/blk-wbt.c:586
__rq_qos_throttle+0x61/0xa0 block/blk-rq-qos.c:66
rq_qos_throttle block/blk-rq-qos.h:207 [inline]
blk_mq_get_new_requests block/blk-mq.c:2924 [inline]
blk_mq_submit_bio+0x8ef/0x2100 block/blk-mq.c:3023
__submit_bio+0x1a2/0x290 block/blk-core.c:591
__submit_bio_noacct_mq block/blk-core.c:668 [inline]
submit_bio_noacct_nocheck+0x79b/0xaa0 block/blk-core.c:697
ext4_io_submit fs/ext4/page-io.c:378 [inline]
io_submit_add_bh fs/ext4/page-io.c:421 [inline]
ext4_bio_write_page+0x19f2/0x2ad0 fs/ext4/page-io.c:559
mpage_submit_page+0x17a/0x210 fs/ext4/inode.c:2144
mpage_process_page_bufs+0x6c6/0x8a0 fs/ext4/inode.c:2258
mpage_prepare_extent_to_map+0xba4/0x1690 fs/ext4/inode.c:2683
ext4_writepages+0x9da/0x2e70 fs/ext4/inode.c:2811
do_writepages+0x3c6/0x640 mm/page-writeback.c:2491
__writeback_single_inode+0x153/0x1170 fs/fs-writeback.c:1673
writeback_sb_inodes+0xad5/0x17f0 fs/fs-writeback.c:1964
__writeback_inodes_wb+0x12a/0x3f0 fs/fs-writeback.c:2035
wb_writeback+0x484/0xd40 fs/fs-writeback.c:2140
wb_check_old_data_flush fs/fs-writeback.c:2240 [inline]
wb_do_writeback fs/fs-writeback.c:2293 [inline]
wb_workfn+0xb68/0xee0 fs/fs-writeback.c:2321
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task jbd2/sda1-8:3600 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:24560 pid:3600 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
io_schedule+0x7c/0xd0 kernel/sched/core.c:8799
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_buffer include/linux/buffer_head.h:385 [inline]
jbd2_journal_commit_transaction+0x2f0f/0x5f30 fs/jbd2/commit.c:849
kjournald2+0x40b/0x800 fs/jbd2/journal.c:210
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task udevd:3638 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:23120 pid:3638 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
io_schedule+0x7c/0xd0 kernel/sched/core.c:8799
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_buffer include/linux/buffer_head.h:385 [inline]
__ext4_find_entry+0x1311/0x1d30 fs/ext4/namei.c:1683
ext4_lookup_entry fs/ext4/namei.c:1776 [inline]
ext4_lookup+0x181/0x710 fs/ext4/namei.c:1844
__lookup_slow+0x29d/0x3f0 fs/namei.c:1698
lookup_slow+0x53/0x70 fs/namei.c:1715
walk_component+0x2ad/0x3e0 fs/namei.c:2006
lookup_last fs/namei.c:2463 [inline]
path_lookupat+0x148/0x420 fs/namei.c:2487
filename_lookup+0x229/0x580 fs/namei.c:2516
vfs_statx+0x10e/0x610 fs/stat.c:229
vfs_fstatat fs/stat.c:267 [inline]
__do_sys_newfstatat fs/stat.c:437 [inline]
__se_sys_newfstatat fs/stat.c:431 [inline]
__x64_sys_newfstatat+0x190/0x240 fs/stat.c:431
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f28f5511b0a
RSP: 002b:00007fff09e39978 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000561babd94400 RCX: 00007f28f5511b0a
RDX: 00007fff09e39980 RSI: 0000561babd82296 RDI: 00000000ffffff9c
RBP: 0000561bdba9d148 R08: 0000000027ff8ecf R09: 00029be3326f0c0e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff09e39980 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz.0.1167:8689 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1167 state:D stack:24592 pid:8689 ppid:4281 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
rwsem_down_write_slowpath+0xc99/0x1160 kernel/locking/rwsem.c:1189
inode_lock_nested include/linux/fs.h:799 [inline]
filename_create+0x20b/0x450 fs/namei.c:3927
do_mkdirat+0xa5/0x440 fs/namei.c:4172
__do_sys_mkdirat fs/namei.c:4197 [inline]
__se_sys_mkdirat fs/namei.c:4195 [inline]
__x64_sys_mkdirat+0x85/0x90 fs/namei.c:4195
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffb89f9cfc7
RSP: 002b:00007ffb8ae93e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ffb8ae93ee0 RCX: 00007ffb89f9cfc7
RDX: 00000000000001ff RSI: 0000200000000040 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000040
R13: 00007ffb8ae93ea0 R14: 0000000000000000 R15: 0000000000000000
INFO: task modprobe:8692 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:modprobe state:D stack:25264 pid:8692 ppid:4434 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
io_schedule+0x7c/0xd0 kernel/sched/core.c:8799
bit_wait_io+0xd/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit+0x9b/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x138/0x190 kernel/sched/wait_bit.c:64
wait_on_buffer include/linux/buffer_head.h:385 [inline]
__ext4_find_entry+0x1311/0x1d30 fs/ext4/namei.c:1683
ext4_lookup_entry fs/ext4/namei.c:1776 [inline]
ext4_lookup+0x181/0x710 fs/ext4/namei.c:1844
__lookup_slow+0x29d/0x3f0 fs/namei.c:1698
lookup_slow+0x53/0x70 fs/namei.c:1715
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x976/0xea0 fs/namei.c:2333
path_openat+0x285/0x2f10 fs/namei.c:3830
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
do_sys_open fs/open.c:1336 [inline]
__do_sys_openat fs/open.c:1352 [inline]
__se_sys_openat fs/open.c:1347 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1347
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0fc8ce90ba
RSP: 002b:00007ffd7c952f28 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffd7c952fa0 RCX: 00007f0fc8ce90ba
RDX: 0000000000080000 RSI: 00007ffd7c952fa0 RDI: 00000000ffffff9c
RBP: 00007ffd7c952f90 R08: 00007ffd7c953197 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000011
R13: 00007f0fc8cc5000 R14: 00007ffd7c9531b0 R15: 0000000000000000
INFO: task kworker/u4:19:8711 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:19 state:D stack:27584 pid:8711 ppid:4914 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
rwsem_down_read_slowpath+0x513/0x880 kernel/locking/rwsem.c:1094
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x94/0x2d0 kernel/locking/rwsem.c:1522
inode_lock_shared include/linux/fs.h:774 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1714
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x976/0xea0 fs/namei.c:2333
path_openat+0x285/0x2f10 fs/namei.c:3830
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_open_execat+0x137/0x760 fs/exec.c:926
open_exec+0x3c/0x50 fs/exec.c:960
load_elf_binary+0x1a0a/0x2820 fs/binfmt_elf.c:925
search_binary_handler fs/exec.c:1764 [inline]
exec_binprm fs/exec.c:1805 [inline]
bprm_execve+0xaf7/0x17e0 fs/exec.c:1874
kernel_execve+0x87a/0x980 fs/exec.c:2039
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task kworker/u4:12:8713 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:12 state:D stack:27632 pid:8713 ppid:4477 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
rwsem_down_read_slowpath+0x513/0x880 kernel/locking/rwsem.c:1094
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x94/0x2d0 kernel/locking/rwsem.c:1522
inode_lock_shared include/linux/fs.h:774 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1714
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x976/0xea0 fs/namei.c:2333
path_openat+0x285/0x2f10 fs/namei.c:3830
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_open_execat+0x137/0x760 fs/exec.c:926
open_exec+0x3c/0x50 fs/exec.c:960
load_elf_binary+0x1a0a/0x2820 fs/binfmt_elf.c:925
search_binary_handler fs/exec.c:1764 [inline]
exec_binprm fs/exec.c:1805 [inline]
bprm_execve+0xaf7/0x17e0 fs/exec.c:1874
kernel_execve+0x87a/0x980 fs/exec.c:2039
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task kworker/u4:20:8715 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:20 state:D stack:27152 pid:8715 ppid:5325 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
rwsem_down_read_slowpath+0x513/0x880 kernel/locking/rwsem.c:1094
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x94/0x2d0 kernel/locking/rwsem.c:1522
inode_lock_shared include/linux/fs.h:774 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1714
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x976/0xea0 fs/namei.c:2333
path_openat+0x285/0x2f10 fs/namei.c:3830
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_open_execat+0x137/0x760 fs/exec.c:926
open_exec+0x3c/0x50 fs/exec.c:960
load_elf_binary+0x1a0a/0x2820 fs/binfmt_elf.c:925
search_binary_handler fs/exec.c:1764 [inline]
exec_binprm fs/exec.c:1805 [inline]
bprm_execve+0xaf7/0x17e0 fs/exec.c:1874
kernel_execve+0x87a/0x980 fs/exec.c:2039
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task kworker/u4:17:8726 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:17 state:D stack:27632 pid:8726 ppid:4528 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
rwsem_down_read_slowpath+0x513/0x880 kernel/locking/rwsem.c:1094
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x94/0x2d0 kernel/locking/rwsem.c:1522
inode_lock_shared include/linux/fs.h:774 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1714
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x976/0xea0 fs/namei.c:2333
path_openat+0x285/0x2f10 fs/namei.c:3830
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_open_execat+0x137/0x760 fs/exec.c:926
open_exec+0x3c/0x50 fs/exec.c:960
load_elf_binary+0x1a0a/0x2820 fs/binfmt_elf.c:925
search_binary_handler fs/exec.c:1764 [inline]
exec_binprm fs/exec.c:1805 [inline]
bprm_execve+0xaf7/0x17e0 fs/exec.c:1874
kernel_execve+0x87a/0x980 fs/exec.c:2039
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task kworker/u4:7:8727 blocked for more than 146 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:7 state:D stack:27632 pid:8727 ppid:4343 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
rwsem_down_read_slowpath+0x513/0x880 kernel/locking/rwsem.c:1094
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x94/0x2d0 kernel/locking/rwsem.c:1522
inode_lock_shared include/linux/fs.h:774 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1714
walk_component fs/namei.c:2006 [inline]
link_path_walk+0x976/0xea0 fs/namei.c:2333
path_openat+0x285/0x2f10 fs/namei.c:3830
do_filp_open+0x1ee/0x420 fs/namei.c:3861
do_open_execat+0x137/0x760 fs/exec.c:926
open_exec+0x3c/0x50 fs/exec.c:960
load_elf_binary+0x1a0a/0x2820 fs/binfmt_elf.c:925
search_binary_handler fs/exec.c:1764 [inline]
exec_binprm fs/exec.c:1805 [inline]
bprm_execve+0xaf7/0x17e0 fs/exec.c:1874
kernel_execve+0x87a/0x980 fs/exec.c:2039
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cb2e170 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2e990 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
#0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6529
2 locks held by kworker/u4:2/41:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90000b27d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
4 locks held by kworker/u4:3/47:
#0: ffff88801b2d1138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90000b87d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffff88814d76e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: trylock_super+0x1c/0xf0 fs/super.c:415
#3: ffff88814d770c18 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x213/0x2e70 fs/ext4/inode.c:2717
1 lock held by udevd/3638:
#0: ffff888025b37258 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#0: ffff888025b37258 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by crond/4012:
#0: ffff8880742d2218 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#0: ffff8880742d2218 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: open_last_lookups fs/namei.c:3600 [inline]
#0: ffff8880742d2218 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: path_openat+0x7d9/0x2f10 fs/namei.c:3831
2 locks held by getty/4027:
#0: ffff8880300cd098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
1 lock held by syz-executor/4260:
#0: ffff888074285fe8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:819 [inline]
#0: ffff888074285fe8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x62b/0x1590 mm/filemap.c:3247
2 locks held by kworker/u4:5/4302:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc900043e7d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:6/4330:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004537d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:7/4343:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004517d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:8/4344:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc900045a7d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:11/4434:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004b67d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:12/4477:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004d27d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:13/4485:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004d57d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:17/4528:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90004e5fd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:18/4692:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90005967d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:19/4914:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc9000c99fd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:20/5325:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc9001c0d7d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
2 locks held by syz.0.1167/8689:
#0: ffff88814d76e460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:799 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x20b/0x450 fs/namei.c:3927
1 lock held by modprobe/8692:
#0: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#0: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
2 locks held by kworker/u4:19/8711:
#0: ffff88807e792048 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88807e792048 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
2 locks held by kworker/u4:12/8713:
#0: ffff88807e7948c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88807e7948c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
2 locks held by kworker/u4:20/8715:
#0: ffff888029f67148 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff888029f67148 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
2 locks held by kworker/u4:17/8726:
#0: ffff88807e790548 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88807e790548 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
2 locks held by kworker/u4:7/8727:
#0: ffff88807e793b48 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88807e793b48 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
2 locks held by kworker/u4:18/8728:
#0: ffff88807e796a88 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88807e796a88 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.2.1193/8776:
#0: ffff888068a50460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:15/8777:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc9000c9cfd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
1 lock held by syz.1.1202/8804:
#0: ffff88807a7e2460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:5/8809:
#0: ffff8880274ee3c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff8880274ee3c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.2.1206/8825:
#0: ffff888068a50460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by syz.4.1213/8843:
#0: ffff88801e746460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by syz-executor/8864:
#0: ffff888074280fa8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:819 [inline]
#0: ffff888074280fa8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0x9aa/0x1590 mm/filemap.c:3262
1 lock held by syz.3.1221/8867:
#0: ffff8880772d8460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by syz.4.1224/8879:
#0: ffff88801e746460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:25/8880:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc9000db3fd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
1 lock held by syz.2.1231/8896:
#0: ffff888068a50460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by syz.4.1235/8910:
#0: ffff88801e746460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:6/8912:
#0: ffff88802d754208 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88802d754208 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.4.1239/8923:
#0: ffff88801e746460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:13/8934:
#0: ffff88802beb12c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88802beb12c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.4.1246/8942:
#0: ffff88801e746460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by syz.2.1248/8951:
#0: ffff888068a50460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:15/8953:
#0: ffff88802d4163c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88802d4163c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.1.1249/8957:
#0: ffff88807a7e2460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
3 locks held by kworker/u4:28/8958:
#0: ffff8880b8e3acd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x98/0x130 kernel/sched/core.c:546
#1: ffffc9000dce7d00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffff8880b8f28458 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x123/0x270 kernel/time/timer.c:999
2 locks held by kworker/u4:8/8979:
#0: ffff88807e0b3488 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88807e0b3488 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.1.1260/8989:
#0: ffff88807a7e2460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:2/8991:
#0: ffff88802fccc8c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88802fccc8c8 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.1.1262/9010:
#0: ffff88807a7e2460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
2 locks held by kworker/u4:25/9026:
#0: ffff88802fcc8c08 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1500 [inline]
#0: ffff88802fcc8c08 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xc6/0x17e0 fs/exec.c:1842
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:774 [inline]
#1: ffff888025ae0e08 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714
1 lock held by syz.4.1271/9031:
#0: ffff88801e746460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by syz.2.1274/9040:
#0: ffff888068a50460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x169d/0x2480 fs/coredump.c:823
1 lock held by dhcpcd/9066:
#0: ffff8880742a6e10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline]
#0: ffff8880742a6e10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:653 [inline]
#0: ffff8880742a6e10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x82/0x210 net/socket.c:1400
1 lock held by dhcpcd/9067:
#0: ffff88807d1bc130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline]
#0: ffff88807d1bc130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3282
1 lock held by dhcpcd/9068:
#0: ffff88801ebde130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline]
#0: ffff88801ebde130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xd40 net/packet/af_packet.c:3282
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf0e/0xf50 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lockdep_hardirqs_on_prepare+0xcd/0x7c0 kernel/locking/lockdep.c:4301
Code: c2 03 00 00 65 8b 05 c2 b1 9e 7e 85 c0 0f 85 b3 03 00 00 48 c7 c0 40 61 c1 96 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 57 05 00 00 <83> 3d 6c 9c 5d 15 00 75 79 c6 44 13 04 00 48 c7 44 24 40 00 00 00
RSP: 0018:ffffc90000107a00 EFLAGS: 00000097
RAX: 0000000000000004 RBX: 1ffff92000020f44 RCX: ffffffff96c16103
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff814f3cb6
RBP: ffffc90000107aa8 R08: ffff888058f082c3 R09: 1ffff1100b1e1058
R10: dffffc0000000000 R11: ffffed100b1e1059 R12: ffffffff89fc0f65
R13: ffff88814d50fe10 R14: dffffc0000000000 R15: 1ffff92000020f58
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dec23dd168 CR3: 000000007e6f1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49
__local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:426
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_nc_purge_paths+0x305/0x3a0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x31e/0x600 net/batman-adv/network-coding.c:720
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295