INFO: task kworker/u8:7:1026 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:7 state:D stack:24616 pid:1026 tgid:1026 ppid:2 task_flags:0x4248060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:4)
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
xlog_grant_head_wait+0x441/0xa00 fs/xfs/xfs_log.c:217
xlog_grant_head_check+0x286/0x420 fs/xfs/xfs_log.c:-1
xfs_log_reserve+0x2bc/0x780 fs/xfs/xfs_log.c:387
xfs_trans_reserve fs/xfs/xfs_trans.c:174 [inline]
xfs_trans_alloc+0x28a/0x990 fs/xfs/xfs_trans.c:260
xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4320 [inline]
xfs_bmapi_convert_delalloc+0x33e/0x1550 fs/xfs/libxfs/xfs_bmap.c:4446
xfs_map_blocks fs/xfs/xfs_aops.c:283 [inline]
xfs_writeback_range+0x6ab/0xf80 fs/xfs/xfs_aops.c:327
iomap_writeback_range fs/iomap/buffered-io.c:1901 [inline]
iomap_writeback_folio+0x1526/0x2490 fs/iomap/buffered-io.c:2027
iomap_writepages+0x161/0x2d0 fs/iomap/buffered-io.c:2089
xfs_vm_writepages+0x2eb/0x3d0 fs/xfs/xfs_aops.c:542
do_writepages+0x338/0x560 mm/page-writeback.c:2562
__writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1809
writeback_sb_inodes+0x9de/0x1af0 fs/fs-writeback.c:2120
__writeback_inodes_wb+0x114/0x250 fs/fs-writeback.c:2196
wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2307
wb_check_start_all fs/fs-writeback.c:2433 [inline]
wb_do_writeback fs/fs-writeback.c:2480 [inline]
wb_workfn+0x980/0x10f0 fs/fs-writeback.c:2518
process_one_work kernel/workqueue.c:3505 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3669
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task kworker/0:4:5776 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:4 state:D stack:24520 pid:5776 tgid:5776 ppid:2 task_flags:0x4248060 flags:0x00080000
Workqueue: xfs-conv/loop4 xfs_end_io
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
xlog_grant_head_wait+0x441/0xa00 fs/xfs/xfs_log.c:217
xlog_grant_head_check+0x286/0x420 fs/xfs/xfs_log.c:-1
xfs_log_reserve+0x2bc/0x780 fs/xfs/xfs_log.c:387
xfs_trans_reserve fs/xfs/xfs_trans.c:174 [inline]
xfs_trans_alloc+0x28a/0x990 fs/xfs/xfs_trans.c:260
xfs_setfilesize+0xbb/0x450 fs/xfs/xfs_aops.c:53
xfs_end_ioend_write fs/xfs/xfs_ioend.c:245 [inline]
xfs_end_io+0x807/0xc60 fs/xfs/xfs_ioend.c:294
process_one_work kernel/workqueue.c:3505 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3588
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3669
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.4.163:6808 blocked in I/O wait for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.163 state:D stack:21320 pid:6808 tgid:6794 ppid:5638 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
io_schedule+0x7f/0xd0 kernel/sched/core.c:8146
folio_wait_bit_common+0x6d0/0xcf0 mm/filemap.c:1327
folio_wait_writeback+0xb0/0x100 mm/page-writeback.c:3064
__filemap_fdatawait_range+0x184/0x2a0 mm/filemap.c:531
file_write_and_wait_range+0x2ab/0x440 mm/filemap.c:788
xfs_file_fsync+0x16b/0x560 fs/xfs/xfs_file.c:95
generic_write_sync include/linux/fs.h:2695 [inline]
xfs_file_buffered_write+0x72e/0x870 fs/xfs/xfs_file.c:1040
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x612/0xba0 fs/read_write.c:687
ksys_pwrite64 fs/read_write.c:1504 [inline]
__do_sys_pwrite64 fs/read_write.c:1512 [inline]
__se_sys_pwrite64 fs/read_write.c:1509 [inline]
__x64_sys_pwrite64+0x210/0x2c0 fs/read_write.c:1509
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007fb0bf59fb19
RSP: 002b:00007fb0c0501028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fb0bf826090 RCX: 00007fb0bf59fb19
RDX: 000000000000fdef RSI: 0000200000000f40 RDI: 0000000000000009
RBP: 00007fb0bf637b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb0bf826128 R14: 00007fb0bf826090 R15: 00007ffcfaebb8e8
INFO: task syz.4.163:6809 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.163 state:D stack:26568 pid:6809 tgid:6794 ppid:5638 task_flags:0x440140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
xlog_grant_head_wait+0x441/0xa00 fs/xfs/xfs_log.c:217
xlog_grant_head_check+0x286/0x420 fs/xfs/xfs_log.c:-1
xfs_log_reserve+0x2bc/0x780 fs/xfs/xfs_log.c:387
xfs_trans_reserve fs/xfs/xfs_trans.c:174 [inline]
xfs_trans_alloc+0x28a/0x990 fs/xfs/xfs_trans.c:260
xfs_trans_alloc_inode+0x141/0x4a0 fs/xfs/xfs_trans.c:1088
xfs_attr_set+0x7f3/0x13e0 fs/xfs/libxfs/xfs_attr.c:1183
xfs_xattr_set+0x188/0x2a0 fs/xfs/xfs_xattr.c:186
__vfs_setxattr+0x442/0x480 fs/xattr.c:223
__vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257
vfs_setxattr+0x151/0x370 fs/xattr.c:344
do_setxattr fs/xattr.c:662 [inline]
filename_setxattr+0x296/0x630 fs/xattr.c:690
path_setxattrat+0x408/0x450 fs/xattr.c:734
__do_sys_lsetxattr fs/xattr.c:775 [inline]
__se_sys_lsetxattr fs/xattr.c:771 [inline]
__x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:771
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007fb0bf59fb19
RSP: 002b:00007fb0c04e0028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007fb0bf826180 RCX: 00007fb0bf59fb19
RDX: 0000200000001000 RSI: 0000200000000fc0 RDI: 0000200000000f80
RBP: 00007fb0bf637b70 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb0bf826218 R14: 00007fb0bf826180 R15: 00007ffcfaebb8e8
INFO: task syz.6.185:6887 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.185 state:D stack:24072 pid:6887 tgid:6886 ppid:6145 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
wb_wait_for_completion+0x3ad/0x6f0 fs/fs-writeback.c:227
sync_inodes_sb+0x22a/0xbf0 fs/fs-writeback.c:3072
__iterate_supers+0x282/0x420 fs/super.c:953
ksys_sync fs/sync.c:102 [inline]
__ia32_sys_sync+0xa0/0x120 fs/sync.c:111
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x00007f771ab9fb19
RSP: 002b:00007f771baef028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f771ae25fa0 RCX: 00007f771ab9fb19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f771ae25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f771ae26038 R14: 00007f771ae25fa0 R15: 00007fffb881bfb8
Showing all locks held in the system:
locks held by kworker/1:0/27: 4, on CPU#1:
#0: ffff888023abb550 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff888023abb550 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff888023abb550 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#0: ffff888023abb550 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#1: ffffc90000a1fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90000a1fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90000a1fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#1: ffffc90000a1fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#2: ffff88802b03d1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#2: ffff88802b03d1d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30 drivers/usb/core/hub.c:5917
#3: ffff8880276881d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#3: ffff8880276881d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1106
locks held by khungtaskd/35: 1, last CPU#1:
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:4/64: 3, last CPU#0:
#0: ffff88813fe54150 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88813fe54150 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88813fe54150 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#0: ffff88813fe54150 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#1: ffffc9000205fc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc9000205fc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc9000205fc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#1: ffffc9000205fc40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#2: ffff8880277f6258 (&devlink->lock_key#5){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xb30 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:7/1026: 4, on CPU#1:
#0: ffff8880202f7950 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff8880202f7950 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff8880202f7950 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#0: ffff8880202f7950 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#1: ffffc900050b7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc900050b7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc900050b7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#1: ffffc900050b7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#2: ffff88802c4c0100 (&type->s_umount_key#75){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:642
#3: ffff88802c4c0668 (sb_internal#5){.+.+}-{0:0}, at: xfs_trans_alloc+0xcf/0x990 fs/xfs/xfs_trans.c:258
locks held by udevd/5006: 3, on CPU#1:
#0: ffff88804cb2f580 (&type->i_mutex_dir_key#4){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1041 [inline]
#0: ffff88804cb2f580 (&type->i_mutex_dir_key#4){++++}-{4:4}, at: lookup_slow+0x46/0x80 fs/namei.c:1941
#1: ffff8880772a92e0 (DCACHE_PAR_LOOKUP#5){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffff8880772a92e0 (DCACHE_PAR_LOOKUP#5){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffff8880772a92e0 (DCACHE_PAR_LOOKUP#5){+.+.}-{0:0}, at: __d_alloc_parallel+0x3a4/0x1740 fs/dcache.c:2891
#2: ffff88801d68c980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_iop_lookup+0x5f/0x320 fs/kernfs/dir.c:1258
locks held by getty/5393: 2, on CPU#0:
#0: ffff88802adca0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032362e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by kworker/1:4/5645: 2, on CPU#1:
#0: ffff888055cbc150 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff888055cbc150 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff888055cbc150 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#0: ffff888055cbc150 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#1: ffffc90003eafc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90003eafc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90003eafc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#1: ffffc90003eafc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
locks held by kworker/0:4/5776: 3, on CPU#0:
#0: ffff88802823e950 ((wq_completion)xfs-conv/loop4){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffff88802823e950 ((wq_completion)xfs-conv/loop4){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffff88802823e950 ((wq_completion)xfs-conv/loop4){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#0: ffff88802823e950 ((wq_completion)xfs-conv/loop4){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#1: ffffc90004c2fc40 ((work_completion)(&ip->i_ioend_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffc90004c2fc40 ((work_completion)(&ip->i_ioend_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffc90004c2fc40 ((work_completion)(&ip->i_ioend_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3470 [inline]
#1: ffffc90004c2fc40 ((work_completion)(&ip->i_ioend_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3588
#2: ffff88802c4c0668 (sb_internal#5){.+.+}-{0:0}, at: xfs_trans_alloc+0xcf/0x990 fs/xfs/xfs_trans.c:258
locks held by syz.4.163/6808: 1, on CPU#0:
#0: ffff88802c4c0478 (sb_writers#29){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2762 [inline]
#0: ffff88802c4c0478 (sb_writers#29){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
locks held by syz.4.163/6809: 3, on CPU#0:
#0: ffff88802c4c0478 (sb_writers#29){.+.+}-{0:0}
, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
#1: ffff888054c16150 (&sb->s_type->i_mutex_key#41){++++}-{4:4}, at: inode_lock include/linux/fs.h:1026 [inline]
#1: ffff888054c16150 (&sb->s_type->i_mutex_key#41){++++}-{4:4}, at: vfs_setxattr+0x12b/0x370 fs/xattr.c:343
#2: ffff88802c4c0668 (sb_internal#5){.+.+}-{0:0}, at: xfs_trans_alloc+0xcf/0x990 fs/xfs/xfs_trans.c:258
locks held by syz.6.185/6887: 2, on CPU#1:
#0: ffff88802c4c0100 (&type->s_umount_key#75){++++}-{4:4}, at: __super_lock fs/super.c:62 [inline]
#0: ffff88802c4c0100 (&type->s_umount_key#75){++++}-{4:4}, at: super_lock+0x2d4/0x3d0 fs/super.c:124
#1: ffff888027510870 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:397 [inline]
#1: ffff888027510870 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x20e/0xbf0 fs/fs-writeback.c:3070
locks held by syz-executor/7134: 2, last CPU#0:
#0: ffff8880684ba478 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
#1: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
locks held by syz-executor/7355: 1, last CPU#0:
#0: ffff88802e176ce0 (&xt[i].mutex){+.+.}-{4:4}, at: xt_find_table_lock+0x55/0x400 net/netfilter/x_tables.c:1336
locks held by syz.5.459/8520: 2, on CPU#0:
#0: ffff88802c4c0100 (&type->s_umount_key#75){++++}-{4:4}, at: __super_lock fs/super.c:62 [inline]
#0: ffff88802c4c0100 (&type->s_umount_key#75){++++}-{4:4}, at: super_lock+0x2d4/0x3d0 fs/super.c:124
#1: ffff888027510870 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:397 [inline]
#1: ffff888027510870 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x20e/0xbf0 fs/fs-writeback.c:3070
locks held by syz.1.474/8610: 2, last CPU#0:
#0: ffff8880684ba478 (sb_writers#5){.+.+}-{0:0}, at: vfs_coredump+0xac3/0x10c0 fs/coredump.c:1312
#1: ffff888054517038 (&sb->s_type->i_mutex_key#15){++++}-{4:4}, at: inode_lock include/linux/fs.h:1026 [inline]
#1: ffff888054517038 (&sb->s_type->i_mutex_key#15){++++}-{4:4}, at: shmem_file_write_iter+0x7f/0x120 mm/shmem.c:3691
locks held by syz-executor/8754: 4, last CPU#0:
#0: ffffffff91689ce8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x51f/0x770 net/core/net_namespace.c:580
#1: ffffffff913ea3e8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x1fb/0x2f0 drivers/infiniband/core/device.c:1221
#2: ffffffff913ea5a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x233/0x2f0 drivers/infiniband/core/device.c:1226
#3: ffff88807f939020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0xf0/0x640 drivers/infiniband/core/device.c:976
locks held by syz.9.514/8784: 1, last CPU#0:
#0: ffff88807be9e478 (sb_writers#5){.+.+}-{0:0}, at: vfs_coredump+0xac3/0x10c0 fs/coredump.c:1312
locks held by syz.9.519/8807: 3, last CPU#0:
#0: ffff88807a9f01b0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_init_dev+0x74/0x4d0 drivers/tty/tty_io.c:1381
#1: ffff8880367682a8 (&port->mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#1: ffff8880367682a8 (&port->mutex){+.+.}-{4:4}, at: tty_port_open+0x12d/0x2d0 drivers/tty/tty_port.c:793
#2: ffff88802a81f518 (&serial->disc_mutex){+.+.}-{4:4}, at: serial_port_activate+0x56/0x250 drivers/usb/serial/usb-serial.c:258
locks held by syz.3.521/8812: 1, on CPU#0:
#0: ffff88802b03d1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1109 [inline]
#0: ffff88802b03d1d8 (&dev->mutex){....}-{4:4}, at: usbdev_do_ioctl drivers/usb/core/devio.c:2613 [inline]
#0: ffff88802b03d1d8 (&dev->mutex){....}-{4:4}, at: usbdev_ioctl+0x13f/0x21a0 drivers/usb/core/devio.c:2829
locks held by udevd/8814: 4, on CPU#1:
#0: ffff8880354452d8 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xa4/0xca0 fs/seq_file.c:183
#1: ffff888056dd5880 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5d/0x420 fs/kernfs/file.c:165
#2: ffff888056711968 (kn->active#30){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
#2: ffff888056711968 (kn->active#30){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420 fs/kernfs/file.c:166
#3: ffff8880276881d8 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:1114 [inline]
#3: ffff8880276881d8 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
locks held by udevd/8815: 1, last CPU#0:
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
#0: ffffffff9015a560 (rcu_read_lock){....}-{1:3}, at: kernfs_dop_revalidate+0xba/0x590 fs/kernfs/dir.c:1211
locks held by dhcpcd-run-hook/8817: 4, last CPU#0:
#0: ffffffff9023b770 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1538 [inline]
#0: ffffffff9023b770 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0xf6/0x640 kernel/fork.c:1604
#1: ffff88802b1ef180 (&mm->mmap_lock){++++}-{4:4}
, at: mmap_write_lock_killable include/linux/mmap_lock.h:566 [inline]
, at: dup_mm kernel/fork.c:1539 [inline]
, at: copy_mm+0x110/0x640 kernel/fork.c:1604
#2: ffff88802cc90f80 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:556 [inline]
#2: ffff88802cc90f80 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1f6/0x1c80 mm/mmap.c:1722
#3: ffff8880b823c5e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb2/0x160 kernel/sched/core.c:685
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]
watchdog+0x1073/0x10f0 kernel/hung_task.c:598
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: pr/ttyS0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:425
Code: e8 3e e4 3f fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 2f ae b9 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 ca 39 85 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90000aa78b8 EFLAGS: 00000002
RAX: 1ffffffff3843d00 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff85894f90 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff9c21ef80 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881234f0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12016f3ff8 CR3: 0000000035ce2000 CR4: 00000000003526f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:134 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:156 [inline]
wait_for_lsr+0x184/0x2f0 drivers/tty/serial/8250/8250_port.c:2036
serial8250_fifo_wait_for_lsr_thre drivers/tty/serial/8250/8250_port.c:3294 [inline]
__serial8250_console_fifo_write+0xcd/0x3e0 drivers/tty/serial/8250/8250_port.c:3369
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3402 [inline]
__serial8250_console_write drivers/tty/serial/8250/8250_port.c:3456 [inline]
serial8250_console_write+0xa7e/0x1200 drivers/tty/serial/8250/8250_port.c:3520
nbcon_emit_next_record+0xef5/0x1a90 kernel/printk/nbcon.c:-1
nbcon_emit_one kernel/printk/nbcon.c:1157 [inline]
nbcon_kthread_func+0x6d9/0x8d0 kernel/printk/nbcon.c:1271
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245