INFO: task syz-executor:4274 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22384 pid:4274 ppid:1 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
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x288/0x360 fs/jfs/jfs_umount.c:116
jfs_put_super+0x88/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1481
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x471/0x4f0 fs/namespace.c:1191
task_work_run+0x1d0/0x260 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
__syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f296c19f397
RSP: 002b:00007fff03c22588 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f296c2344bb RCX: 00007f296c19f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff03c22640
RBP: 00007fff03c22640 R08: 00007fff03c23640 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff03c236d0
R13: 00007f296c2344bb R14: 0000000000031146 R15: 00007fff03c23710
INFO: task syz-executor:4275 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21584 pid:4275 ppid:1 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
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x288/0x360 fs/jfs/jfs_umount.c:116
jfs_put_super+0x88/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1481
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x471/0x4f0 fs/namespace.c:1191
task_work_run+0x1d0/0x260 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
__syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4d1e39f397
RSP: 002b:00007fff5b9fd418 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4d1e4344bb RCX: 00007f4d1e39f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff5b9fd4d0
RBP: 00007fff5b9fd4d0 R08: 00007fff5b9fe4d0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff5b9fe560
R13: 00007f4d1e4344bb R14: 000000000002fb2b R15: 00007fff5b9fe5a0
INFO: task syz-executor:5014 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22384 pid:5014 ppid:1 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
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x288/0x360 fs/jfs/jfs_umount.c:116
jfs_put_super+0x88/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x130/0x340 fs/super.c:501
kill_block_super+0x7c/0xe0 fs/super.c:1481
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x471/0x4f0 fs/namespace.c:1191
task_work_run+0x1d0/0x260 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
__syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f78a039f397
RSP: 002b:00007ffef0798728 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f78a04344bb RCX: 00007f78a039f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffef07987e0
RBP: 00007ffef07987e0 R08: 00007ffef07997e0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffef0799870
R13: 00007f78a04344bb R14: 000000000002d93d R15: 00007ffef07998b0
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/28:
#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 getty/4028:
#0: ffff88803016a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
2 locks held by syz-executor/4274:
#0: ffff888079fca0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/4275:
#0: ffff88802f23a0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/4281:
#0: ffff88807e34a0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/4930:
#0: ffff88805cadc0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/5014:
#0: ffff88802f10c0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/5739:
#0: ffff888034ce80e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by kworker/u4:18/5757:
2 locks held by syz-executor/5877:
#0: ffff88803687a0e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/5941:
#0: ffff8880847720e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffffffff8cf2df88 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444
1 lock held by rm/7441:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4625 Comm: kworker/u4:14 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x68/0x290 mm/kasan/generic.c:189
Code: 89 fe 49 c1 ee 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 4b 8d 1c 21 49 89 df 4d 29 df <49> 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c
RSP: 0018:ffffc90004e7f730 EFLAGS: 00000012
RAX: 0000000000000001 RBX: fffff520009cff00 RCX: ffffffff8416e684
RDX: 0000000000000001 RSI: 0000000000000040 RDI: ffffc90004e7f7c0
RBP: 0000000000000000 R08: ffffc90004e7f7ff R09: 1ffff920009cfeff
R10: dffffc0000000000 R11: fffff520009cfef8 R12: dffffc0000000001
R13: ffffc90004e7f918 R14: 1ffff920009cfef8 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec9b6897e8 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
memset+0x1e/0x40 mm/kasan/shadow.c:44
memzero_explicit include/linux/string.h:290 [inline]
chacha_block_generic+0x5d4/0xd80 lib/crypto/chacha.c:90
chacha20_block include/crypto/chacha.h:36 [inline]
crng_fast_key_erasure drivers/char/random.c:259 [inline]
crng_make_state+0x3b2/0xb00 drivers/char/random.c:352
_get_random_bytes+0xfc/0x250 drivers/char/random.c:366
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:776 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x608/0xa80 drivers/net/netdevsim/dev.c:851
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