INFO: task kworker/u8:13:3539 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:13 state:D stack:22784 pid:3539 tgid:3539 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-7:8)
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14fb/0x52c0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
io_schedule+0x80/0xe0 kernel/sched/core.c:7831
TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:125 [inline]
txBegin+0x27d/0xc00 fs/jfs/jfs_txnmgr.c:375
jfs_commit_inode+0x1b3/0x530 fs/jfs/inode.c:107
jfs_write_inode+0x145/0x220 fs/jfs/inode.c:138
write_inode fs/fs-writeback.c:1581 [inline]
__writeback_single_inode+0x75d/0x11a0 fs/fs-writeback.c:1812
writeback_sb_inodes+0x944/0x1970 fs/fs-writeback.c:2040
wb_writeback+0x456/0xb70 fs/fs-writeback.c:2226
wb_do_writeback fs/fs-writeback.c:2373 [inline]
wb_workfn+0x41a/0xf60 fs/fs-writeback.c:2413
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz-executor:6937 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22496 pid:6937 tgid:6937 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14fb/0x52c0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
wb_wait_for_completion+0x372/0x690 fs/fs-writeback.c:226
__writeback_inodes_sb_nr+0x24c/0x2d0 fs/fs-writeback.c:2837
sync_filesystem+0xa2/0x250 fs/sync.c:54
generic_shutdown_super+0x77/0x2d0 fs/super.c:625
kill_block_super+0x44/0x90 fs/super.c:1725
deactivate_locked_super+0xbc/0x130 fs/super.c:476
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ca98dd897
RSP: 002b:00007ffc0d488cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f3ca9971ef0 RCX: 00007f3ca98dd897
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc0d488d80
RBP: 00007ffc0d488d80 R08: 00007ffc0d489d80 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc0d489e10
R13: 00007f3ca9971ef0 R14: 00000000000454c2 R15: 00007ffc0d489e50
Showing all locks held in the system:
1 lock held by khungtaskd/37:
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8ddcd780 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:13/3539:
#0: ffff88801aedc938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3250 [inline]
#0: ffff88801aedc938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830 kernel/workqueue.c:3358
#1: ffffc9000eea7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
#1: ffffc9000eea7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830 kernel/workqueue.c:3358
2 locks held by getty/5551:
#0: ffff8880288520a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by udevd/5856:
1 lock held by syz-executor/6937:
#0: ffff88803c9e40d0 (&type->s_umount_key#90){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803c9e40d0 (&type->s_umount_key#90){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88803c9e40d0 (&type->s_umount_key#90){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
1 lock held by udevd/8195:
2 locks held by syz-executor/9765:
1 lock held by syz.9.642/9922:
#0: ffff88803c9e40d0 (&type->s_umount_key#90){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88803c9e40d0 (&type->s_umount_key#90){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
2 locks held by syz.0.925/11809:
2 locks held by syz.4.921/11811:
9 locks held by syz.6.928/11823:
5 locks held by dhcpcd-run-hook/11825:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11825 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:222 [inline]
RIP: 0010:unwind_next_frame+0x1f5/0x23c0 arch/x86/kernel/unwind_orc.c:510
Code: fc 48 63 26 8b 0f 93 c1 08 c1 0f 85 05 01 00 00 48 c7 c0 00 00 00 81 4d 89 e7 49 29 c7 49 c1 ef 08 8b 15 9e 71 09 0c 8d 42 ff <44> 39 f8 0f 86 78 04 00 00 44 89 f8 4c 8d 2c 85 d4 07 9b 90 4c 89
RSP: 0018:ffffc900040d6fb8 EFLAGS: 00000203
RAX: 00000000000a2664 RBX: 0000000000000001 RCX: 0000000080000000
RDX: 00000000000a2665 RSI: ffffffff8ba64460 RDI: ffffffff8ba64420
RBP: dffffc0000000000 R08: ffffffff81766a15 R09: ffffffff8ddcd780
R10: ffffc900040d70d8 R11: ffffffff81af6870 R12: ffffffff821476ef
R13: ffffc900040d70d8 R14: ffffc900040d7088 R15: 0000000000011476
FS: 0000000000000000(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92217be286 CR3: 0000000059f86000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
slab_free_hook mm/slub.c:2648 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x4fb/0x6b0 mm/slub.c:6254
anon_vma_free mm/rmap.c:137 [inline]
__put_anon_vma+0x12a/0x310 mm/rmap.c:2889
put_anon_vma mm/internal.h:215 [inline]
unlink_anon_vmas+0x58b/0x730 mm/rmap.c:529
free_pgtables+0x836/0xb70 mm/memory.c:427
exit_mmap+0x490/0xa10 mm/mmap.c:1314
__mmput+0xcb/0x3d0 kernel/fork.c:1174
exec_mmap+0x3b2/0x440 fs/exec.c:893
begin_new_exec+0x1350/0x24b0 fs/exec.c:1148
load_elf_binary+0xa50/0x29b0 fs/binfmt_elf.c:1010
search_binary_handler fs/exec.c:1664 [inline]
exec_binprm fs/exec.c:1696 [inline]
bprm_execve+0x93d/0x1460 fs/exec.c:1748
do_execveat_common+0x50d/0x690 fs/exec.c:1846
__do_sys_execve fs/exec.c:1930 [inline]
__se_sys_execve fs/exec.c:1924 [inline]
__x64_sys_execve+0x97/0xc0 fs/exec.c:1924
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9221704107
Code: Unable to access opcode bytes at 0x7f92217040dd.
RSP: 002b:00007fffb7e4a748 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00005598148c2078 RCX: 00007f9221704107
RDX: 00005598148c20a0 RSI: 00005598148c2078 RDI: 00005598148c2130
RBP: 00005598148c2130 R08: 00007fffb7e4fe75 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 00005598148c20a0
R13: 00007f92218c9e8b R14: 00005598148c20a0 R15: 0000000000000000