INFO: task kworker/u8:5:1094 blocked for more than 144 seconds.
Not tainted 6.13.0-rc6-next-20250107-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5 state:D stack:19960 pid:1094 tgid:1094 ppid:2 flags:0x00004000
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x18f6/0x4cd0 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
bit_wait+0x12/0xd0 kernel/sched/wait_bit.c:237
__wait_on_bit+0xb0/0x2f0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x1d5/0x260 kernel/sched/wait_bit.c:64
wait_on_bit include/linux/wait_bit.h:77 [inline]
netfs_retry_writes+0x16e/0x19b0 fs/netfs/write_retry.c:215
netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
netfs_write_collection_worker+0x2f90/0x3bb0 fs/netfs/write_collect.c:374
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz.2.172:6839 blocked for more than 145 seconds.
Not tainted 6.13.0-rc6-next-20250107-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.172 state:D stack:23536 pid:6839 tgid:6838 ppid:5830 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x18f6/0x4cd0 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
netfs_writepages+0x12b/0x9e0 fs/netfs/write_issue.c:564
do_writepages+0x35f/0x880 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
__filemap_fdatawrite mm/filemap.c:428 [inline]
filemap_fdatawrite+0x1f3/0x2a0 mm/filemap.c:433
v9fs_dir_release+0x151/0x560 fs/9p/vfs_dir.c:219
__fput+0x3e9/0x9f0 fs/file_table.c:450
task_work_run+0x24f/0x310 kernel/task_work.c:227
get_signal+0x15f7/0x1750 kernel/signal.c:2790
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff09e185d29
RSP: 002b:00007ff09f06f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: 0000000000240000 RBX: 00007ff09e375fa0 RCX: 00007ff09e185d29
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000008
RBP: 00007ff09e201b08 R08: 0000000000000000 R09: 0000000000000000
R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff09e375fa0 R15: 00007fff8f275618
INFO: task syz.2.172:6843 blocked for more than 145 seconds.
Not tainted 6.13.0-rc6-next-20250107-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.172 state:D stack:26712 pid:6843 tgid:6838 ppid:5830 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x18f6/0x4cd0 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
netfs_writepages+0x12b/0x9e0 fs/netfs/write_issue.c:564
do_writepages+0x35f/0x880 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
__filemap_fdatawrite mm/filemap.c:428 [inline]
filemap_fdatawrite+0x1f3/0x2a0 mm/filemap.c:433
v9fs_vfs_setattr+0x7e5/0xe20 fs/9p/vfs_inode.c:1072
notify_change+0xbca/0xe90 fs/attr.c:552
vfs_utimes+0x4b5/0x770 fs/utimes.c:66
do_utimes_path fs/utimes.c:99 [inline]
do_utimes fs/utimes.c:140 [inline]
do_futimesat fs/utimes.c:194 [inline]
__do_sys_utimes fs/utimes.c:207 [inline]
__se_sys_utimes+0x194/0x380 fs/utimes.c:204
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff09e185d29
RSP: 002b:00007ff09f02d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000eb
RAX: ffffffffffffffda RBX: 00007ff09e376160 RCX: 00007ff09e185d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007ff09e201b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007ff09e376160 R15: 00007fff8f275618
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by kworker/u8:5/1094:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
#1: ffffc90003cafc60 ((work_completion)(&rreq->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90003cafc60 ((work_completion)(&rreq->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
2 locks held by getty/5583:
#0: ffff8880315e40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5841:
#0: ffff8880676220e0 (&type->s_umount_key#97){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880676220e0 (&type->s_umount_key#97){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880676220e0 (&type->s_umount_key#97){+.+.}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffffffff8e93d280 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3741
1 lock held by syz.2.172/6839:
#0: ffff88807a8f8500 (&ctx->wb_lock){+.+.}-{4:4}, at: netfs_writepages+0x12b/0x9e0 fs/netfs/write_issue.c:564
1 lock held by syz.2.172/6842:
#0: ffff88807a8f8500 (&ctx->wb_lock){+.+.}-{4:4}, at: netfs_writepages+0xcf/0x9e0 fs/netfs/write_issue.c:558
3 locks held by syz.2.172/6843:
#0: ffff8880312a8420 (sb_writers#29){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:547
#1: ffff88807a8f8148 (&sb->s_type->i_mutex_key#34){++++}-{4:4}, at: inode_lock include/linux/fs.h:865 [inline]
#1: ffff88807a8f8148 (&sb->s_type->i_mutex_key#34){++++}-{4:4}, at: vfs_utimes+0x44d/0x770 fs/utimes.c:65
#2: ffff88807a8f8500 (&ctx->wb_lock){+.+.}-{4:4}, at: netfs_writepages+0x12b/0x9e0 fs/netfs/write_issue.c:564
2 locks held by kworker/u8:14/8209:
1 lock held by syz.0.659/8601:
#0: ffffffff8e93d280 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3741
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc6-next-20250107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xff6/0x1040 kernel/hung_task.c:397
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5818 Comm: syz-executor Not tainted 6.13.0-rc6-next-20250107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:mark_lock+0xa/0x360 kernel/locking/lockdep.c:4712
Code: 57 0a 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 <48> 83 ec 10 49 89 f7 48 89 3c 24 49 bd 00 00 00 00 00 fc ff df 83
RSP: 0018:ffffc900000073b8 EFLAGS: 00000046
RAX: 0000000000000002 RBX: ffffffff93c57196 RCX: 0000000000000002
RDX: 0000000000000008 RSI: ffff88807e6cc768 RDI: ffff88807e6cbc00
RBP: ffff88807e6cc768 R08: ffffffff942db84f R09: 1ffffffff285b709
R10: dffffc0000000000 R11: fffffbfff285b70a R12: ffff88807e6cc6d4
R13: ffff88807e6cbc00 R14: 0000000000000003 R15: ffff88807e6cc788
FS: 00005555857d1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe179348178 CR3: 00000000287d4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
mark_usage kernel/locking/lockdep.c:4672 [inline]
__lock_acquire+0xc3e/0x2100 kernel/locking/lockdep.c:5182
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
is_bpf_text_address+0x46/0x2a0 kernel/bpf/core.c:772
kernel_text_address+0xa7/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfd/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xaa/0xc0 mm/kasan/generic.c:548
insert_work+0x3e/0x330 kernel/workqueue.c:2183
__queue_work+0xb66/0xf50 kernel/workqueue.c:2343
call_timer_fn+0x187/0x650 kernel/time/timer.c:1793
expire_timers kernel/time/timer.c:1839 [inline]
__run_timers kernel/time/timer.c:2418 [inline]
__run_timer_base+0x695/0x8e0 kernel/time/timer.c:2430
run_timer_base kernel/time/timer.c:2439 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449
handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__free_object+0x59a/0x760 lib/debugobjects.c:524
Code: 60 42 80 3c 2b 00 74 08 4c 89 f7 e8 10 e0 38 fd f6 44 24 61 02 75 54 41 f7 c4 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc9000405fb20 EFLAGS: 00000206
RAX: 0eeeb9d00b765700 RBX: 1ffff9200080bf70 RCX: ffffffff9a3e2903
RDX: dffffc0000000000 RSI: ffffffff8c0a9b40 RDI: ffffffff8c600460
RBP: ffffc9000405fc10 R08: ffffffff901ac9f7 R09: 1ffffffff203593e
R10: dffffc0000000000 R11: fffffbfff203593f R12: 0000000000000246
R13: dffffc0000000000 R14: ffffc9000405fb80 R15: 1ffff9200080bf6c
free_object lib/debugobjects.c:532 [inline]
debug_object_free+0x3a6/0x460 lib/debugobjects.c:976
destroy_hrtimer_on_stack kernel/time/hrtimer.c:438 [inline]
hrtimer_nanosleep+0x350/0x410 kernel/time/hrtimer.c:2141
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline]
__se_sys_clock_nanosleep+0x32b/0x3c0 kernel/time/posix-timers.c:1379
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00f89b85a3
Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 9e 3f 19 00 00 74 14 b8 e6 00 00 00 0f 05 d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007ffee8265cb8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f00f89b85a3
RDX: 00007ffee8265cd0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000000002af20570 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffee8266120
R13: 0000000000000004 R14: 00007ffee8265d0c R15: 00007ffee8265da0