INFO: task syz-executor379:4163 blocked for more than 143 seconds.
Not tainted 5.15.179-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor379 state:D stack:25176 pid: 4163 ppid: 4161 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
schedule+0x11b/0x1f0 kernel/sched/core.c:6458
wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191
sync_inodes_sb+0x293/0xab0 fs/fs-writeback.c:2770
sync_filesystem+0x16b/0x220 fs/sync.c:64
generic_shutdown_super+0x6b/0x310 fs/super.c:448
kill_block_super+0x7a/0xe0 fs/super.c:1427
deactivate_locked_super+0xa0/0x110 fs/super.c:335
cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
task_work_run+0x129/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb5fe15d407
RSP: 002b:00007ffc628114e8 EFLAGS: 00000206
ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fb5fe15d407
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc628115a0
RBP: 00007ffc628115a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc62812610
R13: 0000555555f126c0 R14: 0000000000000001 R15: 431bde82d7b634db
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0:
ffffffff8cb1f4e0
(
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire+0x0/0x30
5 locks held by kworker/u4:2/154:
#0:
ffff8881427f0938
(
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1:
ffffc90002047d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}
, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
#2:
ffff888075e6a650
(
sb_internal
#2
){.+.+}-{0:0}
, at: xfs_bmapi_convert_delalloc+0x20f/0x1180 fs/xfs/libxfs/xfs_bmap.c:4573
#3:
ffff888071f99768
(
&xfs_nondir_ilock_class
){++++}-{3:3}
, at: xfs_bmapi_convert_delalloc+0x23c/0x1180 fs/xfs/libxfs/xfs_bmap.c:4578
#4:
ffffffff96dbc9b8
(
&port_lock_key
){-.-.}-{2:2}
, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
5 locks held by kworker/0:3/1325:
2 locks held by getty/3933:
#0:
ffff88802c388098
(
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900025c62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
2 locks held by syz-executor379/4163:
#0:
ffff888075e6a0e0
(
&type->s_umount_key
#43
){+.+.}-{3:3}
, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1:
ffff8881475ac7d8
(
&bdi->wb_switch_rwsem
){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
){+.+.}-{3:3}, at: sync_inodes_sb+0x274/0xab0 fs/fs-writeback.c:2768
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:369
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 154 Comm: kworker/u4:2 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:kasan_check_range+0x1ac/0x290 mm/kasan/generic.c:189
Code: 4c 89 d5 48 8d 5d 07 48 85 ed 48 0f 49 dd 48 83 e3 f8 48 29 dd 74 12 41 80 39 00 0f 85 a2 00 00 00 49 ff c1 48 ff cd 75 ee 5b <41> 5e 41 5f 5d c3 45 84 f6 75 61 41 f7 c6 00 ff 00 00 75 5d 41 f7
RSP: 0018:ffffc900000074a0 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 000000000000009d RCX: ffffffff81639d52
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9098f0d0
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff2131e1b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88801c604708 R14: fffffbfff2131e1b R15: ffff88801c604708
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d99bfde600 CR3: 000000007dc9b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read include/linux/instrumented.h:71 [inline]
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
hlock_class kernel/locking/lockdep.c:197 [inline]
lookup_chain_cache_add kernel/locking/lockdep.c:3700 [inline]
validate_chain+0x112/0x5930 kernel/locking/lockdep.c:3756
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x12c0 kernel/sched/core.c:4029
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:console_trylock_spinning+0x36b/0x3f0 kernel/printk/printk.c:1909
Code: 0f 84 75 ff ff ff e8 14 1a 1a 00 fb 31 db eb 48 e8 0a 1a 1a 00 e8 95 7c d9 08 4d 85 ed 74 cd e8 fb 19 1a 00 fb bb 01 00 00 00 <48> c7 c7 a0 bd 9f 8c 31 f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00
RSP: 0018:ffffc90002046a60 EFLAGS: 00000293
RAX: ffffffff816682c5 RBX: 0000000000000001 RCX: ffff88801c603b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002046b30 R08: ffffffff8166827e R09: fffffbfff2131e30
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000408d4c
R13: 0000000000000200 R14: 0000000000000046 R15: dffffc0000000000
vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273
_printk+0xd1/0x120 kernel/printk/printk.c:2299
__xfs_printk fs/xfs/xfs_message.c:24 [inline]
xfs_alert+0x1c8/0x320 fs/xfs/xfs_message.c:52
xfs_discard_page+0x1a5/0x470 fs/xfs/xfs_aops.c:455
iomap_writepage_map fs/iomap/buffered-io.c:1351 [inline]
iomap_do_writepage+0x1ce1/0x21c0 fs/iomap/buffered-io.c:1485
write_cache_pages+0xa97/0x1160 mm/page-writeback.c:2277
iomap_writepages+0x64/0x240 fs/iomap/buffered-io.c:1516
xfs_vm_writepages+0x127/0x180 fs/xfs/xfs_aops.c:488
do_writepages+0x481/0x730 mm/page-writeback.c:2386
__writeback_single_inode+0x15b/0xe30 fs/fs-writeback.c:1647
writeback_sb_inodes+0xbce/0x1a40 fs/fs-writeback.c:1930
wb_writeback+0x451/0xc50 fs/fs-writeback.c:2104
wb_do_writeback fs/fs-writeback.c:2247 [inline]
wb_workfn+0x46c/0x1130 fs/fs-writeback.c:2288
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.570 msecs