INFO: task syz-executor.0:4401 blocked for more than 143 seconds.
Not tainted 5.15.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D
stack:20504 pid: 4401 ppid: 1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5027 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
schedule+0x11b/0x1f0 kernel/sched/core.c:6456
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: 0033:0x7fdd91022c07
RSP: 002b:00007ffc3e0c9e58 EFLAGS: 00000246
ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fdd91022c07
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc3e0c9f10
RBP: 00007ffc3e0c9f10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc3e0cafd0
R13: 00007fdd9107caf2 R14: 00000000000149d4 R15: 0000000000000003
Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
#0:
ffff8881447dc938
((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90000ce7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
#2: ffff88802be30650 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x20f/0x1180 fs/xfs/libxfs/xfs_bmap.c:4573
#3: ffff888074fb80e8
(&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x23c/0x1180 fs/xfs/libxfs/xfs_bmap.c:4578
1 lock held by khungtaskd/27:
#0: ffffffff8cb1fce0
(
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3927:
#0:
ffff88814d0f5098
(
&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-executor.0/4401:
#0:
ffff88802be300e0
(
&type->s_umount_key
#51
){+.+.}-{3:3}
, at: deactivate_super+0xa9/0xe0 fs/super.c:365
#1:
ffff888020a767d8
(
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x274/0xab0 fs/fs-writeback.c:2768
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.178-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:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4183 Comm: kworker/1:3 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: xfs-buf/loop0 xfs_buf_ioend_work
RIP: 0010:__lock_acquire+0xe2c/0x1ff0 kernel/locking/lockdep.c:5002
Code: 24 2c 01 00 00 00 49 c7 c7 ff ff ff ff 4c 89 74 24 60 48 8b 44 24 38 0f b6 04 38 84 c0 0f 85 03 0b 00 00 48 8b 44 24 20 8b 28 <48> 83 bc 24 c0 00 00 00 00 0f 84 9c 00 00 00 48 8b 44 24 40 0f b6
RSP: 0018:ffffc90000dd09a0 EFLAGS: 00000046
RAX: ffff88802b230b60 RBX: 0000000000062953 RCX: ffff88802b230af0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: 00000000000220e4 R08: dffffc0000000000 R09: fffffbfff2131824
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002
R13: ffff88802b230ae8 R14: 1ffff1100564615c R15: ffffffffffffffff
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd755426c0 CR3: 000000002acab000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x19/0x20 include/linux/rcupdate.h:312
rcu_do_batch kernel/rcu/tree.c:2518 [inline]
rcu_core+0x9d1/0x1650 kernel/rcu/tree.c:2763
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 a4 16 1a 00 fb 31 db eb 48 e8 9a 16 1a 00 e8 65 e0 d8 08 4d 85 ed 74 cd e8 8b 16 1a 00 fb bb 01 00 00 00 <48> c7 c7 a0 c5 9f 8c 31 f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00
RSP: 0018:ffffc900031bf7c0 EFLAGS: 00000293
RAX: ffffffff81666f05 RBX: 0000000000000001 RCX: ffff88802b230000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900031bf890 R08: ffffffff81666ebe R09: fffffbfff2131847
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000637ef8
R13: 0000000000000200 R14: 0000000000000046 R15: dffffc0000000000
vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273
_printk+0xd1/0x120 kernel/printk/printk.c:2299
print_hex_dump+0x1a2/0x250 lib/hexdump.c:285
xfs_hex_dump+0x39/0x50 fs/xfs/xfs_message.c:118
xfs_buf_verifier_error+0x1bc/0x290 fs/xfs/xfs_error.c:418
xfs_allocbt_read_verify+0x52/0xc0
xfs_buf_ioend+0x26a/0x6e0 fs/xfs/xfs_buf.c:1263
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