INFO: task syz-executor:5087 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:21624 pid: 5087 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 wb_wait_for_completion+0x171/0x290 fs/fs-writeback.c:191
 sync_inodes_sb+0x1bd/0x950 fs/fs-writeback.c:2787
 sync_filesystem+0x16d/0x220 fs/sync.c:64
 generic_shutdown_super+0x6b/0x300 fs/super.c:448
 kill_block_super+0x7c/0xe0 fs/super.c:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x42d/0x4e0 fs/namespace.c:1148
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f62ca3beb57
RSP: 002b:00007fff98929d48 EFLAGS: 00000246
 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f62ca44e64a RCX: 00007f62ca3beb57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff98929e00
RBP: 00007fff98929e00 R08: 00007fff9892ae00 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9892ae90
R13: 00007f62ca44e64a R14: 0000000000019730 R15: 00007fff9892aed0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c31eb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
4 locks held by kworker/u4:2/154:
 #0: 
ffff8881431ff138 ((wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: 
ffffc90001fb7d00 ((work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: 
ffff888059078650
 (
sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x224/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4573
 #3: ffff8880701d3568 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x25b/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4578
4 locks held by kworker/u4:3/1205:
 #0: 
ffff8881431ff138
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: 
ffffc900049d7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: 
ffff88802b756650
 (
sb_internal
#2
){.+.+}-{0:0}
, at: xfs_bmapi_convert_delalloc+0x224/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4573
 #3: 
ffff8880700400e8
 (
&xfs_nondir_ilock_class
){++++}-{3:3}
, at: xfs_bmapi_convert_delalloc+0x25b/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4578
4 locks held by kworker/u4:4/1252:
 #0: 
ffff8881431ff138
 (
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90004cc7d00
 (
(work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: ffff88802b792650 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x224/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4573
 #3: ffff888070043568 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x25b/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4578
4 locks held by kworker/u4:5/1289:
 #0: ffff8881431ff138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: ffffc90004f07d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
 #2: 
ffff888059912650
 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x224/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4573
 #3: 
ffff88805ffa9768 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x25b/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4578
2 locks held by getty/3949:
 #0: 
ffff88814d1bb098
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: 
ffffc90002cf62e8
 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
5 locks held by kworker/0:9/4306:
2 locks held by syz-executor/5087:
 #0: 
ffff88802b7560e0
 (
&type->s_umount_key
#54
){+.+.}-{3:3}
, at: deactivate_super+0xa0/0xd0 fs/super.c:365
 #1: 
ffff8881475507d8
 (&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x1a1/0x950 fs/fs-writeback.c:2785
2 locks held by kworker/1:24/5154:
 #0: 
ffff888016c72138
 (
(wq_completion)rcu_gp
){+.+.}-{0:0}
, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
 #1: 
ffffc9000324fd00
 (
(work_completion)(&rew.rew_work)
){+.+.}-{0:0}
, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
2 locks held by syz-executor/5255:
 #0: 
ffff88802b7920e0
 (
&type->s_umount_key
#54
){+.+.}-{3:3}
, at: deactivate_super+0xa0/0xd0 fs/super.c:365
 #1: 
ffff8881475567d8
 (
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x1a1/0x950 fs/fs-writeback.c:2785
2 locks held by syz-executor/5292:
 #0: 
ffff8880590780e0
 (
&type->s_umount_key
#54
){+.+.}-{3:3}
, at: deactivate_super+0xa0/0xd0 fs/super.c:365
 #1: 
ffff8881475647d8
 (
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x1a1/0x950 fs/fs-writeback.c:2785
2 locks held by syz-executor/5324:
 #0: 
ffff8880599120e0
 (
&type->s_umount_key
#54
){+.+.}-{3:3}
, at: deactivate_super+0xa0/0xd0 fs/super.c:365
 #1: 
ffff88814756a7d8
 (
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x1a1/0x950 fs/fs-writeback.c:2785
2 locks held by syz-executor/5417:
 #0: 
ffff8880242ae0e0
 (
&type->s_umount_key
#54
){+.+.}-{3:3}
, at: deactivate_super+0xa0/0xd0 fs/super.c:365
 #1: 
ffffffff8c3235a8
 (
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 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+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4304 Comm: kworker/0:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: xfs-buf/loop2 xfs_buf_ioend_work
RIP: 0010:__hlist_del include/linux/list.h:-1 [inline]
RIP: 0010:detach_timer+0xcc/0x2b0 kernel/time/timer.c:827
Code: fc 00 00 00 e8 85 9d 10 00 eb 05 e8 7e 9d 10 00 4c 89 eb 48 c1 eb 03 42 80 3c 23 00 74 08 4c 89 ef e8 38 bc 55 00 4d 8b 7d 00 <4c> 89 6c 24 08 49 83 c5 08 4d 89 ee 49 c1 ee 03 4c 89 e5 43 80 3c
RSP: 0018:ffffc90000007c58 EFLAGS: 00000046
RAX: ffffffff8168970b RBX: 1ffff11028ea0409 RCX: ffff888022d48000
RDX: 0000000000000100 RSI: ffffffff8a79fde0 RDI: ffffffff8a79fda0
RBP: ffffc90000007df0 R08: ffffffff8d89f02f R09: 1ffffffff1b13e05
R10: dffffc0000000000 R11: fffffbfff1b13e06 R12: dffffc0000000000
R13: ffff888147502048 R14: 0000000000000000 R15: ffff888075c466f8
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f852e5da000 CR3: 000000002a9f7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 expire_timers kernel/time/timer.c:1682 [inline]
 __run_timers+0x4c0/0x800 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x339/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:console_trylock_spinning+0x301/0x370 kernel/printk/printk.c:1909
Code: 85 db 74 89 e8 f0 e9 18 00 fb 31 c0 eb 48 e8 e6 e9 18 00 e8 01 7f 5c 08 48 85 db 74 d1 e8 d7 e9 18 00 fb 48 c7 c7 60 36 31 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 68 ba 4a 60
RSP: 0018:ffffc9000311f7c0 EFLAGS: 00000293
RAX: ffffffff81604ab9 RBX: 0000000000000200 RCX: ffff888022d48000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c313660
RBP: ffffc9000311f890 R08: ffffffff901d5207 R09: 1ffffffff203aa40
R10: dffffc0000000000 R11: fffffbfff203aa41 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff92000623ef8
 vprintk_emit+0xa7/0x150 kernel/printk/printk.c:2273
 _printk+0xda/0x130 kernel/printk/printk.c:2299
 __xfs_printk fs/xfs/xfs_message.c:24 [inline]
 xfs_alert_tag+0x1d3/0x2d0 fs/xfs/xfs_message.c:82
 xfs_buf_verifier_error+0x14c/0x290 fs/xfs/xfs_error.c:407
 xfs_agf_read_verify+0x1d2/0x250 fs/xfs/libxfs/xfs_alloc.c:-1
 xfs_buf_ioend+0x25c/0x6e0 fs/xfs/xfs_buf.c:1263
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>