INFO: task syz-executor:6940 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21968 pid: 6940 ppid: 1 flags:0x00004004
Call Trace:
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: 0033:0x7fa8322d1097
RSP: 002b:00007fffb3cb9728 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa8323651ca RCX: 00007fa8322d1097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb3cb97e0
RBP: 00007fffb3cb97e0 R08: 00007fffb3cba7e0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffb3cba870
R13: 00007fa8323651ca R14: 0000000000033dd4 R15: 00007fffb3cba8b0
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31f360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
4 locks held by kworker/u4:2/154:
#0: ffff888017a1c938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc90001fc7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
#2: ffff8880792a6650 (sb_internal#5){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x224/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4573
#3: ffff888058c22de8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x25b/0xdb0 fs/xfs/libxfs/xfs_bmap.c:4578
1 lock held by dhcpcd/3854:
#0: ffffffff8d43e4c8 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x258/0x1a70 net/ipv4/devinet.c:1076
2 locks held by getty/3947:
#0: ffff88802c916098 (&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
2 locks held by kworker/1:5/4236:
2 locks held by syz-executor/6940:
#0: ffff8880792a60e0
(
&type->s_umount_key
#70
){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:365
#1: ffff8881471ae7d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
#1: ffff8881471ae7d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x1a1/0x950 fs/fs-writeback.c:2785
2 locks held by syz.7.1482/10974:
#0: ffffffff8d43e4c8 (rtnl_mutex){+.+.}-{3:3}
, at: tun_detach drivers/net/tun.c:699 [inline]
, at: tun_chr_close+0x3d/0x1b0 drivers/net/tun.c:3440
#1: ffffffff8c323de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#1: ffffffff8c323de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845
4 locks held by syz.8.1483/10986:
#0: ffff888075f8be10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#0: ffff888075f8be10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:650 [inline]
#0: ffff888075f8be10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1345
#1: ffffffff8d499390 ((netlink_chain).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain+0x5e/0x1b0 kernel/notifier.c:317
#2: ffff888076a872b8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nft_rcv_nl_event+0x126/0x5c0 net/netfilter/nf_tables_api.c:10599
#3: ffffffff8c323de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#3: ffffffff8c323de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5460 Comm: kworker/1:18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: xfs-buf/loop4 xfs_buf_ioend_work
RIP: 0010:update_tg_load_avg kernel/sched/fair.c:3377 [inline]
RIP: 0010:update_load_avg+0xcc5/0x1130 kernel/sched/fair.c:3889
Code: 48 0f 48 c5 48 c1 eb 06 48 39 d8 0f 86 69 01 00 00 49 8d be 40 01 00 00 be 08 00 00 00 e8 13 78 68 00 f0 49 01 ae 40 01 00 00 <48> b8 00 00 00 00 00 fc ff df 41 80 3c 04 00 48 8b 5c 24 08 74 08
RSP: 0018:ffffc90000dd0a88 EFLAGS: 00000013
RAX: 0000000000000001 RBX: 0000000000000004 RCX: ffffffff8155ebdd
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88805f094e40
RBP: ffffffffffffffc3 R08: ffff88805f094e47 R09: 1ffff1100be129c8
R10: dffffc0000000000 R11: ffffed100be129c9 R12: 1ffff1100be93514
R13: 1ffff1100be93528 R14: ffff88805f094d00 R15: ffff88805f49a940
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34301ff8 CR3: 0000000073234000 CR4: 00000000003506e0
DR0: fffffffffffffff9 DR1: ffffffffff7fff00 DR2: 0000000000000008
DR3: 0000000080000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
enqueue_entity+0x130/0x1e60 kernel/sched/fair.c:4487
enqueue_task_fair+0x18a/0x16b0 kernel/sched/fair.c:5824
enqueue_task+0x182/0x2b0 kernel/sched/core.c:1996
activate_task kernel/sched/core.c:2024 [inline]
ttwu_do_activate+0x1b7/0x370 kernel/sched/core.c:3633
ttwu_queue kernel/sched/core.c:3842 [inline]
try_to_wake_up+0x618/0x1050 kernel/sched/core.c:4165
hrtimer_wakeup+0x4a/0x60 kernel/time/hrtimer.c:1921
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4f2/0xb70 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/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+0x301/0x370 kernel/printk/printk.c:1909
Code: 85 db 74 89 e8 e0 e9 18 00 fb 31 c0 eb 48 e8 d6 e9 18 00 e8 11 1b 5d 08 48 85 db 74 d1 e8 c7 e9 18 00 fb 48 c7 c7 a0 3e 31 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 68 2a 5f 60
RSP: 0018:ffffc90003f2f7a0 EFLAGS: 00000293
RAX: ffffffff81605f29 RBX: 0000000000000200 RCX: ffff888021248000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c313ea0
RBP: ffffc90003f2f870 R08: ffffffff901d823f R09: 1ffffffff203b047
R10: dffffc0000000000 R11: fffffbfff203b048 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff920007e5ef4
vprintk_emit+0xa7/0x150 kernel/printk/printk.c:2273
_printk+0xda/0x130 kernel/printk/printk.c:2299
print_hex_dump+0x1cf/0x2b0 lib/hexdump.c:285
xfs_hex_dump+0x39/0x50 fs/xfs/xfs_message.c:118
xfs_buf_verifier_error+0x1ba/0x290 fs/xfs/xfs_error.c:418
xfs_allocbt_read_verify+0x53/0xd0 fs/xfs/libxfs/xfs_alloc_btree.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