INFO: task syz-executor:14381 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:21584 pid:14381 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
io_schedule+0x7c/0xd0 kernel/sched/core.c:8503
wait_on_page_bit_common+0x83b/0xe50 mm/filemap.c:1356
lock_page include/linux/pagemap.h:625 [inline]
truncate_inode_pages_range+0xa24/0xfe0 mm/truncate.c:394
evict+0x4dc/0x8d0 fs/inode.c:649
dispose_list fs/inode.c:680 [inline]
evict_inodes+0x60c/0x6a0 fs/inode.c:734
generic_shutdown_super+0x93/0x300 fs/super.c:454
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: 0033:0x7fa0be877017
RSP: 002b:00007ffefebd2c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa0be90b120 RCX: 00007fa0be877017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffefebd2d20
RBP: 00007ffefebd2d20 R08: 00007ffefebd3d20 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffefebd3db0
R13: 00007fa0be90b120 R14: 000000000016ebde R15: 00007ffefebd3df0
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
2 locks held by udevd/3561:
2 locks held by getty/3951:
#0: ffff88802c7f8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
2 locks held by syz-executor/4186:
#0: ffff8880758820e0 (&type->s_umount_key#74){+.+.}-{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]
#1: ffffffff8c3235a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
1 lock held by udevd/10489:
2 locks held by kworker/0:6/17013:
#0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc90004047d00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
1 lock held by syz-executor/14381:
#0: ffff888029ab80e0 (&type->s_umount_key#135){+.+.}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:365
1 lock held by dhcpcd/16857:
#0: ffff888060648210 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#0: ffff888060648210 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:650 [inline]
#0: ffff888060648210 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1345
2 locks held by syz-executor/19538:
#0: ffff88802011a118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf9/0x7d0 block/bdev.c:915
#1: ffff88814785b468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xaa/0xb90 drivers/block/loop.c:1366
1 lock held by syz-executor/29531:
#0: ffffffff8c3235a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#0: ffffffff8c3235a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845
2 locks held by sed/31489:
=============================================
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 04/18/2026
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: 20692 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: 0x0 (writeback)
RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:81 [inline]
RIP: 0010:account_group_system_time include/linux/sched/cputime.h:151 [inline]
RIP: 0010:account_system_index_time kernel/sched/cputime.c:170 [inline]
RIP: 0010:account_system_time+0xa7/0x1a0 kernel/sched/cputime.c:201
Code: f1 bd 04 00 00 00 0f 44 e8 48 8d bb c0 06 00 00 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 b0 89 69 00 4c 01 b3 c0 06 00 00 <4c> 8d bb 20 09 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c
RSP: 0018:ffffc9000414fa78 EFLAGS: 00000006
RAX: 1ffff11004f7cc00 RBX: ffff888027be5940 RCX: 0000000000000000
RDX: 0000000000cc7385 RSI: 0000000000000000 RDI: ffff888027be6000
RBP: 0000000000000002 R08: ffffffff8f0ea048 R09: ffffffff8f0ea058
R10: ffffffff8f0ea050 R11: ffffffff8f0ea043 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000cc7385 R15: ffff888027be596c
FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a5c814a660 CR3: 0000000074739000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vtime_account_system kernel/sched/cputime.c:674 [inline]
__vtime_account_kernel+0x16a/0x200 kernel/sched/cputime.c:696
vtime_task_switch_generic+0x19b/0x570 kernel/sched/cputime.c:778
vtime_task_switch include/linux/vtime.h:95 [inline]
finish_task_switch+0x3c6/0x640 kernel/sched/core.c:4917
context_switch kernel/sched/core.c:5052 [inline]
__schedule+0x11f7/0x43c0 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
worker_thread+0xf57/0x1290 kernel/workqueue.c:2478
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287