INFO: task syz-executor:4279 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:22064 pid:4279 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2144
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x2c7/0x5a0 kernel/sched/completion.c:138
kthread_stop+0x197/0x650 kernel/kthread.c:711
signal_our_withdraw fs/gfs2/util.c:159 [inline]
gfs2_withdraw+0x607/0x16c0 fs/gfs2/util.c:354
gfs2_dinode_in fs/gfs2/glops.c:464 [inline]
gfs2_inode_refresh+0xb64/0xfd0 fs/gfs2/glops.c:484
gfs2_instantiate+0x15e/0x210 fs/gfs2/glock.c:520
gfs2_glock_holder_ready fs/gfs2/glock.c:1333 [inline]
gfs2_glock_wait+0x1d0/0x2a0 fs/gfs2/glock.c:1353
gfs2_glock_nq_init fs/gfs2/glock.h:255 [inline]
do_sync+0x4bf/0xc40 fs/gfs2/quota.c:927
gfs2_quota_sync+0x32c/0x700 fs/gfs2/quota.c:1329
gfs2_sync_fs+0x48/0xb0 fs/gfs2/super.c:664
sync_filesystem+0xe6/0x220 fs/sync.c:56
generic_shutdown_super+0x6b/0x340 fs/super.c:474
kill_block_super+0x7c/0xe0 fs/super.c:1470
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191
task_work_run+0x1d0/0x260 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fdc7cf9d9d7
RSP: 002b:00007ffceb9f9528 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fdc7d032050 RCX: 00007fdc7cf9d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffceb9f95e0
RBP: 00007ffceb9f95e0 R08: 00007ffceb9fa5e0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffceb9fa670
R13: 00007fdc7d032050 R14: 00000000000367d7 R15: 00007ffceb9fa6b0
INFO: task gfs2_quotad:5607 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:gfs2_quotad state:D stack:28240 pid:5607 ppid:2 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6697
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x562/0xaf0 kernel/locking/mutex.c:747
gfs2_quota_sync+0x91/0x700 fs/gfs2/quota.c:1313
quotad_check_timeo fs/gfs2/quota.c:1519 [inline]
gfs2_quotad+0x420/0x680 fs/gfs2/quota.c:1566
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cb2dfb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cb2e7d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2d620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4033:
#0: ffff88814cfb1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x429/0x1390 drivers/tty/n_tty.c:2198
1 lock held by udevd/4277:
#0: ffff888017889d20 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
#0: ffff888017889d20 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_read_iter+0x41d/0x570 block/fops.c:667
4 locks held by syz-executor/4279:
#0: ffff888075d6a0e0 (&type->s_umount_key#63){+.+.}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffff888055368b70 (&sdp->sd_quota_sync_mutex){+.+.}-{3:3}, at: gfs2_quota_sync+0x91/0x700 fs/gfs2/quota.c:1313
#2: ffff888055ac8150 (&gfs2_quota_imutex_key){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#2: ffff888055ac8150 (&gfs2_quota_imutex_key){+.+.}-{3:3}, at: do_sync+0x36b/0xc40 fs/gfs2/quota.c:919
#3: ffff888055369248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: signal_our_withdraw fs/gfs2/util.c:155 [inline]
#3: ffff888055369248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: gfs2_withdraw+0x594/0x16c0 fs/gfs2/util.c:354
2 locks held by kworker/u4:6/4332:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc900043a7d00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/0:9/4358:
1 lock held by gfs2_quotad/5607:
#0: ffff888055368b70 (&sdp->sd_quota_sync_mutex){+.+.}-{3:3}, at: gfs2_quota_sync+0x91/0x700 fs/gfs2/quota.c:1313
2 locks held by kworker/u4:15/6293:
#0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
#1: ffffc9000470fd00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267
2 locks held by syz.1.710/7125:
#0: ffff888029922110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_close_device drivers/input/evdev.c:411 [inline]
#0: ffff888029922110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_release+0x705/0x800 drivers/input/evdev.c:456
#1: ffff8880299202c0 (&dev->mutex#2){+.+.}-{3:3}, at: input_close_device+0x48/0x1d0 drivers/input/input.c:700
2 locks held by syz.6.711/7127:
#0: ffff88807147f410 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#0: ffff88807147f410 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:653 [inline]
#0: ffff88807147f410 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1399
#1: ffffffff8cb332f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
#1: ffffffff8cb332f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3c0/0x890 kernel/rcu/tree_exp.h:962
1 lock held by syz.6.711/7133:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4259 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__switch_to_asm+0x49/0x60 arch/x86/entry/entry_64.S:258
Code: 65 48 89 1c 25 28 00 00 00 49 c7 c4 10 00 00 00 e8 01 00 00 00 cc e8 01 00 00 00 cc 48 83 c4 10 49 ff cc 75 eb 0f ae e8 41 5f <41> 5e 41 5d 41 5c 5b 5d e9 da b3 2c 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900033178b0 EFLAGS: 00000046
RAX: 1ffff110171c7562 RBX: d02b8c615d405100 RCX: 1ffff110171c7709
RDX: 0000000000000000 RSI: ffff88807a1d8000 RDI: ffff88802e70d940
RBP: ffffc90003d27c10 R08: ffffffff8e1fd76f R09: 1ffffffff1c3faed
R10: dffffc0000000000 R11: fffffbfff1c3faee R12: 0000000000000000
R13: ffff8880b8e3b848 R14: 1ffff110171c770b R15: dffffc0000000000
FS: 000055555d74d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faf93de7158 CR3: 000000007ba08000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vkms_vblank_simulate: vblank timer overrun