INFO: task syz-executor:5797 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22144 pid:5797 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x97/0x280 kernel/time/timer.c:2143
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+0x2b9/0x590 kernel/sched/completion.c:138
kthread_stop+0x197/0x650 kernel/kthread.c:711
signal_our_withdraw fs/gfs2/util.c:159 [inline]
gfs2_withdraw+0x643/0x1780 fs/gfs2/util.c:354
gfs2_dinode_in fs/gfs2/glops.c:464 [inline]
gfs2_inode_refresh+0xb5e/0xfc0 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+0x49a/0xc00 fs/gfs2/quota.c:927
gfs2_quota_sync+0x32c/0x6f0 fs/gfs2/quota.c:1329
gfs2_sync_fs+0x48/0xb0 fs/gfs2/super.c:660
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+0x463/0x4f0 fs/namespace.c:1191
task_work_run+0x1ca/0x250 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:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9a90f90a77
RSP: 002b:00007ffd9f030018 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9a91013d7d RCX: 00007f9a90f90a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd9f0300d0
RBP: 00007ffd9f0300d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd9f031160
R13: 00007f9a91013d7d R14: 0000000000022e23 R15: 00007ffd9f0311a0
INFO: task gfs2_quotad:6733 blocked for more than 145 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:6733 ppid:2 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x555/0xaf0 kernel/locking/mutex.c:747
gfs2_quota_sync+0x91/0x6f0 fs/gfs2/quota.c:1313
quotad_check_timeo fs/gfs2/quota.c:1519 [inline]
gfs2_quotad+0x413/0x670 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: ffffffff8cb2b630 (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: ffffffff8cb2be50 (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: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
2 locks held by getty/4031:
#0: ffff88802f715098 (&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+0x41b/0x1380 drivers/tty/n_tty.c:2198
1 lock held by udevd/4281:
#0: ffff8880b8f3aad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
4 locks held by syz-executor/5797:
#0: ffff88802c1580e0 (&type->s_umount_key#67){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffff88805ba18b70 (&sdp->sd_quota_sync_mutex){+.+.}-{3:3}, at: gfs2_quota_sync+0x91/0x6f0 fs/gfs2/quota.c:1313
#2: ffff8880508ab710 (&gfs2_quota_imutex_key){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#2: ffff8880508ab710 (&gfs2_quota_imutex_key){+.+.}-{3:3}, at: do_sync+0x349/0xc00 fs/gfs2/quota.c:919
#3: ffff88805ba19248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: signal_our_withdraw fs/gfs2/util.c:155 [inline]
#3: ffff88805ba19248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: gfs2_withdraw+0x5d0/0x1780 fs/gfs2/util.c:354
1 lock held by gfs2_quotad/6733:
#0: ffff88805ba18b70 (&sdp->sd_quota_sync_mutex){+.+.}-{3:3}, at: gfs2_quota_sync+0x91/0x6f0 fs/gfs2/quota.c:1313
1 lock held by syz.0.770/7195:
#0: ffff88802c1580e0 (&type->s_umount_key#67){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:755
1 lock held by syz.0.770/7249:
#0: ffff88802c1580e0 (&type->s_umount_key#67){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:755
3 locks held by kworker/u4:19/8202:
1 lock held by rm/9354:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8202 Comm: kworker/u4:19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline]
RIP: 0010:do_raw_spin_lock+0x85/0x280 kernel/locking/spinlock_debug.c:114
Code: f1 f1 04 f3 f3 f3 48 89 4c 24 18 4a 89 04 39 4c 8d 77 04 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 9a 01 00 00 41 8b 06 <3d> ad 4e ad de 0f 85 16 01 00 00 4c 8d 63 10 4d 89 e6 49 c1 ee 03
RSP: 0018:ffffc90004f5f820 EFLAGS: 00000046
RAX: 00000000dead4ead RBX: ffffffff96e6b728 RCX: 1ffff920009ebf08
RDX: 0000000000000000 RSI: ffffffff8a8c1700 RDI: ffffffff96e6b728
RBP: ffffc90004f5f8d0 R08: dffffc0000000000 R09: fffffbfff215c449
R10: fffffbfff215c449 R11: 1ffffffff215c448 R12: dffffc0000000000
R13: ffff88807c180000 R14: ffffffff96e6b72c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bd5df6c3c8 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb0/0xf0 kernel/locking/spinlock.c:162
__debug_check_no_obj_freed lib/debugobjects.c:968 [inline]
debug_check_no_obj_freed+0x136/0x530 lib/debugobjects.c:1009
slab_free_hook mm/slub.c:1704 [inline]
slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
skb_free_head net/core/skbuff.c:762 [inline]
skb_release_data+0x5db/0x7c0 net/core/skbuff.c:791
skb_release_all net/core/skbuff.c:856 [inline]
__kfree_skb net/core/skbuff.c:870 [inline]
consume_skb+0xa2/0x100 net/core/skbuff.c:1035
nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
nsim_dev_trap_report_work+0x76b/0xaf0 drivers/net/netdevsim/dev.c:851
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295