INFO: task kworker/0:4:5876 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:4 state:D stack:23432 pid:5876 ppid:2 flags:0x00004000
Workqueue: gfs2_recovery gfs2_recover_func
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
io_schedule+0x80/0xd0 kernel/sched/core.c:9075
folio_wait_bit_common+0x881/0xfa0 mm/filemap.c:1329
folio_wait_locked include/linux/pagemap.h:1149 [inline]
gfs2_jhead_process_page+0x17e/0x750 fs/gfs2/lops.c:477
gfs2_find_jhead+0xc84/0xdc0 fs/gfs2/lops.c:594
gfs2_recover_func+0x6cd/0x1c80 fs/gfs2/recovery.c:460
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INFO: task syz.2.128:6377 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.128 state:D stack:24688 pid:6377 ppid:5784 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
bit_wait+0x11/0xd0 kernel/sched/wait_bit.c:199
__wait_on_bit+0x9f/0x2c0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x13c/0x190 kernel/sched/wait_bit.c:64
wait_on_bit include/linux/wait_bit.h:76 [inline]
gfs2_recover_journal+0xda/0x130 fs/gfs2/recovery.c:577
init_journal+0x1838/0x22f0 fs/gfs2/ops_fstype.c:833
init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:886
gfs2_fill_super+0x1828/0x1f90 fs/gfs2/ops_fstype.c:1266
get_tree_bdev+0x3e5/0x520 fs/super.c:1602
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344
vfs_get_tree+0x8c/0x280 fs/super.c:1775
do_new_mount+0x24a/0xa60 fs/namespace.c:3412
do_mount fs/namespace.c:3780 [inline]
__do_sys_mount fs/namespace.c:3989 [inline]
__se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3966
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa02cba07ca
RSP: 002b:00007fa02dacae58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa02dacaee0 RCX: 00007fa02cba07ca
RDX: 00002000000002c0 RSI: 0000200000000300 RDI: 00007fa02dacaea0
RBP: 00002000000002c0 R08: 00007fa02dacaee0 R09: 0000000000000010
R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000000300
R13: 00007fa02dacaea0 R14: 0000000000037fcc R15: 0000200000000340
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8e1322e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6669
3 locks held by kworker/u4:5/992:
#0: ffff8880b8c3c258 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:570
#1: ffffc900041f7d00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#1: ffffc900041f7d00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#2: ffff8880b8c295d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x123/0x270 kernel/time/timer.c:999
2 locks held by getty/5540:
#0: ffff88802f23c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
2 locks held by kworker/0:4/5876:
#0: ffff88801a6ab538 ((wq_completion)gfs2_recovery){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#0: ffff88801a6ab538 ((wq_completion)gfs2_recovery){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
#1: ffffc90004e3fd00 ((work_completion)(&jd->jd_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2632 [inline]
#1: ffffc90004e3fd00 ((work_completion)(&jd->jd_work)){+.+.}-{0:0}, at: process_scheduled_works+0x975/0x1600 kernel/workqueue.c:2734
1 lock held by syz.2.128/6377:
#0: ffff88805ce700e0 (&type->s_umount_key#58){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88805ce700e0 (&type->s_umount_key#58){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88805ce700e0 (&type->s_umount_key#58){+.+.}-{3:3}, at: get_tree_bdev+0x345/0x520 fs/super.c:1600
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 992 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x65/0xe0 kernel/kcov.c:346
Code: 57 41 56 41 54 53 48 8d 4c 09 01 48 8b 54 24 20 65 4c 8b 05 0d df 7b 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 <65> 44 8b 1d fb de 7b 7e 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01
RSP: 0018:ffffc900041f74f0 EFLAGS: 00000206
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 0000000000000003
RDX: ffffffff813beb18 RSI: ffffffff8dfa0a80 RDI: 0000000000000004
RBP: ffffc900041f7698 R08: ffff8880238d3c00 R09: 0000000000000005
R10: 0000000000000007 R11: 0000000000000000 R12: ffffffff901086b4
R13: ffffc900041f7648 R14: 0000000000000004 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005562d38456a0 CR3: 0000000032825000 CR4: 00000000003506e0
Call Trace:
unwind_next_frame+0x748/0x2990 arch/x86/kernel/unwind_orc.c:515
__unwind_start+0x5bb/0x730 arch/x86/kernel/unwind_orc.c:760
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
slab_alloc_node mm/slub.c:3518 [inline]
kmem_cache_alloc_node+0x1af/0x320 mm/slub.c:3563
__alloc_skb+0x103/0x2c0 net/core/skbuff.c:643
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x253/0xa90 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293