INFO: task kworker/1:0H:25 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0H state:D stack:26952 pid:25 tgid:25 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: gfs2-glock/syz:syz glock_work_func
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x165c/0x5520 kernel/sched/core.c:6966
__schedule_loop kernel/sched/core.c:7049 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7064
io_schedule+0x7f/0xd0 kernel/sched/core.c:7891
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit_lock+0xec/0x4e0 kernel/sched/wait_bit.c:93
out_of_line_wait_on_bit_lock+0x13b/0x190 kernel/sched/wait_bit.c:120
wait_on_bit_lock_io include/linux/wait_bit.h:221 [inline]
__lock_buffer fs/buffer.c:72 [inline]
lock_buffer include/linux/buffer_head.h:432 [inline]
discard_buffer fs/buffer.c:1603 [inline]
block_invalidate_folio+0x370/0x730 fs/buffer.c:1660
folio_invalidate mm/truncate.c:140 [inline]
truncate_cleanup_folio+0xcb/0x190 mm/truncate.c:160
truncate_inode_pages_range+0x2ce/0xe30 mm/truncate.c:404
inode_go_inval+0x13c/0x360 fs/gfs2/glops.c:366
do_xmote+0x289/0x760 fs/gfs2/glock.c:699
glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1011
process_one_work kernel/workqueue.c:3278 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3361
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3442
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
INFO: task syz-executor:7524 blocked in I/O wait for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21856 pid:7524 tgid:7524 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x165c/0x5520 kernel/sched/core.c:6966
__schedule_loop kernel/sched/core.c:7049 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7064
io_schedule+0x7f/0xd0 kernel/sched/core.c:7891
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:250
__wait_on_bit+0xb9/0x310 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0x13b/0x190 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
gfs2_evict_inode+0xbd2/0x12d0 fs/gfs2/super.c:1493
evict+0x61e/0xb10 fs/inode.c:846
free_local_statfs_inodes fs/gfs2/super.c:1532 [inline]
gfs2_put_super+0x635/0x860 fs/gfs2/super.c:632
generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
kill_block_super+0x44/0x90 fs/super.c:1725
deactivate_locked_super+0xbc/0x130 fs/super.c:476
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e1939d9d7
RSP: 002b:00007fffd02ddc58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4e19432050 RCX: 00007f4e1939d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffd02ddd10
RBP: 00007fffd02ddd10 R08: 00007fffd02ded10 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffd02deda0
R13: 00007f4e19432050 R14: 0000000000038a42 R15: 00007fffd02dede0
</TASK>
Showing all locks held in the system:
2 locks held by kworker/1:0H/25:
#0: ffff88807c8d7540 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3253 [inline]
#0: ffff88807c8d7540 ((wq_completion)gfs2-glock/syz:syz){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3361
#1: ffffc900001f7c40 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3254 [inline]
#1: ffffc900001f7c40 ((work_completion)(&(&gl->gl_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3361
1 lock held by khungtaskd/30:
#0: ffffffff8e75d0e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75d0e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75d0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:4/65:
2 locks held by getty/5596:
#0: ffff888036a6a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/7524:
#0: ffff888030e640d8 (&type->s_umount_key#112){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888030e640d8 (&type->s_umount_key#112){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888030e640d8 (&type->s_umount_key#112){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
1 lock held by syz-executor/8859:
#0: ffff8880778560d8 (&type->s_umount_key#33){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880778560d8 (&type->s_umount_key#33){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880778560d8 (&type->s_umount_key#33){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10568 Comm: dhcpcd-run-hook Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:879 [inline]
RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1193 [inline]
RIP: 0010:unwind_next_frame+0x1b76/0x2550 arch/x86/kernel/unwind_orc.c:709
Code: 4c 8b 6c 24 20 41 0f b6 44 2d 00 84 c0 0f 85 81 02 00 00 41 c7 06 00 00 00 00 31 db e8 63 38 3b 0a 85 c0 74 3a e8 3a 1c 34 00 <84> c0 75 31 e8 51 38 3b 0a 85 c0 74 28 80 3d 64 23 85 0e 00 75 1f
RSP: 0000:ffffc900000076f8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffffff90a76e01 RCX: 0000000000000104
RDX: ffffc90000007801 RSI: ffffffff8c288360 RDI: ffffffff8c288320
RBP: dffffc0000000000 R08: ffffc90000007818 R09: 0000000000000000
R10: ffffc90000007878 R11: fffff52000000f11 R12: ffffc90000007828
R13: ffffc90000000000 R14: ffffc90000007828 R15: ffffffff81771696
FS: 00007f55cb6f9c80(0000) GS:ffff88812543f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e20e959000 CR3: 0000000027a4e000 CR4: 00000000003526f0
Call Trace:
<IRQ>
__unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
insert_work+0x3d/0x330 kernel/workqueue.c:2202
__queue_work+0xccf/0xfc0 kernel/workqueue.c:2357
call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1794 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x67e/0x8b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
handle_softirqs+0x22a/0x840 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:check_region_inline mm/kasan/generic.c:182 [inline]
RIP: 0010:kasan_check_range+0x10/0x2c0 mm/kasan/generic.c:200
Code: ae f8 fe 90 0f 0b cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 55 41 57 41 56 41 55 41 54 53 b0 01 <48> 85 f6 0f 84 ae 01 00 00 4c 8d 04 37 49 39 f8 0f 82 36 02 00 00
RSP: 0000:ffffc90005baf590 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffea000125df08 RCX: ffffffff8221abb3
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea000125df34
RBP: ffffea000125df30 R08: ffffea000125df33 R09: 1ffffd400024bbe6
R10: dffffc0000000000 R11: fffff9400024bbe7 R12: ffffea000125df18
R13: 0000000000000000 R14: ffffea000125df34 R15: 0000000000000040
instrument_atomic_read include/linux/instrumented.h:82 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
page_ref_count include/linux/page_ref.h:67 [inline]
page_expected_state mm/page_alloc.c:1033 [inline]
check_new_page mm/page_alloc.c:1750 [inline]
check_new_pages mm/page_alloc.c:1764 [inline]
__rmqueue_pcplist+0x18b3/0x1b60 mm/page_alloc.c:3338
rmqueue_pcplist mm/page_alloc.c:3364 [inline]
rmqueue mm/page_alloc.c:3394 [inline]
get_page_from_freelist+0x917/0x2540 mm/page_alloc.c:3935
__alloc_frozen_pages_noprof+0x233/0x3d0 mm/page_alloc.c:5218
alloc_pages_mpol+0x235/0x490 mm/mempolicy.c:2490
folio_alloc_mpol_noprof+0x39/0x160 mm/mempolicy.c:2509
vma_alloc_folio_noprof+0xe1/0x1e0 mm/mempolicy.c:2544
folio_prealloc mm/memory.c:-1 [inline]
alloc_anon_folio mm/memory.c:5292 [inline]
do_anonymous_page mm/memory.c:5386 [inline]
do_pte_missing+0x15cb/0x3530 mm/memory.c:4548
handle_pte_fault mm/memory.c:6464 [inline]
__handle_mm_fault mm/memory.c:6602 [inline]
handle_mm_fault+0x1bd7/0x3170 mm/memory.c:6771
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f55cb9b549e
Code: f3 e8 e6 db ff ff 48 85 c0 75 0a 48 85 db 74 05 e8 8e ff ff ff 5b c3 53 48 89 fb e8 c3 ff ff ff 48 89 d9 48 92 31 c0 48 89 d7 <f3> aa 48 92 5b c3 48 89 f8 48 85 ff 74 14 51 48 97 e8 1c e2 ff ff
RSP: 002b:00007ffe5b53b270 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000002888 RCX: 0000000000001dd8
RDX: 000055e20e958550 RSI: 0000000000002888 RDI: 000055e20e959000
RBP: 0000000000002888 R08: 00007f55cb993ac0 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000202 R12: 000055e20e94f910
R13: 0000000000000000 R14: 000055e20e94f910 R15: 00007f55cba42cac
</TASK>
----------------
Code disassembly (best guess):
0: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13
5: 41 0f b6 44 2d 00 movzbl 0x0(%r13,%rbp,1),%eax
b: 84 c0 test %al,%al
d: 0f 85 81 02 00 00 jne 0x294
13: 41 c7 06 00 00 00 00 movl $0x0,(%r14)
1a: 31 db xor %ebx,%ebx
1c: e8 63 38 3b 0a call 0xa3b3884
21: 85 c0 test %eax,%eax
23: 74 3a je 0x5f
25: e8 3a 1c 34 00 call 0x341c64
* 2a: 84 c0 test %al,%al <-- trapping instruction
2c: 75 31 jne 0x5f
2e: e8 51 38 3b 0a call 0xa3b3884
33: 85 c0 test %eax,%eax
35: 74 28 je 0x5f
37: 80 3d 64 23 85 0e 00 cmpb $0x0,0xe852364(%rip) # 0xe8523a2
3e: 75 1f jne 0x5f