INFO: task syz-executor308:6544 can't die for more than 143 seconds.
task:syz-executor308 state:D stack:26784 pid: 6544 ppid: 6543 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:4953 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6234
schedule+0xd2/0x260 kernel/sched/core.c:6307
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
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+0x174/0x270 kernel/sched/completion.c:138
flush_workqueue+0x3ed/0x15b0 kernel/workqueue.c:2869
nbd_start_device_ioctl drivers/block/nbd.c:1364 [inline]
__nbd_ioctl drivers/block/nbd.c:1427 [inline]
nbd_ioctl+0x6d8/0xb10 drivers/block/nbd.c:1467
blkdev_ioctl+0x2a1/0x700 block/ioctl.c:589
block_ioctl+0xfa/0x140 block/fops.c:478
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd8d39a4389
RSP: 002b:00007ffcce3d0ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd8d39a4389
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffcce3d0c88 R09: 00007ffcce3d0c88
R10: 00007ffcce3d0c88 R11: 0000000000000246 R12: 00007fd8d39636a0
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
</TASK>
INFO: task syz-executor308:6544 blocked for more than 143 seconds.
Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor308 state:D stack:26784 pid: 6544 ppid: 6543 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:4953 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6234
schedule+0xd2/0x260 kernel/sched/core.c:6307
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
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+0x174/0x270 kernel/sched/completion.c:138
flush_workqueue+0x3ed/0x15b0 kernel/workqueue.c:2869
nbd_start_device_ioctl drivers/block/nbd.c:1364 [inline]
__nbd_ioctl drivers/block/nbd.c:1427 [inline]
nbd_ioctl+0x6d8/0xb10 drivers/block/nbd.c:1467
blkdev_ioctl+0x2a1/0x700 block/ioctl.c:589
block_ioctl+0xfa/0x140 block/fops.c:478
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fd8d39a4389
RSP: 002b:00007ffcce3d0ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd8d39a4389
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffcce3d0c88 R09: 00007ffcce3d0c88
R10: 00007ffcce3d0c88 R11: 0000000000000246 R12: 00007fd8d39636a0
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb813a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
3 locks held by kworker/u4:2/44:
#0: ffff8880b9c39a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:478
#1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x173/0x490 kernel/sched/psi.c:871
#2: ffff8880b9c28258 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:946
3 locks held by kworker/u5:0/46:
#0: ffff88807be8b138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88807be8b138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff88807be8b138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
#0: ffff88807be8b138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
#0: ffff88807be8b138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
#0: ffff88807be8b138 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268
#1: ffffc9000116fdb0 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
#2: ffff88801c1a4120 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1637 [inline]
#2: ffff88801c1a4120 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_recvmsg+0xbc/0x850 net/ax25/af_ax25.c:1627
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 44 Comm: kworker/u4:2 Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:590 [inline]
RIP: 0010:queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline]
RIP: 0010:do_raw_spin_unlock+0x147/0x230 kernel/locking/spinlock_debug.c:141
Code: c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 92 00 00 00 48 c7 c0 20 6e 9f 8b c7 45 08 ff ff ff ff <48> ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 b7 00
RSP: 0018:ffffc9000114f9d0 EFLAGS: 00000246
RAX: ffffffff8b9f6e20 RBX: 0000000000000007 RCX: ffffffff815c2670
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888010db8120
RBP: ffff888010db8120 R08: 0000000000000000 R09: ffff888010db8123
R10: ffffed10021b7024 R11: 000000000000003f R12: ffff888010db8128
R13: ffff888010db8130 R14: 0000000000000f8a R15: ffffffff8bcac5c0
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7372c12020 CR3: 000000000b88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:408 [inline]
__text_poke+0x5d4/0x8c0 arch/x86/kernel/alternative.c:876
text_poke_bp_batch+0x3d7/0x560 arch/x86/kernel/alternative.c:1178
text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1265 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate mm/kfence/core.c:731 [inline]
toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:723
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.161 msecs
----------------
Code disassembly (best guess):
0: c1 ea 03 shr $0x3,%edx
3: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx
7: 4c 89 e0 mov %r12,%rax
a: 83 e0 07 and $0x7,%eax
d: 83 c0 03 add $0x3,%eax
10: 38 d0 cmp %dl,%al
12: 7c 08 jl 0x1c
14: 84 d2 test %dl,%dl
16: 0f 85 92 00 00 00 jne 0xae
1c: 48 c7 c0 20 6e 9f 8b mov $0xffffffff8b9f6e20,%rax
23: c7 45 08 ff ff ff ff movl $0xffffffff,0x8(%rbp)
* 2a: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx <-- trapping instruction
31: fc ff df
34: 48 c1 e8 03 shr $0x3,%rax
38: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1)
3c: 0f .byte 0xf
3d: 85 .byte 0x85
3e: b7 00 mov $0x0,%bh