INFO: task syz-executor.0:8131 blocked for more than 143 seconds.
      Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:28496 pid: 8131 ppid: 17310 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6250
 schedule+0xd2/0x260 kernel/sched/core.c:6323
 blk_mq_freeze_queue_wait+0x112/0x160 block/blk-mq.c:178
 nbd_add_socket+0x166/0x810 drivers/block/nbd.c:1109
 __nbd_ioctl drivers/block/nbd.c:1454 [inline]
 nbd_ioctl+0x38c/0xb10 drivers/block/nbd.c:1511
 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
 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: 0033:0x7fe32cc92ae9
RSP: 002b:00007fe32a208188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe32cda5f60 RCX: 00007fe32cc92ae9
RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003
RBP: 00007fe32ccecf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcda0cff7f R14: 00007fe32a208300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.0:8138 blocked for more than 143 seconds.
      Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:29592 pid: 8138 ppid: 17310 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6250
 schedule+0xd2/0x260 kernel/sched/core.c:6323
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6382
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 nbd_ioctl+0x151/0xb10 drivers/block/nbd.c:1504
 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
 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: 0033:0x7fe32cc92ae9
RSP: 002b:00007fe32a1e7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe32cda6020 RCX: 00007fe32cc92ae9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007fe32ccecf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcda0cff7f R14: 00007fe32a1e7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.0:8164 blocked for more than 143 seconds.
      Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:29592 pid: 8164 ppid: 17310 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6250
 schedule+0xd2/0x260 kernel/sched/core.c:6323
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6382
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 nbd_ioctl+0x151/0xb10 drivers/block/nbd.c:1504
 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609
 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: 0033:0x7fe32cc92ae9
RSP: 002b:00007fe32a184188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe32cda6260 RCX: 00007fe32cc92ae9
RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003
RBP: 00007fe32ccecf6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcda0cff7f R14: 00007fe32a184300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb83b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
2 locks held by in:imklog/6211:
2 locks held by agetty/6221:
 #0: ffff888022b8e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002aa82e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113
1 lock held by syz-executor.0/8131:
 #0: ffff88801a4b9998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x151/0xb10 drivers/block/nbd.c:1504
1 lock held by syz-executor.0/8138:
 #0: ffff88801a4b9998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x151/0xb10 drivers/block/nbd.c:1504
1 lock held by syz-executor.0/8164:
 #0: ffff88801a4b9998 (&nbd->config_lock){+.+.}-{3:3}, at: nbd_ioctl+0x151/0xb10 drivers/block/nbd.c:1504

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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:210 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:295
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1082 Comm: kworker/u4:5 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:hlock_id kernel/locking/lockdep.c:401 [inline]
RIP: 0010:__lock_acquire+0xa38/0x54a0 kernel/locking/lockdep.c:5015
Code: 58 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 38 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 35 38 00 00 41 0f b7 44 24 20 <66> 25 ff 1f 66 89 44 24 08 41 0f b6 44 24 22 83 e0 03 48 83 7c 24
RSP: 0018:ffffc90004b2f788 EFLAGS: 00000046
RAX: 0000000000000090 RBX: 0000000000307419 RCX: ffffffff815caaea
RDX: 1ffff11003832169 RSI: 0000000000000008 RDI: ffff88801c190b49
RBP: ffff88801c190b4a R08: 0000000000000000 R09: ffffffff8ff75a17
R10: fffffbfff1feeb42 R11: 000000000000003f R12: ffff88801c190b28
R13: ffff88801c190000 R14: 0000000000000000 R15: 9003074182af4f12
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7eee5cb030 CR3: 000000000b88e000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5637 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 __get_locked_pte+0x2b6/0x4d0 mm/memory.c:1722
 get_locked_pte include/linux/mm.h:2160 [inline]
 __text_poke+0x1ae/0x8c0 arch/x86/kernel/alternative.c:1000
 text_poke_bp_batch+0x2eb/0x560 arch/x86/kernel/alternative.c:1310
 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1448 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458
 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_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 toggle_allocation_gate mm/kfence/core.c:746 [inline]
 toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:724
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	58                   	pop    %rax
   1:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   8:	fc ff df
   b:	48 8b 54 24 38       	mov    0x38(%rsp),%rdx
  10:	48 c1 ea 03          	shr    $0x3,%rdx
  14:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
  18:	84 c0                	test   %al,%al
  1a:	74 08                	je     0x24
  1c:	3c 03                	cmp    $0x3,%al
  1e:	0f 8e 35 38 00 00    	jle    0x3859
  24:	41 0f b7 44 24 20    	movzwl 0x20(%r12),%eax
* 2a:	66 25 ff 1f          	and    $0x1fff,%ax <-- trapping instruction
  2e:	66 89 44 24 08       	mov    %ax,0x8(%rsp)
  33:	41 0f b6 44 24 22    	movzbl 0x22(%r12),%eax
  39:	83 e0 03             	and    $0x3,%eax
  3c:	48                   	rex.W
  3d:	83                   	.byte 0x83
  3e:	7c 24                	jl     0x64