general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 3624 Comm: syz-executor887 Not tainted 5.19.0-rc8-syzkaller-00003-g5de64d44968e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
RIP: 0010:blk_mq_clear_rq_mapping block/blk-mq.c:3047 [inline]
RIP: 0010:blk_mq_free_rqs+0x3f8/0x960 block/blk-mq.c:3095
Code: de e8 0c fb 8f fd 83 fb 3f 0f 87 63 38 58 05 e8 be fe 8f fd b8 00 10 00 00 89 d9 48 d3 e0 4c 01 e8 48 89 44 24 08 48 8b 04 24 <0f> b6 00 84 c0 74 08 3c 03 0f 8e 96 03 00 00 41 8b 1f 31 ff 31 ed
RSP: 0018:ffffc90003067aa8 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000004
RDX: ffff88807cf46000 RSI: ffffffff83e99e52 RDI: 0000000000000005
RBP: ffff888020b68000 R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000004 R11: 0000000000000001 R12: ffffc90003067b60
R13: ffff88801e6f0000 R14: ffff88801e646000 R15: 0000000000000000
FS:  00007f5745cc6700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5745d81aa3 CR3: 0000000021a6a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_mq_sched_free_rqs block/blk-mq-sched.c:642 [inline]
 blk_mq_sched_free_rqs+0x1d4/0x250 block/blk-mq-sched.c:631
 elevator_exit block/elevator.c:196 [inline]
 elevator_switch_mq+0xc2/0x6c0 block/elevator.c:600
 blk_mq_elv_switch_none block/blk-mq.c:4451 [inline]
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4511 [inline]
 blk_mq_update_nr_hw_queues+0x3ee/0xdf0 block/blk-mq.c:4562
 nbd_start_device+0x153/0xc30 drivers/block/nbd.c:1356
 nbd_start_device_ioctl drivers/block/nbd.c:1406 [inline]
 __nbd_ioctl drivers/block/nbd.c:1480 [inline]
 nbd_ioctl+0x5a5/0xbd0 drivers/block/nbd.c:1520
 blkdev_ioctl+0x36e/0x800 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 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+0x63/0xcd
RIP: 0033:0x7f5745d19329
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5745cc62e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5745d9d4e0 RCX: 00007f5745d19329
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007f5745d6a194 R08: 0000000000000002 R09: 0000000000003331
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5745d9d4ec
R13: 00007f5745cc62f0 R14: 00007f5745d9d4e8 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:blk_mq_clear_rq_mapping block/blk-mq.c:3047 [inline]
RIP: 0010:blk_mq_free_rqs+0x3f8/0x960 block/blk-mq.c:3095
Code: de e8 0c fb 8f fd 83 fb 3f 0f 87 63 38 58 05 e8 be fe 8f fd b8 00 10 00 00 89 d9 48 d3 e0 4c 01 e8 48 89 44 24 08 48 8b 04 24 <0f> b6 00 84 c0 74 08 3c 03 0f 8e 96 03 00 00 41 8b 1f 31 ff 31 ed
RSP: 0018:ffffc90003067aa8 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000004
RDX: ffff88807cf46000 RSI: ffffffff83e99e52 RDI: 0000000000000005
RBP: ffff888020b68000 R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000004 R11: 0000000000000001 R12: ffffc90003067b60
R13: ffff88801e6f0000 R14: ffff88801e646000 R15: 0000000000000000
FS:  00007f5745cc6700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5745d81aa3 CR3: 0000000021a6a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e8 0c fb 8f fd       	callq  0xfd8ffb11
   5:	83 fb 3f             	cmp    $0x3f,%ebx
   8:	0f 87 63 38 58 05    	ja     0x5583871
   e:	e8 be fe 8f fd       	callq  0xfd8ffed1
  13:	b8 00 10 00 00       	mov    $0x1000,%eax
  18:	89 d9                	mov    %ebx,%ecx
  1a:	48 d3 e0             	shl    %cl,%rax
  1d:	4c 01 e8             	add    %r13,%rax
  20:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  25:	48 8b 04 24          	mov    (%rsp),%rax
* 29:	0f b6 00             	movzbl (%rax),%eax <-- trapping instruction
  2c:	84 c0                	test   %al,%al
  2e:	74 08                	je     0x38
  30:	3c 03                	cmp    $0x3,%al
  32:	0f 8e 96 03 00 00    	jle    0x3ce
  38:	41 8b 1f             	mov    (%r15),%ebx
  3b:	31 ff                	xor    %edi,%edi
  3d:	31 ed                	xor    %ebp,%ebp