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: 3637 Comm: syz-executor392 Not tainted 6.0.0-syzkaller-03015-g2bca25eaeba6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:blk_mq_clear_rq_mapping block/blk-mq.c:3040 [inline]
RIP: 0010:blk_mq_free_rqs+0x3f8/0x960 block/blk-mq.c:3088
Code: de e8 ec fa 94 fd 83 fb 3f 0f 87 14 8a 67 05 e8 1e fe 94 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:ffffc9000351faa8 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000004
RDX: ffff88807d2cc100 RSI: ffffffff83e54302 RDI: 0000000000000005
RBP: ffff888021672000 R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000004 R11: ffff88813fffa700 R12: ffffc9000351fb60
R13: ffff888070470000 R14: ffff888147537000 R15: 0000000000000000
FS: 00007fbc2f35d700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc2f3e2860 CR3: 00000000747b7000 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:4483 [inline]
__blk_mq_update_nr_hw_queues block/blk-mq.c:4543 [inline]
blk_mq_update_nr_hw_queues+0x3ee/0xdf0 block/blk-mq.c:4594
nbd_start_device+0x153/0xc30 drivers/block/nbd.c:1357
nbd_start_device_ioctl drivers/block/nbd.c:1407 [inline]
__nbd_ioctl drivers/block/nbd.c:1481 [inline]
nbd_ioctl+0x5a1/0xbd0 drivers/block/nbd.c:1521
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: 0033:0x7fbc2f3b0319
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:00007fbc2f35d2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbc2f4344e0 RCX: 00007fbc2f3b0319
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007fbc2f401194 R08: 0000000000000002 R09: 0000000000003331
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbc2f4344ec
R13: 00007fbc2f35d2f0 R14: 00007fbc2f4344e8 R15: 0000000000000002
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:blk_mq_clear_rq_mapping block/blk-mq.c:3040 [inline]
RIP: 0010:blk_mq_free_rqs+0x3f8/0x960 block/blk-mq.c:3088
Code: de e8 ec fa 94 fd 83 fb 3f 0f 87 14 8a 67 05 e8 1e fe 94 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:ffffc9000351faa8 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000004
RDX: ffff88807d2cc100 RSI: ffffffff83e54302 RDI: 0000000000000005
RBP: ffff888021672000 R08: 0000000000000005 R09: 000000000000003f
R10: 0000000000000004 R11: ffff88813fffa700 R12: ffffc9000351fb60
R13: ffff888070470000 R14: ffff888147537000 R15: 0000000000000000
FS: 00007fbc2f35d700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc2f3f14c0 CR3: 00000000747b7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: de e8 fsubrp %st,%st(0)
2: ec in (%dx),%al
3: fa cli
4: 94 xchg %eax,%esp
5: fd std
6: 83 fb 3f cmp $0x3f,%ebx
9: 0f 87 14 8a 67 05 ja 0x5678a23
f: e8 1e fe 94 fd callq 0xfd94fe32
14: b8 00 10 00 00 mov $0x1000,%eax
19: 89 d9 mov %ebx,%ecx
1b: 48 d3 e0 shl %cl,%rax
1e: 4c 01 e8 add %r13,%rax
21: 48 89 44 24 08 mov %rax,0x8(%rsp)
26: 48 8b 04 24 mov (%rsp),%rax
* 2a: 0f b6 00 movzbl (%rax),%eax <-- trapping instruction
2d: 84 c0 test %al,%al
2f: 74 08 je 0x39
31: 3c 03 cmp $0x3,%al
33: 0f 8e 96 03 00 00 jle 0x3cf
39: 41 8b 1f mov (%r15),%ebx
3c: 31 ff xor %edi,%edi
3e: 31 ed xor %ebp,%ebp