RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f7d9848ad29
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007ffee56cac20 R08: 0000000000000002 R09: 00007f7d98003631
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
BUG: unable to handle kernel NULL pointer dereference at 0000000000000120
IP: set_bit arch/x86/include/asm/bitops.h:81 [inline]
IP: cpumask_set_cpu include/linux/cpumask.h:283 [inline]
IP: blk_mq_map_swqueue+0x253/0x990 block/blk-mq.c:2171
PGD a3115067 P4D a3115067 PUD b3825067 PMD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7963 Comm: syz-executor271 Not tainted 4.14.295-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
task: ffff8880982a6180 task.stack: ffff8880919d0000
RIP: 0010:set_bit arch/x86/include/asm/bitops.h:81 [inline]
RIP: 0010:cpumask_set_cpu include/linux/cpumask.h:283 [inline]
RIP: 0010:blk_mq_map_swqueue+0x253/0x990 block/blk-mq.c:2171
RSP: 0018:ffff8880919d7a80 EFLAGS: 00010297
RAX: ffff8880982a6180 RBX: ffff8880ae93b0b0 RCX: 1ffff11015d0a3d1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88cc8d68
RBP: 0000000000000001 R08: ffff8880ae851e80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8882386df840 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000555555e07300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000120 CR3: 00000000ab3ae000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
blk_mq_queue_reinit block/blk-mq.c:2514 [inline]
__blk_mq_update_nr_hw_queues block/blk-mq.c:2752 [inline]
blk_mq_update_nr_hw_queues+0x246/0x3e0 block/blk-mq.c:2762
nbd_start_device+0x1d7/0xca0 drivers/block/nbd.c:1201
nbd_start_device_ioctl drivers/block/nbd.c:1252 [inline]
__nbd_ioctl drivers/block/nbd.c:1334 [inline]
nbd_ioctl+0x3c4/0xac0 drivers/block/nbd.c:1374
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x540/0x1830 block/ioctl.c:594
block_ioctl+0xd9/0x120 fs/block_dev.c:1893
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f7d9848ad29
RSP: 002b:00007ffee56cac18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f7d9848ad29
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007ffee56cac20 R08: 0000000000000002 R09: 00007f7d98003631
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 4d 8d 34 c8 4c 89 f1 48 c1 e9 03 42 80 3c 39 00 0f 85 37 05 00 00 83 fd 07 4d 8b 36 0f 87 42 04 00 00 48 89 04 24 e8 ad 04 4a fe <f0> 4d 0f ab a6 20 01 00 00 49 8d be 78 01 00 00 48 8b 04 24 48
RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff8880919d7a80
RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff8880919d7a80
RIP: blk_mq_map_swqueue+0x253/0x990 block/blk-mq.c:2171 RSP: ffff8880919d7a80
CR2: 0000000000000120
---[ end trace 37b25f9166bd04db ]---
----------------
Code disassembly (best guess):
0: 4d 8d 34 c8 lea (%r8,%rcx,8),%r14
4: 4c 89 f1 mov %r14,%rcx
7: 48 c1 e9 03 shr $0x3,%rcx
b: 42 80 3c 39 00 cmpb $0x0,(%rcx,%r15,1)
10: 0f 85 37 05 00 00 jne 0x54d
16: 83 fd 07 cmp $0x7,%ebp
19: 4d 8b 36 mov (%r14),%r14
1c: 0f 87 42 04 00 00 ja 0x464
22: 48 89 04 24 mov %rax,(%rsp)
26: e8 ad 04 4a fe callq 0xfe4a04d8
* 2b: f0 4d 0f ab a6 20 01 lock bts %r12,0x120(%r14) <-- trapping instruction
32: 00 00
34: 49 8d be 78 01 00 00 lea 0x178(%r14),%rdi
3b: 48 8b 04 24 mov (%rsp),%rax
3f: 48 rex.W