BUG: unable to handle kernel NULL pointer dereference in blk_mq_map_swqueue (2)

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syzbot

unread,

Jan 28, 2020, 11:42:10 PM1/28/20

to syzkaller...@googlegroups.com

Hello,

syzbot found the following crash on:

HEAD commit: 9a95f252 Linux 4.14.168
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=119bbb76e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=95dfa265154d35c3
dashboard link: https://syzkaller.appspot.com/bug?extid=a1d2892b0b96e832a410
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a1d289...@syzkaller.appspotmail.com

RAX: ffffffffffffffda RBX: 00007f21d55f76d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00000000000003fd R14: 00000000004c549d R15: 0000000000000008
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+0x25e/0x9c0 block/blk-mq.c:2171
PGD a907a067 P4D a907a067 PUD 82df2067 PMD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2721 Comm: syz-executor.4 Not tainted 4.14.168-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888050e5c6c0 task.stack: ffff88804ccb0000
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+0x25e/0x9c0 block/blk-mq.c:2171
RSP: 0018:ffff88804ccb7a48 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90005b3c000
RDX: 0000000000000000 RSI: ffffffff82ffbb7a RDI: ffff8880a43cf748
RBP: ffff88804ccb7ac0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffff88804ccb78e0 R12: 0000000000000001
R13: ffff8880a43dbd00 R14: dffffc0000000000 R15: ffff8880a3c8f030
FS: 00007f21d55f7700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000120 CR3: 000000008aa91000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
blk_mq_queue_reinit block/blk-mq.c:2512 [inline]
__blk_mq_update_nr_hw_queues block/blk-mq.c:2746 [inline]
blk_mq_update_nr_hw_queues+0x21c/0x3a0 block/blk-mq.c:2756
nbd_start_device+0x1d7/0xc50 drivers/block/nbd.c:1187
nbd_start_device_ioctl drivers/block/nbd.c:1228 [inline]
__nbd_ioctl drivers/block/nbd.c:1310 [inline]
nbd_ioctl+0x43d/0xb30 drivers/block/nbd.c:1350
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x95f/0x1850 block/ioctl.c:594
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b349
RSP: 002b:00007f21d55f6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f21d55f76d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00000000000003fd R14: 00000000004c549d R15: 0000000000000008
Code: ea 03 42 80 3c 32 00 0f 85 94 06 00 00 41 83 fc 3f 48 8b 17 0f 87 4b 04 00 00 48 89 55 c8 48 89 45 d0 e8 26 59 5d fe 48 8b 55 c8 <f0> 48 0f ab 9a 20 01 00 00 48 8d ba 78 01 00 00 48 8b 45 d0 48
RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff88804ccb7a48
RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff88804ccb7a48
RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff88804ccb7a48
CR2: 0000000000000120
---[ end trace 8476beb611425dc8 ]---

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

Jan 29, 2020, 12:05:11 AM1/29/20

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following crash on:

HEAD commit: 9a95f252 Linux 4.14.168
git tree: linux-4.14.y

console output: https://syzkaller.appspot.com/x/log.txt?x=139d2bc9e00000

kernel config: https://syzkaller.appspot.com/x/.config?x=95dfa265154d35c3
dashboard link: https://syzkaller.appspot.com/bug?extid=a1d2892b0b96e832a410
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=129ecf66e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f99bc9e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a1d289...@syzkaller.appspotmail.com

__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x95f/0x1850 block/ioctl.c:594
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684

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+0x25e/0x9c0 block/blk-mq.c:2171

SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692

PGD a82be067
P4D a82be067
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
PUD 9b8ff067
PMD 0
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x44a7c9

Oops: 0002 [#1] PREEMPT SMP KASAN

RSP: 002b:00007f406a60dcb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Modules linked in:
RAX: ffffffffffffffda RBX: 00007f406a60dcc0 RCX: 000000000044a7c9
CPU: 1 PID: 7370 Comm: syz-executor641 Not tainted 4.14.168-syzkaller #0

RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000039
task: ffff8880a7b866c0 task.stack: ffff888092d38000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c

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+0x25e/0x9c0 block/blk-mq.c:2171

R13: 00007ffeba1d255f R14: 00007f406a60e9c0 R15: 0000000000000000
RSP: 0018:ffff888092d3fa48 EFLAGS: 00010297
RAX: ffff8880a7b866c0 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880a41eb440 RDI: ffff8880a41eb448
RBP: ffff888092d3fac0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffff888092d3f8e0 R12: 0000000000000001
R13: ffff8880a41f7580 R14: dffffc0000000000 R15: ffff8880a4372440
FS: 00007f406a60e700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000120 CR3: 00000000a8e0d000 CR4: 00000000001406e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
blk_mq_queue_reinit block/blk-mq.c:2512 [inline]
__blk_mq_update_nr_hw_queues block/blk-mq.c:2746 [inline]
blk_mq_update_nr_hw_queues+0x21c/0x3a0 block/blk-mq.c:2756
nbd_start_device+0x1d7/0xc50 drivers/block/nbd.c:1187
nbd_start_device_ioctl drivers/block/nbd.c:1228 [inline]
__nbd_ioctl drivers/block/nbd.c:1310 [inline]
nbd_ioctl+0x43d/0xb30 drivers/block/nbd.c:1350
__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x95f/0x1850 block/ioctl.c:594
block_ioctl+0xde/0x120 fs/block_dev.c:1881
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

RIP: 0033:0x44a7c9
RSP: 002b:00007f406a60dcb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f406a60dcc0 RCX: 000000000044a7c9

RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005

RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000039
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c
R13: 00007ffeba1d255f R14: 00007f406a60e9c0 R15: 0000000000000000

Code: ea 03 42 80 3c 32 00 0f 85 94 06 00 00 41 83 fc 3f 48 8b 17 0f 87 4b 04 00 00 48 89 55 c8 48 89 45 d0 e8 26 59 5d fe 48 8b 55 c8 <f0> 48 0f ab 9a 20 01 00 00 48 8d ba 78 01 00 00 48 8b 45 d0 48

RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff888092d3fa48
RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff888092d3fa48
RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff888092d3fa48
CR2: 0000000000000120

BUG: unable to handle kernel NULL pointer dereference at 0000000000000120

CPU: 1 PID: 7378 Comm: syz-executor641 Tainted: G D 4.14.168-syzkaller #0

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+0x25e/0x9c0 block/blk-mq.c:2171

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

PGD a039e067
Call Trace:
P4D a039e067
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x142/0x197 lib/dump_stack.c:58
PUD 9738b067
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0x10f/0x159 lib/fault-inject.c:149
PMD 0
should_failslab+0xdb/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc_node mm/slab.c:3297 [inline]
kmem_cache_alloc_node_trace+0x280/0x770 mm/slab.c:3659
Oops: 0002 [#2] PREEMPT SMP KASAN
Modules linked in:
__do_kmalloc_node mm/slab.c:3681 [inline]
__kmalloc_node+0x3d/0x80 mm/slab.c:3689
CPU: 0 PID: 7369 Comm: syz-executor641 Tainted: G D 4.14.168-syzkaller #0
kmalloc_node include/linux/slab.h:530 [inline]
kzalloc_node include/linux/slab.h:672 [inline]
blk_mq_realloc_hw_ctxs+0x1bf/0xe80 block/blk-mq.c:2364

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

__blk_mq_update_nr_hw_queues block/blk-mq.c:2745 [inline]
blk_mq_update_nr_hw_queues+0x1c9/0x3a0 block/blk-mq.c:2756
task: ffff88807f0cc080 task.stack: ffff88808fa60000
nbd_start_device+0x1d7/0xc50 drivers/block/nbd.c:1187

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+0x25e/0x9c0 block/blk-mq.c:2171

nbd_start_device_ioctl drivers/block/nbd.c:1228 [inline]
__nbd_ioctl drivers/block/nbd.c:1310 [inline]
nbd_ioctl+0x43d/0xb30 drivers/block/nbd.c:1350

RSP: 0018:ffff88808fa67a48 EFLAGS: 00010297
RAX: ffff88807f0cc080 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880a43d2d00 RDI: ffff8880a43d2d08

__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x95f/0x1850 block/ioctl.c:594

RBP: ffff88808fa67ac0 R08: 0000000000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: ffff88808fa678e0 R12: 0000000000000001
R13: ffff8880a43cd840 R14: dffffc0000000000 R15: ffff8880a3c24480
block_ioctl+0xde/0x120 fs/block_dev.c:1881
FS: 00007f406a60e700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684

CR2: 0000000000000120 CR3: 000000008e249000 CR4: 00000000001406f0

SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692

nbd_start_device_ioctl drivers/block/nbd.c:1228 [inline]
__nbd_ioctl drivers/block/nbd.c:1310 [inline]
nbd_ioctl+0x43d/0xb30 drivers/block/nbd.c:1350

do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

__blkdev_driver_ioctl block/ioctl.c:297 [inline]
blkdev_ioctl+0x95f/0x1850 block/ioctl.c:594

RIP: 0033:0x44a7c9
RSP: 002b:00007f406a60dcb8 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f406a60dcc0 RCX: 000000000044a7c9
block_ioctl+0xde/0x120 fs/block_dev.c:1881

RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005

RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000039

vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684

R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c
R13: 00007ffeba1d255f R14: 00007f406a60e9c0 R15: 0000000000000000

SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

RIP: 0033:0x44a7c9
RSP: 002b:00007f406a60dcb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f406a60dcc0 RCX: 000000000044a7c9

RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005

RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000039
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c
R13: 00007ffeba1d255f R14: 00007f406a60e9c0 R15: 0000000000000000

Code: ea 03 42 80 3c 32 00 0f 85 94 06 00 00 41 83 fc 3f 48 8b 17 0f 87 4b 04 00 00 48 89 55 c8 48 89 45 d0 e8 26 59 5d fe 48 8b 55 c8 <f0> 48 0f ab 9a 20 01 00 00 48 8d ba 78 01 00 00 48 8b 45 d0 48

RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff88808fa67a48
RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff88808fa67a48
RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff88808fa67a48
CR2: 0000000000000120

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+0x25e/0x9c0 block/blk-mq.c:2171

PGD 8d3e4067 P4D 8d3e4067 PUD 8c541067 PMD 0
Oops: 0002 [#3] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7387 Comm: syz-executor641 Tainted: G D 4.14.168-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

task: ffff88808da5e180 task.stack: ffff8880a50d8000

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+0x25e/0x9c0 block/blk-mq.c:2171

RSP: 0018:ffff8880a50dfa48 EFLAGS: 00010297
RAX: ffff88808da5e180 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880a43d2480 RDI: ffff8880a43d2488
RBP: ffff8880a50dfac0 R08: 0000000000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: ffff8880a50df8e0 R12: 0000000000000001
R13: ffff888218feea00 R14: dffffc0000000000 R15: ffff8880a3cc64c0
FS: 00007f406a60e700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000120 CR3: 00000000a8e14000 CR4: 00000000001406e0

RIP: 0033:0x44a7c9
RSP: 002b:00007f406a60dcb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f406a60dcc0 RCX: 000000000044a7c9

RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005

RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000039
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c
R13: 00007ffeba1d255f R14: 00007f406a60e9c0 R15: 0000000000000000

Code: ea 03 42 80 3c 32 00 0f 85 94 06 00 00 41 83 fc 3f 48 8b 17 0f 87 4b 04 00 00 48 89 55 c8 48 89 45 d0 e8 26 59 5d fe 48 8b 55 c8 <f0> 48 0f ab 9a 20 01 00 00 48 8d ba 78 01 00 00 48 8b 45 d0 48

RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff8880a50dfa48
RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff8880a50dfa48
RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff8880a50dfa48
CR2: 0000000000000120

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+0x25e/0x9c0 block/blk-mq.c:2171

PGD a836e067 P4D a836e067 PUD 99571067 PMD 0
Oops: 0002 [#4] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7384 Comm: syz-executor641 Tainted: G D 4.14.168-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

task: ffff88809b3700c0 task.stack: ffff888081e78000

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+0x25e/0x9c0 block/blk-mq.c:2171

RSP: 0018:ffff888081e7fa48 EFLAGS: 00010297
RAX: ffff88809b3700c0 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880a41eb000 RDI: ffff8880a41eb008
RBP: ffff888081e7fac0 R08: 0000000000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: ffff888081e7f8e0 R12: 0000000000000001
R13: ffff888218fee500 R14: dffffc0000000000 R15: ffff8880a3c24ff0
FS: 00007f406a60e700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000120 CR3: 0000000098855000 CR4: 00000000001406f0

RIP: 0033:0x44a7c9
RSP: 002b:00007f406a60dcb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f406a60dcc0 RCX: 000000000044a7c9

RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005

RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000039
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc6c
R13: 00007ffeba1d255f R14: 00007f406a60e9c0 R15: 0000000000000000

Code: ea 03 42 80 3c 32 00 0f 85 94 06 00 00 41 83 fc 3f 48 8b 17 0f 87 4b 04 00 00 48 89 55 c8 48 89 45 d0 e8 26 59 5d fe 48 8b 55 c8 <f0> 48 0f ab 9a 20 01 00 00 48 8d ba 78 01 00 00 48 8b 45 d0 48

RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff888081e7fa48
RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff888081e7fa48
RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff888081e7fa48
CR2: 0000000000000120

BUG: unable to handle kernel NULL pointer dereference at 0000000000000120

---[ end trace 052934a9dbd92cde ]---

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+0x25e/0x9c0 block/blk-mq.c:2171

PGD 9337d067 P4D 9337d067 PUD a9883067 PMD 0
Oops: 0002 [#5] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7378 Comm: syz-executor641 Tainted: G D 4.14.168-syzkaller #0

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