RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0e923c06d4
R13: 00000000004c3166 R14: 00000000004d68c8 R15: 0000000000000007
BUG: unable to handle kernel NULL pointer dereference at 0000000000000118
PGD 998a6067 P4D 998a6067 PUD 89ad5067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7891 Comm: syz-executor.0 Not tainted 4.19.67 #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'loop2' (000000005deae58d): kobject_uevent_env
RIP: 0010:set_bit arch/x86/include/asm/bitops.h:76 [inline]
RIP: 0010:cpumask_set_cpu include/linux/cpumask.h:311 [inline]
RIP: 0010:blk_mq_map_swqueue+0x29e/0xa60 block/blk-mq.c:2345
Code: 80 3c 18 00 0f 85 e9 06 00 00 44 89 e6 bf 3f 00 00 00 4d 8b 6d 00 e8 a1 93 56 fe 41 83 fc 3f 0f 87 17 05 00 00 e8 12 92 56 fe <f0> 4d 0f ab b5 18 01 00 00 49 8d bd 74 01 00 00 48 89 fa 48 c1 ea
RSP: 0018:ffff8880982078c0 EFLAGS: 00010246
kobject: 'loop2' (000000005deae58d): fill_kobj_path: path = '/devices/virtual/block/loop2'
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90005e7f000
RDX: 0000000000040000 RSI: ffffffff8314cd1e RDI: 0000000000000005
RBP: ffff888098207930 R08: ffff888053bf8540 R09: 0000000000000000
R10: ffffed101435dff0 R11: ffff8880a1aeff83 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a41870c0
FS:  00007f0e923c0700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000118 CR3: 000000009b549000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 blk_mq_queue_reinit block/blk-mq.c:2686 [inline]
 __blk_mq_update_nr_hw_queues block/blk-mq.c:3007 [inline]
 blk_mq_update_nr_hw_queues+0x5ab/0xb70 block/blk-mq.c:3021
 nbd_start_device+0x15e/0xbb0 drivers/block/nbd.c:1155
 nbd_start_device_ioctl drivers/block/nbd.c:1196 [inline]
 __nbd_ioctl drivers/block/nbd.c:1267 [inline]
 nbd_ioctl+0x412/0xc60 drivers/block/nbd.c:1307
kobject: 'loop1' (000000008ca66c9e): kobject_uevent_env
kobject: 'loop1' (000000008ca66c9e): fill_kobj_path: path = '/devices/virtual/block/loop1'
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0xc38/0x1ab6 block/ioctl.c:601
kobject: 'loop3' (00000000b8bb909c): kobject_uevent_env
 block_ioctl+0xee/0x130 fs/block_dev.c:1891
kobject: 'loop3' (00000000b8bb909c): fill_kobj_path: path = '/devices/virtual/block/loop3'
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0e923bfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0e923bfc90 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0e923c06d4
R13: 00000000004c3166 R14: 00000000004d68c8 R15: 0000000000000007
Modules linked in:
CR2: 0000000000000118
---[ end trace b6914fd563d3c786 ]---
kobject: 'loop5' (0000000073ca9b1f): kobject_uevent_env
RIP: 0010:set_bit arch/x86/include/asm/bitops.h:76 [inline]
RIP: 0010:cpumask_set_cpu include/linux/cpumask.h:311 [inline]
RIP: 0010:blk_mq_map_swqueue+0x29e/0xa60 block/blk-mq.c:2345
kobject: 'loop5' (0000000073ca9b1f): fill_kobj_path: path = '/devices/virtual/block/loop5'
Code: 80 3c 18 00 0f 85 e9 06 00 00 44 89 e6 bf 3f 00 00 00 4d 8b 6d 00 e8 a1 93 56 fe 41 83 fc 3f 0f 87 17 05 00 00 e8 12 92 56 fe <f0> 4d 0f ab b5 18 01 00 00 49 8d bd 74 01 00 00 48 89 fa 48 c1 ea
RSP: 0018:ffff8880982078c0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90005e7f000
RDX: 0000000000040000 RSI: ffffffff8314cd1e RDI: 0000000000000005
RBP: ffff888098207930 R08: ffff888053bf8540 R09: 0000000000000000
R10: ffffed101435dff0 R11: ffff8880a1aeff83 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a41870c0
FS:  00007f0e923c0700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000007126b4 CR3: 000000009b549000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400