RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
llcp: llcp_sock_recvmsg: Recv datagram failed state 5 -107 0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ec9eaf6d4
R13: 00000000004c21c8 R14: 00000000004d4aa8 R15: 0000000000000007
BUG: unable to handle kernel NULL pointer dereference at 0000000000000118
kobject: 'loop4' (00000000b49cd264): fill_kobj_path: path = '/devices/virtual/block/loop4'
PGD 564ab067 P4D 564ab067 PUD a0e13067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 30242 Comm: syz-executor.0 Not tainted 4.19.36 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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 ef 06 00 00 44 89 e6 bf 3f 00 00 00 4d 8b 6d 00 e8 31 96 57 fe 41 83 fc 3f 0f 87 11 05 00 00 e8 a2 94 57 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:ffff8880600c78c0 EFLAGS: 00010246
kobject: 'loop1' (000000008d34670c): kobject_uevent_env
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90005e7f000
RDX: 0000000000040000 RSI: ffffffff8313b06e RDI: 0000000000000005
RBP: ffff8880600c7930 R08: ffff888089cd2500 R09: 0000000000000000
R10: ffffed100fd1fff0 R11: ffff88807e8fff83 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a430f0c0
FS:  00007f4ec9eaf700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000118 CR3: 00000000895f0000 CR4: 00000000001406f0
Call Trace:
kobject: 'loop1' (000000008d34670c): fill_kobj_path: path = '/devices/virtual/block/loop1'
 blk_mq_queue_reinit block/blk-mq.c:2684 [inline]
 __blk_mq_update_nr_hw_queues block/blk-mq.c:3003 [inline]
 blk_mq_update_nr_hw_queues+0x5ab/0xb70 block/blk-mq.c:3017
 nbd_start_device+0x15e/0xbb0 drivers/block/nbd.c:1155
kobject: 'loop3' (00000000be65745d): kobject_uevent_env
 nbd_start_device_ioctl drivers/block/nbd.c:1196 [inline]
 __nbd_ioctl drivers/block/nbd.c:1267 [inline]
 nbd_ioctl+0x413/0xc60 drivers/block/nbd.c:1307
kobject: 'loop3' (00000000be65745d): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'loop4' (00000000b49cd264): kobject_uevent_env
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0xc4b/0x1ae0 block/ioctl.c:601
 block_ioctl+0xee/0x130 fs/block_dev.c:1891
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:688
kobject: 'loop4' (00000000b49cd264): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop2' (00000000fd87a672): kobject_uevent_env
 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+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
kobject: 'loop2' (00000000fd87a672): fill_kobj_path: path = '/devices/virtual/block/loop2'
RIP: 0033:0x458da9
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4ec9eaec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4ec9eaec90 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ec9eaf6d4
R13: 00000000004c21c8 R14: 00000000004d4aa8 R15: 0000000000000007
Modules linked in:
CR2: 0000000000000118
---[ end trace aa39d1e343b2ea32 ]---
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 ef 06 00 00 44 89 e6 bf 3f 00 00 00 4d 8b 6d 00 e8 31 96 57 fe 41 83 fc 3f 0f 87 11 05 00 00 e8 a2 94 57 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:ffff8880600c78c0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90005e7f000
RDX: 0000000000040000 RSI: ffffffff8313b06e RDI: 0000000000000005
RBP: ffff8880600c7930 R08: ffff888089cd2500 R09: 0000000000000000
R10: ffffed100fd1fff0 R11: ffff88807e8fff83 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a430f0c0
FS:  00007f4ec9eaf700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000118 CR3: 00000000895f0000 CR4: 00000000001406f0