BUG: unable to handle kernel NULL pointer dereference at 0000000000000118
PGD 99674067 P4D 99674067 PUD 82030067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 31686 Comm: syz-executor.3 Not tainted 4.19.64 #38
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 e9 06 00 00 44 89 e6 bf 3f 00 00 00 4d 8b 6d 00 e8 41 8e 56 fe 41 83 fc 3f 0f 87 17 05 00 00 e8 b2 8c 56 fe <f0> 4d 0f ab b5 18 01 00 00 49 8d bd 74 01 00 00 48 89 fa 48 c1 ea
chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19
RSP: 0018:ffff88808414f8c0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc9000e48a000
RDX: 0000000000040000 RSI: ffffffff8314b8be RDI: 0000000000000005
RBP: ffff88808414f930 R08: ffff88806fef4040 R09: 0000000000000000
R10: ffffed1008679ff0 R11: ffff8880433cff83 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a423c040
FS:  00007fa52a370700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000118 CR3: 000000005b464000 CR4: 00000000001406e0
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+0x40d/0xc60 drivers/block/nbd.c:1307
caif:caif_disconnect_client(): nothing to disconnect
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0xc38/0x1ab6 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+0xd5f/0x1380 fs/ioctl.c:688
kobject: 'loop2' (0000000093c39409): 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+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
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:00007fa52a36fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa52a36fc90 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa52a3706d4
R13: 00000000004c3106 R14: 00000000004d6768 R15: 0000000000000006
Modules linked in:
CR2: 0000000000000118
kobject: 'loop2' (0000000093c39409): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'loop1' (00000000413b8250): kobject_uevent_env
kobject: 'loop1' (00000000413b8250): fill_kobj_path: path = '/devices/virtual/block/loop1'
chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT
---[ end trace 0cea01c9ab38a28d ]---
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 41 8e 56 fe 41 83 fc 3f 0f 87 17 05 00 00 e8 b2 8c 56 fe <f0> 4d 0f ab b5 18 01 00 00 49 8d bd 74 01 00 00 48 89 fa 48 c1 ea
chnl_net:chnl_net_open(): state disconnected
RSP: 0018:ffff88808414f8c0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc9000e48a000
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
RDX: 0000000000040000 RSI: ffffffff8314b8be RDI: 0000000000000005
RBP: ffff88808414f930 R08: ffff88806fef4040 R09: 0000000000000000
R10: ffffed1008679ff0 R11: ffff8880433cff83 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a423c040
FS:  00007fa52a370700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000738000 CR3: 000000005b464000 CR4: 00000000001406f0
kobject: 'loop2' (0000000093c39409): kobject_uevent_env
kobject: 'loop2' (0000000093c39409): fill_kobj_path: path = '/devices/virtual/block/loop2'