BUG: unable to handle kernel NULL pointer dereference at 0000000000000118 PGD 1c5397067 P4D 1c5397067 PUD 1cf6d0067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 13522 Comm: syz-executor3 Not tainted 4.19.0-rc6+ #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cpumask_set_cpu include/linux/cpumask.h:311 [inline] RIP: 0010:blk_mq_map_swqueue+0x29c/0xa70 block/blk-mq.c:2336 Code: 80 3c 1a 00 0f 85 fa 06 00 00 44 89 ee bf 3f 00 00 00 4d 8b 24 24 e8 93 2a 06 fe 41 83 fd 3f 0f 87 1c 05 00 00 e8 74 29 06 fe 4d 0f ab b4 24 18 01 00 00 49 8d bc 24 74 01 00 00 48 89 fa 48 RSP: 0018:ffff880187b3f4e0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90007f10000 RDX: 0000000000040000 RSI: ffffffff83788c0c RDI: 0000000000000005 RBP: ffff880187b3f550 R08: ffff88018473c0c0 R09: 0000000000000000 R10: ffffed003051bff0 R11: ffff8801828dff83 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000001 R15: ffff8801d1e87000 FS: 00007f1cbce43700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000118 CR3: 00000001bd026000 CR4: 00000000001406e0 Call Trace: blk_mq_queue_reinit block/blk-mq.c:2675 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:2994 [inline] blk_mq_update_nr_hw_queues+0xb2a/0xe50 block/blk-mq.c:3008 nbd_start_device+0x1d2/0xcd0 drivers/block/nbd.c:1154 nbd_start_device_ioctl drivers/block/nbd.c:1195 [inline] __nbd_ioctl drivers/block/nbd.c:1266 [inline] nbd_ioctl+0x6af/0xd40 drivers/block/nbd.c:1306 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9ac/0x2010 block/ioctl.c:601 block_ioctl+0xee/0x130 fs/block_dev.c:1883 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1cbce42c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1cbce42c90 RCX: 0000000000457579 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1cbce436d4 R13: 00000000004c04c1 R14: 00000000004d0660 R15: 0000000000000005 Modules linked in: CR2: 0000000000000118 kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop5' (000000009535997c): kobject_uevent_env kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'loop5' (000000009535997c): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' ---[ end trace ef74b0273fd06ea9 ]--- kobject: 'kvm' (000000004612a497): kobject_uevent_env RIP: 0010:cpumask_set_cpu include/linux/cpumask.h:311 [inline] RIP: 0010:blk_mq_map_swqueue+0x29c/0xa70 block/blk-mq.c:2336 kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): kobject_uevent_env Code: 80 3c 1a 00 0f 85 fa 06 00 00 44 89 ee bf 3f 00 00 00 4d 8b 24 24 e8 93 2a 06 fe 41 83 fd 3f 0f 87 1c 05 00 00 e8 74 29 06 fe 4d 0f ab b4 24 18 01 00 00 49 8d bc 24 74 01 00 00 48 89 fa 48 kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env RSP: 0018:ffff880187b3f4e0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90007f10000 kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'kvm' (000000004612a497): kobject_uevent_env RDX: 0000000000040000 RSI: ffffffff83788c0c RDI: 0000000000000005 kobject: 'kvm' (000000004612a497): fill_kobj_path: path = '/devices/virtual/misc/kvm' kobject: 'loop4' (00000000343e7014): kobject_uevent_env RBP: ffff880187b3f550 R08: ffff88018473c0c0 R09: 0000000000000000 kobject: 'loop4' (00000000343e7014): fill_kobj_path: path = '/devices/virtual/block/loop4' R10: ffffed003051bff0 R11: ffff8801828dff83 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000001 R15: ffff8801d1e87000 kobject: 'loop5' (000000009535997c): kobject_uevent_env FS: 00007f1cbce43700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 kobject: 'loop5' (000000009535997c): fill_kobj_path: path = '/devices/virtual/block/loop5' CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000706158 CR3: 00000001bd026000 CR4: 00000000001406f0