RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f03a9f1b6d4 R13: 00000000004c21c8 R14: 00000000004d4aa8 R15: 0000000000000007 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 9e626067 P4D 9e626067 PUD 7cc68067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 18611 Comm: syz-executor.0 Not tainted 4.14.113 #3 kobject: '0:44' (ffff88807d75d690): kobject_add_internal: parent: 'bdi', set: 'devices' Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888097f546c0 task.stack: ffff88805c698000 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:ffff88805c69fa50 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90006c34000 RDX: 0000000000000000 RSI: ffffffff82c9cf8a RDI: ffff8880a48a68c8 RBP: ffff88805c69fac8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88805c69f8e8 R12: 0000000000000001 R13: ffff8880a48ae780 R14: dffffc0000000000 R15: ffff8880a4b60fb0 FS: 00007f03a9f1b700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000120 CR3: 00000000768b5000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kobject: '0:44' (ffff88807d75d690): kobject_uevent_env 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+0x12c/0xb00 drivers/block/nbd.c:1144 nbd_start_device_ioctl drivers/block/nbd.c:1185 [inline] __nbd_ioctl drivers/block/nbd.c:1256 [inline] nbd_ioctl+0x43e/0xae0 drivers/block/nbd.c:1296 kobject: '0:44' (ffff88807d75d690): fill_kobj_path: path = '/devices/virtual/bdi/0:44' __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x983/0x1880 block/ioctl.c:594 block_ioctl+0xde/0x120 fs/block_dev.c:1881 kobject: 'loop5' (ffff8880a4a4e1e0): kobject_uevent_env vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684 kobject: 'loop5' (ffff8880a4a4e1e0): fill_kobj_path: path = '/devices/virtual/block/loop5' SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458da9 RSP: 002b:00007f03a9f1ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f03a9f1ac90 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005 kobject: 'loop4' (ffff8880a4a172a0): kobject_uevent_env RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f03a9f1b6d4 R13: 00000000004c21c8 R14: 00000000004d4aa8 R15: 0000000000000007 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 76 17 93 fe 48 8b 55 c8 48 0f ab 9a 20 01 00 00 48 8d ba 78 01 00 00 48 8b 45 d0 48 kobject: 'loop4' (ffff8880a4a172a0): fill_kobj_path: path = '/devices/virtual/block/loop4' RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff88805c69fa50 RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff88805c69fa50 RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff88805c69fa50 CR2: 0000000000000120 ---[ end trace b181e87a5ba9a820 ]--- kobject: '0:44' (ffff88807d75d690): kobject_uevent_env kobject: '0:44' (ffff88807d75d690): fill_kobj_path: path = '/devices/virtual/bdi/0:44'