RBP: 00007fa087d001d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdcb7f2d5f R14: 00007fa087d00300 R15: 0000000000022000 BUG: unable to handle kernel NULL pointer dereference at 0000000000000118 PGD 4d88c067 P4D 4d88c067 PUD b2c2f067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5508 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022 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+0x287/0xa20 block/blk-mq.c:2355 Code: c1 ea 03 80 3c 1a 00 0f 85 cf 06 00 00 89 ee bf 07 00 00 00 4d 8b 3f e8 47 04 fd fd 83 fd 07 0f 87 04 05 00 00 e8 c9 02 fd fd 4d 0f ab b7 18 01 00 00 49 8d bf 74 01 00 00 48 89 fa 48 c1 ea RSP: 0018:ffff88804d667920 EFLAGS: 00010246 RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90008e61000 RDX: 0000000000040000 RSI: ffffffff836582a7 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ae0db080 R13: ffffe8ffffd39700 R14: 0000000000000001 R15: 0000000000000000 FS: 00007fa087d00700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000118 CR3: 00000000a1b5d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_mq_queue_reinit block/blk-mq.c:2697 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:3018 [inline] blk_mq_update_nr_hw_queues+0x5bb/0xb50 block/blk-mq.c:3032 nbd_start_device+0x1f2/0xd60 drivers/block/nbd.c:1214 nbd_start_device_ioctl drivers/block/nbd.c:1265 [inline] __nbd_ioctl drivers/block/nbd.c:1347 [inline] nbd_ioctl+0x62c/0xbe0 drivers/block/nbd.c:1387 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x5cb/0x1a80 block/ioctl.c:601 block_ioctl+0xe9/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa08938c649 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa087d00168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa08949df80 RCX: 00007fa08938c649 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 00007fa087d001d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdcb7f2d5f R14: 00007fa087d00300 R15: 0000000000022000 Modules linked in: CR2: 0000000000000118 ---[ end trace 4599f7703e208d9d ]--- 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+0x287/0xa20 block/blk-mq.c:2355 Code: c1 ea 03 80 3c 1a 00 0f 85 cf 06 00 00 89 ee bf 07 00 00 00 4d 8b 3f e8 47 04 fd fd 83 fd 07 0f 87 04 05 00 00 e8 c9 02 fd fd 4d 0f ab b7 18 01 00 00 49 8d bf 74 01 00 00 48 89 fa 48 c1 ea RSP: 0018:ffff88804d667920 EFLAGS: 00010246 RAX: 0000000000040000 RBX: dffffc0000000000 RCX: ffffc90008e61000 RDX: 0000000000040000 RSI: ffffffff836582a7 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ae0db080 R13: ffffe8ffffd39700 R14: 0000000000000001 R15: 0000000000000000 FS: 00007fa087d00700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000118 CR3: 00000000a1b5d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c1 ea 03 shr $0x3,%edx 3: 80 3c 1a 00 cmpb $0x0,(%rdx,%rbx,1) 7: 0f 85 cf 06 00 00 jne 0x6dc d: 89 ee mov %ebp,%esi f: bf 07 00 00 00 mov $0x7,%edi 14: 4d 8b 3f mov (%r15),%r15 17: e8 47 04 fd fd callq 0xfdfd0463 1c: 83 fd 07 cmp $0x7,%ebp 1f: 0f 87 04 05 00 00 ja 0x529 25: e8 c9 02 fd fd callq 0xfdfd02f3 * 2a: f0 4d 0f ab b7 18 01 lock bts %r14,0x118(%r15) <-- trapping instruction 31: 00 00 33: 49 8d bf 74 01 00 00 lea 0x174(%r15),%rdi 3a: 48 89 fa mov %rdi,%rdx 3d: 48 rex.W 3e: c1 .byte 0xc1 3f: ea (bad)