RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb0924816d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 0000000000000008 BUG: unable to handle kernel NULL pointer dereference at 0000000000000120 kobject: 'loop4' (ffff8880a4a5e1a0): kobject_uevent_env 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 a5d66067 P4D a5d66067 PUD 93bc6067 PMD 0 kobject: 'loop4' (ffff8880a4a5e1a0): fill_kobj_path: path = '/devices/virtual/block/loop4' Oops: 0002 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 9483 Comm: syz-executor.0 Not tainted 4.14.146 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888057c226c0 task.stack: ffff888085170000 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:ffff888085177a50 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90007c64000 RDX: 0000000000000000 RSI: ffffffff82ca0bca RDI: ffff8880a4b35b48 RBP: ffff888085177ac8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880851778e8 R12: 0000000000000001 R13: ffff8882192ed340 R14: dffffc0000000000 R15: ffff8880a4ba8fb0 FS: 00007fb092481700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000120 CR3: 00000000981fe000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_mq_queue_reinit block/blk-mq.c:2514 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:2748 [inline] blk_mq_update_nr_hw_queues+0x21c/0x3a0 block/blk-mq.c:2758 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+0x43d/0xae0 drivers/block/nbd.c:1296 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x96b/0x1860 block/ioctl.c:594 block_ioctl+0xde/0x120 fs/block_dev.c:1881 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459a29 RSP: 002b:00007fb092480c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb092480c90 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb0924816d4 R13: 00000000004c333c R14: 00000000004d6c60 R15: 0000000000000008 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 26 d7 92 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 RIP: set_bit arch/x86/include/asm/bitops.h:81 [inline] RSP: ffff888085177a50 RIP: cpumask_set_cpu include/linux/cpumask.h:283 [inline] RSP: ffff888085177a50 RIP: blk_mq_map_swqueue+0x25e/0x9c0 block/blk-mq.c:2171 RSP: ffff888085177a50 CR2: 0000000000000120 kobject: 'loop1' (ffff8880a49797e0): kobject_uevent_env kobject: 'loop1' (ffff8880a49797e0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'rx-0' (ffff8880a8c49610): kobject_cleanup, parent ffff8880a70c4848 kobject: 'rx-0' (ffff8880a8c49610): auto cleanup 'remove' event FAT-fs (loop1): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive! kobject: 'rx-0' (ffff8880a8c49610): kobject_uevent_env kobject: 'rx-0' (ffff8880a8c49610): kobject_uevent_env: uevent_suppress caused the event to drop! FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem kobject: 'rx-0' (ffff8880a8c49610): auto cleanup kobject_del kobject: 'rx-0' (ffff8880a8c49610): calling ktype release kobject: 'loop1' (ffff8880a49797e0): kobject_uevent_env kobject: 'rx-0': free name kobject: 'loop1' (ffff8880a49797e0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'tx-0' (ffff88808f9d7a98): kobject_cleanup, parent ffff8880a70c4848 kobject: 'tx-0' (ffff88808f9d7a98): auto cleanup 'remove' event kobject: 'tx-0' (ffff88808f9d7a98): kobject_uevent_env kobject: 'tx-0' (ffff88808f9d7a98): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop4' (ffff8880a4a5e1a0): kobject_uevent_env kobject: 'loop4' (ffff8880a4a5e1a0): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'tx-0' (ffff88808f9d7a98): auto cleanup kobject_del kobject: 'loop3' (ffff8880a4a29260): kobject_uevent_env kobject: 'loop3' (ffff8880a4a29260): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'tx-0' (ffff88808f9d7a98): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (ffff8880a70c4848): kobject_cleanup, parent (null) kobject: 'queues' (ffff8880a70c4848): calling ktype release kobject: 'queues' (ffff8880a70c4848): kset_release kobject: 'queues': free name ---[ end trace 57fd2da8a73cb400 ]--- kobject: 'ip6gre0' (ffff88805e7c87f0): kobject_uevent_env kobject: 'loop5' (ffff8880a4ab8aa0): kobject_uevent_env kobject: 'ip6gre0' (ffff88805e7c87f0): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop5' (ffff8880a4ab8aa0): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'ip6tnl1' (ffff888058f6e9f0): kobject_add_internal: parent: 'net', set: 'devices'