netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 9512 Comm: syz-executor.1 Tainted: G W 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:blk_mq_map_queue_type block/blk-mq.h:96 [inline] RIP: 0010:blk_mq_get_sq_hctx block/blk-mq.c:1663 [inline] RIP: 0010:blk_mq_run_hw_queues+0x32b/0x4a0 block/blk-mq.c:1682 Code: ea 48 c1 ea 03 80 3c 02 00 0f 85 51 01 00 00 48 8b 45 00 89 db 48 8d 1c 98 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ed RSP: 0018:ffffc900016af3a8 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000004 RCX: ffffc9000b375000 RDX: 0000000000000000 RSI: ffffffff83c2c0b9 RDI: ffff88801e5b89d0 RBP: ffff88801e4c6000 R08: 0000000000000000 R09: ffff88801e5b8947 R10: ffffffff83c2bef1 R11: 0000000000000000 R12: ffff88801e5b8000 R13: ffff8881463d6bb8 R14: 0000000000000001 R15: ffff88802636b008 FS: 00007fe3d3e53700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000568000 CR3: 00000000571e7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_freeze_queue_start+0xc4/0xe0 block/blk-mq.c:142 blk_set_queue_dying+0x24/0x80 block/blk-core.c:351 blk_cleanup_queue+0x7b/0x1e0 block/blk-core.c:378 blk_cleanup_disk+0x33/0x80 block/genhd.c:1324 nbd_dev_remove drivers/block/nbd.c:243 [inline] nbd_put.part.0+0x92/0x160 drivers/block/nbd.c:263 nbd_put drivers/block/nbd.c:1909 [inline] nbd_genl_connect+0x1383/0x1820 drivers/block/nbd.c:1999 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe3d3e53188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000020000090 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcc5fd96ef R14: 00007fe3d3e53300 R15: 0000000000022000 Modules linked in: ---[ end trace 8517224e33f43032 ]--- RIP: 0010:blk_mq_map_queue_type block/blk-mq.h:96 [inline] RIP: 0010:blk_mq_get_sq_hctx block/blk-mq.c:1663 [inline] RIP: 0010:blk_mq_run_hw_queues+0x32b/0x4a0 block/blk-mq.c:1682 Code: ea 48 c1 ea 03 80 3c 02 00 0f 85 51 01 00 00 48 8b 45 00 89 db 48 8d 1c 98 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ed RSP: 0018:ffffc900016af3a8 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000004 RCX: ffffc9000b375000 RDX: 0000000000000000 RSI: ffffffff83c2c0b9 RDI: ffff88801e5b89d0 RBP: ffff88801e4c6000 R08: 0000000000000000 R09: ffff88801e5b8947 R10: ffffffff83c2bef1 R11: 0000000000000000 R12: ffff88801e5b8000 R13: ffff8881463d6bb8 R14: 0000000000000001 R15: ffff88802636b008 FS: 00007fe3d3e53700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4df872d010 CR3: 00000000571e7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400