netlink: 36 bytes leftover after parsing attributes in process `syz-executor.2'.
BUG: spinlock bad magic on CPU#0, syz-executor.2/17686
 lock: 0xffff8880b9c00040, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 0 PID: 17686 Comm: syz-executor.2 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0xfa/0x151 lib/dump_stack.c:120
 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 do_raw_spin_lock+0x216/0x2b0 kernel/locking/spinlock_debug.c:112
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irqsave+0x41/0x50 kernel/locking/spinlock.c:159
 srcu_might_be_idle kernel/rcu/srcutree.c:772 [inline]
 synchronize_srcu+0x4f/0x1c0 kernel/rcu/srcutree.c:1010
 blk_mq_quiesce_queue+0x153/0x1d0 block/blk-mq.c:233
 elevator_init_mq+0x2d7/0x400 block/elevator.c:682
 __device_add_disk+0x8a6/0x1300 block/genhd.c:583
 add_disk include/linux/genhd.h:231 [inline]
 nbd_dev_add+0x720/0x910 drivers/block/nbd.c:1719
 nbd_genl_connect+0x557/0x1570 drivers/block/nbd.c:1829
 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:2502
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2348
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2402
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2435
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465ef9
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:00007ffb6e7f6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465ef9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 00000000004bfa0c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffd3355817f R14: 00007ffb6e7f6300 R15: 0000000000022000
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 17686 Comm: syz-executor.2 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_segcblist_enqueue+0xb9/0x130 kernel/rcu/rcu_segcblist.c:349
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 21 48 89 75 00 48 89 73 20 48 83 c4 08 5b 5d c3 48
RSP: 0018:ffffc90008f0f0e8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880b9c00080 RCX: ffffffff81595920
RDX: 0000000000000000 RSI: ffffc90008f0f1d0 RDI: ffff8880b9c000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520011e1e0f R11: 0000000000000000 R12: ffffc90008f0f1d0
R13: ffff8880b9c00080 R14: 0000000000000000 R15: ffff8880b9c00040
FS:  00007ffb6e7f6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd1fe2ba17 CR3: 0000000073dea000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 srcu_gp_start_if_needed+0x116/0xbc0 kernel/rcu/srcutree.c:828
 __call_srcu kernel/rcu/srcutree.c:888 [inline]
 __synchronize_srcu+0x1d1/0x280 kernel/rcu/srcutree.c:934
 blk_mq_quiesce_queue+0x153/0x1d0 block/blk-mq.c:233
 elevator_init_mq+0x2d7/0x400 block/elevator.c:682
 __device_add_disk+0x8a6/0x1300 block/genhd.c:583
 add_disk include/linux/genhd.h:231 [inline]
 nbd_dev_add+0x720/0x910 drivers/block/nbd.c:1719
 nbd_genl_connect+0x557/0x1570 drivers/block/nbd.c:1829
 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:2502
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2348
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2402
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2435
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465ef9
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:00007ffb6e7f6188 EFLAGS: 00000246
 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465ef9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 00000000004bfa0c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffd3355817f R14: 00007ffb6e7f6300 R15: 0000000000022000
Modules linked in:
---[ end trace 0a99bc104c53fb9a ]---
RIP: 0010:rcu_segcblist_enqueue+0xb9/0x130 kernel/rcu/rcu_segcblist.c:349
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 21 48 89 75 00 48 89 73 20 48 83 c4 08 5b 5d c3 48
RSP: 0018:ffffc90008f0f0e8 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880b9c00080 RCX: ffffffff81595920
RDX: 0000000000000000 RSI: ffffc90008f0f1d0 RDI: ffff8880b9c000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520011e1e0f R11: 0000000000000000 R12: ffffc90008f0f1d0
R13: ffff8880b9c00080 R14: 0000000000000000 R15: ffff8880b9c00040
FS:  00007ffb6e7f6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd1fe2ba17 CR3: 0000000073dea000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400