block nbd0: NBD_DISCONNECT
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7958 Comm: syz-executor241 Not tainted 4.14.218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809a896200 task.stack: ffff888094fc0000
RIP: 0010:__lock_acquire+0x1cc/0x3f20 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3369
RSP: 0018:ffff888094fc73b0 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000110
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88809a896200 R12: 0000000000000110
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8beb4d40
FS:  00000000015ab300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 0000000099bc0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x170/0x3f0 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3998
 flush_workqueue+0xfa/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2624
 nbd_disconnect_and_put+0xc3/0x140 syzkaller/managers/linux-4-14/kernel/drivers/block/nbd.c:1902
 nbd_genl_disconnect+0x1fa/0x320 syzkaller/managers/linux-4-14/kernel/drivers/block/nbd.c:1940
 genl_family_rcv_msg+0x572/0xb20 syzkaller/managers/linux-4-14/kernel/net/netlink/genetlink.c:600
 genl_rcv_msg+0xaf/0x140 syzkaller/managers/linux-4-14/kernel/net/netlink/genetlink.c:625
 netlink_rcv_skb+0x125/0x390 syzkaller/managers/linux-4-14/kernel/net/netlink/af_netlink.c:2433
 genl_rcv+0x24/0x40 syzkaller/managers/linux-4-14/kernel/net/netlink/genetlink.c:636
 netlink_unicast_kernel syzkaller/managers/linux-4-14/kernel/net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x610 syzkaller/managers/linux-4-14/kernel/net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x62e/0xb80 syzkaller/managers/linux-4-14/kernel/net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec syzkaller/managers/linux-4-14/kernel/net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 syzkaller/managers/linux-4-14/kernel/net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 syzkaller/managers/linux-4-14/kernel/net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 syzkaller/managers/linux-4-14/kernel/net/socket.c:2096
 SYSC_sendmsg syzkaller/managers/linux-4-14/kernel/net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 syzkaller/managers/linux-4-14/kernel/net/socket.c:2103
 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x444099
RSP: 002b:00007ffd2ac49d68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004004b8 RCX: 0000000000444099
RDX: 0000000000004800 RSI: 0000000020000240 RDI: 0000000000000004
RBP: 00000000004036c0 R08: 0000000000000001 R09: 00000000004004b8
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000403750
R13: 0000000000000000 R14: 00000000004b1018 R15: 00000000004004b8
Code: 18 00 00 00 00 48 81 c4 80 01 00 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 2a 00 00 49 81 3c 24 a0 07 2e 8b 0f 84 5f 
RIP: __lock_acquire+0x1cc/0x3f20 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3369 RSP: ffff888094fc73b0
---[ end trace 98020a71bf72c082 ]---