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
CPU: 0 PID: 8062 Comm: syz-executor754 Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x1eb/0x3ff0 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:3294
Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 20 72 66 8c 0f 84 65 ff ff
RSP: 0018:ffff8880979ef270 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b3e1e580 R14: 0000000000000110 R15: 0000000000000001
FS:  0000000001ac7300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 00000000985c9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x170/0x3c0 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:3907
 flush_workqueue+0x117/0x13e0 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:2663
 nbd_disconnect_and_put+0x100/0x190 syzkaller/managers/linux-4-19/kernel/drivers/block/nbd.c:1920
 nbd_genl_disconnect+0x34f/0x4f0 syzkaller/managers/linux-4-19/kernel/drivers/block/nbd.c:1958
 genl_family_rcv_msg+0x642/0xc40 syzkaller/managers/linux-4-19/kernel/net/netlink/genetlink.c:602
 genl_rcv_msg+0xbf/0x160 syzkaller/managers/linux-4-19/kernel/net/netlink/genetlink.c:627
 netlink_rcv_skb+0x160/0x440 syzkaller/managers/linux-4-19/kernel/net/netlink/af_netlink.c:2455
 genl_rcv+0x24/0x40 syzkaller/managers/linux-4-19/kernel/net/netlink/genetlink.c:638
 netlink_unicast_kernel syzkaller/managers/linux-4-19/kernel/net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d5/0x690 syzkaller/managers/linux-4-19/kernel/net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6bb/0xc40 syzkaller/managers/linux-4-19/kernel/net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec syzkaller/managers/linux-4-19/kernel/net/socket.c:622 [inline]
 sock_sendmsg+0xc3/0x120 syzkaller/managers/linux-4-19/kernel/net/socket.c:632
 ___sys_sendmsg+0x7bb/0x8e0 syzkaller/managers/linux-4-19/kernel/net/socket.c:2115
 __sys_sendmsg syzkaller/managers/linux-4-19/kernel/net/socket.c:2153 [inline]
 __do_sys_sendmsg syzkaller/managers/linux-4-19/kernel/net/socket.c:2162 [inline]
 __se_sys_sendmsg syzkaller/managers/linux-4-19/kernel/net/socket.c:2160 [inline]
 __x64_sys_sendmsg+0x132/0x220 syzkaller/managers/linux-4-19/kernel/net/socket.c:2160
 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x444099
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd66d4808 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
Modules linked in:
---[ end trace c0fec614c858e19b ]---
RIP: 0010:__lock_acquire+0x1eb/0x3ff0 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:3294
Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 20 72 66 8c 0f 84 65 ff ff
RSP: 0018:ffff8880979ef270 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b3e1e580 R14: 0000000000000110 R15: 0000000000000001
FS:  0000000001ac7300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 00000000985c9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400