general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f] CPU: 1 PID: 10761 Comm: syz-executor.0 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xf2/0x6040 kernel/locking/lockdep.c:4772 Code: 89 bc 24 80 00 00 00 0f 85 fb 26 00 00 83 3d 18 9b b5 0c 00 0f 84 2f 12 00 00 83 3d 47 31 5d 0b 00 74 39 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 80 00 00 00 e8 1a 6f 64 00 48 8b RSP: 0018:ffffc9000a45ecc0 EFLAGS: 00010006 RAX: 0000000000000027 RBX: 0000000000000000 RCX: 1ffff9200148bdb8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000138 RBP: ffffc9000a45f050 R08: dffffc0000000000 R09: 0000000000000000 R10: fffffbfff1c2cd1e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f96854c6700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000014a53ad CR3: 00000000404e5000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5512 flush_workqueue+0x178/0x1750 kernel/workqueue.c:2786 nbd_disconnect_and_put+0x126/0x1f0 drivers/block/nbd.c:1983 nbd_genl_disconnect+0x3df/0x630 drivers/block/nbd.c:2021 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0xfb4/0x13c0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x1f0/0x460 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+0x7de/0x9b0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0xaa6/0xe90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0x5a2/0x900 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmsg+0x319/0x400 net/socket.c:2433 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 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:00007f96854c6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000004 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffef9ba6a5f R14: 00007f96854c6300 R15: 0000000000022000 Modules linked in: ---[ end trace b1c26b10919b60dd ]--- RIP: 0010:__lock_acquire+0xf2/0x6040 kernel/locking/lockdep.c:4772 Code: 89 bc 24 80 00 00 00 0f 85 fb 26 00 00 83 3d 18 9b b5 0c 00 0f 84 2f 12 00 00 83 3d 47 31 5d 0b 00 74 39 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 80 00 00 00 e8 1a 6f 64 00 48 8b RSP: 0018:ffffc9000a45ecc0 EFLAGS: 00010006 RAX: 0000000000000027 RBX: 0000000000000000 RCX: 1ffff9200148bdb8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000138 RBP: ffffc9000a45f050 R08: dffffc0000000000 R09: 0000000000000000 R10: fffffbfff1c2cd1e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f96854c6700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000014a53ad CR3: 00000000404e5000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400