syzbot


BUG: unable to handle kernel paging request in vsock_diag_dump

Status: fixed on 2017/11/28 03:36
Subsystems: net virt
[Documentation on labels]
Reported-by: syzbot+d6b6d5e0ac5609c835098f88c893a7bb3cfa0900@syzkaller.appspotmail.com
Fix commit: c1eef220c176 vsock: always call vsock_init_tables()
First crash: 2478d, last: 2459d

Sample crash report:
IP: read_pnet include/net/net_namespace.h:269 [inline]
IP: sock_net include/net/sock.h:2299 [inline]
IP: vsock_diag_dump+0x290/0xa80 net/vmw_vsock/diag.c:87
PGD 21fff4067 P4D 21fff4067 PUD 21fff3067 PMD 21fff2067 PTE 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 2986 Comm: syzkaller165749 Not tainted 4.14.0-rc3+ #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801ceaaa1c0 task.stack: ffff8801ce0e0000
RIP: 0010:read_pnet include/net/net_namespace.h:269 [inline]
RIP: 0010:sock_net include/net/sock.h:2299 [inline]
RIP: 0010:vsock_diag_dump+0x290/0xa80 net/vmw_vsock/diag.c:87
RSP: 0018:ffff8801ce0e73d0 EFLAGS: 00010a02
RAX: 1fffffffffffff70 RBX: fffffffffffffb50 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff83f09694 RDI: fffffffffffffb80
RBP: ffff8801ce0e74e0 R08: ffff8801ce0e6d20 R09: ffff8801ce0e6d18
R10: ffff8801ce0e6c90 R11: 1ffff10039d556cb R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff87962d20 R15: ffff8801ce0e74b8
FS:  000000000152a880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbffffffff70 CR3: 00000001ce70f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 netlink_dump+0x46b/0xb90 net/netlink/af_netlink.c:2186
 __netlink_dump_start+0x4e9/0x710 net/netlink/af_netlink.c:2278
 netlink_dump_start include/linux/netlink.h:216 [inline]
 vsock_diag_handler_dump+0x206/0x2c0 net/vmw_vsock/diag.c:161
 __sock_diag_cmd net/core/sock_diag.c:231 [inline]
 sock_diag_rcv_msg+0x204/0x390 net/core/sock_diag.c:263
 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2408
 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274
 netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline]
 netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299
 netlink_sendmsg+0xa4a/0xe70 net/netlink/af_netlink.c:1862
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:643
 sock_write_iter+0x320/0x5e0 net/socket.c:912
 call_write_iter include/linux/fs.h:1770 [inline]
 do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:673
 do_iter_write+0x15a/0x540 fs/read_write.c:952
 vfs_writev+0x18a/0x340 fs/read_write.c:997
 do_writev+0xfc/0x2a0 fs/read_write.c:1032
 SYSC_writev fs/read_write.c:1105 [inline]
 SyS_writev+0x27/0x30 fs/read_write.c:1102
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x43fd69
RSP: 002b:00007fff5da11d98 EFLAGS: 00000203 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd69
RDX: 0000000000000001 RSI: 00000000206a3ff0 RDI: 0000000000000003
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016d0
R13: 0000000000401760 R14: 0000000000000000 R15: 0000000000000000
Code: 69 07 00 00 48 8b 83 b0 04 00 00 49 39 c6 48 8d 98 50 fb ff ff 0f 84 ce 03 00 00 e8 bb a2 9f fc 48 8d 7b 30 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 2d 07 00 00 48 8b 85 70 ff ff ff 48 3b 43 
RIP: read_pnet include/net/net_namespace.h:269 [inline] RSP: ffff8801ce0e73d0
RIP: sock_net include/net/sock.h:2299 [inline] RSP: ffff8801ce0e73d0
RIP: vsock_diag_dump+0x290/0xa80 net/vmw_vsock/diag.c:87 RSP: ffff8801ce0e73d0
CR2: fffffbffffffff70
---[ end trace 9852ce58edddbce7 ]---

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/10/09 07:41 net-next-old 28f50eb20931 c26ea367 .config console log report syz C ci-upstream-net-kasan-gce
2017/10/27 12:31 linux-next 36ef71cae353 e511d9f8 .config console log report syz C ci-upstream-next-kasan-gce
2017/10/24 18:39 net-next-old 49ca1943a7ad 92f543f0 .config console log report ci-upstream-net-kasan-gce
2017/10/16 10:24 net-next-old 833e0e2f24fd 441d64d9 .config console log report ci-upstream-net-kasan-gce
2017/10/09 07:15 net-next-old 28f50eb20931 c26ea367 .config console log report ci-upstream-net-kasan-gce
2017/10/24 22:51 mmots 0f611fb6dcc0 e0a2b195 .config console log report ci-upstream-mmots-kasan-gce
* Struck through repros no longer work on HEAD.