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general protection fault in find_match

Status: upstream: reported C repro on 2019/10/23 12:46
Reported-by: syzbot+3e1695528a9f85ad3b77@syzkaller.appspotmail.com
First crash: 1886d, last: 1188d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in find_match net C done error 10 1770d 1957d 0/28 closed as invalid on 2020/04/17 19:54
upstream general protection fault in find_match (3) net 2 802d 845d 0/28 auto-obsoleted due to no activity on 2023/01/16 14:40
upstream general protection fault in find_match (4) net 1 486d 482d 0/28 auto-obsoleted due to no activity on 2023/11/20 22:29
upstream general protection fault in find_match (2) net 4 1394d 1460d 0/28 auto-closed as invalid on 2021/06/26 04:02
upstream general protection fault in find_match (5) net 2 194d 194d 26/28 fixed on 2024/07/10 10:07
▶ ▼ Fix bisection attempts (25)
Created Duration User Patch Repo Result
2021/10/20 11:32 12m bisect fix linux-4.19.y error job log
2021/09/20 10:45 46m bisect fix linux-4.19.y OK (0) job log log
2021/08/21 10:09 35m bisect fix linux-4.19.y OK (0) job log log
2021/07/22 09:26 43m bisect fix linux-4.19.y OK (0) job log log
2021/06/22 08:01 35m bisect fix linux-4.19.y OK (0) job log log
2021/05/22 14:13 50m bisect fix linux-4.19.y OK (0) job log log
2021/04/22 13:34 38m bisect fix linux-4.19.y OK (0) job log log
2021/03/23 12:55 38m bisect fix linux-4.19.y OK (0) job log log
2021/02/21 08:41 38m bisect fix linux-4.19.y OK (0) job log log
2021/02/18 04:45 19m bisect fix linux-4.19.y error job log
2021/02/05 21:17 1m bisect fix linux-4.19.y error job log
2021/01/06 20:30 39m bisect fix linux-4.19.y OK (0) job log log
2020/12/07 19:16 34m bisect fix linux-4.19.y OK (0) job log log
2020/11/07 18:42 34m bisect fix linux-4.19.y OK (0) job log log
2020/10/08 17:50 30m bisect fix linux-4.19.y OK (0) job log log
2020/09/08 17:13 36m bisect fix linux-4.19.y OK (0) job log log
2020/08/09 16:38 35m bisect fix linux-4.19.y OK (0) job log log
2020/07/10 16:06 31m bisect fix linux-4.19.y OK (0) job log log
2020/06/10 15:28 37m bisect fix linux-4.19.y OK (0) job log log
2020/05/11 14:45 42m bisect fix linux-4.19.y OK (0) job log log
2020/04/11 14:10 34m bisect fix linux-4.19.y OK (0) job log log
2020/03/12 13:33 32m bisect fix linux-4.19.y OK (0) job log log
2020/02/11 10:35 33m bisect fix linux-4.19.y OK (0) job log log
2020/01/12 09:56 31m bisect fix linux-4.19.y OK (0) job log log
2019/12/13 09:01 35m bisect fix linux-4.19.y OK (0) job log log

Sample crash report:
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: 8273 Comm: syz-executor030 Not tainted 4.19.80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fib6_ignore_linkdown net/ipv6/route.c:651 [inline]
RIP: 0010:find_match+0x153/0xe20 net/ipv6/route.c:667
Code: 0f b6 75 a8 40 84 f6 0f 84 76 06 00 00 e8 55 be 6e fb 49 8d bf 3c 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 dd
RSP: 0018:ffff888089356fb8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: ffffffff85fc0f72
RDX: 0000000000000047 RSI: ffffffff85fc08eb RDI: 000000000000023c
RBP: ffff888089357020 R08: ffff8880a1e48580 R09: ffffed1015d04733
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 0000000000000000
R13: ffff8880a4b73200 R14: ffff8880a4b73140 R15: 0000000000000000
FS:  00007f4da32fe700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000099fd3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 find_rr_leaf net/ipv6/route.c:713 [inline]
 rt6_select net/ipv6/route.c:763 [inline]
 fib6_table_lookup+0x48e/0xce0 net/ipv6/route.c:1870
 ip6_pol_route+0x1a4/0xfa0 net/ipv6/route.c:1903
 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2129
 fib6_rule_lookup+0x125/0x550 net/ipv6/fib6_rules.c:118
 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2157
 ip6_dst_lookup_tail+0x571/0x1a70 net/ipv6/ip6_output.c:979
 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1080
 ip6_sk_dst_lookup_flow net/ipv6/ip6_output.c:1118 [inline]
 ip6_sk_dst_lookup_flow+0x5c3/0xad0 net/ipv6/ip6_output.c:1108
 udpv6_sendmsg+0x17ad/0x28d0 net/ipv6/udp.c:1383
 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2115
 __sys_sendmmsg+0x1bf/0x4e0 net/socket.c:2210
 __do_sys_sendmmsg net/socket.c:2239 [inline]
 __se_sys_sendmmsg net/socket.c:2236 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x447979
Code: e8 8c e7 ff ff 48 83 c4 18 c3 0f 1f 80 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 0f 83 fb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4da32fdd98 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000447979
RDX: 00000000000000c6 RSI: 0000000020006d00 RDI: 0000000000000004
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 300300306d616574 R14: 0000000000000000 R15: 010000306d616574
Modules linked in:
---[ end trace 037660a5726b98ed ]---
RIP: 0010:fib6_ignore_linkdown net/ipv6/route.c:651 [inline]
RIP: 0010:find_match+0x153/0xe20 net/ipv6/route.c:667
Code: 0f b6 75 a8 40 84 f6 0f 84 76 06 00 00 e8 55 be 6e fb 49 8d bf 3c 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 dd
RSP: 0018:ffff888089356fb8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: ffffffff85fc0f72
RDX: 0000000000000047 RSI: ffffffff85fc08eb RDI: 000000000000023c
RBP: ffff888089357020 R08: ffff8880a1e48580 R09: ffffed1015d04733
R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 0000000000000000
R13: ffff8880a4b73200 R14: ffff8880a4b73140 R15: 0000000000000000
FS:  00007f4da32fe700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000099fd3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/10/23 11:45 linux-4.19.y c3038e718a19 d0686497 .config console log report syz C ci2-linux-4-19
* Struck through repros no longer work on HEAD.