Re: kernel panic: audit: backlog limit exceeded

Hello, syzbot found the following crash on: HEAD commit: 36a44bcd Merge branch 'bnxt_en-shutdown-and-kexec-kdump-re.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=148bfdd9e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=768cc3d3e277cc16 dashboard link: https://syzkaller.appspot.com/bug?extid=9a5e789e4725b9ef1316 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151b1109e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=128bfdd9e00000 The bug was bisected to: commit 0c1b9970ddd4cc41002321c3877e7f91aacb896d Author: Dan Carpenter <dan.carpenter(a)oracle.com&gt; Date: Fri Jul 28 14:42:27 2017 +0000 staging: lustre: lustre: Off by two in lmv_fid2path() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17e6c3e9e00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=1416c3e9e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1016c3e9e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9a5e789e4725b9ef1316(a)syzkaller.appspotmail.com Fixes: 0c1b9970ddd4 ("staging: lustre: lustre: Off by two in lmv_fid2path()") audit: audit_backlog=13 > audit_backlog_limit=7 audit: audit_lost=1 audit_rate_limit=0 audit_backlog_limit=7 Kernel panic - not syncing: audit: backlog limit exceeded CPU: 1 PID: 9913 Comm: syz-executor024 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 audit_panic.cold+0x32/0x32 kernel/audit.c:307 audit_log_lost kernel/audit.c:377 [inline] audit_log_lost+0x8b/0x180 kernel/audit.c:349 audit_log_start kernel/audit.c:1788 [inline] audit_log_start+0x70e/0x7c0 kernel/audit.c:1745 audit_log+0x95/0x120 kernel/audit.c:2345 xt_replace_table+0x61d/0x830 net/netfilter/x_tables.c:1413 __do_replace+0x1da/0x950 net/ipv6/netfilter/ip6_tables.c:1084 do_replace net/ipv6/netfilter/ip6_tables.c:1157 [inline] do_ip6t_set_ctl+0x33a/0x4c8 net/ipv6/netfilter/ip6_tables.c:1681 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt net/ipv6/ipv6_sockglue.c:949 [inline] ipv6_setsockopt+0x147/0x180 net/ipv6/ipv6_sockglue.c:933 tcp_setsockopt net/ipv4/tcp.c:3165 [inline] tcp_setsockopt+0x8f/0xe0 net/ipv4/tcp.c:3159 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3149 __sys_setsockopt+0x261/0x4c0 net/socket.c:2130 __do_sys_setsockopt net/socket.c:2146 [inline] __se_sys_setsockopt net/socket.c:2143 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2143 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44720a Code: 49 89 ca b8 37 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 1a e0 fb ff c3 66 0f 1f 84 00 00 00 00 00 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 fa df fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007ffd032dec78 EFLAGS: 00000286 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044720a RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00007ffd032deda0 R08: 00000000000003b8 R09: 0000000000004000 R10: 00000000006d7b40 R11: 0000000000000286 R12: 00007ffd032deca0 R13: 00000000006d9d60 R14: 0000000000000029 R15: 00000000006d7ba0 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches