bisecting fixing commit since 4fccc2503536a564a4ba31a1d50439854201659f building syzkaller on 2c36e7a75f8689b3da20e1a81a2ee5391f3af6e5 testing commit 4fccc2503536a564a4ba31a1d50439854201659f with gcc (GCC) 8.4.1 20210217 kernel signature: 988294a7f8b646010f945461b16e007a1db476ae6d88ec84ea2a0f9118d27c1d all runs: crashed: kernel panic: audit: rate limit exceeded testing current HEAD 255b58a2b3af0baa0ee11507390349217b8b73b0 testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217 kernel signature: 7523b9bbe499f10e94ec88355f9be4393271bb39e5b4378858d761f91a021f12 all runs: crashed: kernel panic: audit: rate limit exceeded revisions tested: 2, total time: 22m44.874248932s (build: 15m43.462722593s, test: 6m9.830942167s) the crash still happens on HEAD commit msg: Linux 4.19.176 crash: kernel panic: audit: rate limit exceeded audit: audit_lost=1 audit_rate_limit=2 audit_backlog_limit=0 audit: type=1325 audit(1614072721.846:6): table=nat family=2 entries=5 audit: audit_lost=2 audit_rate_limit=2 audit_backlog_limit=0 audit: type=1325 audit(1614072721.886:7): table=raw family=2 entries=0 Kernel panic - not syncing: audit: rate limit exceeded CPU: 1 PID: 5888 Comm: syz-executor.4 Not tainted 4.19.176-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+0x123/0x171 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 audit_panic.cold.22+0x28/0x28 kernel/audit.c:320 audit_log_lost kernel/audit.c:390 [inline] audit_log_lost+0x57/0x120 kernel/audit.c:362 audit_log_end+0x1cf/0x240 kernel/audit.c:2368 audit_log+0xae/0xf0 kernel/audit.c:2396 xt_replace_table+0x455/0x570 net/netfilter/x_tables.c:1398 xt_register_table+0x253/0x530 net/netfilter/x_tables.c:1437 ipt_register_table+0x182/0x2d0 net/ipv4/netfilter/ip_tables.c:1779 iptable_mangle_table_init.part.1+0x3f/0x60 net/ipv4/netfilter/iptable_mangle.c:100 iptable_mangle_table_init+0x3d/0x50 net/ipv4/netfilter/iptable_mangle.c:104 xt_find_table_lock+0x206/0x370 net/netfilter/x_tables.c:1228 xt_request_find_table_lock+0x1c/0xa0 net/netfilter/x_tables.c:1258 get_info+0x101/0x460 net/ipv6/netfilter/ip6_tables.c:984 do_ipt_get_ctl+0x12e/0x700 net/ipv4/netfilter/ip_tables.c:1699 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x5f/0xc0 net/netfilter/nf_sockopt.c:122 ip_getsockopt net/ipv4/ip_sockglue.c:1574 [inline] ip_getsockopt+0xf9/0x130 net/ipv4/ip_sockglue.c:1554 tcp_getsockopt net/ipv4/tcp.c:3618 [inline] tcp_getsockopt+0x6a/0xd0 net/ipv4/tcp.c:3612 sock_common_getsockopt+0x73/0xf0 net/core/sock.c:3031 __sys_getsockopt+0x12e/0x1f0 net/socket.c:1938 __do_sys_getsockopt net/socket.c:1949 [inline] __se_sys_getsockopt net/socket.c:1946 [inline] __x64_sys_getsockopt+0xb9/0x150 net/socket.c:1946 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46539a Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 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:00007ffce17c8028 EFLAGS: 00000202 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000046539a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007ffce17c805c R09: 0000000000000310 R10: 000000000050cc68 R11: 0000000000000202 R12: 00007ffce17c805c R13: 00000000004bb074 R14: 000000000050cc68 R15: 000000000050cc60 Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds..