bisecting fixing commit since 4fccc2503536a564a4ba31a1d50439854201659f building syzkaller on 2c36e7a75f8689b3da20e1a81a2ee5391f3af6e5 testing commit 4fccc2503536a564a4ba31a1d50439854201659f compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: e3ea201bcfb75b0fc3c4db929bfcf87dca7b53967facd1f1ef222c0626f975ef all runs: crashed: kernel panic: audit: rate limit exceeded testing current HEAD 59456c9cc40c8f75b5a7efa0fe1f211d9c6fcaf1 testing commit 59456c9cc40c8f75b5a7efa0fe1f211d9c6fcaf1 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: b8cfd88d93e4d9b6e4bd18a589b9e22d0c00da1200c499f0605f830ab1047c33 all runs: crashed: kernel panic: audit: rate limit exceeded revisions tested: 2, total time: 29m3.781271145s (build: 22m7.646131534s, test: 6m30.810265491s) the crash still happens on HEAD commit msg: Linux 4.19.204 crash: kernel panic: audit: rate limit exceeded batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! audit: audit_lost=1 audit_rate_limit=2 audit_backlog_limit=0 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 Kernel panic - not syncing: audit: rate limit exceeded batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! CPU: 0 PID: 5892 Comm: syz-executor.2 Not tainted 4.19.204-syzkaller #0 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: batman_adv: batadv0: Interface activated: batadv_slave_1 __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: type=1305 audit(1629695237.900:5): audit_backlog_limit=0 old=64 auid=4294967295 ses=4294967295 subj==unconfined res=1 audit_log+0xae/0xf0 kernel/audit.c:2396 audit: type=1325 audit(1629695237.940:6): table=filter family=10 entries=4 xt_replace_table+0x55b/0x750 net/netfilter/x_tables.c:1414 __do_replace+0x1a9/0x9b0 net/ipv6/netfilter/ip6_tables.c:1087 audit: type=1325 audit(1629695237.940:7): table=mangle family=10 entries=6 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline] do_ip6t_set_ctl+0x27e/0x3f0 net/ipv6/netfilter/ip6_tables.c:1686 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5c/0xb0 net/netfilter/nf_sockopt.c:115 audit: audit_lost=2 audit_rate_limit=2 audit_backlog_limit=0 ipv6_setsockopt+0x95/0xf0 net/ipv6/ipv6_sockglue.c:945 tcp_setsockopt net/ipv4/tcp.c:3108 [inline] tcp_setsockopt+0x6a/0xd0 net/ipv4/tcp.c:3102 sock_common_setsockopt+0x73/0xf0 net/core/sock.c:3072 __sys_setsockopt+0x13e/0x210 net/socket.c:2011 __do_sys_setsockopt net/socket.c:2022 [inline] __se_sys_setsockopt net/socket.c:2019 [inline] __x64_sys_setsockopt+0xb9/0x150 net/socket.c:2019 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4653ca Code: 73 01 c3 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 66 90 49 89 ca b8 36 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:00007ffc3c0aa138 EFLAGS: 00000202 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00000000004653ca RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00007ffc3c0aa160 R08: 00000000000002e8 R09: 0079746972756365 R10: 000000000050b1c0 R11: 0000000000000202 R12: 0000000000000003 R13: 00007ffc3c0aa15c R14: 0000000000000000 R15: 000000000050b160 Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds..