bisecting fixing commit since 4fccc2503536a564a4ba31a1d50439854201659f building syzkaller on 2c36e7a75f8689b3da20e1a81a2ee5391f3af6e5 testing commit 4fccc2503536a564a4ba31a1d50439854201659f with gcc (GCC) 8.4.1 20210217 kernel signature: 5447e786ad4e17ee0e783ce3ff853a9789308fd315939aa595a318674dffe91d all runs: crashed: kernel panic: audit: rate limit exceeded testing current HEAD 2965db2e004cf9c92b87c1f559e9812c0ae878c1 testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217 kernel signature: 833b058ba0d2ce1264a3a7c285abcfc00ce039315e6463c78d9f5bb17effaf7b all runs: crashed: kernel panic: audit: rate limit exceeded revisions tested: 2, total time: 28m21.76878399s (build: 21m22.394736368s, test: 6m31.235623719s) the crash still happens on HEAD commit msg: Linux 4.19.188 crash: kernel panic: audit: rate limit exceeded batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 audit: type=1305 audit(1619296689.214:2): audit_failure=2 old=1 auid=4294967295 ses=4294967295 subj==unconfined res=1 audit: audit_lost=1 audit_rate_limit=2 audit_backlog_limit=0 audit: type=1305 audit(1619296689.214:3): audit_pid=0 old=0 auid=4294967295 ses=4294967295 subj==unconfined res=1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! Kernel panic - not syncing: audit: rate limit exceeded CPU: 0 PID: 7147 Comm: syz-executor.1 Not tainted 4.19.188-syzkaller #0 audit: type=1305 audit(1619296689.214:4): audit_rate_limit=2 old=0 auid=4294967295 ses=4294967295 subj==unconfined res=1 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_config_change+0x82/0xb0 kernel/audit.c:409 audit_receive_msg+0x1816/0x1da0 kernel/audit.c:1290 audit: type=1305 audit(1619296689.214:5): audit_backlog_limit=0 old=64 auid=4294967295 ses=4294967295 subj==unconfined res=1 audit: type=1305 audit(1619296689.224:6): audit_enabled=1 old=1 auid=4294967295 ses=4294967295 subj==unconfined res=1 audit: type=1305 audit(1619296689.224:7): audit_failure=2 old=2 auid=4294967295 ses=4294967295 subj==unconfined res=1 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! audit_receive+0xea/0x210 kernel/audit.c:1525 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x650 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x764/0xc60 net/netlink/af_netlink.c:1909 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x463d89 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007eff4c0cf198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000000008e1 RCX: 0000000000463d89 RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000003 RBP: 000000000000002e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000053bf00 R13: 00007eff4c0cf6bc R14: 00000000ffffffff R15: 0000000000000003 Kernel Offset: disabled Rebooting in 86400 seconds..