bisecting fixing commit since 4fccc2503536a564a4ba31a1d50439854201659f building syzkaller on 2c36e7a75f8689b3da20e1a81a2ee5391f3af6e5 testing commit 4fccc2503536a564a4ba31a1d50439854201659f with gcc (GCC) 8.4.1 20210217 kernel signature: 4e07f44469b62f7bd193c8b9cb1d28ece92e63f53c57a94c85ba60ec0a79d2f1 all runs: crashed: kernel panic: audit: rate limit exceeded testing current HEAD eb575cd5d7f60241d016fdd13a9e86d962093c9b testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b with gcc (GCC) 8.4.1 20210217 kernel signature: 26c4fd4615c2e6ce7f1cfa724a72ac42f8a84102ddefcd731e5d985c163b6e64 all runs: crashed: kernel panic: audit: rate limit exceeded revisions tested: 2, total time: 23m56.429479065s (build: 17m27.745563847s, test: 6m8.229816905s) the crash still happens on HEAD commit msg: Linux 4.19.195 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:3d) already exists on: batadv_slave_0 audit: type=1305 audit(1624484980.395:3): 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 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 CPU: 0 PID: 7159 Comm: syz-executor.0 Not tainted 4.19.195-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 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! audit_log_lost kernel/audit.c:390 [inline] audit_log_lost+0x57/0x120 kernel/audit.c:362 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 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 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! 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:1320 [inline] netlink_unicast+0x443/0x650 net/netlink/af_netlink.c:1346 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready netlink_sendmsg+0x764/0xc60 net/netlink/af_netlink.c:1911 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 batman_adv: batadv0: Interface activated: batadv_slave_0 __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 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:00007fe69279f198 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 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 R13: 00007fe69279f6bc R14: 00000000ffffffff R15: 0000000000000003 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! Kernel Offset: disabled Rebooting in 86400 seconds..