bisecting fixing commit since 4fccc2503536a564a4ba31a1d50439854201659f
building syzkaller on 2c36e7a75f8689b3da20e1a81a2ee5391f3af6e5
testing commit 4fccc2503536a564a4ba31a1d50439854201659f with gcc (GCC) 8.1.0
kernel signature: f287dfb69f778938bdc90153879440e89f3562712325005384d8035a3918588c
all runs: crashed: kernel panic: audit: rate limit exceeded
testing current HEAD b3a99fd385fab59d0b8b4fdfb449c1e979accab8
testing commit b3a99fd385fab59d0b8b4fdfb449c1e979accab8 with gcc (GCC) 8.1.0
kernel signature: 66346ddfbd7c30e547c5c5fb4a3febe3f1df80fc4cae80c95543bbd4dac92724
all runs: crashed: kernel panic: audit: rate limit exceeded
revisions tested: 2, total time: 23m35.593954412s (build: 17m0.973850666s, test: 6m11.309433365s)
the crash still happens on HEAD
commit msg: Linux 4.19.129
crash: kernel panic: audit: rate limit exceeded
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
audit: audit_lost=1 audit_rate_limit=2 audit_backlog_limit=0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Kernel panic - not syncing: audit: rate limit exceeded

IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
CPU: 0 PID: 7830 Comm: syz-executor.2 Not tainted 4.19.129-syzkaller #0
batman_adv: batadv0: Interface activated: batadv_slave_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+0x123/0x177 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+0x57/0x120 kernel/audit.c:390
 audit_log_end+0x1cf/0x240 kernel/audit.c:2368
 audit_log_config_change+0x82/0xb0 kernel/audit.c:409
 audit_receive_msg+0x180e/0x1d90 kernel/audit.c:1290
 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+0x765/0xc40 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:632
 ___sys_sendmsg+0x647/0x950 net/socket.c:2115
audit: audit_lost=2 audit_rate_limit=2 audit_backlog_limit=0
 __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
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c429
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f66ed8b7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f66ed8b86d4 RCX: 000000000045c429
RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000003
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008e1 R14: 00000000004cb435 R15: 000000000076bf2c
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..