bisecting fixing commit since 6b6446efedb27c2766745a04f9b5d4449f51391d
building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f
testing commit 6b6446efedb27c2766745a04f9b5d4449f51391d with gcc (GCC) 8.4.1 20210217
kernel signature: bca5df721d1e0303c92d8ad79b12bd53b7fa1a4e539e692f45eed6d6b48700f3
all runs: crashed: WARNING in ieee80211_probe_client
testing current HEAD 29c52025152bab4c557d8174da58f1a4c8e70438
testing commit 29c52025152bab4c557d8174da58f1a4c8e70438 with gcc (GCC) 8.4.1 20210217
kernel signature: b5e823c5d24ceadf37e00d8d282e807a5fd78b4f5463d2ed6049a5cbf572bc83
all runs: crashed: WARNING in ieee80211_probe_client
revisions tested: 2, total time: 21m39.326764742s (build: 14m28.211947079s, test: 6m17.717250342s)
the crash still happens on HEAD
commit msg: Linux 4.14.221
crash: WARNING in ieee80211_probe_client
IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready
------------[ cut here ]------------
WARNING: CPU: 0 PID: 9107 at net/mac80211/cfg.c:3392 rcu_read_unlock include/linux/rcupdate.h:681 [inline]
WARNING: CPU: 0 PID: 9107 at net/mac80211/cfg.c:3392 ieee80211_probe_client+0x5cf/0x700 net/mac80211/cfg.c:3457
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 9107 Comm: syz-executor.2 Not tainted 4.14.221-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1e7 lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.7+0x25/0x25 kernel/panic.c:547
 report_bug+0x1a1/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:ieee80211_probe_client+0x5cf/0x700 net/mac80211/cfg.c:3392
RSP: 0018:ffff8881d4a0f4e0 EFLAGS: 00010246
RAX: 0000000000000001 RBX: ffff8881cc851000 RCX: ffffed103cfda928
RDX: 1ffffffff11e1099 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8881d4a0f538 R08: 1ffff1103cfda928 R09: 0000000000000000
R10: 00000000000000a0 R11: ffff8881e7ed40c0 R12: ffff8881ef9098a0
R13: ffff8881e824bca0 R14: 0000000000000000 R15: ffff8881f1b76680
 rdev_probe_client net/wireless/rdev-ops.h:882 [inline]
 nl80211_probe_client+0x339/0xad0 net/wireless/nl80211.c:11067
 genl_family_rcv_msg+0x57f/0xfe0 net/netlink/genetlink.c:600
 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:625
 netlink_rcv_skb+0x12f/0x3b0 net/netlink/af_netlink.c:2433
 genl_rcv+0x23/0x40 net/netlink/genetlink.c:636
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x40b/0x610 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x639/0xbe0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xac/0xf0 net/socket.c:656
 ___sys_sendmsg+0x625/0x920 net/socket.c:2062
 __sys_sendmsg+0xc1/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0xd/0x20 net/socket.c:2103
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465889
RSP: 002b:00007f637939e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000055c0f8 RCX: 0000000000465889
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055c0f8
R13: 00007ffe8e7463ef R14: 00007f637939e300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..