bisecting fixing commit since 5b7a52cd2eef952cee8a72512ef370bcdef46636
building syzkaller on 96e03c1c31a7f2e7f80b2d8b9f3df117df5030d1
testing commit 5b7a52cd2eef952cee8a72512ef370bcdef46636 with gcc (GCC) 8.1.0
kernel signature: cb19599b7dddbac2b1e65952ac7d2534ccc873faa548cf1a0456aecbcc18f0af
all runs: crashed: WARNING in sta_info_alloc
testing current HEAD 2d2791fce891fc20709232d49a6bae075b9a77f8
testing commit 2d2791fce891fc20709232d49a6bae075b9a77f8 with gcc (GCC) 8.1.0
kernel signature: 6e38366acec35b82904c2d61a693260e1a79a5f970e0e84324f5ee261d0331ac
all runs: crashed: WARNING in sta_info_alloc
revisions tested: 2, total time: 22m7.374911713s (build: 15m59.154250204s, test: 5m37.613488985s)
the crash still happens on HEAD
commit msg: Linux 4.14.217
crash: WARNING in sta_info_alloc
IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth1_vlan: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9074 at net/mac80211/ieee80211_i.h:1408 rcu_read_lock include/linux/rcupdate.h:630 [inline]
WARNING: CPU: 1 PID: 9074 at net/mac80211/ieee80211_i.h:1408 ieee80211_get_sband net/mac80211/ieee80211_i.h:1405 [inline]
WARNING: CPU: 1 PID: 9074 at net/mac80211/ieee80211_i.h:1408 sta_info_alloc+0x11aa/0x1590 net/mac80211/sta_info.c:421
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 9074 Comm: syz-executor.0 Not tainted 4.14.217-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+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [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_get_sband net/mac80211/ieee80211_i.h:1408 [inline]
RIP: 0010:sta_info_alloc+0x11aa/0x1590 net/mac80211/sta_info.c:421
RSP: 0018:ffff8881d233f490 EFLAGS: 00010246
RAX: 0000000000000001 RBX: ffff8881d0ce6e40 RCX: ffffed103d1de560
RDX: 1ffffffff11e1099 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8881d233f4e8 R08: 1ffff1103d1de560 R09: 0000000000000000
R10: 0000000000000078 R11: ffff8881e8ef2280 R12: 0000000000000000
R13: ffff8881d84e1820 R14: dffffc0000000000 R15: ffff8881d0ce73c8
 ieee80211_add_station+0x1fe/0x500 net/mac80211/cfg.c:1423
 rdev_add_station net/wireless/rdev-ops.h:176 [inline]
 nl80211_new_station+0x828/0x1560 net/wireless/nl80211.c:5262
 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+0x657/0xc60 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: 0033:0x45de49
RSP: 002b:00007ff9f1c5bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002bb00 RCX: 000000000045de49
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000006
RBP: 000000000118c158 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c124
R13: 00007ffcc5c72a8f R14: 00007ff9f1c5c9c0 R15: 000000000118c124
Kernel Offset: disabled
Rebooting in 86400 seconds..