bisecting fixing commit since 748d1c8a425ec529d541f082ee7a81f6a51fa120
building syzkaller on 3e8f6c27551f163a2fd2661e4b3cac126a5e7ef2
testing commit 748d1c8a425ec529d541f082ee7a81f6a51fa120 with gcc (GCC) 8.1.0
kernel signature: edc0b6b15f60187b1668124b5576488393bfa51d300f558a1058be5d02ee914e
all runs: crashed: WARNING in sta_info_insert_rcu
testing current HEAD f9e425e99b0756c1479042afe761073779df2a30
testing commit f9e425e99b0756c1479042afe761073779df2a30 with gcc (GCC) 8.1.0
kernel signature: 7e17cb15804673da6cd7294cd24fa16287d29b2ddc78907bcb58350a8be740d6
all runs: crashed: WARNING in sta_info_insert_rcu
revisions tested: 2, total time: 16m2.134901494s (build: 9m56.875392463s, test: 5m22.454638492s)
the crash still happens on HEAD
commit msg: octeontx2-af: Add support for RSS hashing based on Transport protocol field
crash: WARNING in sta_info_insert_rcu
------------[ cut here ]------------
WARNING: CPU: 0 PID: 708 at net/mac80211/sta_info.c:548 sta_info_insert_check net/mac80211/sta_info.c:547 [inline]
WARNING: CPU: 0 PID: 708 at net/mac80211/sta_info.c:548 sta_info_insert_rcu+0x7d/0xdf0 net/mac80211/sta_info.c:725
Modules linked in:
CPU: 1 PID: 708 Comm: kworker/u4:4 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy4 ieee80211_iface_work

RIP: 0010:sta_info_insert_check net/mac80211/sta_info.c:547 [inline]
RIP: 0010:sta_info_insert_rcu+0x7d/0xdf0 net/mac80211/sta_info.c:725
Code: 8b 93 84 0c 00 00 0f b7 83 88 0c 00 00 41 8b 8d c0 14 00 00 66 41 33 85 c4 14 00 00 31 d1 0f b7 c0 09 c8 74 05 83 e2 01 74 69 <0f> 0b 41 bd ea ff ff ff 48 89 de 4c 89 e7 e8 a0 fe ff ff 4c 89 ff
RSP: 0018:ffffc90001b3fd00 EFLAGS: 00010202
RAX: 00000000b4d07db5 RBX: ffff88811f1a2000 RCX: 00000000b4d05d35
RDX: 0000000000000001 RSI: ffffffff840a8bff RDI: 0000000000000000
RBP: ffffc90001b3fd78 R08: ffffffff82ffa5e0 R09: 0000000000000000
R10: ffffc90001b3fd00 R11: 0000000000000001 R12: ffff88811f148c80
R13: ffff88811f1d4c00 R14: dead000000000100 R15: ffff88811f1494e0
FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd0a56e4db8 CR3: 0000000110cf5000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ieee80211_ibss_finish_sta+0x9e/0x120 net/mac80211/ibss.c:592
 ieee80211_ibss_work+0x10a/0x420 net/mac80211/ibss.c:1700
 process_one_work+0x273/0x600 kernel/workqueue.c:2272
 worker_thread+0x38/0x380 kernel/workqueue.c:2418
 kthread+0x145/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296