bisecting fixing commit since 996e435fd401de35df62ac943ab9402cfe85c430
building syzkaller on 2c1f2513486f21d26b1942ce77ffc782677fbf4e
testing commit 996e435fd401de35df62ac943ab9402cfe85c430 with gcc (GCC) 10.2.1 20210217
kernel signature: f32cb4825361fffe2bfc56a60ae1b225a2c09caa382843176d1fe2bbded41f9a
all runs: crashed: WARNING in sta_info_insert_rcu
testing current HEAD fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
testing commit fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8 with gcc (GCC) 10.2.1 20210217
kernel signature: dc95dc5f77eefce6997fe9c769444e0b83b58ff349460ae1df4429c540d71463
all runs: crashed: WARNING in sta_info_insert_rcu
revisions tested: 2, total time: 18m58.255077111s (build: 11m47.416877986s, test: 6m30.474809203s)
the crash still happens on HEAD
commit msg: Linux 5.12-rc1
crash: WARNING in sta_info_insert_rcu
wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
------------[ cut here ]------------
WARNING: CPU: 0 PID: 242 at net/mac80211/sta_info.c:547 sta_info_insert_check net/mac80211/sta_info.c:547 [inline]
WARNING: CPU: 0 PID: 242 at net/mac80211/sta_info.c:547 sta_info_insert_rcu+0x250/0x2540 net/mac80211/sta_info.c:725
Modules linked in:
CPU: 0 PID: 242 Comm: kworker/u4:5 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy5 ieee80211_iface_work
RIP: 0010:sta_info_insert_check net/mac80211/sta_info.c:547 [inline]
RIP: 0010:sta_info_insert_rcu+0x250/0x2540 net/mac80211/sta_info.c:725
Code: 07 83 c0 01 38 c8 7c 08 84 c9 0f 85 06 12 00 00 66 41 33 9c 24 c4 14 00 00 0f b7 db 09 d3 74 0a 41 83 e7 01 0f 84 8d 00 00 00 <0f> 0b 41 bf ea ff ff ff 48 8b b5 50 ff ff ff 4c 89 f7 e8 69 fa ff
RSP: 0018:ffffc9000190f9e0 EFLAGS: 00010202
RAX: 0000000000000005 RBX: 00000000bd723777 RCX: 0000000000000000
RDX: 00000000bd722565 RSI: ffff8880241c8c84 RDI: ffff8880293120c4
RBP: ffffc9000190fb28 R08: 0000000000000000 R09: ffff88802931125f
R10: ffffed100526224b R11: 0000000000000001 R12: ffff888029310c00
R13: ffff88802e8595a8 R14: ffff88802e858d00 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff29b0c0000 CR3: 000000001a4bf000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ieee80211_ibss_finish_sta+0x1a1/0x2c0 net/mac80211/ibss.c:592
 ieee80211_ibss_work+0x265/0xcd0 net/mac80211/ibss.c:1700
 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275
 worker_thread+0x598/0xf80 kernel/workqueue.c:2421
 kthread+0x36f/0x450 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294