WARNING in sta_info_insert_rcu

WARNING in sta_info_insert_rcu

[Hao Sun]

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 6880fa6c5660 Linux 5.15-rc1
git tree: upstream
console output:
https://drive.google.com/file/d/1JAoHNesGqAqeOvuCFuKXI-F9pBTcwDNo/view?usp=sharing
kernel config: https://drive.google.com/file/d/1rUzyMbe5vcs6khA3tL9EHTLJvsUdWcgB/view?usp=sharing

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@gmail.com>

------------[ cut here ]------------
WARNING: CPU: 3 PID: 7312 at net/mac80211/sta_info.c:546
sta_info_insert_check net/mac80211/sta_info.c:545 [inline]
WARNING: CPU: 3 PID: 7312 at net/mac80211/sta_info.c:546
sta_info_insert_rcu+0xa3/0x1130 net/mac80211/sta_info.c:723
Modules linked in:
CPU: 3 PID: 7312 Comm: kworker/u8:4 Not tainted 5.15.0-rc1 #16
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: phy4 ieee80211_iface_work
RIP: 0010:sta_info_insert_check net/mac80211/sta_info.c:545 [inline]
RIP: 0010:sta_info_insert_rcu+0xa3/0x1130 net/mac80211/sta_info.c:723
Code: 16 00 00 8b 90 a8 16 00 00 44 31 f9 44 31 e2 0f b7 c1 09 c2 74
0f e8 dc c0 43 fd 41 f6 c4 01 0f 84 b2 00 00 00 e8 cd c0 43 fd <0f> 0b
41 bc ea ff ff ff e8 c0 c0 43 fd 48 89 de 4c 89 f7 e8 35 fe
RSP: 0018:ffffc90005b8bc98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88810ce08000 RCX: 0000000000000000
RDX: ffff88810cdda240 RSI: ffffffff83f3d133 RDI: 0000000000000000
RBP: ffffc90005b8bd18 R08: ffffffff83f3d0d6 R09: 0000000000000000
R10: ffffc90005b8bc98 R11: 0000000000000003 R12: 00000000000ecf85
R13: ffff88810ce49708 R14: ffff88810ce48d60 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001b52c48 CR3: 000000010c909000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 ieee80211_ibss_finish_sta+0xbc/0x170 net/mac80211/ibss.c:585
 ieee80211_ibss_work+0x13f/0x7d0 net/mac80211/ibss.c:1693
 ieee80211_iface_work+0x43a/0x5f0 net/mac80211/iface.c:1515
 process_one_work+0x359/0x850 kernel/workqueue.c:2297
 worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
 kthread+0x178/0x1b0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

WARNING in sta_info_insert_rcu

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    eff48dde Merge tag 'trace-v5.9-rc5' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17b4e8e3900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5f4c828c9e3cef97
dashboard link: https://syzkaller.appspot.com/bug?extid=ef4ca92d9d6f5ba2f880
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167e5707900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1765b19b900000

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10341dab900000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12341dab900000
console output: https://syzkaller.appspot.com/x/log.txt?x=14341dab900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ef4ca92d9d6f5ba2f880@syzkaller.appspotmail.com

wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
------------[ cut here ]------------
WARNING: CPU: 0 PID: 72 at net/mac80211/sta_info.c:529 sta_info_insert_check net/mac80211/sta_info.c:529 [inline]
WARNING: CPU: 0 PID: 72 at net/mac80211/sta_info.c:529 sta_info_insert_rcu+0x27a/0x2ba0 net/mac80211/sta_info.c:707
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 72 Comm: kworker/u4:3 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy4 ieee80211_iface_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:sta_info_insert_check net/mac80211/sta_info.c:529 [inline]
RIP: 0010:sta_info_insert_rcu+0x27a/0x2ba0 net/mac80211/sta_info.c:707
Code: 24 e8 3a 79 b8 f9 0f b6 85 50 ff ff ff 31 ff 83 e0 01 41 89 c7 89 c6 e8 44 75 b8 f9 45 84 ff 0f 84 c5 00 00 00 e8 16 79 b8 f9 <0f> 0b 41 bd ea ff ff ff e8 09 79 b8 f9 48 8b bd 30 ff ff ff e8 ed
RSP: 0018:ffffc90001017958 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888093338c00 RCX: ffffffff87bdc51c
RDX: ffff8880a9394040 RSI: ffffffff87bdc52a RDI: 0000000000000001
RBP: ffffc90001017aa0 R08: 0000000000000000 R09: ffff88809333925f
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000500177e9
R13: ffff8880a8916048 R14: ffff8880a8916000 R15: 0000000000000001
 ieee80211_ibss_finish_sta+0x212/0x390 net/mac80211/ibss.c:592
 ieee80211_ibss_work+0x2c7/0xe80 net/mac80211/ibss.c:1699
 ieee80211_iface_work+0x7d2/0x8f0 net/mac80211/iface.c:1438
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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syzbot will keep track of this issue. See:
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches