Subject: Re: [syzbot] WARNING in ieee80211_rx_list

From: syzbot <[email-masked]>
Date: Fri, 04 Feb 2022 18:33:18 -0800

syzbot has found a reproducer for the following issue on:

HEAD commit:    227a0713b319 libbpf: Deprecate forgotten btf__get_map_kv_t..
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15d58c62700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b210f94c3ec14b22
dashboard link: https://syzkaller.appspot.com/bug?extid=8830db5d3593b5546d2e
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1692ceec700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16e97524700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

------------[ cut here ]------------
WARNING: CPU: 0 PID: 13 at net/mac80211/rx.c:4902 ieee80211_rx_list+0x18e2/0x2740 net/mac80211/rx.c:4902
Modules linked in:
CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.16.0-syzkaller-11609-g227a0713b319 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ieee80211_rx_list+0x18e2/0x2740 net/mac80211/rx.c:4902
Code: 00 00 31 ff 89 de e8 ad ba d8 f8 85 db 0f 85 19 02 00 00 e8 80 b8 d8 f8 4c 89 e7 e8 48 ef 88 fe e9 bc eb ff ff e8 6e b8 d8 f8 <0f> 0b e9 53 ec ff ff e8 62 b8 d8 f8 4c 89 ea 48 b8 00 00 00 00 00
RSP: 0018:ffffc90000d27b80 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888074dab3c8 RCX: 0000000000000100
RDX: ffff8880118d0000 RSI: ffffffff889f9d32 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff889f86cb R11: 0000000000000000 R12: ffff888078f17280
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888074da8e60
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555566663b8 CR3: 000000000b88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ieee80211_rx_napi+0xdb/0x3d0 net/mac80211/rx.c:5000
 ieee80211_rx include/net/mac80211.h:4594 [inline]
 ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:784
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:921 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>