On Tue, Oct 06, 2020 at 01:08:23AM -0700, syzbot wrote:

Hello,

syzbot found the following issue on:

HEAD commit:    549738f1 Linux 5.9-rc8
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15b97ba3900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c06bcf3cc963d91c
dashboard link: https://syzkaller.appspot.com/bug?extid=45d7c243c006f39dc55a
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12bae9c0500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1099b1c0500000

The issue was bisected to:

commit 643c332d519bdfbf80d21f40d1c0aa0ccf3ec1cb
Author: Zi Shen Lim [off-list ref]
Date:   Thu Jun 9 04:18:50 2016 +0000

    arm64: bpf: optimize LD_ABS, LD_IND

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11d44477900000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13d44477900000
console output: https://syzkaller.appspot.com/x/log.txt?x=15d44477900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+45d7c243c006f39dc55a@syzkaller.appspotmail.com
Fixes: 643c332d519b ("arm64: bpf: optimize LD_ABS, LD_IND")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6879 at net/mac80211/ieee80211_i.h:1447 ieee80211_get_sband net/mac80211/ieee80211_i.h:1447 [inline]
WARNING: CPU: 0 PID: 6879 at net/mac80211/ieee80211_i.h:1447 sta_info_alloc+0x1900/0x1f90 net/mac80211/sta_info.c:469
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6879 Comm: syz-executor071 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:ieee80211_get_sband net/mac80211/ieee80211_i.h:1447 [inline]

The patch fingered by the bisection only affects arm64, but this is an x86
box. So this is clearly bogus.

Will