netdev - [syzbot] WARNING in ieee80211_vif_release

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Date:   Sun, 19 Dec 2021 23:51:24 -0800
From:   syzbot <syzbot+11c342e5e30e9539cabd@...kaller.appspotmail.com>
To:     bp@...en8.de, davem@...emloft.net, dwmw@...zon.co.uk,
        hpa@...or.com, jmattson@...gle.com, johannes@...solutions.net,
        joro@...tes.org, kuba@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        mingo@...hat.com, netdev@...r.kernel.org, pbonzini@...hat.com,
        seanjc@...gle.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org
Subject: [syzbot] WARNING in ieee80211_vif_release_channel (2)

Hello,

syzbot found the following issue on:

HEAD commit:    60ec7fcfe768 qlcnic: potential dereference null pointer of..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=1390880db00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fa556098924b78f0
dashboard link: https://syzkaller.appspot.com/bug?extid=11c342e5e30e9539cabd
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=10e0a349b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ef4733b00000

The issue was bisected to:

commit 0985dba842eaa391858972cfe2724c3c174a2827
Author: David Woodhouse <dwmw@...zon.co.uk>
Date:   Sat Oct 23 19:47:19 2021 +0000

    KVM: x86/xen: Fix kvm_xen_has_interrupt() sleeping in kvm_vcpu_block()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12f0cdd5b00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11f0cdd5b00000
console output: https://syzkaller.appspot.com/x/log.txt?x=16f0cdd5b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+11c342e5e30e9539cabd@...kaller.appspotmail.com
Fixes: 0985dba842ea ("KVM: x86/xen: Fix kvm_xen_has_interrupt() sleeping in kvm_vcpu_block()")

RSP: 002b:00007fff775e50d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f668292e069
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000002 R09: 00007fff775e5110
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff775e5100
R13: 000000000000000e R14: 00000000ffffffff R15: 0000000000000000
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3601 at net/mac80211/chan.c:1862 ieee80211_vif_release_channel+0x1ad/0x220 net/mac80211/chan.c:1862 net/mac80211/chan.c:1862
Modules linked in:
CPU: 0 PID: 3601 Comm: syz-executor149 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ieee80211_vif_release_channel+0x1ad/0x220 net/mac80211/chan.c:1862 net/mac80211/chan.c:1862
Code: c1 ea 03 80 3c 02 00 0f 85 82 00 00 00 48 8b ab 10 06 00 00 e9 60 ff ff ff e8 ff 10 d6 f8 0f 0b e9 e2 fe ff ff e8 f3 10 d6 f8 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02
RSP: 0018:ffffc900029ff350 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801cf50c80 RCX: 0000000000000000
RDX: ffff88801d00ba00 RSI: ffffffff88a1a0dd RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff88a1a09c R11: 0000000000000000 R12: ffff88801cf51290
R13: 0000000000000001 R14: 00000000fffffff4 R15: 0000000000000000
FS:  0000555556cb8300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005643b512ad10 CR3: 000000001d4f5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ieee80211_start_ap+0x1b16/0x2780 net/mac80211/cfg.c:1267 net/mac80211/cfg.c:1267
 rdev_start_ap net/wireless/rdev-ops.h:158 [inline]
 rdev_start_ap net/wireless/rdev-ops.h:158 [inline] net/wireless/nl80211.c:5718
 nl80211_start_ap+0x288d/0x3dd0 net/wireless/nl80211.c:5718 net/wireless/nl80211.c:5718
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 net/netlink/genetlink.c:731
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] net/netlink/genetlink.c:792
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496 net/netlink/af_netlink.c:2496
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] net/netlink/af_netlink.c:1345
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg_nosec net/socket.c:704 [inline] net/socket.c:724
 sock_sendmsg+0xcf/0x120 net/socket.c:724 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f668292e069
Code: 97 01 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff775e50d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f668292e069
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000002 R09: 00007fff775e5110
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff775e5100
R13: 000000000000000e R14: 00000000ffffffff R15: 0000000000000000
 </TASK>


---
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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