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Subjectgeneral protection fault in cbs_destroy
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Hello,

syzbot found the following crash on:

HEAD commit: 3b47fd5c Merge tag 'nfs-for-5.3-4' of git://git.linux-nfs...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14854e71600000
kernel config: https://syzkaller.appspot.com/x/.config?x=144488c6c6c6d2b6
dashboard link: https://syzkaller.appspot.com/bug?extid=3a8d6a998cbb73bcf337
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17998f9e600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10421efa600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3a8d6a998cbb73bcf337@syzkaller.appspotmail.com

8021q: adding VLAN 0 to HW filter on device batadv0
netlink: 24 bytes leftover after parsing attributes in process
`syz-executor457'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9249 Comm: syz-executor457 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x6b/0x100 lib/list_debug.c:51
Code: 4c 89 f7 e8 97 d0 58 fe 48 ba 00 01 00 00 00 00 ad de 49 8b 1e 48 39
d3 74 54 48 83 c2 22 49 39 d7 74 5e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00
74 08 4c 89 ff e8 66 d0 58 fe 49 8b 17 4c 39 f2 75
RSP: 0018:ffff88809898f568 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: dead000000000122 RSI: 0000000000000004 RDI: ffff88809fb5a7e8
RBP: ffff88809898f588 R08: dffffc0000000000 R09: ffffed1013131ea8
R10: ffffed1013131ea8 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88809fb5a480 R14: ffff88809fb5a7e0 R15: 0000000000000000
FS: 00005555568cb880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000610 CR3: 00000000a3968000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__list_del_entry include/linux/list.h:131 [inline]
list_del include/linux/list.h:139 [inline]
cbs_destroy+0x85/0x3e0 net/sched/sch_cbs.c:435
qdisc_create+0xff8/0x13e0 net/sched/sch_api.c:1302
tc_modify_qdisc+0x989/0x1ea0 net/sched/sch_api.c:1652
rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5223
netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5241
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x787/0x900 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x993/0xc50 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:637 [inline]
sock_sendmsg net/socket.c:657 [inline]
___sys_sendmsg+0x60d/0x910 net/socket.c:2311
__sys_sendmsg net/socket.c:2356 [inline]
__do_sys_sendmsg net/socket.c:2365 [inline]
__se_sys_sendmsg net/socket.c:2363 [inline]
__x64_sys_sendmsg+0x17c/0x200 net/socket.c:2363
do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441b59
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0f 83 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe29572cf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441b59
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 00007ffe29572d10 R08: 0000000001bbbbbb R09: 0000000001bbbbbb
R10: 0000000001bbbbbb R11: 0000000000000246 R12: 0000000000000000
R13: 00000000004030f0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 226030e488aca074 ]---
RIP: 0010:__list_del_entry_valid+0x6b/0x100 lib/list_debug.c:51
Code: 4c 89 f7 e8 97 d0 58 fe 48 ba 00 01 00 00 00 00 ad de 49 8b 1e 48 39
d3 74 54 48 83 c2 22 49 39 d7 74 5e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00
74 08 4c 89 ff e8 66 d0 58 fe 49 8b 17 4c 39 f2 75
RSP: 0018:ffff88809898f568 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: dead000000000122 RSI: 0000000000000004 RDI: ffff88809fb5a7e8
RBP: ffff88809898f588 R08: dffffc0000000000 R09: ffffed1013131ea8
R10: ffffed1013131ea8 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88809fb5a480 R14: ffff88809fb5a7e0 R15: 0000000000000000
FS: 00005555568cb880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000610 CR3: 00000000a3968000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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