[syzbot] WARNING in batadv_v_ogm_free

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 2f111a6fd5b5 Merge tag 'ceph-for-5.15-rc7' of git://github..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=121d909f300000
kernel config: https://syzkaller.appspot.com/x/.config?x=d95853dad8472c91
dashboard link: https://syzkaller.appspot.com/bug?extid=b6a62d5cb9fe05a0e3a3
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b6a62d...@syzkaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0
WARNING: CPU: 0 PID: 9723 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline]
WARNING: CPU: 0 PID: 9723 at lib/debugobjects.c:508 debug_object_assert_init+0x1fa/0x250 lib/debugobjects.c:895
Modules linked in:
CPU: 0 PID: 9723 Comm: syz-executor.5 Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline]
RIP: 0010:debug_object_assert_init+0x1fa/0x250 lib/debugobjects.c:895
Code: e8 4b 15 b8 fd 4c 8b 45 00 48 c7 c7 a0 31 b4 8a 48 c7 c6 00 2e b4 8a 48 c7 c2 e0 33 b4 8a 31 c9 49 89 d9 31 c0 e8 b6 c6 36 fd <0f> 0b ff 05 3a 5c c5 09 48 83 c5 38 48 89 e8 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc90015a06698 EFLAGS: 00010046
RAX: ccc2ef1263c32100 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90015ff3000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffffff8a512d00 R08: ffffffff81693402 R09: ffffed1017383f2c
R10: ffffed1017383f2c R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a4325898 R14: 0000000000000000 R15: ffffffff90bebb30
FS: 00007fb87671b700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005573fb61a270 CR3: 000000009b076000 CR4: 00000000003506f0
Call Trace:
debug_timer_assert_init kernel/time/timer.c:739 [inline]
debug_assert_init kernel/time/timer.c:784 [inline]
del_timer+0xa5/0x3d0 kernel/time/timer.c:1204
try_to_grab_pending+0x151/0xbb0 kernel/workqueue.c:1270
__cancel_work_timer+0x14c/0x710 kernel/workqueue.c:3129
batadv_v_ogm_free+0x2e/0xc0 net/batman-adv/bat_v_ogm.c:1076
batadv_mesh_free+0x67/0x140 net/batman-adv/main.c:244
batadv_mesh_init+0x4e5/0x550 net/batman-adv/main.c:226
batadv_softif_init_late+0x8fe/0xd70 net/batman-adv/soft-interface.c:804
register_netdevice+0x826/0x1c30 net/core/dev.c:10229
__rtnl_newlink net/core/rtnetlink.c:3458 [inline]
rtnl_newlink+0x14b3/0x1d10 net/core/rtnetlink.c:3506
rtnetlink_rcv_msg+0x934/0xe60 net/core/rtnetlink.c:5572
netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2510
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0xa29/0xe50 net/netlink/af_netlink.c:1935
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
____sys_sendmsg+0x5b9/0x910 net/socket.c:2409
___sys_sendmsg net/socket.c:2463 [inline]
__sys_sendmsg+0x36f/0x450 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fb8791a5a39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb87671b188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb8792a8f60 RCX: 00007fb8791a5a39
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00007fb87671b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fffd6c2d8ef R14: 00007fb87671b300 R15: 0000000000022000


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[Pavel Skripkin]

On 10/22/21 02:19, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 2f111a6fd5b5 Merge tag 'ceph-for-5.15-rc7' of git://github..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=121d909f300000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d95853dad8472c91
> dashboard link: https://syzkaller.appspot.com/bug?extid=b6a62d5cb9fe05a0e3a3
> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+b6a62d...@syzkaller.appspotmail.com
>

Looks like bug on error handling path in batadv_mesh_init(). Must be
fixed by my batman-adv patch.

#syz fix: net: batman-adv: fix error handling




With regards,
Pavel Skripkin