Hello,

syzbot found the following issue on:

HEAD commit: 44cc24b04bed Merge tag 'wireless-drivers-next-2021-10-07' .. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=130661b8b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=97f67871098c6901 dashboard link: https://syzkaller.appspot.com/bug?extid=0ef06384b5f39a16ebb9 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=1361e884b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1472de98b00000

The issue was bisected to:

commit 9ee11f0fff205b4b3df9750bff5e94f97c71b6a0 Author: Justin Iurman justin.iurman@uliege.be Date: Tue Jul 20 19:42:57 2021 +0000

ipv6: ioam: Data plane support for Pre-allocated Trace

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12c661b8b00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11c661b8b00000 console output: https://syzkaller.appspot.com/x/log.txt?x=16c661b8b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0ef06384b5f39a16ebb9@syzkaller.appspotmail.com Fixes: 9ee11f0fff20 ("ipv6: ioam: Data plane support for Pre-allocated Trace")

R13: 00007ffc310f3710 R14: 00007ffc310f3760 R15: 0000000000000001 ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0 WARNING: CPU: 1 PID: 6548 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 1 PID: 6548 Comm: syz-executor580 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd c0 3e e4 89 4c 89 ee 48 c7 c7 c0 32 e4 89 e8 29 8d 16 05 <0f> 0b 83 05 55 18 91 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc90002bdee90 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: ffff88801c395580 RSI: ffffffff815dbbc8 RDI: fffff5200057bdc4 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d596e R11: 0000000000000000 R12: ffffffff898de200 R13: ffffffff89e43940 R14: ffffffff8164b870 R15: 1ffff9200057bddd FS: 000055555617e300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f868a8856c0 CR3: 0000000024660000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_object_assert_init lib/debugobjects.c:895 [inline] debug_object_assert_init+0x1f4/0x2e0 lib/debugobjects.c:866 debug_timer_assert_init kernel/time/timer.c:739 [inline] debug_assert_init kernel/time/timer.c:784 [inline] del_timer+0x6d/0x110 kernel/time/timer.c:1204 try_to_grab_pending+0x6d/0xd0 kernel/workqueue.c:1270 __cancel_work_timer+0xa6/0x570 kernel/workqueue.c:3129 batadv_v_ogm_free+0x1f/0xd0 net/batman-adv/bat_v_ogm.c:1076 batadv_mesh_free+0x75/0x170 net/batman-adv/main.c:244 batadv_mesh_init+0x62f/0x710 net/batman-adv/main.c:226 batadv_softif_init_late+0xad4/0xdd0 net/batman-adv/soft-interface.c:804 register_netdevice+0x51e/0x1500 net/core/dev.c:10236 batadv_softif_newlink+0x6e/0x90 net/batman-adv/soft-interface.c:1068 __rtnl_newlink+0x106d/0x1750 net/core/rtnetlink.c:3458 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2485 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f4cb72c2829 Code: b2 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc310f36a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4cb72c2829 RDX: 000000000000ad2a RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007ffc310f3710 R08: 0000000000000000 R09: 4b6ae4f95a5de394 R10: 0000000000007812 R11: 0000000000000246 R12: 0000000000000005 R13: 00007ffc310f3710 R14: 00007ffc310f3760 R15: 0000000000000001

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