[syzbot] [net?] WARNING in NUM

From: syzbot
Date: Sat Dec 07 2024 - 00:10:36 EST

Hello,

syzbot found the following issue on:

HEAD commit: cdd30ebb1b9f module: Convert symbol namespace to string li..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=146c8330580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6851fe4f61792030
dashboard link: https://syzkaller.appspot.com/bug?extid=3f059ffbdd539a3f6bc9
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-cdd30ebb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/35bb9b3cd157/vmlinux-cdd30ebb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9c6bbf481907/bzImage-cdd30ebb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3f059ffbdd539a3f6bc9@xxxxxxxxxxxxxxxxxxxxxxxxx

Dec 3 05:04:02 syzkaller daemon.info dhcpcd[5653]: eth3: IAID d8:df:c9:55
Dec 3 05:04:02 syzkaller daemon.info dhcpcd[5653]: eth3: adding address fe80::7[ 49.690919][ T6466] ------------[ cut here ]------------
f27:c3e8:bb45:52[ 49.693207][ T6466] WARNING: CPU: 3 PID: 6466 at net/ipv6/ip6mr.c:419 ip6mr_free_table+0xbd/0x120 net/ipv6/ip6mr.c:419
df
Dec 3 05:04:02 [ 49.710042][ T6466] Code: 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 58 49 83 bc 24 c0 0e 00 00 00 74 09 e8 c4 c5 af f7 90 <0f> 0b 90 e8 bb c5 af f7 48 8d 7b 38 e8 22 86 9c f7 48 89 df be 0f
syzkaller kern.w[ 49.717312][ T6466] RSP: 0018:ffffc90003487bd8 EFLAGS: 00010293
arn kernel: [ [ 49.719598][ T6466] RAX: 0000000000000000 RBX: ffff888108508000 RCX: ffffffff89ea4014
49.690919][ T646[ 49.725534][ T6466] RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
6] ------------[[ 49.725548][ T6466] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88804e965ac0
cut here ]-----[ 49.725561][ T6466] R13: ffff888108508000 R14: ffff888108508008 R15: dead000000000100
-------
Dec 3 05:04:02 [ 49.739536][ T6466] CR2: 00007f4fd5157580 CR3: 0000000035ea8000 CR4: 0000000000352ef0
syzkaller kern.w[ 49.742428][ T6466] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
arn kernel: [ [ 49.746956][ T6466] Call Trace:
49.693207][ T646[ 49.748809][ T6466] ? __warn+0xea/0x3c0 kernel/panic.c:746
6] WARNING: CPU:[ 49.750217][ T6466] ? ip6mr_free_table+0xbd/0x120 net/ipv6/ip6mr.c:419
3 PID: 6466 at [ 49.751877][ T6466] ? __report_bug lib/bug.c:199 [inline]
3 PID: 6466 at [ 49.751877][ T6466] ? report_bug+0x3c0/0x580 lib/bug.c:219
net/ipv6/ip6mr.c[ 49.751908][ T6466] ? exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309
:419 ip6mr_free_[ 49.751922][ T6466] ? asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
table+0xbd/0x120[ 49.759463][ T6466] ? ip6mr_free_table+0xbc/0x120 net/ipv6/ip6mr.c:419

Dec 3 05:04:02 syzkaller kern[ 49.762545][ T6466] ? ip6mr_free_table+0xbc/0x120 net/ipv6/ip6mr.c:419
.warn kernel: [ [ 49.765091][ T6466] ip6mr_rules_exit+0x176/0x2d0 net/ipv6/ip6mr.c:283
49.696818][ T6[ 49.767196][ T6466] ip6mr_net_exit_batch+0x53/0xa0 net/ipv6/ip6mr.c:1388
466] Modules lin[ 49.768971][ T6466] ? __pfx_ip6mr_net_exit_batch+0x10/0x10 net/ipv6/ip6mr.c:285
ked in:
Dec 3 05:04:02 [ 49.769038][ T6466] setup_net+0x4fe/0x860 net/core/net_namespace.c:394
syzkaller kern.w[ 49.769059][ T6466] ? __pfx_setup_net+0x10/0x10 net/core/net_namespace.c:185
arn kernel: [ [ 49.778049][ T6466] ? __down_read_common kernel/locking/rwsem.c:1255 [inline]
arn kernel: [ [ 49.778049][ T6466] ? __down_read_killable kernel/locking/rwsem.c:1271 [inline]
arn kernel: [ [ 49.778049][ T6466] ? down_read_killable+0xcc/0x380 kernel/locking/rwsem.c:1549
49.699801][ T646[ 49.781754][ T6466] ? lockdep_init_map_waits include/linux/lockdep.h:135 [inline]
49.699801][ T646[ 49.781754][ T6466] ? lockdep_init_map_wait include/linux/lockdep.h:142 [inline]
49.699801][ T646[ 49.781754][ T6466] ? __raw_spin_lock_init+0x3a/0x110 kernel/locking/spinlock_debug.c:25
6] CPU: 3 UID: 0 PID: 6466 Comm: syz.2.106 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0


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