[syzbot] [net?] kernel BUG in ipgre_header (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6abcf751bc08 net: airoha: Fix schedule while atomic in air..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=11cd819a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
dashboard link: https://syzkaller.appspot.com/bug?extid=7c134e1c3aa3283790b9
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/34ff92f72e89/disk-6abcf751.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d04633dc422e/vmlinux-6abcf751.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e0b0478317bd/bzImage-6abcf751.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7c134e...@syzkaller.appspotmail.com

skbuff: skb_under_panic: text:ffffffff89ea3cb7 len:2030915468 put:2030915372 head:ffff888058b43000 data:ffff887fdfa6e194 tail:0x120 end:0x6c0 dev:team0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:213!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 1322 Comm: kworker/1:9 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: mld mld_ifc_work
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213
Code: c7 60 9c 6f 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 ce 6a f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900040cf540 EFLAGS: 00010282
RAX: 0000000000000097 RBX: dffffc0000000000 RCX: 577f10acb7f51400
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000000006c0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bbae40 R12: ffff88805235f510
R13: ffff888058b43000 R14: ffff887fdfa6e194 R15: 0000000000000120
FS: 0000000000000000(0000) GS:ffff888125f21000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ea09156c0 CR3: 00000000760f2000 CR4: 00000000003526f0
Call Trace:
<TASK>
skb_under_panic net/core/skbuff.c:223 [inline]
skb_push+0xc3/0xe0 net/core/skbuff.c:2641
ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897
dev_hard_header include/linux/netdevice.h:3436 [inline]
neigh_connected_output+0x286/0x460 net/core/neighbour.c:1618
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318
mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855
mld_send_cr net/ipv6/mcast.c:2154 [inline]
mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213
Code: c7 60 9c 6f 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 ce 6a f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900040cf540 EFLAGS: 00010282
RAX: 0000000000000097 RBX: dffffc0000000000 RCX: 577f10acb7f51400
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000000006c0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bbae40 R12: ffff88805235f510
R13: ffff888058b43000 R14: ffff887fdfa6e194 R15: 0000000000000120
FS: 0000000000000000(0000) GS:ffff888125f21000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2de99d5d58 CR3: 00000000b0bfa000 CR4: 00000000003526f0


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 54e82e93ca93 Merge tag 'core_urgent_for_v6.19_rc4' of git:..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12bf583a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b

dashboard link: https://syzkaller.appspot.com/bug?extid=7c134e1c3aa3283790b9
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1718df92580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f7e922580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-54e82e93.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f3befb5f53a4/vmlinux-54e82e93.xz
kernel image: https://storage.googleapis.com/syzbot-assets/92820ca1dbd8/bzImage-54e82e93.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7c134e...@syzkaller.appspotmail.com

gre1: entered allmulticast mode
skbuff: skb_under_panic: text:ffffffff89ec2b07 len:-1825582908 put:-1825582932 head:ffff888040e65040 data:ffff887fadb68054 tail:0xd8 end:0x180 dev:bond0

------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:213!

Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5515 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014

RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213

Code: c7 60 b0 6f 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 4e 6a f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000294e720 EFLAGS: 00010282
RAX: 0000000000000098 RBX: dffffc0000000000 RCX: 52eb4dbabbc3e900

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: 0000000000000180 R08: ffffc9000294e487 R09: 1ffff92000529c90
R10: dffffc0000000000 R11: fffff52000529c91 R12: ffff8880125288d0
R13: ffff888040e65040 R14: ffff887fadb68054 R15: 00000000000000d8
FS: 0000555559b63500(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000556b723b4950 CR3: 0000000035eaf000 CR4: 0000000000352ef0

Call Trace:
<TASK>
skb_under_panic net/core/skbuff.c:223 [inline]
skb_push+0xc3/0xe0 net/core/skbuff.c:2641
ipgre_header+0x67/0x290 net/ipv4/ip_gre.c:897
dev_hard_header include/linux/netdevice.h:3436 [inline]

arp_create+0x3fd/0x990 net/ipv4/arp.c:578
arp_send_dst net/ipv4/arp.c:314 [inline]
arp_send+0xa5/0x190 net/ipv4/arp.c:328
inetdev_send_gratuitous_arp net/ipv4/devinet.c:1571 [inline]
inetdev_event+0x1156/0x15b0 net/ipv4/devinet.c:1638
notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
netif_open+0xfd/0x170 net/core/dev.c:1711
dev_open+0x125/0x260 net/core/dev_api.c:201
bond_enslave+0x6ca/0x3ac0 drivers/net/bonding/bond_main.c:1881
do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2963
rtnl_newlink_create+0x677/0xb00 net/core/rtnetlink.c:3854
__rtnl_newlink net/core/rtnetlink.c:3957 [inline]
rtnl_newlink+0x16e7/0x1c90 net/core/rtnetlink.c:4072
rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:742
____sys_sendmsg+0x505/0x820 net/socket.c:2592
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7febbb38f7c9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcc3087d58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007febbb5e5fa0 RCX: 00007febbb38f7c9
RDX: 0000000000000800 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007febbb413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007febbb5e5fa0 R14: 00007febbb5e5fa0 R15: 0000000000000003

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:213

Code: c7 60 b0 6f 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 4e 6a f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000294e720 EFLAGS: 00010282
RAX: 0000000000000098 RBX: dffffc0000000000 RCX: 52eb4dbabbc3e900

RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000

RBP: 0000000000000180 R08: ffffc9000294e487 R09: 1ffff92000529c90
R10: dffffc0000000000 R11: fffff52000529c91 R12: ffff8880125288d0
R13: ffff888040e65040 R14: ffff887fadb68054 R15: 00000000000000d8
FS: 0000555559b63500(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000055e030273048 CR3: 0000000035eaf000 CR4: 0000000000352ef0


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