kernel BUG in ip6gre_header

Status: upstream: reported C repro on 2023/06/14 11:11
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+a7412cb792862ae2cf6e@syzkaller.appspotmail.com
First crash: 1152d, last: 697d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/06/14 upstream (ToT) b6dad5178cea C [report] BUG: MAX_LOCKDEP_CHAINS too low!
2026/07/13 upstream (ToT) 0f26556c5eee C Failed due to an error; will retry later
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in ip6gre_header (6) net -1 syz, C 127 223d 241d 29/29 fixed on 2026/01/26 05:07
linux-4.19 kernel BUG at net/core/skbuff.c:LINE! -1 syz, C unreliable 494 1441d 2661d 0/1 upstream: reported C repro on 2019/04/27 20:12
upstream kernel BUG in ip6gre_header (2) net -1 syz, C 2 1031d 1045d 25/29 fixed on 2024/01/20 21:18
upstream kernel BUG in ip6gre_header net -1 syz, C 5 1082d 1152d 23/29 fixed on 2023/09/28 17:51
upstream kernel BUG in ip6gre_header (5) net -1 1 734d 734d 0/29 closed as invalid on 2024/08/29 14:58
upstream kernel BUG in ip6gre_header (3) net -1 1 915d 915d 0/29 closed as invalid on 2024/03/01 17:31
upstream kernel BUG in ip6gre_header (4) net -1 1 823d 823d 0/29 closed as invalid on 2024/06/03 15:58
upstream kernel BUG in llc_sap_action_send_xid_c net -1 syz, C error 61 1734d 1948d 20/29 fixed on 2021/11/10 00:50
upstream kernel BUG in pskb_expand_head net -1 syz, C done 1600 1277d 1728d 22/29 fixed on 2023/02/25 08:02
▶ ▼ Fix bisection attempts (13)
Created Duration User Patch Repo Result
2024/10/15 01:59 0m bisect fix linux-6.1.y error job log
2024/09/11 16:12 2h27m bisect fix linux-6.1.y OK (0) job log log
2024/08/07 22:55 2h06m bisect fix linux-6.1.y OK (0) job log log
2024/06/28 21:20 2h09m bisect fix linux-6.1.y OK (0) job log log
2024/05/20 10:29 2h14m bisect fix linux-6.1.y OK (0) job log log
2024/04/16 23:50 4h30m bisect fix linux-6.1.y OK (0) job log log
2024/03/13 19:46 2h18m bisect fix linux-6.1.y OK (0) job log log
2024/02/03 15:24 2h13m (2) bisect fix linux-6.1.y OK (0) job log log
2023/12/31 16:57 2h11m bisect fix linux-6.1.y OK (0) job log log
2023/12/01 10:40 2h20m bisect fix linux-6.1.y OK (0) job log log
2023/10/31 06:38 2h26m bisect fix linux-6.1.y OK (0) job log log
2023/09/30 02:01 2h20m bisect fix linux-6.1.y OK (0) job log log
2023/07/30 12:02 3h42m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
skbuff: skb_under_panic: text:ffff8000110d7388 len:44 put:40 head:ffff0000cf3ab800 data:ffff0000cf3ab7ea tail:0x16 end:0xc0 dev:bond1
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:120!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3892 Comm: dhcpcd Not tainted 6.1.33-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : skb_panic net/core/skbuff.c:116 [inline]
pc : skb_under_panic+0x13c/0x140 net/core/skbuff.c:130
lr : skb_panic net/core/skbuff.c:116 [inline]
lr : skb_under_panic+0x13c/0x140 net/core/skbuff.c:130
sp : ffff8000200672c0
x29: ffff8000200672d0 x28: 1fffe00018c349b1 x27: dfff800000000000
x26: ffff0000d2720290 x25: 0000000000000016 x24: ffff0000cf3ab7ea
x23: ffff0000cf3ab800 x22: 000000000000002c x21: 00000000000000c0
x20: 0000000000000028 x19: ffff8000110d7388 x18: ffff800020066820
x17: 0000000000000000 x16: ffff800012102bf4 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001
x11: ff80800008345658 x10: 0000000000000000 x9 : e1f99bcd03577e00
x8 : e1f99bcd03577e00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020066bd8 x4 : ffff8000156a2a40 x3 : ffff8000085879f4
x2 : 0000000000000001 x1 : 0000000100000201 x0 : 0000000000000085
Call trace:
 skb_panic net/core/skbuff.c:116 [inline]
 skb_under_panic+0x13c/0x140 net/core/skbuff.c:130
 skb_push+0x104/0x11c net/core/skbuff.c:2181
 ip6gre_header+0xbc/0x67c net/ipv6/ip6_gre.c:1406
 dev_hard_header include/linux/netdevice.h:3070 [inline]
 lapbeth_data_transmit+0x1c4/0x298 drivers/net/wan/lapbether.c:257
 lapb_data_transmit+0x8c/0xb0 net/lapb/lapb_iface.c:447
 lapb_transmit_buffer+0x178/0x204 net/lapb/lapb_out.c:149
 lapb_send_control+0x220/0x320 net/lapb/lapb_subr.c:251
 lapb_establish_data_link+0x94/0xec
 lapb_device_event+0x348/0x4e0
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455
 __dev_notify_flags+0x2ac/0x534
 dev_change_flags+0xc8/0x154 net/core/dev.c:8624
 devinet_ioctl+0x858/0x17e4 net/ipv4/devinet.c:1146
 inet_ioctl+0x2ac/0x4d8 net/ipv4/af_inet.c:982
 sock_do_ioctl+0x134/0x2dc net/socket.c:1174
 sock_ioctl+0x4ec/0x858 net/socket.c:1291
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: aa1803e6 aa1903e7 a90023f5 947506cf (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/14 11:10 linux-6.1.y 2f3918bc53fb d2ee9228 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ip6gre_header
* Struck through repros no longer work on HEAD.