syzbot


WARNING in l2tp_exit_net

Status: upstream: reported syz repro on 2024/09/13 02:49
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+332fe1e67018625f63c9@syzkaller.appspotmail.com
Fix commit: 5d066766c5f1 net/l2tp: fix warning in l2tp_exit_net found by syzbot
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 151d, last: 62d
Cause bisection: introduced by (bisect log) :
commit 73d33bd063c4cfef3db17f9bec3d202928ed8631
Author: James Chapman <jchapman@katalix.com>
Date: Fri Aug 23 14:22:57 2024 +0000

  l2tp: avoid using drain_workqueue in l2tp_pre_exit_net

Crash: WARNING in l2tp_exit_net (log)
Repro: syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
[PATCH net] net/l2tp: fix warning in l2tp_exit_net found by syzbot 2 (2) 2024/11/26 09:00
[syzbot] [net?] WARNING in l2tp_exit_net 2 (7) 2024/11/15 23:03
[PATCH RFC] l2tp: fix warning in l2tp_exit_net found by syzbot 1 (1) 2024/11/07 17:31
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/11/06 18:07 21m jchapman@katalix.com patch git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git ccb35037c48a OK log
2024/11/06 17:21 21m jchapman@katalix.com patch git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git ccb35037c48a OK log

Sample crash report:
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1153 at net/l2tp/l2tp_core.c:1881 l2tp_exit_net+0x165/0x170 net/l2tp/l2tp_core.c:1881
Modules linked in:
CPU: 1 UID: 0 PID: 1153 Comm: kworker/u8:5 Not tainted 6.12.0-rc5-syzkaller-01164-gccb35037c48a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
RIP: 0010:l2tp_exit_net+0x165/0x170 net/l2tp/l2tp_core.c:1881
Code: 0f 0b 90 e9 3b ff ff ff e8 b8 31 a5 f6 eb 05 e8 b1 31 a5 f6 90 0f 0b 90 e9 7a ff ff ff e8 a3 31 a5 f6 eb 05 e8 9c 31 a5 f6 90 <0f> 0b 90 eb b5 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90004177a98 EFLAGS: 00010293
RAX: ffffffff8aefa87d RBX: ffff888076669088 RCX: ffff8880277abc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90004177bb0 R08: ffffffff8bc11bb6 R09: 1ffffffff203a5d5
R10: dffffc0000000000 R11: fffffbfff203a5d6 R12: dffffc0000000000
R13: 1ffffffff1fdb678 R14: ffff888076669130 R15: ffff888076669040
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca636d388 CR3: 0000000026e10000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x802/0xcc0 net/core/net_namespace.c:633
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (219):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/06 05:59 net-next ccb35037c48a 3a465482 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/11/28 17:37 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/28 16:08 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/28 02:00 upstream aaf20f870da0 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in l2tp_exit_net
2024/11/27 09:50 upstream 7eef7e306d3c 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/27 05:55 upstream 7eef7e306d3c 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/27 00:52 upstream 7eef7e306d3c 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/26 10:03 upstream 2c22dc1ee3a1 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/26 09:57 upstream 2c22dc1ee3a1 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/26 01:28 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/25 18:45 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/24 14:27 upstream 9f16d5e6f220 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/24 13:26 upstream 9f16d5e6f220 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/22 19:33 upstream 28eb75e178d3 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/21 20:18 upstream fcc79e1714e8 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/21 11:09 upstream 43fb83c17ba2 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in l2tp_exit_net
2024/11/20 15:50 upstream bf9aa14fc523 4fca1650 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/19 04:47 upstream c6d64479d609 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/17 22:59 upstream f66d6acccbc0 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in l2tp_exit_net
2024/11/16 20:36 upstream e8bdb3c8be08 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/14 18:41 upstream 0a9b9d17f3a7 77f3eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/13 14:02 upstream 3022e9d00ebe 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in l2tp_exit_net
2024/11/13 08:18 upstream 3022e9d00ebe 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/11 07:39 upstream a9cda7c0ffed 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in l2tp_exit_net
2024/11/10 17:07 upstream de2f378f2b77 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in l2tp_exit_net
2024/11/10 10:53 upstream de2f378f2b77 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in l2tp_exit_net
2024/11/09 23:14 upstream da4373fbcf00 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in l2tp_exit_net
2024/11/28 19:02 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/28 05:41 upstream aaf20f870da0 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/27 23:54 upstream aaf20f870da0 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/26 04:44 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/26 03:22 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/22 21:39 upstream 28eb75e178d3 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/22 16:01 upstream 28eb75e178d3 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/20 09:23 upstream a5c93bfec0be 7d02db5a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/18 16:41 upstream adc218676eef 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/16 05:51 upstream f868cd251776 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/14 17:28 upstream 0a9b9d17f3a7 77f3eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/11/10 09:44 upstream de2f378f2b77 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in l2tp_exit_net
2024/10/20 14:22 upstream 715ca9dd687f cd6fc0a3 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in l2tp_exit_net
2024/11/20 11:22 upstream bf9aa14fc523 7d02db5a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2tp_exit_net
2024/11/10 00:45 upstream da4373fbcf00 6b856513 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2tp_exit_net
2024/11/10 00:19 upstream da4373fbcf00 6b856513 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in l2tp_exit_net
2024/11/13 04:05 net 2b99b2532593 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in l2tp_exit_net
2024/11/25 16:05 net-next fcc79e1714e8 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/11/22 05:04 net-next fcc79e1714e8 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/11/20 17:19 net-next dd7207838d38 4fca1650 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/11/19 18:38 net-next dd7207838d38 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/09/11 11:04 net-next f3b6129b7d25 9326a104 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/09/09 02:40 net-next c259acab839e 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in l2tp_exit_net
2024/11/23 11:32 linux-next cfba9f07a1d6 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in l2tp_exit_net
2024/11/20 00:06 linux-next 414c97c966b6 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in l2tp_exit_net
2024/11/12 16:58 linux-next 929beafbe7ac 75bb1b32 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in l2tp_exit_net
2024/12/06 19:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7b1d1d4cfac0 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in l2tp_exit_net
2024/11/21 08:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7b1d1d4cfac0 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in l2tp_exit_net
2024/11/18 19:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7b1d1d4cfac0 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in l2tp_exit_net
2024/11/13 21:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8e9a54d7181b a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in l2tp_exit_net
2024/11/13 20:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8e9a54d7181b a8c99394 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in l2tp_exit_net
2024/11/11 16:41 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 563047e691f2 97fe5517 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in l2tp_exit_net
* Struck through repros no longer work on HEAD.