WARNING in xfrm_policy_fini

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 3eb2ce825ea1 Linux 4.16-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1132989b800000
kernel config: https://syzkaller.appspot.com/x/.config?x=8addcf4530d93e53
dashboard link: https://syzkaller.appspot.com/bug?extid=9bce6db6c82f06b85d8b
compiler: gcc (GCC) 7.1.1 20170620

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9bce6d...@syzkaller.appspotmail.com

bond0 (unregistering): Released all slaves
WARNING: CPU: 1 PID: 7312 at net/xfrm/xfrm_policy.c:2925
xfrm_policy_fini+0x414/0x560 net/xfrm/xfrm_policy.c:2925
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7312 Comm: kworker/u4:7 Not tainted 4.16.0-rc7+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x24d lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x1f4/0x2b0 lib/bug.c:186
fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:xfrm_policy_fini+0x414/0x560 net/xfrm/xfrm_policy.c:2925
RSP: 0018:ffff8801b25d70d8 EFLAGS: 00010293
RAX: ffff8801b129c540 RBX: ffff8801b5608200 RCX: ffffffff8587ff74
RDX: 0000000000000000 RSI: 1ffff100362539c5 RDI: ffffffff87acabf8
RBP: ffff8801b25d7260 R08: 1ffff100364badd1 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100364bae27
R13: ffff8801b25d7238 R14: ffff8801b56096f0 R15: ffff8801d71c5820
xfrm_net_exit+0x1d/0x70 net/xfrm/xfrm_policy.c:2980
ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
cleanup_net+0x6a1/0xcb0 net/core/net_namespace.c:517
process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
worker_thread+0x223/0x1990 kernel/workqueue.c:2247
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: a3b22b9f11d9 Linux 5.0-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e3d4d0c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f
dashboard link: https://syzkaller.appspot.com/bug?extid=9bce6db6c82f06b85d8b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177317a8c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9bce6d...@syzkaller.appspotmail.com

bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0

bond0 (unregistering): Released all slaves

cgroup: fork rejected by pids controller in /syz3
cgroup: fork rejected by pids controller in /syz2
WARNING: CPU: 1 PID: 31 at net/xfrm/xfrm_policy.c:3871
xfrm_policy_fini+0x30c/0x3a0 net/xfrm/xfrm_policy.c:3871

Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 31 Comm: kworker/u4:2 Not tainted 5.0.0-rc7 #77

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:

__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2cb/0x65c kernel/panic.c:214
__warn.cold+0x20/0x45 kernel/panic.c:571
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
kobject: 'loop1' (00000000fd200829): kobject_uevent_env
RIP: 0010:xfrm_policy_fini+0x30c/0x3a0 net/xfrm/xfrm_policy.c:3871
Code: c3 e8 b8 e9 72 fb 0f 0b e9 49 fe ff ff e8 ac e9 72 fb 0f 0b e9 cd fd
ff ff e8 a0 e9 72 fb 0f 0b e9 00 ff ff ff e8 94 e9 72 fb <0f> 0b e9 62 fd
ff ff e8 98 e8 a9 fb e9 7d fe ff ff 4c 89 ff e8 ab
kobject: 'loop1' (00000000fd200829): fill_kobj_path: path
= '/devices/virtual/block/loop1'
RSP: 0018:ffff8880a9a8fbb0 EFLAGS: 00010293
RAX: ffff8880a9a82100 RBX: ffff88808e30dbf0 RCX: 1ffff1101535053e
RDX: 0000000000000000 RSI: ffffffff85fcf7ec RDI: ffff8880a9a8297c
RBP: ffff8880a9a8fbf0 R08: ffff8880a9a82100 R09: ffff8880a9a829f0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808e30c080
R13: ffff8880a9a8fcc8 R14: ffffffff893d5eb8 R15: dffffc0000000000
xfrm_net_exit+0x1d/0x70 net/xfrm/xfrm_policy.c:3931
ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
kobject: 'loop1' (00000000fd200829): kobject_uevent_env
kobject: 'loop1' (00000000fd200829): fill_kobj_path: path
= '/devices/virtual/block/loop1'
cgroup: fork rejected by pids controller in /syz1
process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
worker_thread+0x98/0xe40 kernel/workqueue.c:2319
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.