Hello,
syzkaller hit the following crash on
e0e99813fb1d25fc20dab946d7bf6156a67dab5f
git://
git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See
https://goo.gl/kgGztJ
for information about syzkaller reproducers
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+36b06f...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
=============================
WARNING: suspicious RCU usage
4.15.0-rc6-next-20180102+ #86 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_core.c:2057 suspicious
rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u4:0/5:
#0: ((wq_completion)"%s""netns"){+.+.}, at: [<000000006581c2a2>]
process_one_work+0x71f/0x14a0 kernel/workqueue.c:2083
#1: (net_cleanup_work){+.+.}, at: [<0000000032ed8df0>]
process_one_work+0x757/0x14a0 kernel/workqueue.c:2087
#2: (net_mutex){+.+.}, at: [<000000004beb14d8>] cleanup_net+0x139/0x8b0
net/core/net_namespace.c:450
stack backtrace:
CPU: 0 PID: 5 Comm: kworker/u4:0 Not tainted 4.15.0-rc6-next-20180102+ #86
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+0x137/0x198 lib/dump_stack.c:53
lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585
ip_set_net_exit+0x2c6/0x480 net/netfilter/ipset/ip_set_core.c:2057
ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
cleanup_net+0x3f3/0x8b0 net/core/net_namespace.c:484
process_one_work+0x801/0x14a0 kernel/workqueue.c:2112
worker_thread+0xe0/0x1010 kernel/workqueue.c:2246
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
---
This bug is generated by a dumb bot. It may contain errors.
See
https://goo.gl/tpsmEJ for details.
Direct all questions to
syzk...@googlegroups.com.
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.