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Date: Tue, 06 Feb 2018 09:58:02 -0800
From: syzbot <syzbot+63682ce11532e0da2b9d@...kaller.appspotmail.com>
To: christian.brauner@...ntu.com, daniel@...earbox.net,
davem@...emloft.net, dsahern@...il.com, fw@...len.de,
jakub.kicinski@...ronome.com, jbenc@...hat.com,
linux-kernel@...r.kernel.org, lucien.xin@...il.com,
netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
vyasevich@...il.com
Subject: possible deadlock in rtnl_lock (3)
Hello,
syzbot hit the following crash on net-next commit
617aebe6a97efa539cc4b8a52adccd89596e6be0 (Sun Feb 4 00:25:42 2018 +0000)
Merge tag 'usercopy-v4.16-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
So far this crash happened 2510 times on net-next, upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+63682ce11532e0da2b9d@...kaller.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: possible circular locking dependency detected
4.15.0+ #221 Not tainted
------------------------------------------------------
syzkaller414214/4173 is trying to acquire lock:
(rtnl_mutex){+.+.}, at: [<000000003cc93f9b>] rtnl_lock+0x17/0x20
net/core/rtnetlink.c:74
but task is already holding lock:
(&xt[i].mutex){+.+.}, at: [<0000000059cfac75>]
xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&xt[i].mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041
xt_request_find_table_lock+0x28/0xc0 net/netfilter/x_tables.c:1088
get_info+0x154/0x690 net/ipv6/netfilter/ip6_tables.c:989
do_ipt_get_ctl+0x159/0xac0 net/ipv4/netfilter/ip_tables.c:1699
nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:122
ip_getsockopt+0x15c/0x220 net/ipv4/ip_sockglue.c:1571
tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3359
sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2934
SYSC_getsockopt net/socket.c:1880 [inline]
SyS_getsockopt+0x178/0x340 net/socket.c:1862
entry_SYSCALL_64_fastpath+0x29/0xa0
-> #1 (sk_lock-AF_INET){+.+.}:
lock_sock_nested+0xc2/0x110 net/core/sock.c:2777
lock_sock include/net/sock.h:1463 [inline]
do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646
ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252
udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
SYSC_setsockopt net/socket.c:1849 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1828
entry_SYSCALL_64_fastpath+0x29/0xa0
-> #0 (rtnl_mutex){+.+.}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673
clusterip_config_entry_put net/ipv4/netfilter/ipt_CLUSTERIP.c:114
[inline]
clusterip_tg_destroy+0x389/0x6e0
net/ipv4/netfilter/ipt_CLUSTERIP.c:518
cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654
__do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089
do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline]
do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259
tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
SYSC_setsockopt net/socket.c:1849 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1828
entry_SYSCALL_64_fastpath+0x29/0xa0
other info that might help us debug this:
Chain exists of:
rtnl_mutex --> sk_lock-AF_INET --> &xt[i].mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&xt[i].mutex);
lock(sk_lock-AF_INET);
lock(&xt[i].mutex);
lock(rtnl_mutex);
*** DEADLOCK ***
1 lock held by syzkaller414214/4173:
#0: (&xt[i].mutex){+.+.}, at: [<0000000059cfac75>]
xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1041
stack backtrace:
CPU: 1 PID: 4173 Comm: syzkaller414214 Not tainted 4.15.0+ #221
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223
check_prev_add kernel/locking/lockdep.c:1863 [inline]
check_prevs_add kernel/locking/lockdep.c:1976 [inline]
validate_chain kernel/locking/lockdep.c:2417 [inline]
__lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1673
clusterip_config_entry_put net/ipv4/netfilter/ipt_CLUSTERIP.c:114 [inline]
clusterip_tg_destroy+0x389/0x6e0 net/ipv4/netfilter/ipt_CLUSTERIP.c:518
cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654
__do_replace+0x79d/0xa50 net/ipv4/netfilter/ip_tables.c:1089
do_replace net/ipv4/netfilter/ip_tables.c:1145 [inline]
do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1675
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259
tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905
sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975
SYSC_setsockopt net/socket.c:1849 [inline]
SyS_setsockopt+0x189/0x360 net/socket.c:1828
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x4443da
RSP: 002b:00007ffe9e2704d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00000000006cc100 RCX: 00000000004443da
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006cc100 R08: 00000000000002d8 R09: 000000000106b880
R10: 00000000006cc528 R11: 0000000000000206 R12: 0000000000000003
R13: 00000000006cf0a8 R14: 00000000006cf050 R15: 00000000004a338e
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.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.
View attachment "raw.log.txt" of type "text/plain" (77368 bytes)
View attachment "repro.syz.txt" of type "text/plain" (1345 bytes)
View attachment "repro.c.txt" of type "text/plain" (20009 bytes)
View attachment "config.txt" of type "text/plain" (136942 bytes)
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