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Message-ID: <94eb2c06cb284308e30564ccf9b9@google.com>
Date: Fri, 09 Feb 2018 12:00:01 -0800
From: syzbot <syzbot+b743957adcee51f5e0e3@...kaller.appspotmail.com>
To: davem@...emloft.net, dvyukov@...gle.com, ebiggers3@...il.com,
jon.maloy@...csson.com, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com
Subject: WARNING: suspicious RCU usage in tipc_bearer_find
syzbot has found reproducer for 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 13 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+b743957adcee51f5e0e3@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.
audit: type=1400 audit(1518206230.395:8): avc: denied { create } for
pid=4164 comm="syzkaller756462"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
=============================
audit: type=1400 audit(1518206230.396:9): avc: denied { write } for
pid=4164 comm="syzkaller756462"
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tclass=netlink_generic_socket permissive=1
WARNING: suspicious RCU usage
4.15.0+ #221 Not tainted
-----------------------------
net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
2 locks held by syzkaller756462/4164:
#0: (cb_lock){++++}, at: [<000000003bb01113>] genl_rcv+0x19/0x40
net/netlink/genetlink.c:634
#1: (genl_mutex){+.+.}, at: [<000000002e321e71>] genl_lock
net/netlink/genetlink.c:33 [inline]
#1: (genl_mutex){+.+.}, at: [<000000002e321e71>] genl_rcv_msg+0x115/0x140
net/netlink/genetlink.c:622
stack backtrace:
CPU: 0 PID: 4164 Comm: syzkaller756462 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
lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4592
tipc_bearer_find+0x2b4/0x3b0 net/tipc/bearer.c:177
tipc_nl_compat_link_set+0x329/0x9f0 net/tipc/netlink_compat.c:729
__tipc_nl_compat_doit net/tipc/netlink_compat.c:288 [inline]
tipc_nl_compat_doit+0x15b/0x670 net/tipc/netlink_compat.c:335
tipc_nl_compat_handle net/tipc/netlink_compat.c:1119 [inline]
tipc_nl_compat_recv+0x1135/0x18f0 net/tipc/netlink_compat.c:1201
genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:599
genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:624
netlink_rcv_skb+0x14b/0x380 net/netlink/af_netlink.c:2442
genl_rcv+0x28/0x40 net/netlink/genetlink.c:635
netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline]
netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334
netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:640
___sys_sendmsg+0x767/0x8b0 net/socket.c:2046
__sys_sendmsg+0xe5/0x210 net/socket.c:2080
SYSC_sendmsg net/socket.c:2091 [inline]
SyS_sendmsg+0x2d/0x50 net/socket.c:2087
entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x43fd69
RSP: 002b:00007fff09979378 EFLAGS: 00000203 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd69
RDX: 0000000000000000 RSI: 0000000020003000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000401690
R13: 0000000000401720 R14: 0000000000000000 R15: 0000000
View attachment "raw.log.txt" of type "text/plain" (6149 bytes)
View attachment "repro.syz.txt" of type "text/plain" (553 bytes)
View attachment "repro.c.txt" of type "text/plain" (995 bytes)
View attachment "config.txt" of type "text/plain" (136942 bytes)
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