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Date: Wed, 19 Feb 2020 09:34:11 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Hillf Danton <hdanton@...a.com>, jmaloy@...hat.com
Cc: syzbot <syzbot+1a68504d96cd17b33a05@...kaller.appspotmail.com>,
allison@...utok.net, David Miller <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
LKML <linux-kernel@...r.kernel.org>,
netdev <netdev@...r.kernel.org>,
syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
Thomas Gleixner <tglx@...utronix.de>,
tipc-discussion@...ts.sourceforge.net,
Ying Xue <ying.xue@...driver.com>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: BUG: using smp_processor_id() in preemptible [ADDR] code: syz-executor
On Wed, Feb 19, 2020 at 9:31 AM Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
> On Sun, Jun 30, 2019 at 7:19 AM Hillf Danton <hdanton@...a.com> wrote:
> >
> >
> > Hello,
> >
> > On Sat, 29 Jun 2019 08:47:06 -0700 (PDT)
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: ee7dd773 sis900: remove TxIDLE
> > > git tree: net-next
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=17ceb9a9a00000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=7ac9edef4d37e5fb
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=1a68504d96cd17b33a05
> > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119b2a13a00000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13127bada00000
> > >
> > > The bug was bisected to:
> >
> > Hm... I doubt it is e9c1a793210f ("tipc: add dst_cache support for udp media")
> > based on one of the lines dumped:
> >
> > > tipc_udp_xmit.isra.0+0xc4/0xb80 net/tipc/udp_media.c:164
> >
> >
> > And getting the local bottom half disabled looks like a teaspoon of
> > cough syrup.
> > ---
> >
> > --- a/net/tipc/udp_media.c
> > +++ b/net/tipc/udp_media.c
> > @@ -224,6 +224,8 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
> > struct udp_bearer *ub;
> > int err = 0;
> >
> > + local_bh_disable();
> > +
> > if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
> > err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
> > if (err)
> > @@ -237,9 +239,12 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
> > goto out;
> > }
> >
> > - if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
> > - return tipc_udp_xmit(net, skb, ub, src, dst,
> > + if (addr->broadcast != TIPC_REPLICAST_SUPPORT) {
> > + err = tipc_udp_xmit(net, skb, ub, src, dst,
> > &ub->rcast.dst_cache);
> > + local_bh_enable();
> > + return err;
> > + }
> >
> > /* Replicast, send an skb to each configured IP address */
> > list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
> > @@ -259,6 +264,7 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
> > err = 0;
> > out:
> > kfree_skb(skb);
> > + local_bh_enable();
> > return err;
> > }
> >
> > --
> >
> > > commit 52dfae5c85a4c1078e9f1d5e8947d4a25f73dd81
> > > Author: Jon Maloy <jon.maloy@...csson.com>
> > > Date: Thu Mar 22 19:42:52 2018 +0000
> > >
> > > tipc: obtain node identity from interface by default
>
> What is the fate of this fix?
> There is also another fix for this pending for half a year as far as I can tell.
>
> This is one of the top crashes and it prevents most other kernel
> testing from happening. All kernels just crash on this right away.
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
+jmaloy new email address
> > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=160ad903a00000
> > > final crash: https://syzkaller.appspot.com/x/report.txt?x=150ad903a00000
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=110ad903a00000
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: syzbot+1a68504d96cd17b33a05@...kaller.appspotmail.com
> > > Fixes: 52dfae5c85a4 ("tipc: obtain node identity from interface by default")
> > >
> > > Started in network mode
> > > Own node identity 7f000001, cluster identity 4711
> > > New replicast peer: 172.20.20.22
> > > check_preemption_disabled: 3 callbacks suppressed
> > > BUG: using smp_processor_id() in preemptible [00000000] code:
> > > syz-executor834/8612
> > > caller is dst_cache_get+0x3d/0xb0 net/core/dst_cache.c:68
> > > CPU: 0 PID: 8612 Comm: syz-executor834 Not tainted 5.2.0-rc6+ #48
> > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > > Google 01/01/2011
> > > Call Trace:
> > > __dump_stack lib/dump_stack.c:77 [inline]
> > > dump_stack+0x172/0x1f0 lib/dump_stack.c:113
> > > check_preemption_disabled lib/smp_processor_id.c:47 [inline]
> > > debug_smp_processor_id+0x251/0x280 lib/smp_processor_id.c:57
> > > dst_cache_get+0x3d/0xb0 net/core/dst_cache.c:68
> > > tipc_udp_xmit.isra.0+0xc4/0xb80 net/tipc/udp_media.c:164
> > > tipc_udp_send_msg+0x29a/0x4b0 net/tipc/udp_media.c:254
> > > tipc_bearer_xmit_skb+0x16c/0x360 net/tipc/bearer.c:503
> > > tipc_enable_bearer+0xabe/0xd20 net/tipc/bearer.c:328
> > > __tipc_nl_bearer_enable+0x2de/0x3a0 net/tipc/bearer.c:899
> > > tipc_nl_bearer_enable+0x23/0x40 net/tipc/bearer.c:907
> > > genl_family_rcv_msg+0x74b/0xf90 net/netlink/genetlink.c:629
> > > genl_rcv_msg+0xca/0x16c net/netlink/genetlink.c:654
> > > netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
> > > genl_rcv+0x29/0x40 net/netlink/genetlink.c:665
> > > netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
> > > netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328
> > > netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
> > > sock_sendmsg_nosec net/socket.c:646 [inline]
> > > sock_sendmsg+0xd7/0x130 net/socket.c:665
> > > ___sys_sendmsg+0x803/0x920 net/socket.c:2286
> > > __sys_sendmsg+0x105/0x1d0 net/socket.c:2324
> > > __do_sys_sendmsg net/socket.c:2333 [inline]
> > > __se_sys_sendmsg net/socket.c:2331 [inline]
> > > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2331
> > > do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
> > > entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > > RIP: 0033:0x444679
> > > Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7
> > > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
> > > ff 0f 83 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> > > RSP: 002b:00007fff0201a8b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> > > RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444679
> > > RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000003
> > > RBP: 00000000006cf018 R08: 0000000000000001 R09: 00000000004002e0
> > > R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000402320
> > > R13: 00000000004023b0 R14: 0000000000000000 R15: 0000000000
> > >
> > >
> > > ---
> > > This bug is generated by a bot. It may contain errors.
> > > See https://goo.gl/tpsmEJ for more information about syzbot.
> > > syzbot engineers can be reached at syzkaller@...glegroups.com.
> > >
> > > syzbot will keep track of this bug report. See:
> > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> > > syzbot can test patches for this bug, for details see:
> > > https://goo.gl/tpsmEJ#testing-patches
> > >
> >
> >
> > --
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