Linux-WPAN Archive on lore.kernel.org
 help / color / Atom feed
From: syzbot <syzbot+ad4ea1dd5d26131a58a6@syzkaller.appspotmail.com>
To: a@unstable.cc, alex.aring@gmail.com, allison@lohutok.net,
	andrew@lunn.ch, andy@greyhouse.net, ap420073@gmail.com,
	ast@domdv.de, b.a.t.m.a.n@lists.open-mesh.org,
	bridge@lists.linux-foundation.org, cleech@redhat.com,
	daniel@iogearbox.net, davem@davemloft.net,
	dsa@cumulusnetworks.com, f.fainelli@gmail.com, fw@strlen.de,
	gregkh@linuxfoundation.org, gustavo@embeddedor.com,
	haiyangz@microsoft.com, info@metux.net, j.vosburgh@gmail.com,
	j@w1.fi, jakub.kicinski@netronome.com, jhs@mojatatu.com,
	jiri@resnulli.us, johan.hedberg@gmail.com,
	johannes.berg@intel.com, john.hurley@netronome.com,
	jwi@linux.ibm.com, kstewart@linuxfoundation.org,
	kuznet@ms2.inr.ac.ru, kvalo@codeaurora.org, kys@microsoft.com,
	linmiaohe@huawei.com, linux-bluetooth@vger.kernel.org,
	linux-hams@vger.kernel.org, linux-hyperv@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-ppp@vger.kernel.org,
	linux-wireless@vger.kernel.org, linux-wpan@vger.kernel.org,
	liuhangbin@gmail.com, marcel@holtmann.org,
	mareklindner@neomailbox.ch, mkubecek@suse.cz,
	mmanning@vyatta.att-mail.com, netdev@vger.kernel.org,
	nikolay@cumulusnetworks.com, oss-drivers@netronome.com,
	pabeni@redhat.com, paulus@samba.org
Subject: WARNING: bad unlock balance in __dev_queue_xmit
Date: Sat, 11 Jan 2020 13:34:08 -0800
Message-ID: <000000000000a06985059be4002e@google.com> (raw)

Hello,

syzbot found the following crash on:

HEAD commit:    ae608821 Merge tag 'trace-v5.5-rc5' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12abc515e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=18698c0c240ba616
dashboard link: https://syzkaller.appspot.com/bug?extid=ad4ea1dd5d26131a58a6
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=141051b9e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=125e5876e00000

The bug was bisected to:

commit ab92d68fc22f9afab480153bd82a20f6e2533769
Author: Taehee Yoo <ap420073@gmail.com>
Date:   Mon Oct 21 18:47:51 2019 +0000

     net: core: add generic lockdep keys

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=107f969ee00000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=127f969ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=147f969ee00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ad4ea1dd5d26131a58a6@syzkaller.appspotmail.com
Fixes: ab92d68fc22f ("net: core: add generic lockdep keys")

=====================================
WARNING: bad unlock balance detected!
5.5.0-rc5-syzkaller #0 Not tainted
-------------------------------------
swapper/0/0 is trying to release lock (&dev->qdisc_xmit_lock_key) at:
[<ffffffff8625890d>] spin_unlock include/linux/spinlock.h:378 [inline]
[<ffffffff8625890d>] __netif_tx_unlock include/linux/netdevice.h:3966  
[inline]
[<ffffffff8625890d>] __dev_queue_xmit+0x2bbd/0x35c0 net/core/dev.c:4016
but there are no more locks to release!

other info that might help us debug this:
4 locks held by swapper/0/0:
  #0: ffffc90000007d50 ((&ndev->rs_timer)){+.-.}, at: lockdep_copy_map  
include/linux/lockdep.h:172 [inline]
  #0: ffffc90000007d50 ((&ndev->rs_timer)){+.-.}, at:  
call_timer_fn+0xe0/0x780 kernel/time/timer.c:1394
  #1: ffffffff899a5340 (rcu_read_lock){....}, at: ip6_nd_hdr  
net/ipv6/ndisc.c:463 [inline]
  #1: ffffffff899a5340 (rcu_read_lock){....}, at:  
ndisc_send_skb+0x7fe/0x1490 net/ipv6/ndisc.c:499
  #2: ffffffff899a5300 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect  
include/net/lwtunnel.h:92 [inline]
  #2: ffffffff899a5300 (rcu_read_lock_bh){....}, at:  
ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102
  #3: ffffffff899a5300 (rcu_read_lock_bh){....}, at:  
__dev_queue_xmit+0x20a/0x35c0 net/core/dev.c:3948

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <IRQ>
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x197/0x210 lib/dump_stack.c:118
  print_unlock_imbalance_bug kernel/locking/lockdep.c:4008 [inline]
  print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3984
  __lock_release kernel/locking/lockdep.c:4242 [inline]
  lock_release+0x5f2/0x960 kernel/locking/lockdep.c:4503
  __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline]
  _raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:183
  spin_unlock include/linux/spinlock.h:378 [inline]
  __netif_tx_unlock include/linux/netdevice.h:3966 [inline]
  __dev_queue_xmit+0x2bbd/0x35c0 net/core/dev.c:4016
  dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
  neigh_hh_output include/net/neighbour.h:499 [inline]
  neigh_output include/net/neighbour.h:508 [inline]
  ip6_finish_output2+0xfbe/0x25c0 net/ipv6/ip6_output.c:116
  __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142
  ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152
  NF_HOOK_COND include/linux/netfilter.h:296 [inline]
  ip6_output+0x25e/0x880 net/ipv6/ip6_output.c:175
  dst_output include/net/dst.h:436 [inline]
  NF_HOOK include/linux/netfilter.h:307 [inline]
  ndisc_send_skb+0xf1f/0x1490 net/ipv6/ndisc.c:505
  ndisc_send_rs+0x134/0x720 net/ipv6/ndisc.c:699
  addrconf_rs_timer+0x30f/0x6e0 net/ipv6/addrconf.c:3879
  call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
  expire_timers kernel/time/timer.c:1449 [inline]
  __run_timers kernel/time/timer.c:1773 [inline]
  __run_timers kernel/time/timer.c:1740 [inline]
  run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
  __do_softirq+0x262/0x98c kernel/softirq.c:292
  invoke_softirq kernel/softirq.c:373 [inline]
  irq_exit+0x19b/0x1e0 kernel/softirq.c:413
  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
  smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
  </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 38 be db f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d c4 54 51  
00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 54 51 00 fb f4 <c3> cc 55 48 89  
e5 41 57 41 56 41 55 41 54 53 e8 5e 92 8b f9 e8 c9
RSP: 0018:ffffffff89807ce8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff132669e RBX: ffffffff8987a140 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff8987a9d4
RBP: ffffffff89807d18 R08: ffffffff8987a140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff8a7b8600 R14: 0000000000000000 R15: 0000000000000000
  arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:690
  default_idle_call+0x84/0xb0 kernel/sched/idle.c:94
  cpuidle_idle_call kernel/sched/idle.c:154 [inline]
  do_idle+0x3c8/0x6e0 kernel/sched/idle.c:269
  cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:361
  rest_init+0x23b/0x371 init/main.c:451
  arch_call_rest_init+0xe/0x1b
  start_kernel+0x904/0x943 init/main.c:784
  x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:490
  x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:471
  secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242
kobject: 'brport' (0000000015306f5c): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (0000000015306f5c): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (00000000f618ced7): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (00000000f618ced7): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (0000000090c32451): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (0000000090c32451): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (000000009b39b612): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (000000009b39b612): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (00000000fa23c3a6): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (00000000fa23c3a6): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (0000000059be53cf): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (0000000059be53cf): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (00000000afda9faa): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (00000000afda9faa): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (000000001b8d397b): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (000000001b8d397b): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (00000000c95708c8): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (00000000c95708c8): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (0000000021fa4c47): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (0000000021fa4c47): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (00000000e55a6ea3): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (00000000e55a6ea3): calling ktype release
kobject: 'brport': free name
kobject: 'brport' (000000005f707c44): kobject_cleanup, parent  
00000000835b0c7d
kobject: 'brport' (000000005f707c44): calling ktype release
kobject: 'brport': free name


---
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@googlegroups.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

             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-11 21:34 syzbot [this message]
2020-01-11 23:38 ` Cong Wang
2020-01-11 23:38   ` syzbot

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=000000000000a06985059be4002e@google.com \
    --to=syzbot+ad4ea1dd5d26131a58a6@syzkaller.appspotmail.com \
    --cc=a@unstable.cc \
    --cc=alex.aring@gmail.com \
    --cc=allison@lohutok.net \
    --cc=andrew@lunn.ch \
    --cc=andy@greyhouse.net \
    --cc=ap420073@gmail.com \
    --cc=ast@domdv.de \
    --cc=b.a.t.m.a.n@lists.open-mesh.org \
    --cc=bridge@lists.linux-foundation.org \
    --cc=cleech@redhat.com \
    --cc=daniel@iogearbox.net \
    --cc=davem@davemloft.net \
    --cc=dsa@cumulusnetworks.com \
    --cc=f.fainelli@gmail.com \
    --cc=fw@strlen.de \
    --cc=gregkh@linuxfoundation.org \
    --cc=gustavo@embeddedor.com \
    --cc=haiyangz@microsoft.com \
    --cc=info@metux.net \
    --cc=j.vosburgh@gmail.com \
    --cc=j@w1.fi \
    --cc=jakub.kicinski@netronome.com \
    --cc=jhs@mojatatu.com \
    --cc=jiri@resnulli.us \
    --cc=johan.hedberg@gmail.com \
    --cc=johannes.berg@intel.com \
    --cc=john.hurley@netronome.com \
    --cc=jwi@linux.ibm.com \
    --cc=kstewart@linuxfoundation.org \
    --cc=kuznet@ms2.inr.ac.ru \
    --cc=kvalo@codeaurora.org \
    --cc=kys@microsoft.com \
    --cc=linmiaohe@huawei.com \
    --cc=linux-bluetooth@vger.kernel.org \
    --cc=linux-hams@vger.kernel.org \
    --cc=linux-hyperv@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-ppp@vger.kernel.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=linux-wpan@vger.kernel.org \
    --cc=liuhangbin@gmail.com \
    --cc=marcel@holtmann.org \
    --cc=mareklindner@neomailbox.ch \
    --cc=mkubecek@suse.cz \
    --cc=mmanning@vyatta.att-mail.com \
    --cc=netdev@vger.kernel.org \
    --cc=nikolay@cumulusnetworks.com \
    --cc=oss-drivers@netronome.com \
    --cc=pabeni@redhat.com \
    --cc=paulus@samba.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-WPAN Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-wpan/0 linux-wpan/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-wpan linux-wpan/ https://lore.kernel.org/linux-wpan \
		linux-wpan@vger.kernel.org
	public-inbox-index linux-wpan

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-wpan


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git