All of lore.kernel.org
 help / color / mirror / Atom feed
From: syzbot <syzbot+3b165dac15094065651e@syzkaller.appspotmail.com>
To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com
Subject: possible deadlock in __dev_queue_xmit (3)
Date: Tue, 03 Dec 2019 01:55:07 -0800	[thread overview]
Message-ID: <000000000000ea90600598c9b089@google.com> (raw)

Hello,

syzbot found the following crash on:

HEAD commit:    419593da Add linux-next specific files for 20191129
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14709712e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2f4b95d6f8310863
dashboard link: https://syzkaller.appspot.com/bug?extid=3b165dac15094065651e
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3b165dac15094065651e@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
5.4.0-next-20191129-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/2879 is trying to acquire lock:
ffff88809435b218 (&dev->qdisc_tx_busylock_key#71){+...}, at: spin_lock  
include/linux/spinlock.h:338 [inline]
ffff88809435b218 (&dev->qdisc_tx_busylock_key#71){+...}, at: __dev_xmit_skb  
net/core/dev.c:3644 [inline]
ffff88809435b218 (&dev->qdisc_tx_busylock_key#71){+...}, at:  
__dev_queue_xmit+0x2dce/0x35c0 net/core/dev.c:3982

but task is already holding lock:
ffff8880a9b9cc98 (&dev->qdisc_xmit_lock_key#312){+.-.}, at: spin_lock  
include/linux/spinlock.h:338 [inline]
ffff8880a9b9cc98 (&dev->qdisc_xmit_lock_key#312){+.-.}, at: __netif_tx_lock  
include/linux/netdevice.h:3929 [inline]
ffff8880a9b9cc98 (&dev->qdisc_xmit_lock_key#312){+.-.}, at:  
sch_direct_xmit+0x2e0/0xd30 net/sched/sch_generic.c:311

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&dev->qdisc_xmit_lock_key#312){+.-.}:
        __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
        _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
        spin_lock include/linux/spinlock.h:338 [inline]
        __netif_tx_lock include/linux/netdevice.h:3929 [inline]
        sch_direct_xmit+0x2e0/0xd30 net/sched/sch_generic.c:311
        __dev_xmit_skb net/core/dev.c:3621 [inline]
        __dev_queue_xmit+0x270a/0x35c0 net/core/dev.c:3982
        dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
        neigh_resolve_output net/core/neighbour.c:1490 [inline]
        neigh_resolve_output+0x5c4/0x990 net/core/neighbour.c:1470
        neigh_output include/net/neighbour.h:511 [inline]
        ip6_finish_output2+0x109a/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]
        NF_HOOK include/linux/netfilter.h:301 [inline]
        mld_sendpack+0x9c2/0xed0 net/ipv6/mcast.c:1682
        mld_send_cr net/ipv6/mcast.c:1978 [inline]
        mld_ifc_timer_expire+0x454/0x950 net/ipv6/mcast.c:2477
        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
        arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
        slab_alloc mm/slab.c:3313 [inline]
        __do_kmalloc mm/slab.c:3654 [inline]
        __kmalloc+0x2b8/0x770 mm/slab.c:3665
        kmalloc include/linux/slab.h:561 [inline]
        tomoyo_realpath_from_path+0xc5/0x660 security/tomoyo/realpath.c:252
        tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
        tomoyo_path_number_perm+0x1dd/0x520 security/tomoyo/file.c:723
        tomoyo_file_ioctl+0x23/0x30 security/tomoyo/tomoyo.c:341
        security_file_ioctl+0x77/0xc0 security/security.c:1409
        ksys_ioctl+0x57/0xd0 fs/ioctl.c:747
        __do_sys_ioctl fs/ioctl.c:756 [inline]
        __se_sys_ioctl fs/ioctl.c:754 [inline]
        __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
        do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
        entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&dev->qdisc_tx_busylock_key#71){+...}:
        check_prev_add kernel/locking/lockdep.c:2476 [inline]
        check_prevs_add kernel/locking/lockdep.c:2581 [inline]
        validate_chain kernel/locking/lockdep.c:2971 [inline]
        __lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955
        lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485
        __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
        _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
        spin_lock include/linux/spinlock.h:338 [inline]
        __dev_xmit_skb net/core/dev.c:3644 [inline]
        __dev_queue_xmit+0x2dce/0x35c0 net/core/dev.c:3982
        dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
        neigh_resolve_output net/core/neighbour.c:1490 [inline]
        neigh_resolve_output+0x5c4/0x990 net/core/neighbour.c:1470
        neigh_output include/net/neighbour.h:511 [inline]
        ip6_finish_output2+0x109a/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_ns+0x3a9/0x850 net/ipv6/ndisc.c:647
        ndisc_solicit+0x2ed/0x470 net/ipv6/ndisc.c:739
        neigh_probe+0xd0/0x120 net/core/neighbour.c:1012
        __neigh_event_send+0x3e3/0x17c0 net/core/neighbour.c:1172
        neigh_event_send include/net/neighbour.h:445 [inline]
        neigh_resolve_output+0x5ee/0x990 net/core/neighbour.c:1474
        neigh_output include/net/neighbour.h:511 [inline]
        ip6_finish_output2+0x109a/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]
        ip6_local_out+0xbb/0x1b0 net/ipv6/output_core.c:179
        ip6_send_skb+0xbb/0x350 net/ipv6/ip6_output.c:1795
        ip6_push_pending_frames+0xc8/0xf0 net/ipv6/ip6_output.c:1815
        icmpv6_push_pending_frames+0x34b/0x540 net/ipv6/icmp.c:285
        icmp6_send+0x1a7f/0x1f90 net/ipv6/icmp.c:598
        icmpv6_send+0xec/0x220 net/ipv6/ip6_icmp.c:43
        ip6_link_failure+0x2b/0x530 net/ipv6/route.c:2641
        dst_link_failure include/net/dst.h:419 [inline]
        ip_tunnel_xmit+0x1738/0x2d0c net/ipv4/ip_tunnel.c:824
        __gre_xmit+0x5e9/0x9a0 net/ipv4/ip_gre.c:448
        erspan_xmit+0x912/0x28f0 net/ipv4/ip_gre.c:683
        __netdev_start_xmit include/linux/netdevice.h:4442 [inline]
        netdev_start_xmit include/linux/netdevice.h:4456 [inline]
        xmit_one net/core/dev.c:3420 [inline]
        dev_hard_start_xmit+0x1a3/0x9b0 net/core/dev.c:3436
        sch_direct_xmit+0x372/0xd30 net/sched/sch_generic.c:313
        __dev_xmit_skb net/core/dev.c:3660 [inline]
        __dev_queue_xmit+0x1cc9/0x35c0 net/core/dev.c:3982
        dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
        neigh_resolve_output net/core/neighbour.c:1490 [inline]
        neigh_resolve_output+0x5c4/0x990 net/core/neighbour.c:1470
        neigh_output include/net/neighbour.h:511 [inline]
        ip6_finish_output2+0x109a/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]
        rawv6_send_hdrinc net/ipv6/raw.c:687 [inline]
        rawv6_sendmsg+0x203b/0x3860 net/ipv6/raw.c:944
        inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807
        sock_sendmsg_nosec net/socket.c:639 [inline]
        sock_sendmsg+0xd7/0x130 net/socket.c:659
        sock_write_iter+0x27c/0x3e0 net/socket.c:991
        call_write_iter include/linux/fs.h:1902 [inline]
        aio_write+0x2f2/0x540 fs/aio.c:1580
        __io_submit_one fs/aio.c:1812 [inline]
        io_submit_one+0xfbd/0x2ec0 fs/aio.c:1859
        __do_sys_io_submit fs/aio.c:1918 [inline]
        __se_sys_io_submit fs/aio.c:1888 [inline]
        __x64_sys_io_submit+0x1bd/0x540 fs/aio.c:1888
        do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
        entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&dev->qdisc_xmit_lock_key#312);
                                lock(&dev->qdisc_tx_busylock_key#71);
                                lock(&dev->qdisc_xmit_lock_key#312);
   lock(&dev->qdisc_tx_busylock_key#71);

  *** DEADLOCK ***

12 locks held by syz-executor.3/2879:
  #0: ffffffff891ad880 (rcu_read_lock){....}, at: l3mdev_l3_out  
include/net/l3mdev.h:179 [inline]
  #0: ffffffff891ad880 (rcu_read_lock){....}, at: l3mdev_ip6_out  
include/net/l3mdev.h:200 [inline]
  #0: ffffffff891ad880 (rcu_read_lock){....}, at: rawv6_send_hdrinc  
net/ipv6/raw.c:677 [inline]
  #0: ffffffff891ad880 (rcu_read_lock){....}, at:  
rawv6_sendmsg+0x1e28/0x3860 net/ipv6/raw.c:944
  #1: ffffffff891ad840 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect  
include/net/lwtunnel.h:92 [inline]
  #1: ffffffff891ad840 (rcu_read_lock_bh){....}, at:  
ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102
  #2: ffffffff891ad840 (rcu_read_lock_bh){....}, at:  
__dev_queue_xmit+0x20a/0x35c0 net/core/dev.c:3948
  #3: ffff88809435b138 (&dev->qdisc_running_key#128){+...}, at:  
dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
  #4: ffff8880a9b9cc98 (&dev->qdisc_xmit_lock_key#312){+.-.}, at: spin_lock  
include/linux/spinlock.h:338 [inline]
  #4: ffff8880a9b9cc98 (&dev->qdisc_xmit_lock_key#312){+.-.}, at:  
__netif_tx_lock include/linux/netdevice.h:3929 [inline]
  #4: ffff8880a9b9cc98 (&dev->qdisc_xmit_lock_key#312){+.-.}, at:  
sch_direct_xmit+0x2e0/0xd30 net/sched/sch_generic.c:311
  #5: ffffffff891ad880 (rcu_read_lock){....}, at: icmpv6_send+0x0/0x220  
net/ipv6/ip6_icmp.c:31
  #6: ffff88806e2194e0 (k-slock-AF_INET6){+.-.}, at: spin_trylock  
include/linux/spinlock.h:348 [inline]
  #6: ffff88806e2194e0 (k-slock-AF_INET6){+.-.}, at: icmpv6_xmit_lock  
net/ipv6/icmp.c:117 [inline]
  #6: ffff88806e2194e0 (k-slock-AF_INET6){+.-.}, at: icmp6_send+0xde8/0x1f90  
net/ipv6/icmp.c:519
  #7: ffffffff891ad880 (rcu_read_lock){....}, at: icmp6_send+0x13cd/0x1f90  
net/ipv6/icmp.c:579
  #8: ffffffff891ad840 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect  
include/net/lwtunnel.h:92 [inline]
  #8: ffffffff891ad840 (rcu_read_lock_bh){....}, at:  
ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102
  #9: ffffffff891ad880 (rcu_read_lock){....}, at: ip6_nd_hdr  
net/ipv6/ndisc.c:463 [inline]
  #9: ffffffff891ad880 (rcu_read_lock){....}, at:  
ndisc_send_skb+0x7fe/0x1490 net/ipv6/ndisc.c:499
  #10: ffffffff891ad840 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect  
include/net/lwtunnel.h:92 [inline]
  #10: ffffffff891ad840 (rcu_read_lock_bh){....}, at:  
ip6_finish_output2+0x214/0x25c0 net/ipv6/ip6_output.c:102
  #11: ffffffff891ad840 (rcu_read_lock_bh){....}, at:  
__dev_queue_xmit+0x20a/0x35c0 net/core/dev.c:3948

stack backtrace:
CPU: 0 PID: 2879 Comm: syz-executor.3 Not tainted  
5.4.0-next-20191129-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
  print_circular_bug.isra.0.cold+0x163/0x172 kernel/locking/lockdep.c:1685
  check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1809
  check_prev_add kernel/locking/lockdep.c:2476 [inline]
  check_prevs_add kernel/locking/lockdep.c:2581 [inline]
  validate_chain kernel/locking/lockdep.c:2971 [inline]
  __lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955
  lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151
  spin_lock include/linux/spinlock.h:338 [inline]
  __dev_xmit_skb net/core/dev.c:3644 [inline]
  __dev_queue_xmit+0x2dce/0x35c0 net/core/dev.c:3982
  dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
  neigh_resolve_output net/core/neighbour.c:1490 [inline]
  neigh_resolve_output+0x5c4/0x990 net/core/neighbour.c:1470
  neigh_output include/net/neighbour.h:511 [inline]
  ip6_finish_output2+0x109a/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_ns+0x3a9/0x850 net/ipv6/ndisc.c:647
  ndisc_solicit+0x2ed/0x470 net/ipv6/ndisc.c:739
  neigh_probe+0xd0/0x120 net/core/neighbour.c:1012
  __neigh_event_send+0x3e3/0x17c0 net/core/neighbour.c:1172
  neigh_event_send include/net/neighbour.h:445 [inline]
  neigh_resolve_output+0x5ee/0x990 net/core/neighbour.c:1474
  neigh_output include/net/neighbour.h:511 [inline]
  ip6_finish_output2+0x109a/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]
  ip6_local_out+0xbb/0x1b0 net/ipv6/output_core.c:179
  ip6_send_skb+0xbb/0x350 net/ipv6/ip6_output.c:1795
  ip6_push_pending_frames+0xc8/0xf0 net/ipv6/ip6_output.c:1815
  icmpv6_push_pending_frames+0x34b/0x540 net/ipv6/icmp.c:285
  icmp6_send+0x1a7f/0x1f90 net/ipv6/icmp.c:598
  icmpv6_send+0xec/0x220 net/ipv6/ip6_icmp.c:43
  ip6_link_failure+0x2b/0x530 net/ipv6/route.c:2641
  dst_link_failure include/net/dst.h:419 [inline]
  ip_tunnel_xmit+0x1738/0x2d0c net/ipv4/ip_tunnel.c:824
  __gre_xmit+0x5e9/0x9a0 net/ipv4/ip_gre.c:448
  erspan_xmit+0x912/0x28f0 net/ipv4/ip_gre.c:683
  __netdev_start_xmit include/linux/netdevice.h:4442 [inline]
  netdev_start_xmit include/linux/netdevice.h:4456 [inline]
  xmit_one net/core/dev.c:3420 [inline]
  dev_hard_start_xmit+0x1a3/0x9b0 net/core/dev.c:3436
  sch_direct_xmit+0x372/0xd30 net/sched/sch_generic.c:313
  __dev_xmit_skb net/core/dev.c:3660 [inline]
  __dev_queue_xmit+0x1cc9/0x35c0 net/core/dev.c:3982
  dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
  neigh_resolve_output net/core/neighbour.c:1490 [inline]
  neigh_resolve_output+0x5c4/0x990 net/core/neighbour.c:1470
  neigh_output include/net/neighbour.h:511 [inline]
  ip6_finish_output2+0x109a/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]
  rawv6_send_hdrinc net/ipv6/raw.c:687 [inline]
  rawv6_sendmsg+0x203b/0x3860 net/ipv6/raw.c:944
  inet_sendmsg+0x9e/0xe0 net/ipv4/af_inet.c:807
  sock_sendmsg_nosec net/socket.c:639 [inline]
  sock_sendmsg+0xd7/0x130 net/socket.c:659
  sock_write_iter+0x27c/0x3e0 net/socket.c:991
  call_write_iter include/linux/fs.h:1902 [inline]
  aio_write+0x2f2/0x540 fs/aio.c:1580
  __io_submit_one fs/aio.c:1812 [inline]
  io_submit_one+0xfbd/0x2ec0 fs/aio.c:1859
  __do_sys_io_submit fs/aio.c:1918 [inline]
  __se_sys_io_submit fs/aio.c:1888 [inline]
  __x64_sys_io_submit+0x1bd/0x540 fs/aio.c:1888
  do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a679
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbd60c44c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020356ff0 RSI: 0000000000000001 RDI: 00007fbd60c24000
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd60c456d4
R13: 00000000004c1d83 R14: 00000000004d6060 R15: 00000000ffffffff
syz-executor.3 (2879) used greatest stack depth: 20000 bytes left


---
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.

             reply	other threads:[~2019-12-03  9:55 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03  9:55 syzbot [this message]
2020-07-31  7:12 ` possible deadlock in __dev_queue_xmit (3) syzbot
2020-08-02  7:43 ` syzbot

Reply instructions:

You may reply publicly 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=000000000000ea90600598c9b089@google.com \
    --to=syzbot+3b165dac15094065651e@syzkaller.appspotmail.com \
    --cc=davem@davemloft.net \
    --cc=jhs@mojatatu.com \
    --cc=jiri@resnulli.us \
    --cc=linux-kernel@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=syzkaller-bugs@googlegroups.com \
    --cc=xiyou.wangcong@gmail.com \
    /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
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.