syzbot


INFO: task hung in packet_release

Status: auto-closed as invalid on 2019/05/08 04:16
Reported-by: syzbot+59fea288502f5f19cce0@syzkaller.appspotmail.com
First crash: 2117d, last: 2055d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in packet_release 1 1749d 1748d 0/1 auto-closed as invalid on 2020/01/09 04:52
android-49 INFO: task hung in packet_release 4 1825d 1898d 0/3 auto-closed as invalid on 2019/10/25 08:48
upstream INFO: task hung in packet_release net 159 1714d 2111d 0/27 closed as invalid on 2019/10/23 07:21

Sample crash report:
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
INFO: task syz-executor0:1217 blocked for more than 140 seconds.
      Not tainted 4.14.79+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29208  1217   1842 0x00000004
Call Trace:
 schedule+0x7f/0x1b0 kernel/sched/core.c:3490
 exp_funnel_lock kernel/rcu/tree_exp.h:295 [inline]
 _synchronize_rcu_expedited+0x696/0x850 kernel/rcu/tree_exp.h:596
 synchronize_net+0x2b/0x40 net/core/dev.c:8210
 packet_release+0x796/0xb60 net/packet/af_packet.c:3046
 __sock_release+0x1d5/0x250 net/socket.c:602
 sock_release net/socket.c:622 [inline]
 SYSC_socketpair net/socket.c:1459 [inline]
 SyS_socketpair+0x389/0x4d0 net/socket.c:1365
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007f75f0801c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569
RDX: 0000000000000300 RSI: 0000000000000003 RDI: 0000000000000011
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00007f75f08026d4
R13: 00000000004c4a89 R14: 00000000004d7f18 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff89602077>] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541
2 locks held by getty/1758:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff8a13c270>] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff8a1377ef>] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.79+ #1
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
 watchdog+0x574/0xa70 kernel/hung_task.c:252
 kthread+0x348/0x420 kernel/kthread.c:232
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8ac63ce2

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/11/09 04:15 android-4.14 6c95b90db52b e85d2a61 .config console log report ci-android-414-kasan-gce-root
2018/09/07 10:59 android-4.14 b859aa7d7a0c e30d3b52 .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.