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INFO: rcu detected stall in commit_echoes

Status: closed as dup on 2018/03/28 07:12
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+a0366f667e2cac7c0bbf@syzkaller.appspotmail.com
First crash: 2775d, last: 2678d
▶ ▼ Duplicate of
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported
INFO: rcu detected stall in __process_echoes serial 1 C 326 2678d 2774d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
INFO: rcu detected stall in commit_echoes 1 (2) 2018/03/28 07:11

Sample crash report:
INFO: rcu_sched self-detected stall on CPU
	1-....: (124998 ticks this GP) idle=7ba/1/4611686018427387906 softirq=9341/9341 fqs=31242 
	 (t=125000 jiffies g=4322 c=4321 q=3)
NMI backtrace for cpu 1
CPU: 1 PID: 4465 Comm: kworker/u4:30 Not tainted 4.16.0+ #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline]
 rcu_dump_cpu_stacks+0x186/0x1de kernel/rcu/tree.c:1375
 print_cpu_stall kernel/rcu/tree.c:1524 [inline]
 check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1592
 __rcu_pending kernel/rcu/tree.c:3361 [inline]
 rcu_pending kernel/rcu/tree.c:3423 [inline]
 rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763
 update_process_times+0x30/0x60 kernel/time/timer.c:1636
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194
 __run_hrtimer kernel/time/hrtimer.c:1349 [inline]
 __hrtimer_run_queues+0x39c/0xec0 kernel/time/hrtimer.c:1411
 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857
 </IRQ>
RIP: 0010:echo_buf drivers/tty/n_tty.c:144 [inline]
RIP: 0010:__process_echoes+0x62c/0x770 drivers/tty/n_tty.c:733
RSP: 0018:ffff8801b6b9f078 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff12
RAX: 0000000000000000 RBX: ffffc900028b4000 RCX: ffffffff8352d4c2
RDX: 0000000000000002 RSI: 1ffff10038575a04 RDI: ffffc900028b5712
RBP: ffff8801b6b9f0e0 R08: 1ffff10036d73db5 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000006734944b1
R13: dffffc0000000000 R14: 00000000000004b2 R15: 0000000000001d05
 commit_echoes+0x147/0x1b0 drivers/tty/n_tty.c:764
 n_tty_receive_char_fast drivers/tty/n_tty.c:1416 [inline]
 n_tty_receive_buf_fast drivers/tty/n_tty.c:1576 [inline]
 __receive_buf drivers/tty/n_tty.c:1611 [inline]
 n_tty_receive_buf_common+0x1156/0x2520 drivers/tty/n_tty.c:1709
 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1744
 tty_ldisc_receive_buf+0xa7/0x180 drivers/tty/tty_buffer.c:456
 tty_port_default_receive_buf+0x106/0x160 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x3c4/0x590 drivers/tty/tty_buffer.c:524
 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406

Crashes (237):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/02 07:41 upstream 0adb32858b0b dc889257 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/01 21:15 upstream 883c9ab9eb59 dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/07/01 19:48 upstream 883c9ab9eb59 dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/30 16:52 upstream 1904148a361a dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/29 21:50 upstream 2cd3ae212973 dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/29 17:23 upstream 2cd3ae212973 dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/29 11:34 upstream 90368a37fbbe dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/29 03:17 upstream 90368a37fbbe dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/28 13:41 upstream f57494321cbf dba0b50e .config console log report ci-upstream-kasan-gce-root
2018/06/26 22:11 upstream 813835028e9a b0294c53 .config console log report ci-upstream-kasan-gce-root
2018/06/26 06:58 upstream 6f0d349d922b 2064fc5c .config console log report ci-upstream-kasan-gce-root
2018/06/26 00:56 upstream 6f0d349d922b 2064fc5c .config console log report ci-upstream-kasan-gce-root
2018/06/24 13:22 upstream 77072ca59fdd 2064fc5c .config console log report ci-upstream-kasan-gce-root
2018/06/24 02:10 upstream 5e2204832b20 2064fc5c .config console log report ci-upstream-kasan-gce-root
2018/06/22 12:55 upstream 894b8c000ae6 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/22 11:23 upstream 894b8c000ae6 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/22 02:41 upstream 27db64f65f1b 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/22 00:39 upstream 27db64f65f1b 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/21 17:30 upstream 1abd8a8f39cd 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/21 03:35 upstream 1abd8a8f39cd 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/20 16:19 upstream 81e97f01371f 095ef806 .config console log report ci-upstream-kasan-gce-root
2018/06/19 19:16 upstream ba4dbdedd3ed 732e4256 .config console log report ci-upstream-kasan-gce-root
2018/06/19 17:05 upstream ba4dbdedd3ed 732e4256 .config console log report ci-upstream-kasan-gce-root
2018/06/19 09:59 upstream ba4dbdedd3ed 45c54f75 .config console log report ci-upstream-kasan-gce-root
2018/06/18 21:13 upstream 9ffc59d57228 45c54f75 .config console log report ci-upstream-kasan-gce-root
2018/06/18 06:45 upstream 9ffc59d57228 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/18 03:49 upstream ce397d215ccd 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/18 02:33 upstream ce397d215ccd 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/18 01:32 upstream ce397d215ccd 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/17 18:03 upstream ce397d215ccd 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/17 07:47 upstream ce397d215ccd 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/16 12:54 upstream 9215310cf13b 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/16 11:34 upstream 9215310cf13b 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/16 11:01 upstream 9215310cf13b 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/16 08:34 upstream 9215310cf13b 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/15 23:06 upstream 4c5e8fc62d6a 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/15 19:05 upstream 4c5e8fc62d6a 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/15 10:26 upstream b5d903c2d656 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/15 08:23 upstream b5d903c2d656 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/14 08:26 upstream be779f03d563 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/14 04:46 upstream be779f03d563 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/13 22:07 upstream be779f03d563 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/13 20:20 upstream be779f03d563 27c5f59f .config console log report ci-upstream-kasan-gce-root
2018/06/12 19:13 upstream 0725d4e1b8b0 6dcbc435 .config console log report ci-upstream-kasan-gce-root
2018/03/27 05:38 upstream 3eb2ce825ea1 0ca7878b .config console log report ci-upstream-kasan-gce-root
* Struck through repros no longer work on HEAD.