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INFO: rcu detected stall in x25_connect

Status: auto-closed as invalid on 2019/08/20 16:40
Subsystems: x25
[Documentation on labels]
Reported-by: syzbot+564c57b4bf1df3ce1c94@syzkaller.appspotmail.com
First crash: 1955d, last: 1898d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
Reminder: 5 open syzbot bugs in "net/x25" subsystem 1 (1) 2019/07/24 02:28
INFO: rcu detected stall in x25_connect 0 (1) 2018/12/31 08:03

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=3da/1/0x4000000000000002 softirq=122148/122148 fqs=0 
rcu: 	 (t=10501 jiffies g=164977 q=171)
rcu: rcu_preempt kthread starved for 10502 jiffies! g164977 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I28928    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2844 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3485
 schedule+0x92/0x180 kernel/sched/core.c:3529
 schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1803
 rcu_gp_fqs_loop kernel/rcu/tree.c:1948 [inline]
 rcu_gp_kthread+0x956/0x17a0 kernel/rcu/tree.c:2105
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 29443 Comm: syz-executor.4 Not tainted 5.0.0-rc5+ #72
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211
 print_cpu_stall kernel/rcu/tree.c:1348 [inline]
 check_cpu_stall kernel/rcu/tree.c:1422 [inline]
 rcu_pending kernel/rcu/tree.c:3018 [inline]
 rcu_check_callbacks.cold+0x500/0xa4a kernel/rcu/tree.c:2521
 update_process_times+0x32/0x80 kernel/time/timer.c:1635
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:69 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x20/0x50 kernel/kcov.c:101
Code: 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 98 12 92 7e 81 e2 00 01 1f 00 75 2b <8b> 90 d8 12 00 00 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12
RSP: 0018:ffff888062357c48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a4bf2200 RBX: dffffc0000000000 RCX: ffffffff8631bd46
RDX: 0000000000000000 RSI: ffffffff8631bce8 RDI: 0000000000000004
RBP: ffff888062357c48 R08: ffff8880a4bf2200 R09: fffffbfff1282519
R10: fffffbfff1282518 R11: ffffffff894128c3 R12: ffff8880902db540
R13: 0000000000000001 R14: ffff8880a07e2e00 R15: 000000000000014a
 __x25_find_socket+0x48/0x120 net/x25/af_x25.c:327
 x25_new_lci net/x25/af_x25.c:357 [inline]
 x25_connect+0x374/0xdf0 net/x25/af_x25.c:786
 __sys_connect+0x266/0x330 net/socket.c:1662
 __do_sys_connect net/socket.c:1673 [inline]
 __se_sys_connect net/socket.c:1670 [inline]
 __x64_sys_connect+0x73/0xb0 net/socket.c:1670
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e39
Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f92dc475c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39
RDX: 0000000000000012 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f92dc4766d4
R13: 00000000004be378 R14: 00000000004ceae0 R15: 00000000ffffffff

Crashes (30):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/02/11 03:20 net-old 31b58ad0c327 b4f792e4 .config console log report ci-upstream-net-this-kasan-gce
2019/02/09 11:31 net-old b5bfc21af5cb fa6c7b70 .config console log report ci-upstream-net-this-kasan-gce
2019/02/08 22:32 net-old 39841cc1cbb6 fa6c7b70 .config console log report ci-upstream-net-this-kasan-gce
2019/02/04 22:51 net-old cfe4bd7a257f d672172c .config console log report ci-upstream-net-this-kasan-gce
2019/01/14 16:35 net-old 2f960bd05640 95485883 .config console log report ci-upstream-net-this-kasan-gce
2019/01/14 05:46 net-old 2f960bd05640 c3f3344c .config console log report ci-upstream-net-this-kasan-gce
2019/01/11 19:05 net-old b19bce0335e2 c3f3344c .config console log report ci-upstream-net-this-kasan-gce
2019/01/07 22:00 net-old 0aaa81377c5a 69d69aa9 .config console log report ci-upstream-net-this-kasan-gce
2018/12/26 23:33 net-old 38355a5f9a22 e747ec98 .config console log report ci-upstream-net-this-kasan-gce
2019/02/21 16:39 net-next-old 64ccfd2dbbdf 3133098b .config console log report ci-upstream-net-kasan-gce
2019/02/13 06:00 net-next-old bd3606c29fcc 1eedba36 .config console log report ci-upstream-net-kasan-gce
2019/02/12 15:31 net-next-old 6663cf821c13 6ecc6d0f .config console log report ci-upstream-net-kasan-gce
2019/02/12 08:01 net-next-old b904aada8033 65a0d619 .config console log report ci-upstream-net-kasan-gce
2019/02/09 21:24 net-next-old 3b5e74e0afe3 d75f7686 .config console log report ci-upstream-net-kasan-gce
2019/02/09 11:49 net-next-old 3e3e0cdfca48 fa6c7b70 .config console log report ci-upstream-net-kasan-gce
2019/02/05 19:53 net-next-old 5468e82f7034 d672172c .config console log report ci-upstream-net-kasan-gce
2019/01/30 22:26 net-next-old 08c25fe83a0c aa432daf .config console log report ci-upstream-net-kasan-gce
2019/01/30 13:28 net-next-old eaf2a47f40f0 aa432daf .config console log report ci-upstream-net-kasan-gce
2019/01/26 16:18 net-next-old f859a4484703 c73f090a .config console log report ci-upstream-net-kasan-gce
2019/01/24 03:36 net-next-old 33a0efa4baec 56558f63 .config console log report ci-upstream-net-kasan-gce
2019/01/23 04:29 net-next-old 1435d9970378 b1ff06b2 .config console log report ci-upstream-net-kasan-gce
2019/01/22 04:27 net-next-old fa7f3a8d56b3 badbbeee .config console log report ci-upstream-net-kasan-gce
2019/01/20 00:37 net-next-old 133bbb18ab1a 353f32ea .config console log report ci-upstream-net-kasan-gce
2019/01/19 18:11 net-next-old f04d402f2f00 8aa587b0 .config console log report ci-upstream-net-kasan-gce
2019/01/19 17:47 net-next-old f04d402f2f00 8aa587b0 .config console log report ci-upstream-net-kasan-gce
2019/01/18 22:07 net-next-old 435f3f267780 2103a236 .config console log report ci-upstream-net-kasan-gce
2019/01/17 05:47 net-next-old bdbe8cc1a30c c2faf9b2 .config console log report ci-upstream-net-kasan-gce
2019/01/15 21:34 net-next-old 7939f8beecf1 79cb1a7c .config console log report ci-upstream-net-kasan-gce
2019/01/15 02:03 net-next-old b71acb0e3721 ebacf5cb .config console log report ci-upstream-net-kasan-gce
2019/01/10 20:29 net-next-old b71acb0e3721 db9b6579 .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.