linux-kernel - Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

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Date:   Thu, 11 Jan 2018 13:20:10 -0500 (EST)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Vince Weaver <vincent.weaver@...ne.edu>
cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7

On Thu, 11 Jan 2018, Vince Weaver wrote:

> on the same core2 machine I got this which didn't crash the machine (but 
> the perf_fuzzer process is stuck)

also got this one:

Cannot open /sys/kernel/tracing/kprobe_events
[  408.159243] watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [perf_fuzzer:22326]
[  408.193102] CPU: 1 PID: 22326 Comm: perf_fuzzer Tainted: G      D          4.15.0-rc7+ #211
[  408.201507] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012
[  408.210436] RIP: 0010:smp_call_function_single+0xac/0xc3
[  408.215797] RSP: 0018:ffffc90008307de0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11
[  408.223421] RAX: 0000000000000000 RBX: ffffc90008307de0 RCX: 0000000000000000
[  408.230602] RDX: 0000000000000001 RSI: 00000000000008fb RDI: 0000000000000300
[  408.237777] RBP: ffffc90008307e30 R08: fffffffc3146e801 R09: 0000000000000003
[  408.244957] R10: 0000000000000000 R11: ffff88011a98af80 R12: 0000000000000001
[  408.252137] R13: 0000000000000000 R14: 00007f05bdefb104 R15: 000000000000001f
[  408.259318] FS:  00007f05be10d700(0000) GS:ffff88011fc80000(0000) knlGS:0000000000000000
[  408.267462] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  408.273258] CR2: 0000000000735980 CR3: 000000011a31a000 CR4: 00000000000407e0
[  408.280439] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  408.287620] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[  408.294798] Call Trace:
[  408.297300]  ? perf_event_sysfs_show+0x1d/0x1d
[  408.301792]  ? ctx_resched+0x84/0x84
[  408.305418]  ? task_function_call+0x35/0x48
[  408.309649]  task_function_call+0x35/0x48
[  408.313706]  ? perf_ctx_lock+0x1e/0x1e
[  408.317506]  event_function_call+0x60/0xa5
[  408.321652]  ? ctx_resched+0x84/0x84
[  408.325278]  ? _perf_event_disable+0x3e/0x3e
[  408.329598]  perf_event_for_each_child+0x4d/0x6b
[  408.334267]  perf_event_task_enable+0x66/0x9a
[  408.338673]  SyS_prctl+0x152/0x3ca
[  408.342126]  ? SyS_write+0x69/0x78
[  408.345581]  entry_SYSCALL_64_fastpath+0x17/0x70
[  408.350248] RIP: 0033:0x7f05bdc3ee7a
[  408.353872] RSP: 002b:00007ffc80e425c8 EFLAGS: 00000202
[  408.353874] Code: 01 74 04 f3 90 eb f4 83 48 18 01 48 89 d1 44 89 d7 48 89 f2 48 89 de e8 c9 fe ff ff 45 85 e4 74 12 8b 53 18 80 e2 01 74 04 f3 90 <eb> f4 eb 04 0f ff eb ad 48 83 c4 38 5b 41 5a 41 5c 5d 49 8d 62