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SubjectPanic related to perf (bisected)
Date
Hi,

I've been hitting a freeze on my laptop since 5.3, but haven't got the
time to finish bisecting it. Now
I had, and here is what I found:

- 5.2 series works correctly (tested 5.2.9 and 5.2.15)
- 5.3 series and newer kernels freeze. The newest I tested is 5.6.10
(which also freezes). There will
  be a complete bisect log at the end of the mail.

There are several circumstances to reproduce the freeze. At least this
is what I found relevant:
- The freeze does not occur after a fresh boot, it needs a sleep-wakeup
cycle.
- Run `perf stat -a --topdown -- sleep 8s` every minute (It is part of
some metrics I collect using Zabbix)
- Some workload (building the kernel or gaming) increases the chance of
freezing, but it can occur
  without user interaction too.

The freeze usually comes within a few minutes after wakeup. The longest
was about an hour. (For
comparison, if I don't do a sleep-wakeup, the machine works fine for 8+
hours).

First, there is a warning in syslog, then I took pictures of the actual
panic.

The warning:
May 16 13:28:46 serpens kernel: [33128.086217] ------------[ cut here
]------------
May 16 13:28:46 serpens kernel: [33128.086222] WARNING: CPU: 0 PID: 0 at
arch/x86/events/core.c:1506 x86_pmu_del+0x140/0x160
May 16 13:28:46 serpens kernel: [33128.086223] Modules linked in:
nouveau mxm_wmi ttm ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc
iptable_filter binfmt_misc essiv authenc uvcvideo iwlmvm
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videodev mac80211
videobuf2_common snd_hda_codec_realtek snd_hda_codec_generic libarc4
snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hwdep intel_rapl_msr
iwlwifi snd_hda_core intel_rapl_common snd_pcm x86_pkg_temp_thermal
snd_seq mei_me cfg80211 snd_seq_device snd_timer mei intel_powerclamp
snd soundcore ideapad_laptop coretemp sparse_keymap ip_tables x_tables
dm_crypt hid_generic usbhid hid i915 intel_gtt i2c_algo_bit
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm
aesni_intel glue_helper crypto_simd r8169 ahci cryptd psmouse libahci
realtek drm_panel_orientation_quirks video wmi
May 16 13:28:46 serpens kernel: [33128.086247] CPU: 0 PID: 0 Comm:
swapper/0 Not tainted 5.6.10 #52
May 16 13:28:46 serpens kernel: [33128.086247] Hardware name: LENOVO
20378/Lenovo Y50-70, BIOS 9ECN36WW(V2.00) 01/12/2015
May 16 13:28:46 serpens kernel: [33128.086249] RIP:
0010:x86_pmu_del+0x140/0x160
May 16 13:28:46 serpens kernel: [33128.086250] Code: 63 d8 48 c7 84 dd
20 07 00 00 00 00 00 00 4c 89 e7 89 85 14 02 00 00 e8 fe 27 16 00 e9 ef
fe ff ff 44 8d 6b 01 e9 5d ff ff ff <0f> 0b 5b 5d 41 5c 41 5d c3 31 db
e9 41 ff ff ff 41 bd 01 00 00 00
May 16 13:28:46 serpens kernel: [33128.086251] RSP:
0018:ffffa2a380003e40 EFLAGS: 00010046
May 16 13:28:46 serpens kernel: [33128.086252] RAX: 0000000000000005
RBX: 0000000000000005 RCX: 0000000000000010
May 16 13:28:46 serpens kernel: [33128.086253] RDX: 0000000000000005
RSI: 0000000000000005 RDI: ffff907c4d4b1000
May 16 13:28:46 serpens kernel: [33128.086254] RBP: ffff907d932125a0
R08: 0000000000000002 R09: 0000000000029f80
May 16 13:28:46 serpens kernel: [33128.086254] R10: ffffa2a380003eb0
R11: 0000000000000000 R12: ffff907c4d4b1000
May 16 13:28:46 serpens kernel: [33128.086255] R13: 0000000000000006
R14: ffff907d9326fc0c R15: ffff907d9326fb00
May 16 13:28:46 serpens kernel: [33128.086256] FS:
0000000000000000(0000) GS:ffff907d93200000(0000) knlGS:0000000000000000
May 16 13:28:46 serpens kernel: [33128.086256] CS:  0010 DS: 0000 ES:
0000 CR0: 0000000080050033
May 16 13:28:46 serpens kernel: [33128.086257] CR2: 00007f713c5b44b0
CR3: 000000008300a001 CR4: 00000000001606f0
May 16 13:28:46 serpens kernel: [33128.086257] Call Trace:
May 16 13:28:46 serpens kernel: [33128.086259]  <IRQ>
May 16 13:28:46 serpens kernel: [33128.086263]
event_sched_out.isra.116+0x89/0x1f0
May 16 13:28:46 serpens kernel: [33128.086264]
group_sched_out.part.118+0x55/0xd0
May 16 13:28:46 serpens kernel: [33128.086265] ctx_sched_out+0x207/0x240
May 16 13:28:46 serpens kernel: [33128.086267]
perf_mux_hrtimer_handler+0x267/0x310
May 16 13:28:46 serpens kernel: [33128.086269]  ?
__perf_install_in_context+0x220/0x220
May 16 13:28:46 serpens kernel: [33128.086270]
__hrtimer_run_queues+0xfa/0x260
May 16 13:28:46 serpens kernel: [33128.086272] hrtimer_interrupt+0xe5/0x240
May 16 13:28:46 serpens kernel: [33128.086275]  ?
recalibrate_cpu_khz+0x10/0x10
May 16 13:28:46 serpens kernel: [33128.086278]
smp_apic_timer_interrupt+0x62/0x120
May 16 13:28:46 serpens kernel: [33128.086280] apic_timer_interrupt+0xf/0x20
May 16 13:28:46 serpens kernel: [33128.086281]  </IRQ>
May 16 13:28:46 serpens kernel: [33128.086284] RIP:
0010:cpuidle_enter_state+0xb6/0x3f0
May 16 13:28:46 serpens kernel: [33128.086285] Code: c4 0f 1f 44 00 00
31 ff e8 d7 bf a9 ff 80 7c 24 0b 00 74 12 9c 58 f6 c4 02 0f 85 12 03 00
00 31 ff e8 0e 74 af ff fb 45 85 ed <0f> 88 ad 02 00 00 49 63 c5 4c 2b
24 24 48 8d 14 40 48 8d 14 90 48
May 16 13:28:46 serpens kernel: [33128.086285] RSP:
0018:ffffffffb5003e58 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
May 16 13:28:46 serpens kernel: [33128.086286] RAX: ffff907d9322a700
RBX: ffff907d93232c00 RCX: 000000000000001f
May 16 13:28:46 serpens kernel: [33128.086287] RDX: 00001e213bcf5a93
RSI: 0000000033518eeb RDI: 0000000000000000
May 16 13:28:46 serpens kernel: [33128.086288] RBP: ffffffffb50be6a0
R08: 0000000000000002 R09: 0000000000029f80
May 16 13:28:46 serpens kernel: [33128.086288] R10: ffffffffb5003e40
R11: 000000000000004c R12: 00001e213bcf5a93
May 16 13:28:46 serpens kernel: [33128.086289] R13: 0000000000000001
R14: 0000000000000001 R15: ffffffffffffffff
May 16 13:28:46 serpens kernel: [33128.086291]  ?
cpuidle_enter_state+0x99/0x3f0
May 16 13:28:46 serpens kernel: [33128.086292] cpuidle_enter+0x29/0x40
May 16 13:28:46 serpens kernel: [33128.086295]  do_idle+0x1ff/0x270
May 16 13:28:46 serpens kernel: [33128.086296] cpu_startup_entry+0x19/0x20
May 16 13:28:46 serpens kernel: [33128.086299] start_kernel+0x4a6/0x4b3
May 16 13:28:46 serpens kernel: [33128.086302]
secondary_startup_64+0xa4/0xb0
May 16 13:28:46 serpens kernel: [33128.086303] ---[ end trace
6d25af1bc8d0e9ca ]---

Here are the photos of the panic: https://postimg.cc/gallery/Ywm0Ywd
(Same panic, just taken
multiple photos to be readable).

Here is another photo of a panic from another machine:
https://i.postimg.cc/d00s8Ncb/DSC-0395.jpg
Same setup regarding perf stat -a and the sleep-wakeup, but can't
remember the exact kernel
version I was running.

I tried reverting fd7d55172d1e2e501e6da0a5c1de25f06612dc2e which is the
first bad commit
according to my bisect, but there were conflicts, and I'm not a kernel
developer, I couldn't resolve
them.

Bisect log:

git bisect start
# bad: [70c707aae3e586f6ebc677ad733a9c3cea32f7ac] Linux 5.5.1
git bisect bad 70c707aae3e586f6ebc677ad733a9c3cea32f7ac
# good: [aad39e30fb9e6e7212318a1dad898f36f1075648] Linux 5.2.9
git bisect good aad39e30fb9e6e7212318a1dad898f36f1075648
# good: [0ecfebd2b52404ae0c54a878c872bb93363ada36] Linux 5.2
git bisect good 0ecfebd2b52404ae0c54a878c872bb93363ada36
# bad: [3c30819dc68ab9498216421b6846123900c0a6d3] Merge
git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
git bisect bad 3c30819dc68ab9498216421b6846123900c0a6d3
# bad: [d9b9c893048e9d308a833619f0866f1f52778cf5] Merge tag
'ceph-for-5.3-rc1' of git://github.com/ceph/ceph-client
git bisect bad d9b9c893048e9d308a833619f0866f1f52778cf5
# bad: [db0457338ece7482378d88e50ad298191c3e6947] Merge branch
'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
git bisect bad db0457338ece7482378d88e50ad298191c3e6947
# bad: [608745f12462e2d8d94d5cc5dc94bf0960a881e3] Merge branch
'perf-core-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 608745f12462e2d8d94d5cc5dc94bf0960a881e3
# good: [947fbd4ca9fb38f320b076e68cfccab977c5ea01] Merge tag
'please-pull-for_5.3' of
git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras
git bisect good 947fbd4ca9fb38f320b076e68cfccab977c5ea01
# good: [0dcb4efb1095d0a1f5f681c2b94e98b009cc5d77] ALSA: firewire-lib:
code refactoring for local variables
git bisect good 0dcb4efb1095d0a1f5f681c2b94e98b009cc5d77
# good: [cf2d213e49fdf47e4c10dc629a3659e0026a54b8] Merge tag
'pm-5.3-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect good cf2d213e49fdf47e4c10dc629a3659e0026a54b8
# bad: [fe96245c7f38c4ea92c1c599b43f176e27d9921e] perf hists: Add
block_info in hist_entry
git bisect bad fe96245c7f38c4ea92c1c599b43f176e27d9921e
# good: [87407fa58b6645cecd24102f58476b8dd7ce778d] perf config: Update
default value for llvm.clang-bpf-cmd-template
git bisect good 87407fa58b6645cecd24102f58476b8dd7ce778d
# skip: [78d6ccce03e86de34c7000bcada493ed0679e350] perf build: Handle
slang being in /usr/include and in /usr/include/slang/
git bisect skip 78d6ccce03e86de34c7000bcada493ed0679e350
# good: [b9271f0c65e12efd9b6319f57a378aac1be98b22] Merge tag 'v5.2-rc6'
into perf/core, to refresh branch
git bisect good b9271f0c65e12efd9b6319f57a378aac1be98b22
# good: [203dffacf592317e54480704f569a09f8b7ca380] Documentation/ABI:
Document umwait control sysfs interfaces
git bisect good 203dffacf592317e54480704f569a09f8b7ca380
# bad: [cf8b6970f4fc31898f3d9e25159aa57e235ca4d1] perf symbols: We need
util.h in symbol-elf.c for zfree()
git bisect bad cf8b6970f4fc31898f3d9e25159aa57e235ca4d1
# bad: [9f94c7f947e919c343b30f080285af53d0fa9902] perf tools: Increase
MAX_NR_CPUS and MAX_CACHES
git bisect bad 9f94c7f947e919c343b30f080285af53d0fa9902
# good: [122f1c51b11a9e572263c4965d772381fcef06c5] perf/x86/rapl: Get
MSR values from new probe framework
git bisect good 122f1c51b11a9e572263c4965d772381fcef06c5
# bad: [2d7102a0453769fd37e9f4ce68652e104fbf5c84] perf tools: Fix
cache.h include directive
git bisect bad 2d7102a0453769fd37e9f4ce68652e104fbf5c84
# good: [637d97b53cdded02da55d0a25cda6fd6af3bd042] perf/x86/rapl: Get
quirk state from new probe framework
git bisect good 637d97b53cdded02da55d0a25cda6fd6af3bd042
# bad: [fd7d55172d1e2e501e6da0a5c1de25f06612dc2e] perf/cgroups: Don't
rotate events for cgroups unnecessarily
git bisect bad fd7d55172d1e2e501e6da0a5c1de25f06612dc2e
# first bad commit: [fd7d55172d1e2e501e6da0a5c1de25f06612dc2e]
perf/cgroups: Don't rotate events for cgroups unnecessarily

Is there any more information that I can gather to make this issue
easier to fix?

Thanks,
Tibor Billes

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