Date:	Thu, 22 Oct 2015 12:46:53 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-kernel@...r.kernel.org
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...il.com>
Subject: perf: fuzzer triggered trouble on AMD, maybe ibs related

Hello

I've been busy but finally had a chance to run perf_fuzzer on current git.
I am running on an AMD A10 system (my traditional Haswell system is 
otherwise occupied).

I got the following WARNING which was followed by an NMI storm which 
eventually managed to confuse ext4 enough that my / partition was 
remounted read-only? Very alarming.

This is in static void perf_ibs_start(struct perf_event *event, int flags)

	if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED)))
                return;

[  359.629045] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/perf_event_amd_ibs.c:372 perf_ibs_start+0x43/0x131()
[  359.639091] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc nls_utf8 nls_cp437 vfat fat snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi kvm_amd kvm sha256_generic hmac drbg ansi_cprng aesni_intel aes_x86_64 snd_hda_intel ablk_helper cryptd snd_hda_codec lrw snd_hda_core gf128mul glue_helper ppdev snd_hwdep hp_wmi snd_pcm evdev sparse_keymap snd_timer pl2303 radeon ttm drm_kms_helper tpm_infineon pcspkr drm efivars psmouse serio_raw i2c_piix4 i2c_algo_bit usbserial fb_sys_fops shpchp k10temp parport_pc snd syscopyarea i2c_core parport soundcore tpm_tis wmi sysfillrect button tpm sysimgblt acpi_cpufreq processor sg sr_mod cdrom sd_mod ohci_pci ahci libahci tg3 xhci_pci ptp pps_core libata xhci_hcd ohci_hcd ehci_pci libphy ehci_hcd crc32c_intel
[  359.711502]  scsi_mod usbcore usb_common
[  359.714203] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W       4.3.0-rc6+ #12
[  359.721804] Hardware name: Hewlett-Packard HP Compaq Pro 6305 SFF/1850, BIOS K06 v02.57 08/16/2013
[  359.730808]  0000000000000006 ffffffff8123e6b7 0000000000000000 ffffffff8104519a
[  359.738322]  ffffffff8102a003 ffff880224098c00 ffffe8ffffc036d0 ffffffff81824ec0
[  359.745832]  ffff88022ec0f8e0 ffffffff8102a003 ffff880224098c00 ffffe8ffffc06a70
[  359.753328] Call Trace:
[  359.755793]  <IRQ>  [<ffffffff8123e6b7>] ? dump_stack+0x40/0x50
[  359.761762]  [<ffffffff8104519a>] ? warn_slowpath_common+0x94/0xa9
[  359.767963]  [<ffffffff8102a003>] ? perf_ibs_start+0x43/0x131
[  359.773730]  [<ffffffff8102a003>] ? perf_ibs_start+0x43/0x131
[  359.779495]  [<ffffffff810d8842>] ? perf_event_task_tick+0x101/0x1b5
[  359.785874]  [<ffffffff8109476c>] ? tick_sched_do_timer+0x24/0x24
[  359.791990]  [<ffffffff81063628>] ? scheduler_tick+0x64/0x7d
[  359.797673]  [<ffffffff810896fd>] ? update_process_times+0x3b/0x45
[  359.803876]  [<ffffffff810942d3>] ? tick_sched_handle+0x3e/0x4a
[  359.809820]  [<ffffffff8109479b>] ? tick_sched_timer+0x2f/0x53
[  359.815676]  [<ffffffff81089f55>] ? __hrtimer_run_queues+0xb9/0x18b
[  359.821967]  [<ffffffff8108a1e8>] ? hrtimer_interrupt+0x61/0x101
[  359.827995]  [<ffffffff8102d417>] ? smp_apic_timer_interrupt+0x20/0x2f
[  359.834549]  [<ffffffff8141e58f>] ? apic_timer_interrupt+0x7f/0x90
[  359.840745]  <EOI>  [<ffffffff8133f769>] ? cpuidle_enter_state+0xf3/0x145
[  359.847579]  [<ffffffff8106ebab>] ? cpu_startup_entry+0x170/0x1db
[  359.853694]  [<ffffffff818eddfd>] ? start_kernel+0x40b/0x413
[  359.859371] ---[ end trace 93964ed985254224 ]---
[  360.468852] Uhhuh. NMI received for unknown reason 2d on CPU 2.
[  360.474790] Do you have a strange power saving mode enabled?
[  360.480454] Dazed and confused, but trying to continue
[  360.695032] Uhhuh. NMI received for unknown reason 2d on CPU 1.
[  360.700985] Do you have a strange power saving mode enabled?
[  360.706666] Dazed and confused, but trying to continue
[  361.739498] Uhhuh. NMI received for unknown reason 3d on CPU 0.
[  361.745438] Do you have a strange power saving mode enabled?
[  361.751104] Dazed and confused, but trying to continue
[  361.828053] Uhhuh. NMI received for unknown reason 3d on CPU 0.
[  361.833989] Do you have a strange power saving mode enabled?
[  361.839677] Dazed and confused, but trying to continue

.....

[  468.763231] Dazed and confused, but trying to continue
[  468.794184] Uhhuh. NMI received for unknown reason 2d on CPU 2.
[  468.794184] Do you have a strange power saving mode enabled?
[  468.794184] Dazed and confused, but trying to continue
[  473.190535] sd 0:0:0:0: [sda] tag#2 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT
[  473.199631] sd 0:0:0:0: [sda] tag#2 CDB: Write(10) 2a 00 39 93 49 d0 00 00 18 00
[  473.207789] blk_update_request: I/O error, dev sda, sector 965954000
[  473.214857] Aborting journal on device sda2-8.
[  473.214868] EXT4-fs (sda2): ext4_writepages: jbd2_start: 7158 pages, ino 27394094; err -30
[  473.214880] EXT4-fs (sda2): ext4_writepages: jbd2_start: 7168 pages, ino 27395265; err -30
[  473.215802] EXT4-fs (sda2): ext4_writepages: jbd2_start: 7168 pages, ino 27394094; err -30
[  473.215806] EXT4-fs (sda2): ext4_writepages: jbd2_start: 7168 pages, ino 27395265; err -30
[  473.215811] EXT4-fs (sda2): ext4_writepages: jbd2_start: 7168 pages, ino 27394094; err -30
[  473.215814] EXT4-fs (sda2): ext4_writepages: jbd2_start: 7168 pages, ino 27395265; err -30
[  473.215849] EXT4-fs (sda2): ext4_writepages: jbd2_start: 9223372036854775807 pages, ino 27394094; err -30
[  473.215859] EXT4-fs (sda2): ext4_writepages: jbd2_start: 9223372036854775807 pages, ino 27395265; err -30
[  473.409076] EXT4-fs error (device sda2): ext4_journal_check_start:56: Detected aborted journal
[  473.419003] EXT4-fs (sda2): Remounting filesystem read-only

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