[Bug 103706] [CI][BAT] igt* incomplete - /dev/kmsg buffer overrun, some messages lost - pstore cleanout broken

Wed Dec 13 08:24:36 UTC 2017

https://bugs.freedesktop.org/show_bug.cgi?id=103706

--- Comment #50 from Marta Löfstedt <marta.lofstedt at intel.com> ---
I forced panic:ed shards-hsw4 when it was booted on
4.15.0-rc3-CI-Patchwork_7478+
The machine rebooted to pstore kernel:
4.15.0-rc3-CI-Patchwork_7478+
Welcome to Ubuntu 17.04 (GNU/Linux 4.11.0-rc3-pstore+ x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage
Last login: Wed Dec 13 10:14:49 2017 from 10.237.72.167
testrunner at hsw4:~$ uname -r
4.11.0-rc3-pstore+
testrunner at hsw4:~$ ls /sys/fs/pstore
dmesg-efi-151315300001001  dmesg-efi-151315300202001
testrunner at hsw4:~$ cat /sys/fs/pstore/dmesg-efi-151315300001001 
Oops#1 Part1
<4>[23212.086286] FS:  00007f69bbcc1700(0000) GS:ffff88041fb40000(0000)
knlGS:0000000000000000
<4>[23212.086291] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[23212.086294] CR2: 0000000000000000 CR3: 000000040b71b001 CR4:
00000000001606e0
<4>[23212.086298] Call Trace:
<4>[23212.086301]  __handle_sysrq+0x123/0x200
<4>[23212.086305]  write_sysrq_trigger+0x43/0x50
<4>[23212.086308]  proc_reg_write+0x38/0x60
<4>[23212.086313]  __vfs_write+0x1e/0x130
<4>[23212.086317]  ? rcu_read_lock_sched_held+0x6f/0x80
<4>[23212.086320]  ? rcu_sync_lockdep_assert+0x25/0x50
<4>[23212.086323]  ? __sb_start_write+0xd5/0x1f0
<4>[23212.086326]  ? __sb_start_write+0xef/0x1f0
<4>[23212.086330]  vfs_write+0xc0/0x1b0
<4>[23212.086334]  SyS_write+0x40/0xa0
<4>[23212.086337]  entry_SYSCALL_64_fastpath+0x1c/0x89
<4>[23212.086340] RIP: 0033:0x7f69bb7ed8f0
<4>[23212.086343] RSP: 002b:00007ffee4d1f668 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
<4>[23212.086348] RAX: ffffffffffffffda RBX: 000055c7c3c86bf0 RCX:
00007f69bb7ed8f0
<4>[23212.086352] RDX: 0000000000000002 RSI: 00007ffee4d1f750 RDI:
0000000000000003
<4>[23212.086356] RBP: 000055c7c3c86be8 R08: 000055c7c3c86d70 R09:
00007f69bbcc1700
<4>[23212.086360] R10: 0000000000000001 R11: 0000000000000246 R12:
00007f69bbcdd1ef
<4>[23212.086364] R13: 00007f69bbcdd1ec R14: 00007f69bbcdd000 R15:
0000000000000001
<4>[23212.086369] Code: 33 e8 e9 72 b9 ff 48 c7 c2 52 c8 55 81 be 01 00 00 00
48 c7 c7 c0 49 e4 81 e8 91 a2 b7 ff c7 05 57 e5 e7 00 01 00 00 00 0f ae f8 <c6>
04 25 00 00 00 00 01 c3 e8 b6 9e b9 ff 84 c0 75 c4 48 c7 c2 
<1>[23212.086402] RIP: sysrq_handle_crash+0x3c/0x70 RSP: ffffc90001acfe10
<4>[23212.086406] CR2: 0000000000000000
<4>[23212.086409] ---[ end trace a1025166a09c59fd ]---
testrunner at hsw4:~$ cat /sys/fs/pstore/dmesg-efi-151315300202001 
Oops#1 Part2
<6>[23212.086128] sysrq: SysRq : Trigger a crash
<1>[23212.086188] BUG: unable to handle kernel NULL pointer dereference at     
     (null)
<1>[23212.086196] IP: sysrq_handle_crash+0x3c/0x70
<6>[23212.086199] PGD 0 P4D 0 
<4>[23212.086211] Oops: 0002 [#1] PREEMPT SMP
<0>[23212.086215] Dumping ftrace buffer:
<0>[23212.086220]    (ftrace buffer empty)
<4>[23212.086222] Modules linked in: snd_hda_intel i915 i2c_dev vgem
snd_hda_codec_hdmi x86_pkg_temp_thermal snd_hda_codec_realtek intel_powerclamp
snd_hda_codec_generic coretemp crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core r8169 snd_pcm lpc_ich
mii prime_numbers mei_me mei [last unloaded: i915]
<4>[23212.086249] CPU: 5 PID: 2939 Comm: tee Tainted: G     U          
4.15.0-rc3-CI-Patchwork_7478+ #1
<4>[23212.086254] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12
02/15/2016
<4>[23212.086259] RIP: 0010:sysrq_handle_crash+0x3c/0x70
<4>[23212.086262] RSP: 0018:ffffc90001acfe10 EFLAGS: 00010282
<4>[23212.086266] RAX: ffff88040d328040 RBX: 0000000000000063 RCX:
1fcaac1f00000000
<4>[23212.086270] RDX: 0000000000000001 RSI: 00000000469deb48 RDI:
0000000000000000
<4>[23212.086274] RBP: ffffc90001acfe38 R08: ffff88040d328908 R09:
0000000067d877a6
<4>[23212.086278] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000004
<4>[23212.086282] R13: ffffffff81e9abc0 R14: 0000000000000000 R15:
00007f69bbab28c0

so, let's see when above will be pulled out.

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