From: Steven Rostedt <rostedt@goodmis.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Grant Likely <grant.likely@linaro.org>,
Rob Herring <robh@kernel.org>, Olof Johansson <olof@lixom.net>,
linuxppc-dev@lists.ozlabs.org
Subject: [REGRESSION in 3.18][PPC] PA Semi fails to boot after: of/base: Fix PowerPC address parsing hack
Date: Thu, 5 Mar 2015 17:12:39 -0500 [thread overview]
Message-ID: <20150305171239.3a8135e6@gandalf.local.home> (raw)
A bug in ftrace was reported to me that affects ARM and ARM64 but not
x86. Looking at the code it appears to affect PowerPC as well. So I
booted up my old PA Semi, to give it a try. The last time I booted it
was for a 3.17 kernel. Unfortunately, for 4.0-rc2 it crashed with:
Unable to handle kernel paging request for data at address 0x00000000
Faulting instruction address: 0xc0000000005cef88
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=2 PA Semi PWRficient
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.0.0-rc2-test #50
task: c00000003816cb60 ti: c0000000381a4000 task.ti: c0000000381a4000
NIP: c0000000005cef88 LR: c00000000007c1a0 CTR: c00000000007c184
REGS: c0000000381a7a00 TRAP: 0300 Not tainted (4.0.0-rc2-test)
MSR: 9000000000009032 <SF,HV,EE,ME,IR,DR,RI> CR: 22000028 XER: 00000000
DAR: 0000000000000000 DSISR: 40000000 SOFTE: 0
GPR00: c00000000007c1a0 c0000000381a7c80 c000000000af4b98 0000000000000001
GPR04: 0000000000000000 0000000000000000 00000000000004ba 000000003d6de000
GPR08: 0100000000000000 0000000000000000 c0000000381a4080 0000000000000000
GPR12: 0000000024044042 c00000000ffff300 ffffffffffffffed 0000000000000000
GPR16: c000000000afb920 c0000000381a4000 c0000000009ad648 c0000000009ae580
GPR20: c0000000381a4080 c0000000381a4000 c0000000381a4080 c0000000381a4000
GPR24: c0000000381a4000 c0000000381a4000 c000000000afb880 c0000000381a4000
GPR28: c0000000009f8790 0000000000000000 c0000000381a4000 c000000000b02168
NIP [c0000000005cef88] .check_astate+0x28/0x50
LR [c00000000007c1a0] sleep_common+0x14/0x74
Call Trace:
[c0000000381a7c80] [c000000000afb880] 0xc000000000afb880 (unreliable)
[c0000000381a7cf0] [c00000000007c1a0] sleep_common+0x14/0x74
[c0000000381a7d30] [c0000000000130f0] .arch_cpu_idle+0x70/0x160
[c0000000381a7db0] [c0000000000d6660] .cpu_startup_entry+0x320/0x5a0
[c0000000381a7ee0] [c000000000034570] .start_secondary+0x290/0x2c0
[c0000000381a7f90] [c000000000008bfc] start_secondary_prolog+0x10/0x14
Instruction dump:
60000000 60000000 7c0802a6 f8010010 f821ff91 60000000 60000000 3d220003
39296870 a86d0038 e9290010 7c0004ac <7c004c2c> 0c000000 4c00012c 5463103a
---[ end trace 40e864a431826b26 ]---
I kicked off a ktest bisect, and it came down to this commit:
commit 746c9e9f92dde2789908e51a354ba90a1962a2eb
Author: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri Nov 14 17:55:03 2014 +1100
of/base: Fix PowerPC address parsing hack
When I revert this from v4.0-rc2, I can successfully boot my PA Semi
again.
-- Steve
next reply other threads:[~2015-03-05 22:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-05 22:12 Steven Rostedt [this message]
2015-03-06 4:18 ` [REGRESSION in 3.18][PPC] PA Semi fails to boot after: of/base: Fix PowerPC address parsing hack Benjamin Herrenschmidt
2015-03-06 15:00 ` Steven Rostedt
2015-03-06 22:56 ` Benjamin Herrenschmidt
2015-03-06 23:07 ` Steven Rostedt
2015-03-06 23:50 ` Olof Johansson
2015-03-07 4:02 ` Benjamin Herrenschmidt
2015-03-10 0:28 ` Michael Ellerman
2015-03-10 0:33 ` Olof Johansson
2015-03-22 23:52 ` Michael Ellerman
2015-03-10 17:03 ` Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150305171239.3a8135e6@gandalf.local.home \
--to=rostedt@goodmis.org \
--cc=benh@kernel.crashing.org \
--cc=grant.likely@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=olof@lixom.net \
--cc=robh@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).