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Message-ID: <5d384f96.dD36t9B/8FDRT5y1%lkp@intel.com>
Date: Wed, 24 Jul 2019 20:31:18 +0800
From: kernel test robot <lkp@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: LKP <lkp@...org>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>, philip.li@...el.com
Subject: a0d14b8909 ("x86/mm, tracing: Fix CR2 corruption"): Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master
commit a0d14b8909de55139b8702fe0c7e80b69763dcfb
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu Jul 11 13:40:59 2019 +0200
Commit: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed Jul 17 23:17:38 2019 +0200
x86/mm, tracing: Fix CR2 corruption
Despite the current efforts to read CR2 before tracing happens there still
exist a number of possible holes:
idtentry page_fault do_page_fault has_error_code=1
call error_entry
TRACE_IRQS_OFF
call trace_hardirqs_off*
#PF // modifies CR2
CALL_enter_from_user_mode
__context_tracking_exit()
trace_user_exit(0)
#PF // modifies CR2
call do_page_fault
address = read_cr2(); /* whoopsie */
And similar for i386.
Fix it by pulling the CR2 read into the entry code, before any of that
stuff gets a chance to run and ruin things.
Reported-by: He Zhe <zhe.he@...driver.com>
Reported-by: Eiichi Tsukata <devel@...ukata.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Andy Lutomirski <luto@...nel.org>
Cc: bp@...en8.de
Cc: rostedt@...dmis.org
Cc: torvalds@...ux-foundation.org
Cc: hpa@...or.com
Cc: dave.hansen@...ux.intel.com
Cc: jgross@...e.com
Cc: joel@...lfernandes.org
Link: https://lkml.kernel.org/r/20190711114336.116812491@infradead.org
Debugged-by: Steven Rostedt <rostedt@...dmis.org>
4234653e88 x86/entry/64: Update comments and sanity tests for create_gap
a0d14b8909 x86/mm, tracing: Fix CR2 corruption
ad5e427e0f Merge branch 'parisc-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
9e6dfe8045 Add linux-next specific files for 20190724
+------------------------------------------------+------------+------------+------------+---------------+
| | 4234653e88 | a0d14b8909 | ad5e427e0f | next-20190724 |
+------------------------------------------------+------------+------------+------------+---------------+
| boot_successes | 31 | 0 | 0 | 0 |
| boot_failures | 0 | 11 | 6 | 8 |
| Kernel_panic-not_syncing:No_working_init_found | 0 | 11 | 6 | 8 |
+------------------------------------------------+------------+------------+------------+---------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>
[ 15.632639] Starting init: /sbin/init exists but couldn't execute it (error -14)
[ 15.634040] Run /etc/init as init process
[ 15.634890] Run /bin/init as init process
[ 15.635402] Run /bin/sh as init process
[ 15.636008] Starting init: /bin/sh exists but couldn't execute it (error -14)
[ 15.636789] Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[ 15.638408] CPU: 0 PID: 1 Comm: init Tainted: G T 5.2.0-08454-ga0d14b8 #1
[ 15.639263] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 15.640145] Call Trace:
[ 15.640427] ? dump_stack+0x8f/0xd5
[ 15.640812] ? rest_init+0x190/0x250
[ 15.641206] ? panic+0xd7/0x35b
[ 15.641624] ? rest_init+0x250/0x250
[ 15.642070] ? kernel_init+0x17b/0x190
[ 15.642479] ? ret_from_fork+0x33/0x40
[ 15.643608] Kernel Offset: disabled
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 5f9e832c137075045d15cd6899ab0505cfb2ca4b 22051d9c4a57d3b4a8b5a7407efc80c71c7bfb16 --
git bisect good a84d2d2906f983fb80f5dcc3e8e7c3ad70aa9f0d # 08:14 G 10 0 0 0 Merge tag 'csky-for-linus-5.3-rc1' of git://github.com/c-sky/csky-linux
git bisect good 70e6e1b971e46f5c1c2d72217ba62401a2edc22b # 13:28 G 10 0 0 0 Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad f1a3b43cc1f50c6ee5ba582f2025db3dea891208 # 13:54 B 0 2 18 0 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
git bisect good 46f5c0cc3af0ecb76224a91d2997d74e35ff7821 # 14:27 G 10 0 1 1 Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad c6dd78fcb8eefa15dd861889e0f59d301cb5230c # 14:48 B 0 3 19 0 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 55aedddb6149ab71bec9f050846855113977b033 # 15:10 G 11 0 0 0 x86/paravirt: Make read_cr2() CALLEE_SAVE
git bisect bad cd6697b8b8751b65abd7859af55cf06f36b8e716 # 15:29 B 0 2 18 0 x86/boot/efi: Remove unused variables
git bisect good 2fd37912cfb019228bf246215938e6f7619516a2 # 15:57 G 11 0 0 0 x86/entry/64: Simplify idtentry a little
git bisect bad a0d14b8909de55139b8702fe0c7e80b69763dcfb # 16:06 B 0 1 16 0 x86/mm, tracing: Fix CR2 corruption
git bisect good 4234653e882740cbf6625eeee294e388b3176583 # 16:36 G 11 0 0 0 x86/entry/64: Update comments and sanity tests for create_gap
# first bad commit: [a0d14b8909de55139b8702fe0c7e80b69763dcfb] x86/mm, tracing: Fix CR2 corruption
git bisect good 4234653e882740cbf6625eeee294e388b3176583 # 16:43 G 30 0 0 0 x86/entry/64: Update comments and sanity tests for create_gap
# extra tests on HEAD of linus/master
git bisect bad 7b5cf701ea9c395c792e2a7e3b7caf4c68b87721 # 17:06 B 0 1 17 0 Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
# extra tests on tree/branch linus/master
git bisect bad ad5e427e0f6b702e52c11d1f7b2b7be3bac7de82 # 20:09 B 0 7 23 0 Merge branch 'parisc-5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
# extra tests on tree/branch linux-next/master
git bisect bad 9e6dfe8045f85f9b5aade47e4192482927e2791a # 20:30 B 0 6 23 0 Add linux-next specific files for 20190724
---
0-DAY kernel test infrastructure Open Source Technology Center
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