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Date: Thu, 16 Nov 2017 00:54:31 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org, wfg@...ux.intel.com
Subject: 60a77bfd24 ("membarrier: x86: Provide core serializing command
.."): BUG: unable to handle kernel paging request at ffff88001c44c480
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 60a77bfd24d564603f894bd60a92967c8be9d8ad
Author: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
AuthorDate: Mon Oct 23 23:20:43 2017 +0200
Commit: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CommitDate: Tue Nov 14 20:15:28 2017 -0500
membarrier: x86: Provide core serializing command (v2)
There are two places where core serialization is needed by membarrier:
1) When returning from the membarrier IPI,
2) After scheduler updates curr to a thread with a different mm, before
going back to user-space, since the curr->mm is used by membarrier to
check whether it needs to send an IPI to that CPU.
x86-32 uses iret as return from interrupt, and both iret and sysexit to go
back to user-space. The iret instruction is core serializing, but not
sysexit.
x86-64 uses iret as return from interrupt, which takes care of the IPI.
However, it can return to user-space through either sysretl (compat
code), sysretq, or iret. Given that sysret{l,q} is not core serializing,
we rely instead on write_cr3() performed by switch_mm() to provide core
serialization after changing the current mm, and deal with the special
case of kthread -> uthread (temporarily keeping current mm into
active_mm) by adding a sync_core() in that specific case.
Use the new sync_core_before_usermode() to guarantee this.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Andy Lutomirski <luto@...nel.org>
CC: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
CC: Boqun Feng <boqun.feng@...il.com>
CC: Andrew Hunter <ahh@...gle.com>
CC: Maged Michael <maged.michael@...il.com>
CC: Avi Kivity <avi@...lladb.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Michael Ellerman <mpe@...erman.id.au>
CC: Dave Watson <davejwatson@...com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: Andrea Parri <parri.andrea@...il.com>
CC: Russell King <linux@...linux.org.uk>
CC: Greg Hackmann <ghackmann@...gle.com>
CC: Will Deacon <will.deacon@....com>
CC: David Sehr <sehr@...gle.com>
CC: x86@...nel.org
CC: linux-arch@...r.kernel.org
---
Changes since v1:
- Use the newly introduced sync_core_before_usermode(). Move all state
handling to generic code.
- Add linux/processor.h include to include/linux/sched/mm.h.
533bd7403b x86: Introduce sync_core_before_usermode (v2)
60a77bfd24 membarrier: x86: Provide core serializing command (v2)
63fb091c80 Add linux-next specific files for 20171115
+------------------------------------------+------------+------------+---------------+
| | 533bd7403b | 60a77bfd24 | next-20171115 |
+------------------------------------------+------------+------------+---------------+
| boot_successes | 35 | 0 | 38 |
| boot_failures | 0 | 11 | 17 |
| BUG:unable_to_handle_kernel | 0 | 11 | 13 |
| Oops:#[##] | 0 | 11 | 17 |
| RIP:finish_task_switch | 0 | 11 | 17 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 11 | 17 |
+------------------------------------------+------------+------------+---------------+
/etc/rcS.d/S00fbsetup: line 3: /sbin/modprobe: not found
Please wait: booting...
Starting udev
Kernel tests: Boot OK!
[ 7.517950] BUG: unable to handle kernel paging request at ffff88001c44c480
[ 7.519225] IP: finish_task_switch+0x136/0x200
[ 7.520017] PGD 1581a067 P4D 1581a067 PUD 1581b067 PMD 1fb1e067 PTE 800000001c44c060
[ 7.521361] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 7.522161] Modules linked in:
[ 7.522706] CPU: 0 PID: 175 Comm: udevd Not tainted 4.14.0-00023-g60a77bf #2
[ 7.523932] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 7.525375] task: ffff88001d598040 task.stack: ffffc9000025c000
[ 7.526405] RIP: 0010:finish_task_switch+0x136/0x200
[ 7.527278] RSP: 0018:ffffc9000025fe58 EFLAGS: 00010286
[ 7.528411] RAX: 0000000000000000 RBX: ffff88001f817e40 RCX: ffffea0000711220
[ 7.529655] RDX: 000000000000001b RSI: ffffffff975b1918 RDI: 0000000000000246
[ 7.530901] RBP: ffffc9000025fe80 R08: 0000000000000009 R09: ffff880000000000
[ 7.532140] R10: ffffc9000025fe10 R11: 000000000001bab0 R12: ffff88001d582740
[ 7.533359] R13: ffff88001c44c480 R14: ffff88001d598040 R15: 0000000000000080
[ 7.534548] FS: 00007f1d0811c700(0000) GS:ffff88001f800000(0000) knlGS:0000000000000000
[ 7.535903] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7.536864] CR2: ffff88001c44c480 CR3: 000000001d13a006 CR4: 00000000001606b0
[ 7.538153] Call Trace:
[ 7.538583] __schedule+0x35f/0x6e0
[ 7.539178] schedule+0x38/0x90
[ 7.539709] exit_to_usermode_loop+0x52/0xa0
[ 7.540431] syscall_return_slowpath+0xa0/0xd0
[ 7.541181] entry_SYSCALL_64_fastpath+0xa3/0xa5
[ 7.541961] RIP: 0033:0x7f1d07bb0b17
[ 7.542560] RSP: 002b:00007ffe1d2d3248 EFLAGS: 00000297 ORIG_RAX: 000000000000003e
[ 7.543817] RAX: 0000000000000000 RBX: 000000000064e020 RCX: 00007f1d07bb0b17
[ 7.545113] RDX: 0000000000000bb8 RSI: 000000000000000f RDI: 000000000000012f
[ 7.546312] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
[ 7.547498] R10: 0000000000000040 R11: 0000000000000297 R12: 000000000000086c
[ 7.548887] R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000001a
[ 7.550073] Code: 00 e8 7f 47 08 00 41 80 a6 a4 1a 00 00 fe e9 41 ff ff ff 4c 89 f6 4c 89 e7 e8 27 fa 07 00 e9 2c ff ff ff 4c 89 ef e8 1a b5 fd ff <41> 8b 45 00 a8 20 0f 84 5d ff ff ff 8c d0 50 54 48 83 04 24 08
[ 7.553222] RIP: finish_task_switch+0x136/0x200 RSP: ffffc9000025fe58
[ 7.554300] CR2: ffff88001c44c480
[ 7.554870] ---[ end trace 2a0f9aefc66a5580 ]---
[ 7.555648] Kernel panic - not syncing: Fatal exception
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 63fb091c80188ec51f53514d07de907c1dd3d61d bebc6082da0a9f5d47a1ea2edc099bf671058bd4 --
git bisect good 8563f47cd795061a1dd8c38bcf5a0a2a4005dbfe # 18:27 G 11 0 0 0 Merge remote-tracking branch 'btrfs-kdave/for-next'
git bisect good b35dab54a17434688ba7a1c43cf116e71e28324e # 18:42 G 10 0 0 0 Merge remote-tracking branch 'selinux/next'
git bisect good b7fc9661e403772b1e6ce24fbf5fdece59719eef # 19:23 G 11 0 0 0 Merge remote-tracking branch 'driver-core/driver-core-next'
git bisect good 58b4bc1473ad38bf23a1549a645a7cf0a54112aa # 20:19 G 11 0 0 0 Merge remote-tracking branch 'pinctrl/for-next'
git bisect good f6e872ffc9ccea7056ef62e3a1759166a5e01487 # 21:03 G 11 0 0 0 Merge remote-tracking branch 'rtc/rtc-next'
git bisect bad 3a4ea8d0cfe837b751b3e06604974cc41d7c1d32 # 21:28 B 0 8 22 0 Merge remote-tracking branch 'rseq/rseq/for-next'
git bisect good c2ade8e2c37a1e001c49ebafa7b8b6b2bc6d6814 # 21:53 G 11 0 0 0 Merge remote-tracking branch 'nvdimm/libnvdimm-for-next'
git bisect good dd91ee9e7d4bc98f22ef06478ac7b26d4b37060a # 22:29 G 11 0 0 0 Merge remote-tracking branch 'kspp/for-next/kspp'
git bisect good b38f09891ff7da404a1cc2b37090ee1e0d9ea7b7 # 22:53 G 11 0 0 0 Restartable sequences: Provide self-tests (v2)
git bisect good 624fdd456867cb48e0b210c2ad8af574b3580616 # 23:20 G 11 0 0 0 membarrier: provide SHARED_EXPEDITED command (v2)
git bisect good 533bd7403b045adb57d98019f7d9f50d4f43e0b0 # 23:39 G 11 0 0 0 x86: Introduce sync_core_before_usermode (v2)
git bisect bad cf81771f4511fbdff96430ad23c3c9d73efe553f # 00:20 B 1 10 0 2 membarrier: selftest: Test private expedited sync core cmd
git bisect bad 60a77bfd24d564603f894bd60a92967c8be9d8ad # 00:42 B 0 10 25 1 membarrier: x86: Provide core serializing command (v2)
# first bad commit: [60a77bfd24d564603f894bd60a92967c8be9d8ad] membarrier: x86: Provide core serializing command (v2)
git bisect good 533bd7403b045adb57d98019f7d9f50d4f43e0b0 # 00:48 G 31 0 0 0 x86: Introduce sync_core_before_usermode (v2)
# extra tests on HEAD of linux-next/master
git bisect bad 63fb091c80188ec51f53514d07de907c1dd3d61d # 00:49 B 0 17 38 0 Add linux-next specific files for 20171115
# extra tests on tree/branch linux-next/master
git bisect bad 63fb091c80188ec51f53514d07de907c1dd3d61d # 00:51 B 0 17 38 0 Add linux-next specific files for 20171115
---
0-DAY kernel test infrastructure Open Source Technology Center
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