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From: Guenter Roeck <linux@roeck-us.net>
To: Will Deacon <will@kernel.org>
Cc: linux-kernel@vger.kernel.org, elver@google.com,
	tglx@linutronix.de, paulmck@kernel.org, mingo@kernel.org,
	peterz@infradead.org, "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables
Date: Sat, 16 May 2020 17:00:50 -0700	[thread overview]
Message-ID: <20200517000050.GA87467@roeck-us.net> (raw)
In-Reply-To: <20200511204150.27858-5-will@kernel.org>

On Mon, May 11, 2020 at 09:41:36PM +0100, Will Deacon wrote:
> Now that the page table allocator can free page table allocations
> smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations
> to avoid needlessly wasting memory.
> 
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Signed-off-by: Will Deacon <will@kernel.org>

Something in the sparc32 patches in linux-next causes all my sparc32 emulations
to crash. bisect points to this patch, but reverting it doesn't help, and neither
does reverting the rest of the series.

Guenter

---
Bisect log:

# bad: [bdecf38f228bcca73b31ada98b5b7ba1215eb9c9] Add linux-next specific files for 20200515
# good: [2ef96a5bb12be62ef75b5828c0aab838ebb29cb8] Linux 5.7-rc5
git bisect start 'HEAD' 'v5.7-rc5'
# bad: [3674d7aa7a8e61d993886c2fb7c896c5ef85e988] Merge remote-tracking branch 'crypto/master'
git bisect bad 3674d7aa7a8e61d993886c2fb7c896c5ef85e988
# bad: [1ab4d6ff0a3ee4b29441d8b0076bc8d4734bd16e] Merge remote-tracking branch 'hwmon-staging/hwmon-next'
git bisect bad 1ab4d6ff0a3ee4b29441d8b0076bc8d4734bd16e
# good: [dccfae3ab84387c94f2efc574d41efae005eeee5] Merge remote-tracking branch 'tegra/for-next'
git bisect good dccfae3ab84387c94f2efc574d41efae005eeee5
# bad: [20f9d1287c9f0047b81497197c9f4893485bbe15] Merge remote-tracking branch 'djw-vfs/vfs-for-next'
git bisect bad 20f9d1287c9f0047b81497197c9f4893485bbe15
# bad: [6537897637b5b91f921cb0ac6c465a593f4a665e] Merge remote-tracking branch 'sparc-next/master'
git bisect bad 6537897637b5b91f921cb0ac6c465a593f4a665e
# good: [bca1583e0693e0ba76450b684c5910f7083eeef4] Merge remote-tracking branch 'mips/mips-next'
git bisect good bca1583e0693e0ba76450b684c5910f7083eeef4
# good: [1f12096aca212af8fad3ef58d5673cde691a1452] Merge the lockless page table walk rework into next
git bisect good 1f12096aca212af8fad3ef58d5673cde691a1452
# good: [23a457b8d57dc8d0cc1dbd1882993dd2fcc4b0c0] s390: nvme reipl
git bisect good 23a457b8d57dc8d0cc1dbd1882993dd2fcc4b0c0
# good: [f57f5010c0c3fe2d924a957ddf1d17fbebb54d47] Merge remote-tracking branch 'risc-v/for-next'
git bisect good f57f5010c0c3fe2d924a957ddf1d17fbebb54d47
# good: [1d5fd6c33b04e5d5b665446c3b56f2148f0f1272] sh: add missing DECLARE_EXPORT() for __ashiftrt_r4_xx
git bisect good 1d5fd6c33b04e5d5b665446c3b56f2148f0f1272
# bad: [8c8f3156dd40f8bdc58f2ac461374bc804c28e3b] sparc32: mm: Reduce allocation size for PMD and PTE tables
git bisect bad 8c8f3156dd40f8bdc58f2ac461374bc804c28e3b
# good: [8e958839e4b9fb6ea4385ff2c52d1333a3a618de] sparc32: mm: Restructure sparc32 MMU page-table layout
git bisect good 8e958839e4b9fb6ea4385ff2c52d1333a3a618de
# good: [3f407976ac2953116cb8880a7a18b63bcc81829d] sparc32: mm: Change pgtable_t type to pte_t * instead of struct page *
git bisect good 3f407976ac2953116cb8880a7a18b63bcc81829d
# first bad commit: [8c8f3156dd40f8bdc58f2ac461374bc804c28e3b] sparc32: mm: Reduce allocation size for PMD and PTE tables

---
Log messages:

Lots of:

BUG: scheduling while atomic: kthreadd/2/0xffffffff
Modules linked in:
CPU: 0 PID: 2 Comm: kthreadd Tainted: G        W         5.7.0-rc5-next-20200515 #1
[f04f2c94 :
here+0x16c/0x250 ]
[f04f2df0 :
schedule+0x78/0x11c ]
[f003f100 :
kthreadd+0x188/0x1a4 ]
[f0008448 :
ret_from_kernel_thread+0xc/0x38 ]
[00000000 :
0x0 ]

followed by:

Kernel panic - not syncing: Aiee, killing interrupt handler!
CPU: 0 PID: 19 Comm: cryptomgr_test Tainted: G        W         5.7.0-rc5-next-20200515 #1
[f0024400 :
do_exit+0x7c8/0xa88 ]
[f0075540 :
__module_put_and_exit+0xc/0x18 ]
[f0221428 :
cryptomgr_test+0x28/0x48 ]
[f003edc0 :
kthread+0xf4/0x12c ]
[f0008448 :
ret_from_kernel_thread+0xc/0x38 ]
[00000000 :
0x0 ]

  parent reply	other threads:[~2020-05-17  0:00 UTC|newest]

Thread overview: 127+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-11 20:41 [PATCH v5 00/18] Rework READ_ONCE() to improve codegen Will Deacon
2020-05-11 20:41 ` [PATCH v5 01/18] sparc32: mm: Fix argument checking in __srmmu_get_nocache() Will Deacon
2020-05-12 14:37   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 02/18] sparc32: mm: Restructure sparc32 MMU page-table layout Will Deacon
2020-05-12 14:37   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 03/18] sparc32: mm: Change pgtable_t type to pte_t * instead of struct page * Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-17  0:00   ` Guenter Roeck [this message]
2020-05-17  0:07     ` [PATCH v5 04/18] " Guenter Roeck
2020-05-18  8:37       ` Will Deacon
2020-05-18  9:18         ` Mike Rapoport
2020-05-18  9:48         ` Guenter Roeck
2020-05-18 14:23           ` Mike Rapoport
2020-05-18 16:08             ` Guenter Roeck
2020-05-18 18:11               ` Ira Weiny
2020-05-18 18:14               ` Ira Weiny
2020-05-18 18:09             ` Guenter Roeck
2020-05-18 18:21               ` Ira Weiny
2020-05-18 19:15               ` Mike Rapoport
2020-05-19 16:40                 ` Guenter Roeck
2020-05-20 17:03         ` Mike Rapoport
2020-05-20 19:03           ` Guenter Roeck
2020-05-20 19:51             ` Mike Rapoport
2020-05-21 23:02               ` Guenter Roeck
2020-05-24 12:32                 ` Mike Rapoport
2020-05-24 14:01                   ` Guenter Roeck
2020-05-26 13:26                   ` Will Deacon
2020-05-26 14:01                     ` Will Deacon
2020-05-26 15:21                       ` Mike Rapoport
2020-05-26 16:18                       ` Guenter Roeck
2020-05-26 16:29                         ` Mike Rapoport
2020-05-26 17:15                           ` Guenter Roeck
2020-05-11 20:41 ` [PATCH v5 05/18] compiler/gcc: Raise minimum GCC version for kernel builds to 4.8 Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 06/18] netfilter: Avoid assigning 'const' pointer to non-const pointer Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 07/18] net: tls: " Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 08/18] fault_inject: Don't rely on "return value" from WRITE_ONCE() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 09/18] arm64: csum: Disable KASAN for do_csum() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 10/18] READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 11/18] READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 12/18] READ_ONCE: Drop pointer qualifiers when reading from scalar types Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 13/18] locking/barriers: Use '__unqual_scalar_typeof' for load-acquire macros Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 14/18] arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release macros Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 15/18] gcov: Remove old GCC 3.4 support Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 16/18] kcsan: Rework data_race() so that it can be used by READ_ONCE() Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-11 20:41 ` [PATCH v5 17/18] READ_ONCE: Use data_race() to avoid KCSAN instrumentation Will Deacon
2020-05-12  8:23   ` Peter Zijlstra
2020-05-12  9:49     ` Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-20 22:17     ` Borislav Petkov
2020-05-20 22:30       ` Marco Elver
2020-05-21  7:25         ` Borislav Petkov
2020-05-21  9:37           ` Marco Elver
2020-05-21  3:30       ` Nathan Chancellor
2020-05-22 16:08       ` [tip: locking/kcsan] compiler.h: Avoid nested statement expression in data_race() tip-bot2 for Marco Elver
2020-05-11 20:41 ` [PATCH v5 18/18] linux/compiler.h: Remove redundant '#else' Will Deacon
2020-05-12 14:36   ` [tip: locking/kcsan] " tip-bot2 for Will Deacon
2020-05-12  8:18 ` [PATCH v5 00/18] Rework READ_ONCE() to improve codegen Peter Zijlstra
2020-05-12 17:53   ` Marco Elver
2020-05-12 18:55     ` Marco Elver
2020-05-12 19:07     ` Peter Zijlstra
2020-05-12 20:31       ` Marco Elver
2020-05-13 11:10         ` Peter Zijlstra
2020-05-13 11:14           ` Peter Zijlstra
2020-05-13 11:48           ` Marco Elver
2020-05-13 12:32             ` Peter Zijlstra
2020-05-13 12:40               ` Will Deacon
2020-05-13 13:15                 ` Marco Elver
2020-05-13 13:24                   ` Peter Zijlstra
2020-05-13 13:58                     ` Marco Elver
2020-05-14 11:21                       ` Peter Zijlstra
2020-05-14 11:24                         ` Peter Zijlstra
2020-05-14 11:35                         ` Peter Zijlstra
2020-05-14 12:01                         ` Will Deacon
2020-05-14 12:27                           ` Peter Zijlstra
2020-05-14 13:07                             ` Marco Elver
2020-05-14 13:14                               ` Peter Zijlstra
2020-05-14 12:20                         ` Peter Zijlstra
2020-05-14 14:13                       ` Peter Zijlstra
2020-05-14 14:20                         ` Marco Elver
2020-05-15  9:20                           ` Peter Zijlstra
2020-05-13 16:50                   ` Will Deacon
2020-05-13 17:32                     ` Marco Elver
2020-05-13 17:47                       ` Will Deacon
2020-05-13 18:54                         ` Marco Elver
2020-05-13 21:25                           ` Will Deacon
2020-05-14  7:31                             ` Marco Elver
2020-05-14 11:05                               ` Will Deacon
2020-05-14 13:35                                 ` Marco Elver
2020-05-14 13:47                                   ` Peter Zijlstra
2020-05-14 13:50                                   ` Peter Zijlstra
2020-05-14 13:56                                   ` Peter Zijlstra
2020-05-14 14:24                                   ` Peter Zijlstra
2020-05-14 15:09                                     ` Thomas Gleixner
2020-05-14 15:29                                       ` Marco Elver
2020-05-14 19:37                                         ` Thomas Gleixner
2020-05-15 13:55                                     ` David Laight
2020-05-15 14:04                                       ` Marco Elver
2020-05-15 14:07                                       ` Peter Zijlstra
2020-05-14 15:38                                   ` Paul E. McKenney
2020-05-22 16:08                                   ` [tip: locking/kcsan] kcsan: Restrict supported compilers tip-bot2 for Marco Elver
2020-06-03 18:52                                 ` [PATCH v5 00/18] Rework READ_ONCE() to improve codegen Borislav Petkov
2020-06-03 19:23                                   ` Marco Elver
2020-06-03 22:05                                     ` Borislav Petkov
2020-06-08 17:32                                     ` Martin Liška
2020-06-08 19:56                                       ` Marco Elver
2020-06-09 11:55                                         ` Martin Liška
2020-06-09 12:36                                           ` Martin Liška
2020-06-09 13:45                                             ` Marco Elver
2020-05-22 16:08                           ` [tip: locking/kcsan] kcsan: Remove 'noinline' from __no_kcsan_or_inline tip-bot2 for Marco Elver
2020-05-13 13:21                 ` [PATCH v5 00/18] Rework READ_ONCE() to improve codegen David Laight
2020-05-13 16:32                   ` Thomas Gleixner
2020-05-12 21:14       ` Will Deacon
2020-05-12 22:00         ` Marco Elver

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