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Date: Wed, 10 Oct 2018 10:06:41 +0800
From: kernel test robot <rong.a.chen@...el.com>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: linux-kernel@...r.kernel.org, LKP <lkp@...org>
Subject: [LKP] 4ce5f9c9e7 [ 1.323881] WARNING: CPU: 0 PID: 1 at
mm/slab_common.c:1031 kmalloc_slab
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 4ce5f9c9e7546915c559ffae594e6d73f918db00
Author: Eric W. Biederman <ebiederm@...ssion.com>
AuthorDate: Tue Sep 25 12:59:31 2018 +0200
Commit: Eric W. Biederman <ebiederm@...ssion.com>
CommitDate: Wed Oct 3 16:50:39 2018 +0200
signal: Use a smaller struct siginfo in the kernel
We reserve 128 bytes for struct siginfo but only use about 48 bytes on
64bit and 32 bytes on 32bit. Someday we might use more but it is unlikely
to be anytime soon.
Userspace seems content with just enough bytes of siginfo to implement
sigqueue. Or in the case of checkpoint/restart reinjecting signals
the kernel has sent.
Reducing the stack footprint and the work to copy siginfo around from
2 cachelines to 1 cachelines seems worth doing even if I don't have
benchmarks to show a performance difference.
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
ae7795bc61 signal: Distinguish between kernel_siginfo and siginfo
4ce5f9c9e7 signal: Use a smaller struct siginfo in the kernel
570b7bdeaf Add linux-next specific files for 20181009
+-------------------------------------------+------------+------------+---------------+
| | ae7795bc61 | 4ce5f9c9e7 | next-20181009 |
+-------------------------------------------+------------+------------+---------------+
| boot_successes | 0 | 0 | 28 |
| boot_failures | 1144 | 280 | 8 |
| WARNING:at_mm/slab_common.c:#kmalloc_slab | 1144 | 280 | |
| RIP:kmalloc_slab | 1144 | 280 | |
| Mem-Info | 1144 | 280 | 8 |
| BUG:unable_to_handle_kernel | 0 | 5 | 7 |
| Oops:#[##] | 0 | 7 | 8 |
| RIP:copy_siginfo_from_user | 0 | 7 | |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 7 | 8 |
| RIP:post_copy_siginfo_from_user | 0 | 0 | 8 |
+-------------------------------------------+------------+------------+---------------+
[ 1.320405] test_overflow: ok: (s8)(0 << 7) == 0
[ 1.321071] test_overflow: ok: (s16)(0 << 15) == 0
[ 1.321756] test_overflow: ok: (int)(0 << 31) == 0
[ 1.322442] test_overflow: ok: (s32)(0 << 31) == 0
[ 1.323121] test_overflow: ok: (s64)(0 << 63) == 0
[ 1.323881] WARNING: CPU: 0 PID: 1 at mm/slab_common.c:1031 kmalloc_slab+0x17/0x70
[ 1.324113] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G T 4.19.0-rc1-00077-g4ce5f9c #1
[ 1.324113] RIP: 0010:kmalloc_slab+0x17/0x70
[ 1.324113] Code: 00 00 00 83 3d 11 78 14 03 02 55 48 89 e5 5d 0f 97 c0 c3 55 48 81 ff 00 00 40 00 48 89 e5 76 0e 31 c0 81 e6 00 02 00 00 75 4b <0f> 0b eb 47 48 81 ff c0 00 00 00 77 19 48 85 ff b8 10 00 00 00 74
[ 1.324113] RSP: 0000:ffff88000fc7fd50 EFLAGS: 00010246
[ 1.324113] RAX: 0000000000000000 RBX: 00000000006000c0 RCX: ffff88001fb68d47
[ 1.324113] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffffffffffff
[ 1.324113] RBP: ffff88000fc7fd50 R08: 00000000b128ac78 R09: 0000000000000001
[ 1.324113] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88001d814800
[ 1.324113] R13: 0000000000000000 R14: ffffffff836e16f4 R15: 0000000000000001
[ 1.324113] FS: 0000000000000000(0000) GS:ffff88001f000000(0000) knlGS:0000000000000000
[ 1.324113] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.324113] CR2: 0000000000000000 CR3: 0000000003012001 CR4: 00000000001606b0
[ 1.324113] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1.324113] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1.324113] Call Trace:
[ 1.324113] __kmalloc+0x10/0x130
[ 1.324113] ? test_overflow_calculation+0x152b/0x152b
[ 1.324113] test_module_init+0x1262/0x1dfa
[ 1.324113] ? vprintk_emit+0x29e/0x2b0
[ 1.324113] ? _kstrtoull+0x2c/0x70
[ 1.324113] ? kstrtoll+0x4b/0x70
[ 1.324113] ? kstrtos8+0x15/0x40
[ 1.324113] ? test_overflow_calculation+0x152b/0x152b
[ 1.324113] ? do_early_param+0x92/0x92
[ 1.324113] do_one_initcall+0x65/0x130
[ 1.324113] ? do_early_param+0x92/0x92
[ 1.324113] kernel_init_freeable+0x1b5/0x250
[ 1.324113] ? rest_init+0xf0/0xf0
[ 1.324113] kernel_init+0x9/0xf0
[ 1.324113] ret_from_fork+0x35/0x40
[ 1.324113] _warn_unseeded_randomness: 1 callbacks suppressed
[ 1.324113] random: get_random_bytes called from print_oops_end_marker+0x21/0x50 with crng_init=0
[ 1.324113] ---[ end trace 8ef06e4cef93b260 ]---
[ 1.351969] test_overflow: kmalloc detected saturation
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 570b7bdeaf18a5d66dc76d79d7f1e36cb10b5da0 0238df646e6224016a45505d2c111a24669ebe21 --
git bisect good 073ceed8e5a6c9835a915549d248569067e11268 # 04:27 G 213 0 213 289 Merge remote-tracking branch 'opp/opp/linux-next'
git bisect good fc708c9582d94983c6c908271390c9720ca3ec4c # 04:42 G 216 0 216 293 Merge remote-tracking branch 'mailbox/mailbox-for-next'
git bisect good 8c55f3646e42de506c5832d4ac8bf116ff3cb246 # 04:59 G 211 0 211 288 Merge remote-tracking branch 'char-misc/char-misc-next'
git bisect bad 616b28683e7f382c5dc8fa8ab7837fbd64ed261f # 04:59 B 0 7 93 72 Merge remote-tracking branch 'userns/for-next'
git bisect good 756752870e5af5586fecb5973a50db7f6ab96f91 # 05:23 G 212 0 212 289 Merge remote-tracking branch 'cgroup/for-next'
git bisect good 50473600212c8bbd945d24a5f1fcb60e3e70c607 # 05:54 G 213 0 213 288 Merge remote-tracking branch 'rpmsg/for-next'
git bisect good d112058d6e522116e9ba88c6962c7ce02d2c3d8f # 06:17 G 209 0 209 286 Merge remote-tracking branch 'gpio/for-next'
git bisect good 5ebcede43c9e797b6b3cb412f83fcbff65818ba9 # 06:33 G 215 0 215 294 Merge remote-tracking branch 'pinctrl/for-next'
git bisect good cd60ab7abb3df301c4ff2cf7d619cf7e30cca289 # 06:46 G 210 0 210 289 signal/powerpc: Remove pkey parameter from __bad_area_nosemaphore
git bisect good c852680959d0964198e829da80f012b3df43060c # 06:57 G 208 0 208 285 signal/arm64: Use send_sig_fault where appropriate
git bisect good 5ee527d7cefddebd72970d290e5cc06c9ae32890 # 07:20 G 209 0 209 286 signal/unicore32: Use send_sig_fault where appropriate
git bisect good f28380185193610c716a90ec9b9e696638a495ce # 07:39 G 208 0 208 283 signal: Remove the need for __ARCH_SI_PREABLE_SIZE and SI_PAD_SIZE
git bisect good ae7795bc6187a15ec51cf258abae656a625f9980 # 07:54 G 216 0 216 291 signal: Distinguish between kernel_siginfo and siginfo
git bisect bad 601d5abfeaf244b86bb68c1e05c6e0d57be2f6b0 # 07:54 B 0 5 89 70 signal: In sigqueueinfo prefer sig not si_signo
git bisect bad 4ce5f9c9e7546915c559ffae594e6d73f918db00 # 07:54 B 0 5 294 275 signal: Use a smaller struct siginfo in the kernel
# first bad commit: [4ce5f9c9e7546915c559ffae594e6d73f918db00] signal: Use a smaller struct siginfo in the kernel
git bisect good ae7795bc6187a15ec51cf258abae656a625f9980 # 08:59 G 853 0 853 1144 signal: Distinguish between kernel_siginfo and siginfo
# extra tests with debug options
git bisect bad 4ce5f9c9e7546915c559ffae594e6d73f918db00 # 09:21 B 156 1 156 158 signal: Use a smaller struct siginfo in the kernel
# extra tests on HEAD of linux-next/master
git bisect bad 570b7bdeaf18a5d66dc76d79d7f1e36cb10b5da0 # 09:26 B 21 7 0 1 Add linux-next specific files for 20181009
# extra tests on tree/branch linux-next/master
git bisect bad 570b7bdeaf18a5d66dc76d79d7f1e36cb10b5da0 # 09:27 B 21 7 0 1 Add linux-next specific files for 20181009
---
0-DAY kernel test infrastructure Open Source Technology Center
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