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Message-ID: <CAGXu5jJU6qa4W5kbU1O8p2JZ+ikb_=9RY16ya6tmDp4z8yS4SQ@mail.gmail.com> Date: Tue, 26 Jun 2018 09:48:04 -0700 From: Kees Cook <keescook@...omium.org> To: kernel test robot <lkp@...el.com> Cc: LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org> Subject: Re: [lkp-robot] [bisect done] ca90800a91 [ 1.761734] WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:4061 __alloc_pages_nodemask Hi! On Mon, Jun 25, 2018 at 6:24 PM, kernel test robot <xiaolong.ye@...el.com> wrote: > > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > commit ca90800a91ba723d78ded634d037c1d2df8b54d6 > Author: Kees Cook <keescook@...omium.org> > AuthorDate: Thu May 10 16:40:03 2018 -0700 > Commit: Kees Cook <keescook@...omium.org> > CommitDate: Tue Jun 5 12:16:51 2018 -0700 > > test_overflow: Add memory allocation overflow tests > > Make sure that the memory allocators are behaving as expected in the face > of overflows of multiplied arguments or when using the array_size()-family > helpers. > > Example output of new tests (with the expected __alloc_pages_slowpath > and vmalloc warnings about refusing giant allocations removed): > > [ 93.062076] test_overflow: kmalloc detected saturation > [ 93.062988] test_overflow: kmalloc_node detected saturation > [ 93.063818] test_overflow: kzalloc detected saturation > [ 93.064539] test_overflow: kzalloc_node detected saturation > [ 93.120386] test_overflow: kvmalloc detected saturation > [ 93.143458] test_overflow: kvmalloc_node detected saturation > [ 93.166861] test_overflow: kvzalloc detected saturation > [ 93.189924] test_overflow: kvzalloc_node detected saturation > [ 93.221671] test_overflow: vmalloc detected saturation > [ 93.246326] test_overflow: vmalloc_node detected saturation > [ 93.270260] test_overflow: vzalloc detected saturation > [ 93.293824] test_overflow: vzalloc_node detected saturation > [ 93.294597] test_overflow: devm_kmalloc detected saturation > [ 93.295383] test_overflow: devm_kzalloc detected saturation > [ 93.296217] test_overflow: all tests passed > > Signed-off-by: Kees Cook <keescook@...omium.org> This is the expected output. i.e. the kernel will issue giant WARNs during this test, since the saturation is being tested to correctly refuse to perform tha llocation. -Kees > > 610b15c50e overflow.h: Add allocation size calculation helpers > ca90800a91 test_overflow: Add memory allocation overflow tests > 35773c9381 Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs > 4b373f94fe Add linux-next specific files for 20180615 > +----------------------------------------------------+------------+------------+------------+---------------+ > | | 610b15c50e | ca90800a91 | 35773c9381 | next-20180615 | > +----------------------------------------------------+------------+------------+------------+---------------+ > | boot_successes | 57 | 0 | 0 | 0 | > | boot_failures | 0 | 37 | 19 | 50 | > | WARNING:at_mm/page_alloc.c:#__alloc_pages_nodemask | 0 | 37 | 19 | 50 | > | EIP:__alloc_pages_nodemask | 0 | 37 | 19 | 50 | > | Mem-Info | 0 | 37 | 19 | 50 | > +----------------------------------------------------+------------+------------+------------+---------------+ > > [ 1.756827] test_overflow: s8 : 19 tests > [ 1.757722] test_overflow: u16: 17 tests > [ 1.758673] test_overflow: s16: 17 tests > [ 1.759738] test_overflow: u32: 17 tests > [ 1.760677] test_overflow: s32: 17 tests > [ 1.761734] WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:4061 __alloc_pages_nodemask+0x172/0xa40 > [ 1.764050] Modules linked in: > [ 1.764815] CPU: 0 PID: 1 Comm: swapper Not tainted 4.17.0-rc4-00006-gca90800 #108 > [ 1.765046] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 > [ 1.765046] EIP: __alloc_pages_nodemask+0x172/0xa40 > [ 1.765046] EFLAGS: 00210246 CPU: 0 > [ 1.765046] EAX: 00200140 EBX: 00000000 ECX: 00000000 EDX: c0039e14 > [ 1.765046] ESI: c0039e14 EDI: 00000000 EBP: c0039e5c ESP: c0039dd4 > [ 1.765046] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 > [ 1.765046] CR0: 80050033 CR2: 00000000 CR3: 13ce6000 CR4: 000006b0 > [ 1.765046] Call Trace: > [ 1.765046] kmalloc_order+0x13/0x30 > [ 1.765046] __kmalloc+0x2f/0x140 > [ 1.765046] test_module_init+0x1128/0x1ab0 > [ 1.765046] ? vprintk_emit+0x3a2/0x400 > [ 1.765046] ? vprintk_default+0x12/0x20 > [ 1.765046] ? vprintk_func+0x55/0x60 > [ 1.765046] ? printk+0xe/0x10 > [ 1.765046] ? string_selftest_init+0x2a1/0x2a1 > [ 1.765046] do_one_initcall+0x65/0x148 > [ 1.765046] ? do_early_param+0x75/0x75 > [ 1.765046] kernel_init_freeable+0xdf/0x16a > [ 1.765046] ? rest_init+0xc0/0xc0 > [ 1.765046] kernel_init+0x8/0xe0 > [ 1.765046] ret_from_fork+0x19/0x24 > [ 1.765046] Code: 89 f6 8d bc 27 00 00 00 00 39 5d bc c6 45 cc 00 74 07 89 5d bc 8d 74 26 00 83 7d b0 0a 76 1a 81 e7 00 02 00 00 0f 85 ae 08 00 00 <0f> 0b e9 a7 08 00 00 8d b4 26 00 00 00 00 89 f8 25 00 00 48 00 > [ 1.765046] ---[ end trace ed0d4aa536181e08 ]--- > [ 1.792892] test_overflow: kmalloc detected saturation > > # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD > git bisect start 3e592428c3e9499beb29b6d32c897cefdb78736e 29dcea88779c856c7dc92040a0c01233263101d4 -- > git bisect bad 28433e0629539b932e1e92e034a52d41a99946db # 01:52 B 0 3 17 0 Merge 'linux-review/Bart-Van-Assche/btrfs-Fix-a-C-compliance-issue/20180616-064505' into devel-spot-201806170104 > git bisect bad 0c165328cd075dfd6a7f3a0ebb936f6a6d4e19eb # 02:10 B 0 3 17 0 Merge 'linux-review/Nicholas-Mc-Guire/MIPS-Octeon-assign-bool-true-false-not-1-0/20180616-153047' into devel-spot-201806170104 > git bisect bad 3ef1cb6222d11fa39e73582183e272bf79ce308d # 02:25 B 0 11 40 15 Merge 'rcu/rcu/dev' into devel-spot-201806170104 > git bisect bad c1676433a88101f37352f4e226690ca5e40f0daf # 02:40 B 0 3 31 14 Merge 'l1k/pciehp_runpm_v2' into devel-spot-201806170104 > git bisect good db5af21ace0378d0a63ae0fc047519391d25d58b # 02:50 G 11 0 0 0 0day base guard for 'devel-spot-201806170104' > git bisect bad 3d65675feaa6336996694ae20c49d54aa663237f # 02:55 B 0 1 19 4 Merge 'hch-block/kill-bio_clone_kmalloc' into devel-spot-201806170104 > git bisect bad 1c8c5a9d38f607c0b6fd12c91cbe1a4418762a21 # 03:09 B 0 5 19 0 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next > git bisect good 135c5504a600ff9b06e321694fbcac78a9530cd4 # 03:20 G 11 0 1 1 Merge tag 'drm-next-2018-06-06-1' of git://anongit.freedesktop.org/drm/drm > git bisect good ffbc9197b4721634dc6c0fefa9b31e565fa89cee # 03:26 G 11 0 11 22 wcn36xx: improve debug and error messages for SMD > git bisect good fd129f8941cf2309def29b5c8a23b62faff0c9d0 # 03:38 G 11 0 1 1 Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next > git bisect good d4d5a1cd298e67cb68cca8dc7dd1ea3942cce3ff # 03:48 G 11 0 0 2 Merge tag 'asoc-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus > git bisect good 311da4975894aab7a4bb94aa83f38f052d7ffda4 # 03:54 G 11 0 0 0 Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm > git bisect good d75ae5bdf2353e5c6a1f83da5f6f2d31582f09a3 # 04:08 G 11 0 0 1 Merge tag 'printk-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk > git bisect good 8b5c6a3a49d9ebc7dc288870b9c56c4f946035d8 # 04:14 G 11 0 0 0 Merge tag 'audit-pr-20180605' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit > git bisect good 5eb6eed7e0fe880dc8de8da203cc888716bbf196 # 04:19 G 11 0 0 0 Merge tag 'trace-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace > git bisect bad 285767604576148fc1be7fcd112e4a90eb0d6ad2 # 04:25 B 0 2 19 3 Merge tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux > git bisect bad ca90800a91ba723d78ded634d037c1d2df8b54d6 # 04:35 B 0 3 28 11 test_overflow: Add memory allocation overflow tests > git bisect good 6d3344324b5ae49fc8cb599a2c687e5607ba6e9f # 04:44 G 11 0 0 0 test_overflow: macrofy some more, do more tests for free > git bisect good 610b15c50e86eb1e4b77274fabcaea29ac72d6a8 # 04:49 G 11 0 0 0 overflow.h: Add allocation size calculation helpers > # first bad commit: [ca90800a91ba723d78ded634d037c1d2df8b54d6] test_overflow: Add memory allocation overflow tests > git bisect good 610b15c50e86eb1e4b77274fabcaea29ac72d6a8 # 04:52 G 31 0 0 0 overflow.h: Add allocation size calculation helpers > # extra tests with debug options > git bisect bad ca90800a91ba723d78ded634d037c1d2df8b54d6 # 04:58 B 0 4 20 2 test_overflow: Add memory allocation overflow tests > # extra tests on HEAD of linux-devel/devel-spot-201806170104 > git bisect bad 3e592428c3e9499beb29b6d32c897cefdb78736e # 05:03 B 0 15 32 0 0day head guard for 'devel-spot-201806170104' > # extra tests on tree/branch linus/master > git bisect bad 35773c93817c5f2df264d013978e7551056a063a # 05:12 B 0 1 15 0 Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs > # extra tests on tree/branch linux-next/master > git bisect bad 4b373f94fee5acf2ff4c1efbb3f702060379df1f # 05:25 B 0 4 29 11 Add linux-next specific files for 20180615 > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/lkp Intel Corporation -- Kees Cook Pixel Security
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