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SubjectRe: [mm/debug_vm_pgtable/locks] e2aad6f1d2: BUG:unable_to_handle_page_fault_for_address
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Date
On 9/21/20 2:51 PM, kernel test robot wrote:
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: e2aad6f1d232b457ea6a3194992dd4c0a83534a5 ("mm/debug_vm_pgtable/locks: take correct page table lock")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
>
> in testcase: trinity
> version: trinity-i386
> with following parameters:
>
> runtime: 300s
>
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
>
>
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +----------------------------------------------------------------------+------------+------------+
> | | c50eb1ed65 | e2aad6f1d2 |
> +----------------------------------------------------------------------+------------+------------+
> | boot_successes | 0 | 0 |
> | boot_failures | 61 | 17 |
> | BUG:workqueue_lockup-pool | 1 | |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/page_alloc.c | 60 | 17 |
> | BUG:unable_to_handle_page_fault_for_address | 0 | 17 |
> | Oops:#[##] | 0 | 17 |
> | EIP:ptep_get | 0 | 17 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 17 |
> +----------------------------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@intel.com>
>
>
> [ 28.726464] BUG: sleeping function called from invalid context at mm/page_alloc.c:4822
> [ 28.727835] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper
> [ 28.729221] no locks held by swapper/1.
> [ 28.729954] CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.0-rc3-00324-ge2aad6f1d232b4 #1
> [ 28.731484] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> [ 28.732891] Call Trace:
> [ 28.733295] ? show_stack+0x48/0x50
> [ 28.733943] dump_stack+0x1b/0x1d
> [ 28.734569] ___might_sleep+0x205/0x219
> [ 28.735292] __might_sleep+0x106/0x10f
> [ 28.736022] __alloc_pages_nodemask+0xe0/0x2c8
> [ 28.736845] swap_migration_tests+0x62/0x295
> [ 28.737639] debug_vm_pgtable+0x587/0x9b5
> [ 28.738374] ? pte_advanced_tests+0x267/0x267
> [ 28.739318] do_one_initcall+0x129/0x31c
> [ 28.740023] ? rcu_read_lock_sched_held+0x46/0x74
> [ 28.740944] kernel_init_freeable+0x201/0x250
> [ 28.741763] ? rest_init+0xf8/0xf8
> [ 28.742401] kernel_init+0xe/0x15d
> [ 28.743040] ? rest_init+0xf8/0xf8
> [ 28.743694] ret_from_fork+0x1c/0x30


This should be fixed by
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/mm/debug_vm_pgtable.c?id=3a4f9a45eadb6ed5fc04686e8db4dc7bb1caec44

> [ 28.744364] BUG: unable to handle page fault for address: fffbbea4
> [ 28.745465] #PF: supervisor read access in kernel mode
> [ 28.746373] #PF: error_code(0x0000) - not-present page
> [ 28.747275] *pde = 0492b067 *pte = 00000000
> [ 28.748054] Oops: 0000 [#1]
> [ 28.748548] CPU: 0 PID: 1 Comm: swapper Tainted: G W 5.9.0-rc3-00324-ge2aad6f1d232b4 #1
> [ 28.750188] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> [ 28.751641] EIP: ptep_get+0x0/0x3
> [ 28.752226] Code: 5d fc c9 c3 55 c1 e8 1a 89 e5 53 31 db 83 f8 1f 6a 00 0f 94 c3 b8 80 67 02 c4 31 c9 89 da e8 16 5c f1 ff 89 d8 8b 5d fc c9 c3 <8b> 00 c3 55 31 c9 89 e5 57 56 53 8b 70 04 89 c3 b8 10 68 02 c4 6a
> [ 28.755465] EAX: fffbbea4 EBX: fffbbea4 ECX: 000047bd EDX: fffbbea4
> [ 28.756418] ESI: 000047bd EDI: 00000025 EBP: f406bed8 ESP: f406bebc
> [ 28.757522] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010286
> [ 28.758739] CR0: 80050033 CR2: fffbbea4 CR3: 04928000 CR4: 000406d0
> [ 28.759828] Call Trace:
> [ 28.760235] ? hugetlb_advanced_tests+0x2a/0x27f
> [ 28.761099] ? do_raw_spin_unlock+0xd7/0x112
> [ 28.761872] debug_vm_pgtable+0x927/0x9b5
> [ 28.762578] ? pte_advanced_tests+0x267/0x267
> [ 28.763462] do_one_initcall+0x129/0x31c
> [ 28.764134] ? rcu_read_lock_sched_held+0x46/0x74
> [ 28.764948] kernel_init_freeable+0x201/0x250
> [ 28.765654] ? rest_init+0xf8/0xf8
> [ 28.766277] kernel_init+0xe/0x15d
> [ 28.766878] ? rest_init+0xf8/0xf8
> [ 28.767488] ret_from_fork+0x1c/0x30
> [ 28.768052] Modules linked in:
> [ 28.768532] CR2: 00000000fffbbea4
> [ 28.769065] ---[ end trace 9c4395cf49c7b3e7 ]---
>

IIUC, Anshuman is reworking the test to follow the page table update rules.

>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.9.0-rc3-00324-ge2aad6f1d232b4 .config
> make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
> Thanks,
> Rong Chen
>


-aneesh

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