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Message-Id: <20220824032115.76008-1-lizhe.67@bytedance.com>
Date: Wed, 24 Aug 2022 11:21:15 +0800
From: lizhe.67@...edance.com
To: oliver.sang@...el.com
Cc: Jason@...c4.com, Pavel.Tatashin@...rosoft.com,
akpm@...ux-foundation.org, cai@....pw, iamjoonsoo.kim@....com,
keescook@...omium.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, lizefan.x@...edance.com,
lizhe.67@...edance.com, lkp@...el.com, lkp@...ts.01.org,
mark-pk.tsai@...iatek.com, mgorman@...hsingularity.net,
mhiramat@...nel.org, mhocko@...nel.org, rostedt@...dmis.org,
vbabka@...e.cz, yang.shi@...aro.org
Subject: Re: [page_ext] a02a0e703b: Kernel_panic-not_syncing:Out_of_memory
On 21 Aug 2022 16:01:32, kernel test robot <oliver.sang@...el.com> wrote:
>Greeting,
>
>FYI, we noticed the following commit (built with gcc-11):
>
>commit: a02a0e703b59a6fdd1b8ae50b47396621a03fc1f ("page_ext: move up page_ext_init() to catch early page allocation if DEFERRED_STRUCT_PAGE_INIT is n")
>https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
>in testcase: boot
>
>on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
>
>caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>+----------------------------------------+------------+------------+
>| | 3be3989b3b | a02a0e703b |
>+----------------------------------------+------------+------------+
>| boot_successes | 70 | 0 |
>| boot_failures | 0 | 66 |
>| Mem-Info | 0 | 66 |
>| Kernel_panic-not_syncing:Out_of_memory | 0 | 66 |
>+----------------------------------------+------------+------------+
>
>
>If you fix the issue, kindly add following tag
>Reported-by: kernel test robot <oliver.sang@...el.com>
>
>
>[ 0.541637][ T0] Memory: 3927672K/4193784K available (11206K kernel code, 4497K rwdata, 3820K rodata, 1008K init, 1332K bss, 266112K reserved, 0K
>cma-reserved, 3432328K highmem)
>[ 0.545125][ T0] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
>[ 0.546120][ T0] swapper: vmalloc error: size 7864320, vm_struct allocation failed, mode:0xdc0(GFP_KERNEL|__GFP_ZERO), nodemask=(null),cpuset=(nul
>l),mems_allowed=0-7
>[ 0.548152][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00121-ga02a0e703b59 #1
>[ 0.549286][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
>[ 0.550662][ T0] Call Trace:
>[ 0.551108][ T0] ? show_stack+0x3d/0x45
>[ 0.551694][ T0] dump_stack_lvl+0x34/0x44
>[ 0.552299][ T0] dump_stack+0xd/0x10
>[ 0.552841][ T0] warn_alloc.cold+0x55/0xaf
>[ 0.553454][ T0] __vmalloc_node_range+0x87/0x140
>[ 0.554139][ T0] vzalloc_node+0x64/0x80
>[ 0.554716][ T0] ? _page_ext_init+0x119/0x1e7
>[ 0.555382][ T0] _page_ext_init+0x119/0x1e7
>[ 0.556010][ T0] start_kernel+0x213/0x49a
>[ 0.556615][ T0] ? early_idt_handler_common+0x44/0x44
>[ 0.557358][ T0] i386_start_kernel+0x48/0x4a
>[ 0.557995][ T0] startup_32_smp+0x161/0x164
>[ 0.558622][ T0] Mem-Info:
>[ 0.559039][ T0] active_anon:0 inactive_anon:0 isolated_anon:0
>[ 0.559039][ T0] active_file:0 inactive_file:0 isolated_file:0
>[ 0.559039][ T0] unevictable:0 dirty:0 writeback:0
>[ 0.559039][ T0] slab_reclaimable:0 slab_unreclaimable:25
>[ 0.559039][ T0] mapped:0 shmem:0 pagetables:0 bounce:0
>[ 0.559039][ T0] kernel_misc_reclaimable:0
>[ 0.559039][ T0] free:981893 free_pcp:0 free_cma:0
>[ 0.564216][ T0] Node 0 active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:0kB pagetables:0kB all_unreclaimable? no
>[ 0.567976][ T0] Node 0 DMA free:15360kB boost:0kB min:0kB low:0kB high:0kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
>[ 0.571575][ T0] lowmem_reserve[]: 0 0 0 0
>[ 0.572172][ T0] Node 0 Normal free:479884kB boost:0kB min:0kB low:0kB high:0kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:745464kB managed:479984kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
>[ 0.575803][ T0] lowmem_reserve[]: 0 0 0 0
>[ 0.576395][ T0] Node 0 HighMem free:3432328kB boost:0kB min:0kB low:0kB high:0kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3432328kB managed:3432328kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
>[ 0.580081][ T0] lowmem_reserve[]: 0 0 0 0
>[ 0.580668][ T0] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15360kB
>[ 0.582377][ T0] Node 0 Normal: 3*4kB (UM) 2*8kB (UM) 1*16kB (U) 1*32kB (M) 1*64kB (M) 2*128kB (UM) 3*256kB (UM) 1*512kB (U) 1*1024kB (U) 3*2048kB (UM) 115*4096kB (M) = 479884kB
>[ 0.584609][ T0] Node 0 HighMem: 0*4kB 1*8kB (M) 0*16kB 0*32kB 0*64kB 1*128kB (M) 1*256kB (M) 1*512kB (M) 1*1024kB (M) 1*2048kB (M) 837*4096kB (M) = 3432328kB
>[ 0.586543][ T0] 0 total pagecache pages
>[ 0.587121][ T0] 0 pages in swap cache
>[ 0.587680][ T0] Free swap = 0kB
>[ 0.588170][ T0] Total swap = 0kB
>[ 0.588664][ T0] 1048446 pages RAM
>[ 0.589165][ T0] 858082 pages HighMem/MovableOnly
>[ 0.589850][ T0] 66528 pages reserved
>[ 0.590394][ T0] 0 pages cma reserved
>[ 0.590947][ T0] page ext allocation failure
>[ 0.591574][ T0] Kernel panic - not syncing: Out of memory
>[ 0.592360][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00121-ga02a0e703b59 #1
>[ 0.593520][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
>[ 0.594937][ T0] Call Trace:
>[ 0.595370][ T0] ? show_stack+0x3d/0x45
>[ 0.595952][ T0] dump_stack_lvl+0x34/0x44
>[ 0.596560][ T0] dump_stack+0xd/0x10
>[ 0.597098][ T0] panic+0xdd/0x251
>[ 0.597602][ T0] _page_ext_init+0x131/0x1e7
>[ 0.598223][ T0] start_kernel+0x213/0x49a
>[ 0.598830][ T0] ? early_idt_handler_common+0x44/0x44
>[ 0.599530][ T0] i386_start_kernel+0x48/0x4a
>[ 0.600152][ T0] startup_32_smp+0x161/0x164
>
>
>
>To reproduce:
>
> # build kernel
> cd linux
> cp config-6.0.0-rc1-00121-ga02a0e703b59 .config
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
> make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
> cd <mod-install-dir>
> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
>
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
>
> # if come across any failure that blocks the test,
> # please remove ~/.lkp and /lkp dir to run from a clean state.
The reaon of this problem is we call page_ext_init() before vmap initialization.
Moving page_ext_init() behind vmalloc_init() will solve this problem. Suggusted
by Michal Hocko <mhocko@...e.com>, I will send another patch using a cmd line
parameter to achieve the idea and solve the oom problem. Thanks for reporting
this bug.
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