Tetsuo Handa wrote:
> I can hit this bug with Linux 4.11 and 4.8. (i.e. at least all 4.8+ have this bug.)
> So far I haven't hit this bug with Linux 4.8-rc3 and 4.7.
> Does anyone know what is happening?
I simplified the reproducer and succeeded to reproduce this bug with both
i7-2630QM (8 core) and i5-4440S (4 core). Thus, I think that this bug is
not architecture specific.
---------- reproducer start ----------
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
if (argc != 1) {
unsigned long long size;
char *buf = NULL;
unsigned long long i;
for (size = 1048576; size < 512ULL * (1 << 30); size += 1048576) {
char *cp = realloc(buf, size);
if (!cp) {
size -= 1048576;
break;
}
buf = cp;
}
for (i = 0; i < size; i += 4096)
buf[i] = 0;
_exit(0);
} else
while (1)
if (fork() == 0)
execlp(argv[0], argv[0], "", NULL);
return 0;
}
---------- reproducer end ----------
This bug occurs immediately after a process terminated
(not limited to being killed by the OOM-killer).
----------
[ 100.838906] Out of memory: Kill process 891 (a.out) score 14 or sacrifice child
[ 100.841891] Killed process 891 (a.out) total-vm:2099260kB, anon-rss:47312kB, file-rss:8kB, shmem-rss:0kB
[ 100.847395] BUG: Bad page state in process a.out pfn:3e6a9
[ 100.849515] page:f5d19a68 count:0 mapcount:9 mapping:f3d57c8c index:0x0
[ 100.851773] flags: 0x3e010019(locked|uptodate|dirty|mappedtodisk)
[ 100.853950] raw: 3e010019 f3d57c8c 00000000 00000008 00000000 00000100 00000200 00000000
[ 100.856738] raw: 00000000 00000000
[ 100.858510] page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
[ 100.860880] bad because of flags: 0x1(locked)
[ 100.862685] Modules linked in: xfs libcrc32c sr_mod cdrom sd_mod ata_generic pata_acpi serio_raw mptspi scsi_transport_spi mptscsih ata_piix mptbase libata
[ 100.867413] CPU: 0 PID: 919 Comm: a.out Not tainted 4.15.0-rc7+ #196
[ 100.869521] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/19/2017
[ 100.874256] Call Trace:
[ 100.875664] dump_stack+0x58/0x76
[ 100.878332] bad_page+0xc4/0x140
[ 100.879911] free_pages_check_bad+0x5b/0x5e
[ 100.882825] free_unref_page+0x149/0x160
[ 100.884498] __put_page+0x2e/0x40
[ 100.886089] try_to_unmap_one+0x37d/0x590
[ 100.887839] rmap_walk_file+0x13c/0x250
[ 100.890229] rmap_walk+0x32/0x60
[ 100.893452] try_to_unmap+0x4d/0x100
[ 100.895316] ? page_remove_rmap+0x2e0/0x2e0
[ 100.897142] ? page_not_mapped+0x10/0x10
[ 100.898815] ? page_get_anon_vma+0x80/0x80
[ 100.900539] shrink_page_list+0x3a2/0x1000
[ 100.902247] shrink_inactive_list+0x1b2/0x440
[ 100.904431] shrink_node_memcg+0x34a/0x770
[ 100.906126] shrink_node+0xbb/0x2e0
[ 100.910555] do_try_to_free_pages+0xba/0x320
[ 100.913526] try_to_free_pages+0x11d/0x330
[ 100.915234] __alloc_pages_slowpath+0x303/0x6d9
[ 100.916941] ? __accumulate_pelt_segments+0x32/0x50
[ 100.918991] __alloc_pages_nodemask+0x16d/0x180
[ 100.921866] do_anonymous_page+0xab/0x4f0
[ 100.926874] handle_mm_fault+0x531/0x8d0
[ 100.929028] ? __phys_addr+0x32/0x70
[ 100.930829] ? load_new_mm_cr3+0x6a/0x90
[ 100.932898] __do_page_fault+0x1ea/0x4d0
[ 100.939138] ? __do_page_fault+0x4d0/0x4d0
[ 100.944536] do_page_fault+0x1a/0x20
[ 100.948193] common_exception+0x6f/0x76
[ 100.951431] EIP: 0x8048437
[ 100.952710] EFLAGS: 00010202 CPU: 0
[ 100.954576] EAX: 01e7c000 EBX: 7ff00000 ECX: 39d6a008 EDX: 00000000
[ 100.957048] ESI: 7ff00000 EDI: 00000000 EBP: bfc49318 ESP: bfc492e0
[ 100.960794] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 100.965552] Disabling lock debugging due to kernel taint
[ 100.967496] page:f5d19a68 count:0 mapcount:0 mapping:f3d57c8c index:0x0
[ 100.969872] flags: 0x3e030078(uptodate|dirty|lru|active|mappedtodisk|reclaim)
[ 100.976635] raw: 3e030078 f3d57c8c 00000000 ffffffff 00000000 f400f680 f400f680 00000000
[ 100.979529] raw: 00000000 00000000
[ 100.981347] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
[ 100.983838] ------------[ cut here ]------------
[ 100.986268] kernel BUG at ./include/linux/mm.h:483!
[ 100.990886] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 100.993122] Modules linked in: xfs libcrc32c sr_mod cdrom sd_mod ata_generic pata_acpi serio_raw mptspi scsi_transport_spi mptscsih ata_piix mptbase libata
[ 100.997779] CPU: 0 PID: 919 Comm: a.out Tainted: G B 4.15.0-rc7+ #196
[ 101.000477] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/19/2017
[ 101.004621] EIP: put_page_testzero.part.53+0xd/0xf
[ 101.006692] EFLAGS: 00010086 CPU: 0
[ 101.008524] EAX: 00000000 EBX: f400f668 ECX: c19dd988 EDX: 00000086
[ 101.011584] ESI: f5d19a7c EDI: 00000003 EBP: f2e15bcc ESP: f2e15bcc
[ 101.013808] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 101.015759] CR0: 80050033 CR2: 38a1e008 CR3: 3197e000 CR4: 001406d0
[ 101.017934] Call Trace:
[ 101.019235] putback_inactive_pages+0x384/0x3c0
[ 101.021417] shrink_inactive_list+0x205/0x440
[ 101.023592] shrink_node_memcg+0x34a/0x770
[ 101.025453] shrink_node+0xbb/0x2e0
[ 101.027097] do_try_to_free_pages+0xba/0x320
[ 101.028729] try_to_free_pages+0x11d/0x330
[ 101.030419] __alloc_pages_slowpath+0x303/0x6d9
[ 101.032194] ? __accumulate_pelt_segments+0x32/0x50
[ 101.034161] __alloc_pages_nodemask+0x16d/0x180
[ 101.035866] do_anonymous_page+0xab/0x4f0
[ 101.037464] handle_mm_fault+0x531/0x8d0
[ 101.039042] ? __phys_addr+0x32/0x70
[ 101.041023] ? load_new_mm_cr3+0x6a/0x90
[ 101.042784] __do_page_fault+0x1ea/0x4d0
[ 101.044805] ? __do_page_fault+0x4d0/0x4d0
[ 101.046503] do_page_fault+0x1a/0x20
[ 101.048046] common_exception+0x6f/0x76
[ 101.049637] EIP: 0x8048437
[ 101.051098] EFLAGS: 00010202 CPU: 0
[ 101.054732] EAX: 01e7c000 EBX: 7ff00000 ECX: 39d6a008 EDX: 00000000
[ 101.058435] ESI: 7ff00000 EDI: 00000000 EBP: bfc49318 ESP: bfc492e0
[ 101.062077] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 101.064576] Code: 55 ba 24 1a 7f c1 89 e5 e8 b2 2c 01 00 0f 0b 55 ba ec 2f 7f c1 89 e5 e8 a3 2c 01 00 0f 0b 55 ba a8 7b 7d c1 89 e5 e8 94 2c 01 00 <0f> 0b 55 ba b0 2e 7f c1 89 e5 e8 85 2c 01 00 0f 0b 90 90 90 55
[ 101.074916] EIP: put_page_testzero.part.53+0xd/0xf SS:ESP: 0068:f2e15bcc
[ 101.078189] ---[ end trace d34ac0a26b29ce39 ]---
----------
----------
[ 30.998639] Out of memory: Kill process 330 (a.out) score 22 or sacrifice child
[ 31.001106] Killed process 330 (a.out) total-vm:2099260kB, anon-rss:72524kB, file-rss:8kB, shmem-rss:0kB
[ 31.042032] BUG: unable to handle kernel paging request at 3304001a
[ 31.044552] IP: page_remove_rmap+0x14/0x2e0
[ 31.046248] *pde = 00000000
[ 31.047722] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 31.049977] Modules linked in: xfs libcrc32c sr_mod cdrom sd_mod ata_generic pata_acpi serio_raw mptspi scsi_transport_spi mptscsih ata_piix mptbase libata
[ 31.054476] CPU: 0 PID: 474 Comm: a.out Not tainted 4.15.0-rc7+ #196
[ 31.056620] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/19/2017
[ 31.060414] EIP: page_remove_rmap+0x14/0x2e0
[ 31.062110] EFLAGS: 00010202 CPU: 0
[ 31.063896] EAX: 33040016 EBX: f3096c20 ECX: 0000015a EDX: 00000000
[ 31.066797] ESI: 00000159 EDI: f48b92f8 EBP: f10cda9c ESP: f10cda94
[ 31.069081] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 31.071035] CR0: 80050033 CR2: 3304001a CR3: 31100000 CR4: 001406d0
[ 31.073261] Call Trace:
[ 31.074534] try_to_unmap_one+0x20e/0x590
[ 31.076124] rmap_walk_file+0x13c/0x250
[ 31.077652] rmap_walk+0x32/0x60
[ 31.079000] try_to_unmap+0x4d/0x100
[ 31.080381] ? page_remove_rmap+0x2e0/0x2e0
[ 31.082397] ? page_not_mapped+0x10/0x10
[ 31.084272] ? page_get_anon_vma+0x80/0x80
[ 31.085852] shrink_page_list+0x3a2/0x1000
[ 31.087260] shrink_inactive_list+0x1b2/0x440
[ 31.088728] shrink_node_memcg+0x34a/0x770
[ 31.090099] shrink_node+0xbb/0x2e0
[ 31.091376] do_try_to_free_pages+0xba/0x320
[ 31.092908] try_to_free_pages+0x11d/0x330
[ 31.094272] ? __wake_up+0x1a/0x20
[ 31.095515] __alloc_pages_slowpath+0x303/0x6d9
[ 31.097094] ? debug_object_activate+0x126/0x1d0
[ 31.099222] ? ktime_get+0x47/0xf0
[ 31.100605] __alloc_pages_nodemask+0x16d/0x180
[ 31.102142] do_anonymous_page+0xab/0x4f0
[ 31.103546] handle_mm_fault+0x531/0x8d0
[ 31.104844] ? pick_next_task_fair+0xe1/0x490
[ 31.106201] ? irq_exit+0x45/0xb0
[ 31.107822] ? smp_apic_timer_interrupt+0x4b/0x80
[ 31.109289] __do_page_fault+0x1ea/0x4d0
[ 31.110631] ? __do_page_fault+0x4d0/0x4d0
[ 31.112277] do_page_fault+0x1a/0x20
[ 31.113990] common_exception+0x6f/0x76
[ 31.115879] EIP: 0x8048437
[ 31.117195] EFLAGS: 00010202 CPU: 0
[ 31.118702] EAX: 00c4f000 EBX: 7ff00000 ECX: 38acc008 EDX: 00000000
[ 31.120624] ESI: 7ff00000 EDI: 00000000 EBP: bf937a08 ESP: bf9379d0
[ 31.122365] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 31.124045] Code: c4 fe ff ff ba ec 32 7f c1 89 d8 e8 97 e5 fe ff 0f 0b 83 e8 01 eb 8e 55 89 e5 56 53 89 c3 8b 40 14 a8 01 0f 85 be 01 00 00 89 d8 <f6> 40 04 01 74 5e 84 d2 0f 85 9e 00 00 00 3e 83 43 0c ff 78 07
[ 31.129606] EIP: page_remove_rmap+0x14/0x2e0 SS:ESP: 0068:f10cda94
[ 31.131409] CR2: 000000003304001a
[ 31.133754] ---[ end trace bee2e936b4fd74fc ]---
----------
I can hit this bug with CONFIG_SMP=y CONFIG_PREEMPT_NONE=y nosmp init=/bin/bash
but so far I haven't hit this bug with CONFIG_SMP=n .
Config is at http://I-love.SAKURA.ne.jp/tmp/config-4.15-rc7 .
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