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List:       linux-kernel
Subject:    [BUG] kernel BUG at linux-2.6.7-bk20.src/mm/rmap.c:407!
From:       Denis Vlasenko <vda () port ! imtp ! ilyichevsk ! odessa ! ua>
Date:       2004-07-31 23:20:17
Message-ID: 200408010220.17416.vda () port ! imtp ! ilyichevsk ! odessa ! ua
[Download RAW message or body]

Hi folks,

One of my supervise processes was nuked,
out of the blue. No more ill effects on the system.

void page_remove_rmap(struct page *page)
{
        BUG_ON(PageReserved(page));
        BUG_ON(!page->mapcount);   <==================== line 407

        page_map_lock(page);
        page->mapcount--;
        if (!page->mapcount) {
                if (page_test_and_clear_dirty(page))
                        set_page_dirty(page);
                if (PageAnon(page))
                        clear_page_anon(page);
                dec_page_state(nr_mapped);
        }
        page_map_unlock(page);
}

------------[ cut here ]------------
kernel BUG at /.1/usr/srcdevel/kernel/linux-2.6.7-bk20.src/mm/rmap.c:407!
invalid operand: 0000 [#1]
Modules linked in: snd_pcm_oss iptable_mangle snd_mixer_oss iptable_filter \
                snd_via82xx snd_pcm snd_timer snd_ac97_codec snd_page_alloc snd_mpu
CPU:    0
EIP:    0060:[<c013846b>]    Not tainted
EFLAGS: 00010246   (2.6.7-bk20)
EIP is at page_remove_rmap+0x4e/0x62
eax: 00000000   ebx: 0000a000   ecx: 00000000   edx: c10001e0
esi: ceee0028   edi: c10001e0   ebp: ced18dc8   esp: ced18dc8
ds: 007b   es: 007b   ss: 0068
Process supervise (pid: 394, threadinfo=ced18000 task=ced11160)
Stack: ced18de4 c01335f6 c10001e0 0000f71b 40400000 cf6b7400 40012000 ced18e14
       c0133730 c0654204 cf6b7400 40000000 00012000 00000000 00000000 c0654204
       40000000 cf6b7400 40012000 ced18e3c c0133786 c0654204 cf6b7400 40000000
Call Trace:
 [<c0105cc6>] show_stack+0x71/0x86
 [<c0105e0f>] show_registers+0x119/0x165
 [<c0105f34>] die+0x50/0xa8
 [<c010623b>] do_invalid_op+0x94/0x96
 [<c010594d>] error_code+0x2d/0x40
 [<c01335f6>] zap_pte_range+0x122/0x215
 [<c0133730>] zap_pmd_range+0x47/0x69
 [<c0133786>] unmap_page_range+0x34/0x60
 [<c01338a1>] unmap_vmas+0xef/0x1c5
 [<c0136d8a>] exit_mmap+0x64/0x122
 [<c01125ec>] mmput+0x47/0x5f
 [<c0115dae>] do_exit+0xdf/0x337
 [<c011607c>] do_group_exit+0x2b/0x68
 [<c011c67c>] get_signal_to_deliver+0x200/0x2b6
 [<c0105423>] do_signal+0x49/0xc0
 [<c01054d3>] do_notify_resume+0x39/0x46
 [<c01056be>] work_notifysig+0x13/0x15
Code: 0f 0b 97 01 a0 d0 42 c0 eb bc 0f 0b 96 01 a0 d0 42 c0 eb ab
--
vda

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