Re: [PATCH -v2] rmap: make anon_vma_prepare link in all theanon_vmas of a mergeable VMA
From: Borislav Petkov
Date: Thu Apr 08 2010 - 19:53:16 EST
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, Apr 08, 2010 at 04:16:23PM -0700
> > And this happens quite often - I changed the WARN_ONCE to WARN and can't
> > start kvm, iceowl (mozilla calendar) and the console-kit-daemon craps up
> > upon boot too:
>
> Hmm. I tried console-kit-daemon, which I had installed, but didn't get
> anything like that. Probably some setup difference.
>
> I also went through every user of 'vm_area_cachep', and saw nothing
> suspicious at least for the mmu case (I didn't check the nommu.c code). I
> must have missed something.
>
> One thing you could do is to add some more debugging info when that "no
> anon_vma" warning happens. In particular, if you still have the SLUB
> debugging on, you could try to do that
>
> page = virt_to_head_page(vma);
> object_err(vm_area_cachep, page, (void *)vma, "NULL anon_vma");
>
> and it should give you _which_ routine did the kmem_cache_alloc() for the
> vma that doesn't have an anon_vma.
Yep, looks good: its mmap_region()...
[ 88.237326] ------------[ cut here ]------------
[ 88.237377] WARNING: at mm/memory.c:3110 handle_mm_fault+0x43/0x6ab()
[ 88.237403] Hardware name: System Product Name
[ 88.237428] Mapping with no anon_vma
[ 88.237451] Modules linked in: powernow_k8 cpufreq_ondemand cpufreq_powersave cpufreq_userspace freq_table cpufreq_conservative binfmt_misc kvm_amd kvm ipv6 vfat fat dm_crypt dm_mod 8250_pnp 8250 ohci_hcd edac_core serial_core pcspkr k10temp
[ 88.237938] Pid: 1978, comm: console-kit-dae Not tainted 2.6.34-rc3-00290-g2156db9-dirty #9
[ 88.237980] Call Trace:
[ 88.239269] [<ffffffff81037ec0>] warn_slowpath_common+0x7c/0x94
[ 88.239320] [<ffffffff81037f2f>] warn_slowpath_fmt+0x41/0x43
[ 88.239378] [<ffffffff810b8582>] handle_mm_fault+0x43/0x6ab
[ 88.239440] [<ffffffff8101f3b2>] do_page_fault+0x30b/0x32d
[ 88.239471] [<ffffffff810615e6>] ? put_lock_stats+0xe/0x27
[ 88.239517] [<ffffffff81062a6d>] ? lock_release_holdtime+0x104/0x109
[ 88.239548] [<ffffffff813f9463>] ? error_sti+0x5/0x6
[ 88.239597] [<ffffffff813f7e52>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 88.239626] [<ffffffff813f927f>] page_fault+0x1f/0x30
[ 88.239674] ---[ end trace 42d53170a0d3ccef ]---
[ 88.239699] =============================================================================
[ 88.239750] BUG vm_area_struct: NULL anon_vma
[ 88.239790] -----------------------------------------------------------------------------
[ 88.239794]
[ 88.239805] INFO: Allocated in mmap_region+0x23d/0x500 age=2 cpu=0 pid=1978
[ 88.239815] INFO: Slab 0xffffea0007a0f0e8 objects=17 used=1 fp=0xffff88022dfbb0f0 flags=0x80000000000000c2
[ 88.239823] INFO: Object 0xffff88022dfbb000 @offset=0 fp=0xffff88022dfbb0f0
[ 88.239827]
[ 88.239832] Object 0xffff88022dfbb000: 00 32 53 2b 02 88 ff ff 00 20 ab 29 d1 7f 00 00 .2S+..ÃÃ..Â)Ã...
[ 88.239861] Object 0xffff88022dfbb010: 00 30 ac 29 d1 7f 00 00 e0 81 2b 2c 02 88 ff ff .0Â)Ã...Ã.+,..ÃÃ
[ 88.239886] Object 0xffff88022dfbb020: 25 00 00 00 00 00 00 80 73 00 10 00 00 00 00 00 %.......s.......
[ 88.239910] Object 0xffff88022dfbb030: 10 82 2b 2c 02 88 ff ff 00 00 00 00 00 00 00 00 ..+,..ÃÃ........
[ 88.239966] Object 0xffff88022dfbb040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 88.240016] Object 0xffff88022dfbb050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 88.240077] Object 0xffff88022dfbb060: 00 00 00 00 00 00 00 00 10 a0 1c 2c 02 88 ff ff ...........,..ÃÃ
[ 88.240160] Object 0xffff88022dfbb070: 10 a0 1c 2c 02 88 ff ff 00 00 00 00 00 00 00 00 ...,..ÃÃ........
[ 88.240225] Object 0xffff88022dfbb080: 00 00 00 00 00 00 00 00 b2 9a 12 fd 07 00 00 00 ........Â..Ã....
[ 88.240294] Object 0xffff88022dfbb090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 88.240352] Object 0xffff88022dfbb0a0: 00 00 00 00 00 00 00 00 ........
[ 88.240442] Redzone 0xffff88022dfbb0a8: cc cc cc cc cc cc cc cc ÃÃÃÃÃÃÃÃ
[ 88.240509] Padding 0xffff88022dfbb0e8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
[ 88.240567] Pid: 1978, comm: console-kit-dae Tainted: G W 2.6.34-rc3-00290-g2156db9-dirty #9
[ 88.240578] Call Trace:
[ 88.240593] [<ffffffff810cd802>] print_trailer+0x139/0x142
[ 88.240607] [<ffffffff810cd845>] object_err+0x3a/0x42
[ 88.240617] [<ffffffff810b85e2>] handle_mm_fault+0xa3/0x6ab
[ 88.240641] [<ffffffff8101f3b2>] do_page_fault+0x30b/0x32d
[ 88.240652] [<ffffffff810615e6>] ? put_lock_stats+0xe/0x27
[ 88.240663] [<ffffffff81062a6d>] ? lock_release_holdtime+0x104/0x109
[ 88.240685] [<ffffffff813f9463>] ? error_sti+0x5/0x6
[ 88.240695] [<ffffffff813f7e52>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 88.240707] [<ffffffff813f927f>] page_fault+0x1f/0x30
[ 93.841666] ------------[ cut here ]------------
[ 93.841716] WARNING: at mm/memory.c:3110 handle_mm_fault+0x43/0x6ab()
[ 93.841741] Hardware name: System Product Name
[ 93.841766] Mapping with no anon_vma
[ 93.841793] Modules linked in: powernow_k8 cpufreq_ondemand cpufreq_powersave cpufreq_userspace freq_table cpufreq_conservative binfmt_misc kvm_amd kvm ipv6 vfat fat dm_crypt dm_mod 8250_pnp 8250 ohci_hcd edac_core serial_core pcspkr k10temp
[ 93.842339] Pid: 2050, comm: iceowl-bin Tainted: G W 2.6.34-rc3-00290-g2156db9-dirty #9
[ 93.842383] Call Trace:
[ 93.842424] [<ffffffff81037ec0>] warn_slowpath_common+0x7c/0x94
[ 93.842457] [<ffffffff81037f2f>] warn_slowpath_fmt+0x41/0x43
[ 93.842492] [<ffffffff810b8582>] handle_mm_fault+0x43/0x6ab
[ 93.842527] [<ffffffff8101f3b2>] do_page_fault+0x30b/0x32d
[ 93.842561] [<ffffffff810615e6>] ? put_lock_stats+0xe/0x27
[ 93.842593] [<ffffffff81062a6d>] ? lock_release_holdtime+0x104/0x109
[ 93.842627] [<ffffffff813f9463>] ? error_sti+0x5/0x6
[ 93.842660] [<ffffffff813f7e52>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 93.842694] [<ffffffff813f927f>] page_fault+0x1f/0x30
[ 93.842724] ---[ end trace 42d53170a0d3ccf0 ]---
[ 93.842750] =============================================================================
[ 93.842794] BUG vm_area_struct: NULL anon_vma
[ 93.842822] -----------------------------------------------------------------------------
[ 93.842827]
[ 93.842889] INFO: Allocated in mmap_region+0x23d/0x500 age=1 cpu=2 pid=2050
[ 93.842918] INFO: Slab 0xffffea00079b84b8 objects=17 used=7 fp=0xffff88022c6f1690 flags=0x80000000000000c2
[ 93.842961] INFO: Object 0xffff88022c6f15a0 @offset=1440 fp=0xffff88022c6f1690
[ 93.842965]
[ 93.843005] Bytes b4 0xffff88022c6f1590: 48 d9 fc ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a HÃÃÃ....ZZZZZZZZ
[ 93.843466] Object 0xffff88022c6f15a0: 00 78 b4 2e 02 88 ff ff 00 80 ce 49 5f 7f 00 00 .xÂ...ÃÃ..ÃI_...
[ 93.843877] Object 0xffff88022c6f15b0: 00 90 4e 4a 5f 7f 00 00 c0 13 6f 2c 02 88 ff ff ..NJ_...Ã.o,..ÃÃ
[ 93.844391] Object 0xffff88022c6f15c0: 25 00 00 00 00 00 00 80 73 00 10 00 00 00 00 00 %.......s.......
[ 93.844794] Object 0xffff88022c6f15d0: e0 94 4a 2c 02 88 ff ff 00 00 00 00 00 00 00 00 Ã.J,..ÃÃ........
[ 93.845198] Object 0xffff88022c6f15e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 93.845665] Object 0xffff88022c6f15f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 93.846076] Object 0xffff88022c6f1600: 00 00 00 00 00 00 00 00 30 2d ec 2a 02 88 ff ff ........0-Ã*..ÃÃ
[ 93.846518] Object 0xffff88022c6f1610: 30 2d ec 2a 02 88 ff ff 00 00 00 00 00 00 00 00 0-Ã*..ÃÃ........
[ 93.846931] Object 0xffff88022c6f1620: 00 00 00 00 00 00 00 00 e8 9c f4 f5 07 00 00 00 ........Ã.ÃÃ....
[ 93.847372] Object 0xffff88022c6f1630: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 93.847787] Object 0xffff88022c6f1640: 00 00 00 00 00 00 00 00 ........
[ 93.848194] Redzone 0xffff88022c6f1648: cc cc cc cc cc cc cc cc ÃÃÃÃÃÃÃÃ
[ 93.848635] Padding 0xffff88022c6f1688: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
[ 93.849036] Pid: 2050, comm: iceowl-bin Tainted: G W 2.6.34-rc3-00290-g2156db9-dirty #9
[ 93.849078] Call Trace:
[ 93.849111] [<ffffffff810cd802>] print_trailer+0x139/0x142
[ 93.849142] [<ffffffff810cd845>] object_err+0x3a/0x42
[ 93.849174] [<ffffffff810b85e2>] handle_mm_fault+0xa3/0x6ab
[ 93.849204] [<ffffffff8101f3b2>] do_page_fault+0x30b/0x32d
[ 93.849237] [<ffffffff810615e6>] ? put_lock_stats+0xe/0x27
[ 93.849301] [<ffffffff81062a6d>] ? lock_release_holdtime+0x104/0x109
[ 93.849337] [<ffffffff813f9463>] ? error_sti+0x5/0x6
[ 93.849370] [<ffffffff813f7e52>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 93.849418] [<ffffffff813f927f>] page_fault+0x1f/0x30
--
Regards/Gruss,
Boris.
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