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 - 17:08:18 EST

From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, Apr 08, 2010 at 07:11:11AM -0700

> [ The patch below also makes it warn once and return SIGBUS for the case
> where there is no anon_vma. I decided I still want to hear about it if
> there might be some path that tries to insert a vma on its own ]

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:

[ 55.814570] ------------[ cut here ]------------
[ 55.814623] WARNING: at mm/memory.c:3110 handle_mm_fault+0x43/0x66a()
[ 55.814648] Hardware name: System Product Name
[ 55.814671] Mapping with no anon_vma
[ 55.814693] 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 edac_core ohci_hcd serial_core k10temp pcspkr
[ 55.815249] Pid: 1936, comm: console-kit-dae Not tainted 2.6.34-rc3-00290-g2156db9-dirty #8
[ 55.815290] Call Trace:
[ 55.815327] [<ffffffff81037ea8>] warn_slowpath_common+0x7c/0x94
[ 55.815362] [<ffffffff81037f17>] warn_slowpath_fmt+0x41/0x43
[ 55.815391] [<ffffffff810b856a>] handle_mm_fault+0x43/0x66a
[ 55.815420] [<ffffffff8101f392>] do_page_fault+0x30b/0x32d
[ 55.815452] [<ffffffff810615ce>] ? put_lock_stats+0xe/0x27
[ 55.815483] [<ffffffff81062a55>] ? lock_release_holdtime+0x104/0x109
[ 55.815518] [<ffffffff813f93e3>] ? error_sti+0x5/0x6
[ 55.815553] [<ffffffff813f7dd2>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 55.815585] [<ffffffff813f91ff>] page_fault+0x1f/0x30
[ 55.815613] ---[ end trace fa59f67cbfeeca44 ]---
[ 60.801651] ------------[ cut here ]------------
[ 60.801672] WARNING: at mm/memory.c:3110 handle_mm_fault+0x43/0x66a()
[ 60.801681] Hardware name: System Product Name
[ 60.801689] Mapping with no anon_vma
[ 60.801702] 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 edac_core ohci_hcd serial_core k10temp pcspkr
[ 60.802156] Pid: 2008, comm: iceowl-bin Tainted: G W 2.6.34-rc3-00290-g2156db9-dirty #8
[ 60.802169] Call Trace:
[ 60.802181] [<ffffffff81037ea8>] warn_slowpath_common+0x7c/0x94
[ 60.802191] [<ffffffff81037f17>] warn_slowpath_fmt+0x41/0x43
[ 60.802203] [<ffffffff810b856a>] handle_mm_fault+0x43/0x66a
[ 60.802213] [<ffffffff8101f392>] do_page_fault+0x30b/0x32d
[ 60.802225] [<ffffffff810615ce>] ? put_lock_stats+0xe/0x27
[ 60.802235] [<ffffffff81062a55>] ? lock_release_holdtime+0x104/0x109
[ 60.802268] [<ffffffff813f93e3>] ? error_sti+0x5/0x6
[ 60.802279] [<ffffffff813f7dd2>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 60.802290] [<ffffffff813f91ff>] page_fault+0x1f/0x30
[ 60.802305] ---[ end trace fa59f67cbfeeca45 ]---
[ 92.123350] ------------[ cut here ]------------
[ 92.123402] WARNING: at kernel/sched.c:3555 add_preempt_count+0x9c/0xcb()
[ 92.123428] Hardware name: System Product Name
[ 92.123451] 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 edac_core ohci_hcd serial_core k10temp pcspkr
[ 92.123902] Pid: 2111, comm: kvm Tainted: G W 2.6.34-rc3-00290-g2156db9-dirty #8
[ 92.123940] Call Trace:
[ 92.123973] [<ffffffff81037ea8>] warn_slowpath_common+0x7c/0x94
[ 92.124002] [<ffffffff81037ed4>] warn_slowpath_null+0x14/0x16
[ 92.124031] [<ffffffff8102d5d8>] add_preempt_count+0x9c/0xcb
[ 92.124061] [<ffffffff813f7ee9>] _raw_spin_lock_nest_lock+0x21/0x7a
[ 92.124090] [<ffffffff810bc079>] ? mm_take_all_locks+0xf9/0x150
[ 92.124118] [<ffffffff810bc079>] mm_take_all_locks+0xf9/0x150
[ 92.124146] [<ffffffff810cc48d>] ? do_mmu_notifier_register+0xd3/0x19d
[ 92.124174] [<ffffffff810cc495>] do_mmu_notifier_register+0xdb/0x19d
[ 92.124202] [<ffffffff810cc57c>] mmu_notifier_register+0x13/0x15
[ 92.124256] [<ffffffffa00c67e3>] kvm_dev_ioctl+0x2c8/0x495 [kvm]
[ 92.124318] [<ffffffff810e24ff>] vfs_ioctl+0x32/0xa6
[ 92.124357] [<ffffffff810e2a91>] do_vfs_ioctl+0x495/0x4db
[ 92.124390] [<ffffffff813f93e3>] ? error_sti+0x5/0x6
[ 92.124425] [<ffffffff813f8fad>] ? retint_swapgs+0xe/0x13
[ 92.124458] [<ffffffff810e2b1e>] sys_ioctl+0x47/0x6a
[ 92.124498] [<ffffffff810021db>] system_call_fastpath+0x16/0x1b
[ 92.124527] ---[ end trace fa59f67cbfeeca46 ]---
[ 92.213834] ------------[ cut here ]------------
[ 92.213888] WARNING: at mm/memory.c:3110 handle_mm_fault+0x43/0x66a()
[ 92.213913] Hardware name: System Product Name
[ 92.213937] Mapping with no anon_vma
[ 92.213959] 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 edac_core ohci_hcd serial_core k10temp pcspkr
[ 92.214529] Pid: 2111, comm: kvm Tainted: G W 2.6.34-rc3-00290-g2156db9-dirty #8
[ 92.214571] Call Trace:
[ 92.214612] [<ffffffff81037ea8>] warn_slowpath_common+0x7c/0x94
[ 92.214647] [<ffffffff81037f17>] warn_slowpath_fmt+0x41/0x43
[ 92.214683] [<ffffffff810b856a>] handle_mm_fault+0x43/0x66a
[ 92.214718] [<ffffffff8101f392>] do_page_fault+0x30b/0x32d
[ 92.214751] [<ffffffff810be3ab>] ? do_mmap_pgoff+0x290/0x2f3
[ 92.214787] [<ffffffff813f93e3>] ? error_sti+0x5/0x6
[ 92.214821] [<ffffffff81062b97>] ? trace_hardirqs_off_caller+0x1f/0xa9
[ 92.214857] [<ffffffff813f7dd2>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 92.214896] [<ffffffff813f91ff>] page_fault+0x1f/0x30
[ 92.214928] ---[ end trace fa59f67cbfeeca47 ]---

--
Regards/Gruss,
Boris.
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