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SubjectRe: BUG: unable to handle kernel NULL pointer dereference at 0000000000000500
On 28.12.2012 00:55, David R. Piegdon wrote:
> Hi,
>
> NOTE to everyone debugging this: reproduced quickly with X + firefox +
> youtube (adobe flash plugin)
>
>> Would you be so kind to test the following patch and report results?
>> Apply the patch to the latest mainline.
>
> I've had probably the same problem (dmesg below) and currently am trying
> your patch applied to current mainline (101e5c7470eb7f). so far it looks
> very good. (before: bug after 5-30 minutes, right now 1h and counting)
>

That's good news, except the oops you've attached belongs to another
bug, it seems. :P

People report good results when applying Hillf Danton suggestion to
revert 5a505085f0 and 4fc3f1d66b1. So, if the bug reappears, you could
help testing with the same procedure.

[Cc: linux-mm list]

> thanks!
>
>
> [ 105.164610] ------------[ cut here ]------------
> [ 105.164614] kernel BUG at mm/huge_memory.c:1798!
> [ 105.164617] invalid opcode: 0000 [#1] PREEMPT SMP
> [ 105.164621] Modules linked in: fuse sha256_generic xt_owner xt_LOG xt_limit xt_recent xt_conntrack xt_multiport iptable_mangle xt_DSCP iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack fbcon font bitblit softcursor fb fbdev hwmon_vid btrfs zlib_deflate zlib_inflate xfs libcrc32c snd_usb_audio uvcvideo snd_usbmidi_lib videobuf2_core snd_rawmidi videobuf2_vmalloc videobuf2_memops hid_kensington iTCO_wdt joydev gpio_ich iTCO_vendor_support raid1 fglrx(PO) coretemp kvm_intel kvm skge acpi_cpufreq lpc_ich serio_raw asus_atk0110 snd_hda_codec_hdmi intel_agp snd_hda_intel mperf intel_gtt processor snd_hda_codec sky2 agpgart snd_hwdep [last unloaded: iTCO_wdt]
> [ 105.164672] CPU 1
> [ 105.164677] Pid: 4091, comm: XPCOM CC Tainted: P O 3.8.0-rc1+ #43 System manufacturer System Product Name/P5B-Deluxe
> [ 105.164679] RIP: 0010:[<ffffffff81120fb6>] [<ffffffff81120fb6>] __split_huge_page+0x216/0x240
> [ 105.164688] RSP: 0018:ffff880091511c48 EFLAGS: 00010297
> [ 105.164690] RAX: 0000000000000001 RBX: ffff8800a210c000 RCX: 0000000000000042
> [ 105.164692] RDX: 00000000000000cb RSI: 0000000000000046 RDI: ffffffff81b28a20
> [ 105.164694] RBP: ffff880091511ca8 R08: 000000000000ffff R09: 0000000000000000
> [ 105.164696] R10: 000000000000043d R11: 0000000000000001 R12: ffff8800a2295c60
> [ 105.164698] R13: ffffea00021e0000 R14: 0000000000000000 R15: 00000007f5134600
> [ 105.164701] FS: 00007f514991e700(0000) GS:ffff8800bfc80000(0000) knlGS:0000000000000000
> [ 105.164703] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 105.164705] CR2: 00007f5123bff000 CR3: 000000009531b000 CR4: 00000000000007e0
> [ 105.164707] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 105.164709] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 105.164712] Process XPCOM CC (pid: 4091, threadinfo ffff880091510000, task ffff8800953616b0)
> [ 105.164713] Stack:
> [ 105.164715] ffff880000000000 ffff8800b9c834b0 00007f5134800000 000000008158c4a5
> [ 105.164719] ffff8800a210c064 00007f5134600000 ffff880091511ca8 ffffea00021e0000
> [ 105.164723] ffff8800b9c83480 ffff8800a210c000 ffff88009fdc1d18 ffff8800a210c064
> [ 105.164727] Call Trace:
> [ 105.164732] [<ffffffff81121048>] split_huge_page+0x68/0xb0
> [ 105.164736] [<ffffffff81121d48>] __split_huge_page_pmd+0x1a8/0x220
> [ 105.164740] [<ffffffff810f72f6>] unmap_page_range+0x1b6/0x2d0
> [ 105.164744] [<ffffffff810f746b>] unmap_single_vma+0x5b/0xe0
> [ 105.164747] [<ffffffff810f7e6c>] zap_page_range+0xbc/0x120
> [ 105.164752] [<ffffffff8108f556>] ? futex_wake+0x116/0x130
> [ 105.164756] [<ffffffff8106e396>] ? pick_next_task_fair+0x36/0xb0
> [ 105.164760] [<ffffffff810f4367>] madvise_vma+0xf7/0x140
> [ 105.164764] [<ffffffff810fddc2>] ? find_vma_prev+0x12/0x60
> [ 105.164767] [<ffffffff810f45ed>] sys_madvise+0x23d/0x330
> [ 105.164772] [<ffffffff8158e712>] system_call_fastpath+0x16/0x1b
> [ 105.164774] Code: 48 89 df e8 ed 10 ff ff e9 ab fe ff ff 0f 0b 41 8b 55 18 8b 75 bc ff c2 48 c7 c7 38 0e 7d 81 31 c0 e8 13 9b 46 00 e9 15 ff ff ff <0f> 0b 41 8b 4d 18 89 da ff c1 8b 75 bc 48 c7 c7 58 0e 7d 81 31
> [ 105.164814] RIP [<ffffffff81120fb6>] __split_huge_page+0x216/0x240
> [ 105.164818] RSP <ffff880091511c48>
> [ 105.164823] ---[ end trace 00c060fd7d17a3d4 ]---
>


--
Zlatko


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