Messages in this thread | | | Date | Fri, 4 Sep 2009 09:06:42 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: Reading /proc/kcore causes a BUG() |
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On Thu, 3 Sep 2009 15:14:55 +0300 Pekka Enberg <penberg@cs.helsinki.fi> wrote:
> On Thu, Sep 3, 2009 at 2:34 PM, Nick Craig-Wood<nick@craig-wood.com> wrote: > > Is a fix for this going to make 2.6.31? > > > > To replicate > > > > cat /proc/kcore >/dev/null > > > > See also > > > > http://bugzilla.kernel.org/show_bug.cgi?id=13850 > > > > To get > > > > BUG: unable to handle kernel paging request at eda08000 > > IP: [<c01a0e98>] read_kcore+0x27f/0x341 > > *pdpt = 0000000071809027 > > Oops: 0000 [#1] SMP > > last sysfs file: /sys/class/net/lo/operstate > > > > Pid: 2361, comm: cat Not tainted (2.6.31.git-x1 #1) > > EIP: 0061:[<c01a0e98>] EFLAGS: 00010286 CPU: 1 > > EIP is at read_kcore+0x27f/0x341 > > EAX: c04404fc EBX: 00001000 ECX: 00000400 EDX: eda09000 > > ESI: eda08000 EDI: ec129000 EBP: ec60bf48 ESP: ec60bf10 > > DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0069 > > Process cat (pid: 2361, ti=ec60a000 task=ecf800b0 task.ti=ec60a000) > > Stack: > > 00001000 08051000 00000000 00001000 00000003 eda08000 ec129000 c04404fc > > <0> eda09000 00000000 00001000 ecd39380 fffffffb c01a0c19 ec60bf6c c019a907 > > <0> ec60bf98 00001000 08051000 eccbab00 eccbab00 c019a8af 00001000 ec60bf8c > > Call Trace: > > [<c01a0c19>] ? read_kcore+0x0/0x341 > > [<c019a907>] ? proc_reg_read+0x58/0x6c > > [<c019a8af>] ? proc_reg_read+0x0/0x6c > > [<c016905e>] ? vfs_read+0x87/0x110 > > [<c0169180>] ? sys_read+0x3b/0x60 > > [<c0106a4d>] ? syscall_call+0x7/0xb > > Code: d3 29 f3 89 f8 29 f0 39 d7 0f 46 d8 8d 0c 33 89 4d e8 29 5d ec 8b 45 e4 f6 40 0c 01 75 18 89 d9 c1 e9 02 89 f7 2b 7d dc 03 7d e0 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 8b 55 e4 8b 12 89 55 e4 83 7d > > EIP: [<c01a0e98>] read_kcore+0x27f/0x341 SS:ESP 0069:ec60bf10 > > CR2: 00000000eda08000 > > ---[ end trace 4387f828fd1590eb ]--- > > > > I tried this on the latest git checkout (as of 2009-09-03 11:00 GMT) > > under Xen as a domU. The bugzilla report states it happens on non xen > > machines also. > > > > I know reading /proc/kcore isn't such a good idea, but badly written > > backup scripts are triggering this on our customer's servers :-( > > AFAICT the bug was fixed but I can't seem to find the patches in > Linus' git either. Lets CC Andrew and Hiroyuki-san. >
Ah, it's now tested under mmotm. please wait.
Thanks, -Kame
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