Messages in this thread | | | Date | Thu, 3 Sep 2009 15:14:55 +0300 | Subject | Re: Reading /proc/kcore causes a BUG() | From | Pekka Enberg <> |
| |
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.
Pekka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |