BUG: Bad page map in process

granth · 06-09-2010, 12:37 PM

This is a scary... Kernel bug? Hardware problem?

It repeats 8 times in the kernel log.

Code:

BUG: Bad page map in process sshd  pte:7e7f8080807e7f80 pmd:2be86067
addr:00007f2577800000 vm_flags:08000070 anon_vma:(null) mapping:ffff88007f55cd08 index:f4
vma->vm_ops->fault: filemap_fault+0x0/0x460
vma->vm_file->f_op->mmap: ext4_file_mmap+0x0/0x60 [ext4]
Pid: 7663, comm: sshd Tainted: P           2.6.33.4 #2
Call Trace:
 [<ffffffff810df3e5>] print_bad_pte+0x1a5/0x250
 [<ffffffff810df4ee>] vm_normal_page+0x5e/0x70
 [<ffffffff810e0c94>] unmap_vmas+0x4d4/0x940
 [<ffffffff810e5b3c>] exit_mmap+0xdc/0x180
 [<ffffffff81043db0>] mmput+0x40/0xf0
 [<ffffffff81048824>] exit_mm+0x104/0x130
 [<ffffffff8104a54a>] do_exit+0x12a/0x7a0
 [<ffffffff81026ab7>] ? do_page_fault+0x137/0x2d0
 [<ffffffff8104ac11>] do_group_exit+0x51/0xc0
 [<ffffffff8104ac97>] sys_exit_group+0x17/0x20
 [<ffffffff810028db>] system_call_fastpath+0x16/0x1b

BUG: Bad page map in process sshd pte:7e7f8080807e7f80 pmd:2be86067
BUG: Bad page map in process sshd pte:8482828281807e7e pmd:2be86067
BUG: Bad page map in process sshd pte:8282808082848684 pmd:2be86067
BUG: Bad page map in process sshd pte:7e7e7e7e80818282 pmd:2be86067
BUG: Bad page map in process sshd pte:8080828282828180 pmd:2be86067
BUG: Bad page map in process sshd pte:7e7f808080808080 pmd:2be86067
BUG: Bad page map in process sshd pte:7a7c7b7c7e7e807f pmd:2be86067
BUG: Bad page map in process sshd pte:82848585827f7c7a pmd:2be86067

Has anybody else had this problem, or know anything about this type of BUG?

paulsm4 · 06-09-2010, 01:38 PM

Have you patched your version of sshd recently?

What version is it, anyway?

ALSO:
Run "top" and "vmstat" to check your memory usage. See if there are any "memory hogs"; see if you're hitting swap space. Not necessarily related to the problem at hand - but certainly not a Good Thing, either!

granth · 06-09-2010, 01:48 PM

Running Slackware 13.1 (following -current).

Upgraded sshd on 4/29 (openssh-5.5p1-x86_64-1). This is the first time I've seen the error.

Current, mem usage:

(top)
Mem: 2055688k total, 2010744k used, 44944k free, 150288k buffers
Swap: 2723008k total, 340896k used, 2382112k free, 993232k cached

(vmstat)
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 340896 45440 150304 993232 0 0 33 35 11 3 2 2 95 0