[LU-300] Oops in cl_page_put() during execve()/page-fault on a binary mapped from a Lustre-filesystem and executed by a parallel application

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.1.0
• Affects Version/s: Lustre 2.0.0
• Severity: 3
• Assignee: Jinshan Xiong (Inactive)
• Reporter: Sebastien Buisson (Inactive)

Description

Hi,

During parallel applications execution, either mapping their binary or some of their dynamic-libs from Lustre, CEA at Tera-100 frequently encounters Lustre clients crashes with the following sample stack:

=====================================
crash_kexec()
oops_end()
no_context()
__bad_area_nosemaphore()
bad_area()
do_page_fault()
page_fault()
[exception RIP: cl_page_put+29]
vvp_io_fault_fini()
cl_io_fini()
ll_fault()
__do_fault()
hadle_pte_fault()
handle_mm_fault()
do_page_fault()
page_fault()
=====================================

Further crash dump analysis clearly indicates that in vvp_io_fault_fini() routine, io->u.ci_fault.ft_page is found non-NULL and thus passed to cl_page_put(). The problem is this pointer is not a valid address, but a simple integer instead (or maybe a timestamp), whereas we have ci_type == CIT_FAULT.

I add that the customer is running with the fix from LU-122.
This problem is pretty annoying as it disturbs regular cluster production by preventing normal job launch.

Sebastien.

Comments

[Peter Jones]

Thanks Sebastien. In that case I will mark this ticket as resolved for now. The patch has landed on master for almost two weeks now with no observed side-effects and this issue was previously appearing daily at CEA before the patch was applied. If a problem is found with the patch at CEA then the ticket can simply be reopened.

[Sebastien Buisson (Inactive)]

As far as I know, no new occurrence of this bug since last Tuesday. We will have more news from CEA by the end of the week.

Sebastien.

[Peter Jones]

Sebastien

How has this patch fared running in production at CEA?

Thanks

Peter

[Build Master (Inactive)]

Integrated in lustre-master » i686,server,el6,inkernel #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/llite/file.c
• lustre/liblustre/rw.c
• lustre/include/lclient.h
• lustre/llite/llite_mmap.c
• lustre/lclient/glimpse.c
• lustre/lclient/lcommon_misc.c
• lustre/lclient/lcommon_cl.c
• lustre/llite/rw.c

[Build Master (Inactive)]

Integrated in lustre-master » x86_64,server,el6,inkernel #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/liblustre/rw.c
• lustre/include/lclient.h
• lustre/llite/llite_mmap.c
• lustre/llite/file.c
• lustre/lclient/lcommon_misc.c
• lustre/lclient/glimpse.c
• lustre/llite/rw.c
• lustre/lclient/lcommon_cl.c

[Build Master (Inactive)]

Integrated in lustre-master » x86_64,server,el5,ofa #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/include/lclient.h
• lustre/llite/llite_mmap.c
• lustre/lclient/lcommon_cl.c
• lustre/lclient/glimpse.c
• lustre/llite/rw.c
• lustre/llite/file.c
• lustre/liblustre/rw.c
• lustre/lclient/lcommon_misc.c

[Build Master (Inactive)]

Integrated in lustre-master » i686,server,el5,ofa #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/llite/llite_mmap.c
• lustre/liblustre/rw.c
• lustre/llite/file.c
• lustre/lclient/glimpse.c
• lustre/llite/rw.c
• lustre/lclient/lcommon_cl.c
• lustre/include/lclient.h
• lustre/lclient/lcommon_misc.c

[Build Master (Inactive)]

Integrated in lustre-master » i686,server,el5,inkernel #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/lclient/glimpse.c
• lustre/liblustre/rw.c
• lustre/llite/rw.c
• lustre/llite/llite_mmap.c
• lustre/include/lclient.h
• lustre/lclient/lcommon_misc.c
• lustre/lclient/lcommon_cl.c
• lustre/llite/file.c

[Build Master (Inactive)]

Integrated in lustre-master » x86_64,client,ubuntu1004,ofa #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/llite/file.c
• lustre/llite/rw.c
• lustre/llite/llite_mmap.c
• lustre/lclient/lcommon_misc.c
• lustre/lclient/glimpse.c
• lustre/lclient/lcommon_cl.c
• lustre/include/lclient.h
• lustre/liblustre/rw.c

[Build Master (Inactive)]

Integrated in lustre-master » i686,client,el6,inkernel #122
LU-300: Oops in cl_page_put of page fault path

Oleg Drokin : 15ac26cb2fc0b9b4c6c4507d8cdab683b9b40b7e
Files :

• lustre/lclient/lcommon_misc.c
• lustre/llite/file.c
• lustre/lclient/glimpse.c
• lustre/liblustre/rw.c
• lustre/llite/rw.c
• lustre/lclient/lcommon_cl.c
• lustre/include/lclient.h
• lustre/llite/llite_mmap.c