[#3992] executing FDPIC ELF on NFS mount triggers BUG() at mm/nommu.c:862:/do_mmap_private()

Submitted By: Mike Frysinger

Open Date

2008-03-27 17:29:56 Close Date

2008-04-01 17:05:23

Priority:

Medium Assignee:

Bryan Wu

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

2008R1 / svn 4492

Category:

N/A Board:

N/A

Processor:

ALL Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

App binary format:

N/A

Summary: executing FDPIC ELF on NFS mount triggers BUG() at mm/nommu.c:862:/do_mmap_private()

Details:

platform shouldnt matter ... this has been observed on BF537-STAMP and BF548-EZKIT

if you mount a nfs share and then execute a FDPIC ELF binary on it, you trigger a BUG() in nommu.c

for example:

root:/> mount -t nfs 192.168.0.2:/usr/local/src/blackfin/svn/uclinux-dist/trunk/

romfs -o nolock,nfsvers=3,tcp /mnt/

root:/> cd /mnt/root/

root:/mnt/root> ls

fdpic flat.gdb uclinux-config.gz

flat test.c

root:/mnt/root> cat test.c

#include <stdio.h>

int main(){printf("HI\n");}

root:/mnt/root> ./flat

root:/mnt/root> ./fdpic

Hardware Trace:

0 Target : <0x00004260> { _dump_bfin_trace_buffer + 0x0 }

Source : <0x00036ef8> { _do_mmap_pgoff + 0x59c }

1 Target : <0x00036ef0> { _do_mmap_pgoff + 0x594 }

Source : <0x00404582> { :nfs:_nfs_instantiate + 0x902 }

2 Target : <0x0040457a> { :nfs:_nfs_instantiate + 0x8fa }

Source : <0x0004af7e> { _touch_atime + 0xba }

3 Target : <0x0004af78> { _touch_atime + 0xb4 }

Source : <0x0004aed6> { _touch_atime + 0x12 }

4 Target : <0x0004aec4> { _touch_atime + 0x0 }

Source : <0x00404578> { :nfs:_nfs_instantiate + 0x8f8 }

5 Target : <0x0040456c> { :nfs:_nfs_instantiate + 0x8ec }

Source : <0x00404560> { :nfs:_nfs_instantiate + 0x8e0 }

6 Target : <0x00404544> { :nfs:_nfs_instantiate + 0x8c4 }

Source : <0x004063de> { :nfs:_nfs_revalidate_mapping + 0x56 }

7 Target : <0x004063ce> { :nfs:_nfs_revalidate_mapping + 0x46 }

Source : <0x00406422> { :nfs:_nfs_revalidate_mapping + 0x9a }

8 Target : <0x00406418> { :nfs:_nfs_revalidate_mapping + 0x90 }

Source : <0x004063ae> { :nfs:_nfs_revalidate_mapping + 0x26 }

9 Target : <0x004063ac> { :nfs:_nfs_revalidate_mapping + 0x24 }

Source : <0x00404c5c> { :nfs:_nfs_attribute_timeout + 0x2c }

10 Target : <0x00404c30> { :nfs:_nfs_attribute_timeout + 0x0 }

Source : <0x004063aa> { :nfs:_nfs_revalidate_mapping + 0x22 }

11 Target : <0x00406388> { :nfs:_nfs_revalidate_mapping + 0x0 }

Source : <0x00404542> { :nfs:_nfs_instantiate + 0x8c2 }

12 Target : <0x00404518> { :nfs:_nfs_instantiate + 0x898 }

Source : <0x00036eee> { _do_mmap_pgoff + 0x592 }

13 Target : <0x00036e8a> { _do_mmap_pgoff + 0x52e }

Source : <0x00036d28> { _do_mmap_pgoff + 0x3cc }

14 Target : <0x00036d24> { _do_mmap_pgoff + 0x3c8 }

Source : <0x00037dd2> { _kmem_cache_alloc + 0x4a }

15 Target : <0x00037dca> { _kmem_cache_alloc + 0x42 }

Source : <0x00037de4> { _kmem_cache_alloc + 0x5c }

BUG: failure at mm/nommu.c:862/do_mmap_private()!

Kernel panic - not syncing: BUG!

Follow-ups

--- Bryan Wu 2008-04-01 07:51:05

It it because there is no NOMMU version of mmap function in NFS code.

Normally it should be generic_file_mmap() which has both MMU version and NOMMU

version.

So it should be fixed in the trunk and branch, I will pass this fix to LKML for

review.

Thanks

-Bryan

--- Mike Frysinger 2008-04-01 17:05:23

yep, works for me now, thanks

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[#3992] executing FDPIC ELF on NFS mount triggers BUG() at mm/nommu.c:862:/do_mmap_private()