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[Linux-cluster] gfs segfault on umount



Nicola Ranaldo reported a segfault in a previous thread:
> [Linux-cluster] gfs/iscsi over 2.6.11 and gfs listener

though there was no follow up on the segfault.  I'm getting the same
segfault when trying to umount the gfs directory.  I'm running the latest
cvs head from the RHEL4 branch on 2.6.9 with preemptible kernel disabled.

GFS: fsid=blade_cluster:cheesefs.1: Joined cluster. Now mounting FS...
GFS: fsid=blade_cluster:cheesefs.1: jid=1: Trying to acquire journal 
lock...
GFS: fsid=blade_cluster:cheesefs.1: jid=1: Looking at journal...
GFS: fsid=blade_cluster:cheesefs.1: jid=1: Done
GFS: fsid=blade_cluster:cheesefs.1: Scanning for log elements...
GFS: fsid=blade_cluster:cheesefs.1: Found 0 unlinked inodes
GFS: fsid=blade_cluster:cheesefs.1: Found quota changes for 0 IDs
GFS: fsid=blade_cluster:cheesefs.1: Done
Unable to handle kernel NULL pointer dereference at virtual address 
00000004
 printing eip:
f8c1da05
*pde = 00000000
Oops: 0000 [#1]
Modules linked in: lock_dlm dlm cman gfs lock_harness dm_mod ipv6 rtc 
pcspkr psmouse sworks_agp agpgart tsdev mousedev joydev evdev usbhid 
ohci_hcd usbcore tg3 qla2300 qla2xxx scsi_transport_fc sg sr_mod sd_mod 
scsi_mod ide_cd cdrom reiserfs isofs ext3 jbd mbcache ide_generic 
via82cxxx trm290 triflex slc90e66 sis5513 siimage serverworks sc1200 
rz1000 piix pdc202xx_old pdc202xx_new opti621 ns87415 hpt366 ide_disk 
hpt34x generic cy82c693 cs5530 cs5520 cmd64x atiixp amd74xx alim15x3 
aec62xx ide_core unix
CPU:    0
EIP:    0060:[<f8c1da05>]    Tainted: GF  VLI
EFLAGS: 00010213   (2.6.9)
EIP is at gfs_ail_start_trans+0x15/0x180 [gfs]
eax: f8bdb5a8   ebx: 00000000   ecx: 00000400   edx: 00000000
esi: f8bc7000   edi: f8bdb5bc   ebp: f667665c   esp: f6747e4c
ds: 007b   es: 007b   ss: 0068
Process umount (pid: 5117, threadinfo=f6746000 task=f650a020)
Stack: f6747ec0 00000282 00000000 f6747ec0 f8bc7000 f66476b0 f6676600 
f8bc7000
       f8bdb5bc f6676600 f8c37945 f8bc7000 f6676600 00000000 f8bdb5a8 
f8bc7000
       f6746000 f6747ec0 f6bc2e00 f8c1f1b1 f8bc7000 00000400 f8bc7000 
00000000
Call Trace:
 [<f8c37945>] gfs_ail_start+0x75/0xc0 [gfs]
 [<f8c1f1b1>] gfs_sync_meta+0x31/0x60 [gfs]
 [<f8c53be3>] gfs_make_fs_ro+0x53/0xb0 [gfs]
 [<f8c49e8b>] gfs_put_super+0x2cb/0x310 [gfs]
 [<c0154f58>] generic_shutdown_super+0xe8/0x100
 [<f8c46f12>] gfs_kill_sb+0x32/0x6e [gfs]
 [<c0154de8>] deactivate_super+0x48/0x70
 [<c0169d5f>] sys_umount+0x3f/0xa0
 [<c01434ce>] do_munmap+0x11e/0x160
 [<c0143560>] sys_munmap+0x50/0x80
 [<c0169dd5>] sys_oldumount+0x15/0x20
 [<c0105f5f>] syscall_call+0x7/0xb
Code: 04 83 c4 08 e9 dd a1 54 c7 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 
57 56 53 83 ec 18 8b 6c 24 30 83 c5 5c 89 f6 8b 5d 04 39 eb <8b> 7b 04 74 
2e 8d b6 00 00 00 00 8b 43 c0 8d 73 c0 89 44 24 14



-dan

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