[Linux-cachefs] Kernel BUG at fs/nfs/fscache.h:267

[Daire Byrne <Daire Byrne framestore com>]

Hi,

I'm trying out FS-Cache on a RHEL5.2 server but I get the following when I try to access the cached NFS mountpoint through a samba export. The server mounts another NFS server an then re-exports it via Samba. There were reports of similar crashes in nfs_fscache_release_page on the list in the past but I don't think there was any particular solution/patch offered. Should I abandon the RHEL5 kernel and use the latest patches against a newer kernel? Is this bug likely to have been addressed?

Regards,

Daire

----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at fs/nfs/fscache.h:267
invalid opcode: 0000 [1] SMP
last sysfs file: /devices/pci0000:00/0000:00:03.0/class
CPU 0
Modules linked in: cachefiles cpqci(P) mptctl ipmi_devintf ipmi_si ipmi_msghandler loop nfsd exportfs autofs4 mgc lustre lov mdc lquota osc ksocklnd ptlrpc obdclass lnet lvfs libcfs myri10ge dm_mirror dm_mod sr_mod cdrom sg i2c
_piix4 pata_serverworks i2c_core ata_generic k8_edac k8temp edac_mc serio_raw hwmon ahci sata_nv libata mptscsih mptbase cciss sd_mod scsi_mod ext3 jbd
Pid: 23790, comm: smbd Tainted: P      2.6.18-92.1.6.el5.R10.fscfc #1
RIP: 0010:[<ffffffff801019f7>]  [<ffffffff801019f7>] nfs_fscache_release_page+0x1e/0x5e
RSP: 0018:ffff810143401c98  EFLAGS: 00010246
RAX: ffff81021a056810 RBX: ffff8101015ac6a8 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff810143401c68 RDI: ffff8101015ac6a8
RBP: ffff81021a056700 R08: 0000000000000001 R09: 000000000000000d
R10: ffff81006306c2d8 R11: ffffffff80101a37 R12: ffff81021a056810
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffffffffffff
FS:  00002ab079dc3dc0(0000) GS:ffffffff80449000(0000) knlGS:00000000f7eec6c0
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00002aeb1a733000 CR3: 00000002003b8000 CR4: 00000000000006e0
Process smbd (pid: 23790, threadinfo ffff810143400000, task ffff8100346b2080)
Stack:  0000000000000000 ffff8101015ac6a8 0000000000000000 ffffffff80101a74
 0000000000000000 ffff8101015ac6a8 0000000000000000 ffffffff800ae0b6
 0000000043401d18 0000000000000000 000000000000000e 0000000000000000
Call Trace:
 [<ffffffff80101a74>] nfs_release_page+0x3d/0x4d
 [<ffffffff800ae0b6>] invalidate_inode_pages2_range+0x122/0x21a
 [<ffffffff801040a9>] nfs_revalidate_mapping+0xac/0x1a6
 [<ffffffff80102250>] nfs_file_read+0x45/0x97
 [<ffffffff8000c78e>] do_sync_read+0xc7/0x104
 [<ffffffff800caeb4>] __posix_lock_file_conf+0x376/0x3be
 [<ffffffff800945b7>] autoremove_wake_function+0x0/0x2e
 [<ffffffff800377a5>] fcntl_setlk+0x223/0x253
 [<ffffffff8000b080>] vfs_read+0xaa/0x150
 [<ffffffff80011dde>] sys_pread64+0x50/0x70
 [<ffffffff8002cacf>] sys_fcntl+0x2b1/0x2bd
 [<ffffffff8000b080>] vfs_read+0xaa/0x150
 [<ffffffff80011dde>] sys_pread64+0x50/0x70
 [<ffffffff8002cacf>] sys_fcntl+0x2b1/0x2bd
 [<ffffffff80059116>] system_call+0x7e/0x83


Code: 0f 0b 68 03 23 32 80 c2 0b 01 8b 03 f6 c4 01 74 0d be 08 00
RIP  [<ffffffff801019f7>] nfs_fscache_release_page+0x1e/0x5e
 RSP <ffff810143401c98>
 <0>Kernel panic - not syncing: Fatal exception
 <0>Rebooting in 3 seconds..