[Linux-cachefs] kernel BUG at fs/fscache/cookie.c:547

[Shantanu Goel]

Hi,

We have fscache deployed on several hosts and recently hit the bug below 
on a couple of hosts.  We searched the mailing lists to see if it had 
been reported but did not find anything similar.  We would appreciate 
any insight you might have into this problem.
We are running the 3.9.11 + fscache-20130702 branch from dhowells git tree as referenced here
https://www.redhat.com/archives/linux-cachefs/2013-July/msg00002.html.


Thanks,
Shantanu Goel

Sep  6 17:22:37 kernel BUG at fs/fscache/cookie.c:547!
Sep  6 17:22:37 invalid opcode: 0000
 [#1] SMP 
Sep 
 6 17:22:37 Modules linked in: fuse cachefiles nfsv3 nfs_acl nfsv4 
auth_rpcgss nfs fscache msr cpufreq_ondemand autofs4 lockd sunrpc 
binfmt_misc nls_iso8859_1 nls_cp437 vfat fat ext3 jbd
 dm_multipath 
scsi_dh raid0 acpi_pad acpi_ipmi ipmi_msghandler acpi_i2c nvram 
kvm_intel kvm sg sr_mod cdrom iTCO_wdt iTCO_vendor_support 
acpi_power_meter bnx2
 hwmon pcspkr lpc_ich ehci_pci m
fd_core i7core_edac i2c_i801 tpm_tis
 tpm acpi_cpufreq freq_table hid_generic i2c_core tpm_bios mperf 
dm_snapshot dm_zero dm_mirror dm_region_hash dm_log dm_mod usb_storage 
ata_piix libata mp
tsas mptscsih mptbase scsi_transport_sas sd_mod 
scsi_mod crc_t10dif raid1 ext4 jbd2 mbcache crc16 uhci_hcd ohci_hcd 
ehci_hcd [last unloaded: microcode]
Sep  6 17:22:37 CPU 4 
Sep  6 17:22:37 Pid: 5875, comm: umount.nfs Not tainted 3.9.11-el5.ia32e.lime.0 #1 Cisco Systems Inc R250-2480805W/R250-2480805W
Sep  6 17:22:37 RIP: 0010:[<ffffffffa041387e>]  [<ffffffffa041387e>] __fscache_cookie_put+0x4e/0x60 [fscache]
Sep  6 17:22:37 RSP: 0018:ffff88011b18fe08  EFLAGS: 00010282
Sep  6 17:22:37 RAX: 0000000000000001 RBX: ffff880906291410 RCX: 00000000ffffffff
Sep  6 17:22:37 RDX: 0000000000000001 RSI: ffff88090d407780 RDI: ffff88090d407780
Sep  6 17:22:37 RBP:
 ffff88011b18fe18 R08: ffff88084fc92a40 R09: 0000000000000080
Sep  6 17:22:37 R10: 0000000000012a40 R11: 0000000000000400 R12: 0000000000000000
Sep  6 17:22:37 R13: ffff88038e6ec400 R14: ffff88038e6ec400 R15: 0000000000000000
Sep  6 17:22:37 FS:  00007f16884346e0(0000) GS:ffff88084fc80000(0000) knlGS:0000000000000000
Sep  6 17:22:37 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Sep  6 17:22:37 CR2: ffffffffff600000 CR3: 0000000d81116000 CR4: 00000000000007e0
Sep  6 17:22:37 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep  6 17:22:37 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Sep  6 17:22:37 Process umount.nfs (pid: 5875, threadinfo ffff88011b18e000, task ffff88013915c830)
Sep  6 17:22:37 Stack:
Sep  6 17:22:37  ffff88090d407780 ffff88090d407780 ffff88011b18fe38 ffffffffa0413dd9
Sep  6 17:22:37 
 ffff880205355800 ffff880205355800 ffff88011b18fe58 ffffffffa043c461
Sep  6 17:22:37  ffff88028f709420 ffff88038e6ec400 ffff88011b18fe78 ffffffffa042f8fd
Sep  6 17:22:37 Call Trace:
Sep  6 17:22:37  [<ffffffffa0413dd9>] __fscache_relinquish_cookie+0x109/0x260 [fscache]
Sep  6 17:22:37  [<ffffffffa043c461>] nfs_fscache_release_super_cookie+0x31/0xb0 [nfs]
Sep  6 17:22:37  [<ffffffffa042f8fd>] nfs_kill_super+0x2d/0x40 [nfs]
Sep  6 17:22:37  [<ffffffff81157345>] deactivate_locked_super+0x45/0x70
Sep  6 17:22:37  [<ffffffff81157fba>] deactivate_super+0x4a/0x70
Sep  6 17:22:37  [<ffffffff81173118>] mntput_no_expire+0xf8/0x150
Sep  6 17:22:37  [<ffffffff8117405f>] sys_umount+0xcf/0x3f0
Sep  6 17:22:37  [<ffffffff8141f3c2>] system_call_fastpath+0x16/0x1b
Sep 
 6 17:22:37 Code: 48 8b
 3d 06 8d 00 00 e8 11 c9 d2 e0 48 85 db 74 13 8b 03 85 c0 7e 18 f0 ff 0b
 0f 94 c0 48 89 de 84 c0 75 d1 48 83 c4 08 5b c9 c3 <0f> 0b eb fe 
0f 0b eb fe 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 
Sep  6 17:22:37 RIP  [<ffffffffa041387e>] __fscache_cookie_put+0x4e/0x60 [fscache]
Sep  6 17:22:37  RSP <ffff88011b18fe08>
Sep  6 17:22:37 ---[ end trace 09b0e943b803d0fb ]---