[f2fs-dev] Kernel BUG when writing to f2fs drive, PowerPC, SD card, USB3

[Oded Gabbay <ogabbay@advaoptical.com>]

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Hi,

I'm working on a custom board with a PowerPC processor (Freescale P2020).
On the board there is an SD card, which is connected to a USB3 chip 
(from TI), which is connected to the PCI-e controller of the CPU.
I'm running with Linux kernel 3.9.6, with our custom rootFS.

I formatted an SD card using the mkfs.f2fs utility (after fixing some 
Big-endian issues - sent a patch a few days ago).
I then mounted the SD card, using "mount -o 
noatime,nodiratime,rw,nosuid,nodev,relatime,active_logs=6,uhelper=udisks2,background_gc_off 
/dev/sda /mnt/sd1"
Then, I started a small user-space test application which opens a file 
on the mount folder and starts to do "fwrite" into the file.
After 2-3 seconds, the kernel gives me a BUG and the system restarts.
When the system is up and I try to re-mount the SD card, I get the 
following error message:

F2FS-fs (sda): Failed to get valid F2FS checkpoint
mount: you must specify the filesystem type

Only way is to re-format the card using mkfs.f2fs

I took the f2fs patch that Jaegeuk Kim sent to Linus for 3.10 (here - 
https://lkml.org/lkml/2013/5/8/122) and applied it cleanly to 3.9.6
I repeated the procedure but got the same result.

The BUG is from this line, from segment.c:
         if (!f2fs_clear_bit(offset, se->cur_valid_map))
             BUG();

Additional information I can give is

1. I tried using F2FS in ArchLinux, kernel 3.9.5, on an x86 machine, 
with the same SD card and the same USB3-to-PCIe chip and it worked 
flawlessly there.
2. I can work with other FS on the SD card on our custom board, such as 
Ext3, Ext4 and vfat, so this is not a H/W issue.

Could you please try to help me pinpoint/debug the problem ?

Here is the complete kernel BUG print:

kernel BUG at .../linux-3.9.6-adva/fs/f2fs/segment.c:214!
Oops: Exception in kernel mode, sig: 5 [#1]
PREEMPT SMP NR_CPUS=2 P2020 FSP150
Modules linked in: mdio(O) hardware_version(PO) clipresent(PO) 
monotonic(O) restartcause(PO) panic_buffer(O)
NIP: c026a7e0 LR: c026a660 CTR: 00000000
REGS: ee761a60 TRAP: 0700   Tainted: P           O 
(3.9.6-dev_ogabbay-109482*)
MSR: 00029000 <CE,EE,ME>  CR: 24a52588  XER: 20000000
TASK = efb444c0[1755] 'flush-8:0' THREAD: ee760000 CPU: 1
GPR00: 00000000 ee761b10 efb444c0 0000004c 00000000 00000000 01dc4900 
eb0fa700
GPR08: 00000000 eb24cb00 00000040 00000040 00000038 00000000 ee761c64 
00000000
GPR16: c0aeea80 00080000 00000000 00000000 0000ed31 eb0fa700 00000000 
eb0fa734
GPR24: eb0fa700 00000080 f2030620 ffffffff ffffffc8 0000ed31 ffffffff 
c55a1000
NIP [c026a7e0] update_sit_entry+0x240/0x248
LR [c026a660] update_sit_entry+0xc0/0x248
Call Trace:
[ee761b10] [c55a1000] 0xc55a1000 (unreliable)
[ee761b40] [c026d1f4] do_write_page+0x198/0x660
[ee761b80] [c026d84c] write_data_page+0xa4/0xb8
[ee761bc0] [c0265118] do_write_data_page+0x1e8/0x20c
[ee761c20] [c02653dc] f2fs_write_data_page+0x2a0/0x2c0
[ee761c40] [c0263ad8] __f2fs_writepage+0x24/0x80
[ee761c50] [c00b05dc] write_cache_pages+0x1d0/0x35c
[ee761d00] [c0263cf4] f2fs_write_data_pages+0xf4/0xfc
[ee761d30] [c00b1d3c] do_writepages+0x30/0x64
[ee761d40] [c0103fbc] __writeback_single_inode+0x34/0x10c
[ee761d60] [c0104ef8] writeback_sb_inodes+0x204/0x370
[ee761dd0] [c01050f4] __writeback_inodes_wb+0x90/0xd4
[ee761e00] [c01054cc] wb_writeback+0x204/0x20c
[ee761e50] [c0105844] wb_do_writeback+0x144/0x20c
[ee761eb0] [c0105980] bdi_writeback_thread+0x74/0x144
[ee761ee0] [c0059dc4] kthread+0xa8/0xac
[ee761f40] [c000f014] ret_from_kernel_thread+0x64/0x6c
Instruction dump:
4bffff2c 813a0004 5720e8fe 7f39c8f8 39400001 5739077e 7d6900ae 7d59c830
7d6ac878 7d68c839 7d4901ae 4082fef0 <0fe00000> 0fe00000 9421ffe0 7c0802a6

-- 
Best regards,
Oded Gabbay
Principal Engineer Advanced Packet Technologies
ADVA Optical Networking Israel Ltd.
P.O. Box 2552
2 Hatidhar St.
Raanana 4366504, Israel
Tel: +(972)-9-7750130
Fax: +(972)-9-7462092
Mobile: +(972)-54-6543998
E-mail: ogabbay@advaoptical.com <%5C%22mailto:ogabbay@advaoptical.com%5C%22>
www.advaoptical.com <%5C%22http://www.advaoptical.com%5C%22>
*Let's ADVANCE*
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