Hello ,
I applied the DIO patches and built the kernel 2.6.18-rc6
(kernel.org).
And executed Aio-DioStressTest of LTP testsuite( ltp-full-20060822 )
on EXT2, EXT3 and XFS filesystems. For the EXT2 and EXT3 filesystems the
tests went okay. But I got stack trace on XFS filesystem and the machine
went down.
kernel BUG at kernel/workqueue.c:113!
invalid opcode: 0000 [#1]
PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in:
CPU: 2
EIP: 0060:[<c012df03>] Not tainted VLI
EFLAGS: 00010202 (2.6.18-rc6-dio #1)
EIP is at queue_work+0x86/0x90
eax: f7900780 ebx: f790077c ecx: f7900754 edx: 00000002
esi: c5f4f8e0 edi: 00000000 ebp: c5d63ca8 esp: c5d63c94
ds: 007b es: 007b ss: 0068
Process swapper (pid: 0, ti=c5d62000 task=c5d2b030 task.ti=c5d62000)
Stack: f268f180 c5d63cb4 3e39c000 00000000 00010000 c5d63cb0 c02b43a2
c5d63cc8
c02b5e2f f7900754 00000000 3e39c000 f4e90000 c5d63d04 c018e77a
f3235780
3e39c000 00000000 00010000 f2604b20 f268f180 c5d63d04 00010000
3e39c000
Call Trace:
[<c0103cea>] show_stack_log_lvl+0xcc/0xdc
[<c0103f0f>] show_registers+0x1b7/0x22b
[<c0104143>] die+0x139/0x235
[<c01042bd>] do_trap+0x7e/0xb4
[<c01045f3>] do_invalid_op+0xb5/0xbf
[<c0103945>] error_code+0x39/0x40
[<c02b43a2>] xfs_finish_ioend+0x20/0x22
[<c02b5e2f>] xfs_end_io_direct+0x3c/0x68
[<c018e77a>] dio_complete+0xe3/0xfe
[<c018e82d>] dio_bio_end_aio+0x98/0xb1
[<c016e889>] bio_endio+0x4e/0x78
[<c02cdc89>] __end_that_request_first+0xcd/0x416
[<c02ce015>] end_that_request_chunk+0x1f/0x21
[<c0380442>] scsi_end_request+0x2d/0xe8
[<c0380715>] scsi_io_completion+0x10c/0x409
[<c03a986b>] sd_rw_intr+0x188/0x2c6
[<c037b832>] scsi_finish_command+0x4e/0x96
[<c0380f44>] scsi_softirq_done+0xaa/0x10b
[<c02ce073>] blk_done_softirq+0x5c/0x6a
[<c01227a4>] __do_softirq+0x6d/0xe3
[<c0122858>] do_softirq+0x3e/0x40
[<c01228a1>] irq_exit+0x47/0x49
[<c01054ef>] do_IRQ+0x2f/0x5d
[<c0103826>] common_interrupt+0x1a/0x20
[<c0100d84>] cpu_idle+0x9a/0xb0
[<c010e077>] start_secondary+0xeb/0x32c
[<00000000>] 0x0
[<c5d63fb4>] 0xc5d63fb4
Code: ff ff b8 01 00 00 00 e8 87 9a fe ff 89 e0 25 00 e0 ff ff 8b 40 08
a8 08 75 0a 83 c4 08 89 f8 5b 5e 5f 5d c3 e8 2f 0f 3
EIP: [<c012df03>] queue_work+0x86/0x90 SS:ESP 0068:c5d63c94
<0>Kernel panic - not syncing: Fatal exception in interrupt
Also I executed some of the tests from the
http: // developer.osdl. org/daniel/AIO/TESTS/ and it went fine.
For further testing, I am planning to put stress workload on DB2 by
enabling AIO-DIO features of DB2. And for error path testing, I am
contemplating to use kprobe to inject the IO errors.
Will let you know the progress as it happens.
Regards
Veerendra C
LTC-ISL, IBM.
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