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SubjectRe: 2.6.20 kernel hang with USB drive and vfat doing ftruncate
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Kumar Gala <galak@kernel.crashing.org> writes:

>>> I usually run the following twice to get the hang state:
>>>
>>> time ./trunc_test bar 100000000 &
>>> time ./trunc_test baz 100000000 &
>>>
>>> I was wondering if anyone had any suggestions on what to poke at next
>>> to try and figure out what is going on.
>
> So I realized I could use sysrq to provide some more debug
> information. When the system locks up I get the following output
> from 't'
>
> [ 497.499249] usb-storage D 00000000 0 671 5
> 773 670 (L-TLB)
> [ 497.506930] Call Trace:
> [ 497.509372] [C3F35A60] [C00083AC] __switch_to+0x28/0x40
> [ 497.514608] [C3F35A80] [C01F4B78] schedule+0x324/0x6bc
> [ 497.519756] [C3F35AC0] [C01F5D6C] schedule_timeout+0x6c/0xd0
> [ 497.525426] [C3F35B00] [C01F5C9C] io_schedule_timeout+0x30/0x54
> [ 497.531356] [C3F35B20] [C0050DE4] congestion_wait+0x64/0x8c
> [ 497.536941] [C3F35B70] [C004A9F0] throttle_vm_writeout+0x1c/0x84
> [ 497.542958] [C3F35B90] [C004F33C] shrink_zone+0xbb0/0xfe4
> [ 497.548367] [C3F35D40] [C004F8F4] try_to_free_pages+0x184/0x2cc
> [ 497.554298] [C3F35DB0] [C0049AA8] __alloc_pages+0x110/0x2c0
> [ 497.559878] [C3F35E00] [C0060F84] cache_alloc_refill+0x394/0x694
> [ 497.565900] [C3F35E30] [C00614A0] __kmalloc+0xc4/0xcc
> [ 497.570961] [C3F35E40] [C01544D0] usb_alloc_urb+0x1c/0x5c
> [ 497.576371] [C3F35E50] [C015520C] usb_sg_init+0x1a0/0x2f8
> [ 497.581779] [C3F35EA0] [C0167318] usb_stor_bulk_transfer_sg+0x8c/
> 0x138
> [ 497.588317] [C3F35ED0] [C0167960] usb_stor_Bulk_transport+0x140/0x310
> [ 497.594767] [C3F35F00] [C0167DCC] usb_stor_invoke_transport+0x2c/
> 0x344
> [ 497.601303] [C3F35F50] [C0166B2C] usb_stor_transparent_scsi_command
> +0x10/0x20
> [ 497.608449] [C3F35F60] [C0168498] usb_stor_control_thread+0x1f8/0x290
> [ 497.614900] [C3F35FC0] [C0033E48] kthread+0xf4/0x130
> [ 497.619876] [C3F35FF0] [C001093C] kernel_thread+0x44/0x60
> [ 497.625285] sh D 3009C7EC 0 718 1

[...]

> and from 'm'
>
> [ 731.834529] Show Memory
> [ 731.836968] Mem-info:
> [ 731.839234] DMA per-cpu:
> [ 731.841768] CPU 0: Hot: hi: 18, btch: 3 usd: 3 Cold:
> hi: 6, btch: 1 usd: 2
> [ 731.850206] Active:1510 inactive:11309 dirty:7188 writeback:3330
> unstable:0 free:1009 slab:1671 mapped:110 pagetables:19
> [ 731.861075] DMA free:4036kB min:4096kB low:5120kB high:6144kB
> active:6040kB inactive:45236kB present:65024kB pages_scanned:292
> all_unreclaimable? no
> [ 731.874363] lowmem_reserve[]: 0 0
> [ 731.877685] DMA: 1*4kB 0*8kB 0*16kB 0*32kB 1*64kB 1*128kB 1*256kB
> 1*512kB 1*1024kB 1*2048kB 0*4096kB = 4036kB
> [ 731.887669] Free swap: 0kB
> [ 731.893913] 16384 pages of RAM
> [ 731.896963] 798 reserved pages
> [ 731.900011] 10946 pages shared
> [ 731.903058] 0 pages swap cached
>
> It seems like usb-storage and aio are completely off in the weeds.
> Ideas?

It seems usb-storage should remove some kmalloc and use mempool() for
urb... Is someone working on this? And idea?
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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