twa + dump = sbwait

[Kostik Belousov]

On Mon, Sep 17, 2007 at 11:28:58AM +0400, Boris Samorodov wrote:
> Hi!
> 
> 
> I can't use dump at -CURRENT with twa. The process goes to sbwait
> state forever. Here are the details.
> 
> $ uname -a
> FreeBSD test.ipt.ru 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Sat Sep 15 19:37:17 MSD 2007     bsam at test.ipt.ru:/usr/obj/usr/src/sys/TEST  amd64
> 
> The controller:
> twa0: <3ware 9000 series Storage Controller> port 0x3000-0x30ff mem 0xd8000000-0xd9ffffff,0xda300000-0xda300fff irq 16 at device 0.0 on pci8
> twa0: [GIANT-LOCKED]
> twa0: [ITHREAD]
> twa0: INFO: (0x04: 0x0053): Battery capacity test is overdue: 
> twa0: INFO: (0x15: 0x1300): Controller details:: Model 9650SE-8LPML, 8 ports, Firmware FE9X 3.06.00.005, BIOS BE9X 3.06.00.002
> 
> Two disks at stripe:
> da1 at twa0 bus 0 target 1 lun 0
> da1: <AMCC 9650SE-8LP DISK 3.06> Fixed Direct Access SCSI-5 device 
> da1: 100.000MB/s transfers
> da1: 476816MB (976519168 512 byte sectors: 255H 63S/T 60785C)
> 
> Mounted as:
> /dev/da1    /s  ufs rw 2 2
> 
> The command:
> $ dump -0Luan -f s.dump /s
>   DUMP: Date of this level 0 dump: Mon Sep 17 10:26:21 2007
>   DUMP: Date of last level 0 dump: the epoch
>   DUMP: Dumping snapshot of /dev/da1 (/s) to s.dump
>   DUMP: mapping (Pass I) [regular files]
>   DUMP: mapping (Pass II) [directories]
>   DUMP: estimated 432054 tape blocks.
>   DUMP: dumping (Pass III) [directories]
>   DUMP: dumping (Pass IV) [regular files]
> [wait here forever]
> 
> The relevant part of iostat -w 10 and top:
> -----
>       tty             da0              da1             cpu
>  tin tout  KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
>    0  231 16.00   0  0.01  16.00 152  2.37   0  0  1  0 99
>    0  257 16.00   1  0.02  16.00 147  2.29   0  0  1  0 99
>    0  310 16.00   1  0.01  16.00 146  2.28   0  0  1  0 99
>    0  265 16.00   0  0.01  16.00 152  2.38   0  0  1  0 99
>    0  442 16.00   0  0.00  15.98 299  4.66   0  0  1  0 99
>    0  620 15.54   3  0.04   3.46 1999  6.76   0  0  2  1 96
>    0  363 16.00   0  0.01   2.77 5141 13.90   0  0  5  2 93
>    0  309  0.00   0  0.00   3.22 114  0.36   0  0  0  0 100
>    0  260 16.00   1  0.01   0.00   0  0.00   0  0  0  0 100
>    0  263  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
> 
> last pid: 74610;  load averages:  0.01,  0.06,  0.01    up 1+09:53:34  10:32:34
> 98 processes:  98 sleeping
> CPU states:  0.0% user,  0.0% nice,  0.3% system,  0.0% interrupt, 99.6% idle
> Mem: 113M Active, 2374M Inact, 337M Wired, 480K Cache, 214M Buf, 4935M Free
> Swap: 4096M Total, 4096M Free
> 
>   PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
> 74595 duser       1  20    0 28248K 26000K pause  5   0:01  0.00% dump
> 74596 duser       1  20    0 28248K 26000K pause  2   0:01  0.00% dump
> 74594 duser       1  20    0 28248K 26000K pause  5   0:01  0.00% dump
> 74593 duser       1   4    0 28248K 26020K sbwait 7   0:01  0.00% dump
> 74530 duser       1   8    0 28248K 26000K wait   6   0:01  0.00% dump
> 74443 duser       1   8    0  6216K  1904K wait   5   0:00  0.00% sh
> -----
> 
> Gdb shows nothing interesting:
> # gdb dump 74593
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "amd64-marcel-freebsd"...(no debugging symbols found)...
> Attaching to program: /sbin/dump, process 74593
> Reading symbols from /lib/libc.so.7...(no debugging symbols found)...done.
> Loaded symbols for /lib/libc.so.7
> Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols found)...done.
> Loaded symbols for /libexec/ld-elf.so.1
> 0x000000080071b34a in read () from /lib/libc.so.7
> 
> Shall I do some more debugging? Thanks!

Please, verify that you have rev. 1.39 of sys/kern/subr_sleepqueue.c.
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