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Re: shutdown umount hangs

To: Steve Lord <lord@xxxxxxx>
Subject: Re: shutdown umount hangs
From: Utz Lehmann <leh@xxxxxxxxxx>
Date: Thu, 5 Apr 2001 17:23:44 +0200
Cc: cattelan@xxxxxxxxxxx, linux-xfs@xxxxxxxxxxx
In-reply-to: <200104051412.f35ECMU25857@xxxxxxxxxxxxxxxxxxxx>; from lord@xxxxxxx on Thu, Apr 05, 2001 at 09:12:22AM -0500
References: <leh@xxxxxxxxxx> <200104051412.f35ECMU25857@xxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Mutt/1.2.5i
Steve Lord [lord@xxxxxxx] wrote:
> 
> OK, you made it a lot further through unmount than before, there are
> two disk I/O's left until you are unmounted from here, and you are
> waiting for one of them to complete - not sure why it is not completing
> yet - previously you were stuck at the start of unmount. Russell changed
> the code in a different direction than we had discussed, I need to go look 
> at what he did. If you have the kdbm_pg module in the kernel when this
> happens can you take the first argument of pagebuf_iowait and run the
> pb command on it? From the stack below that would be:
> 
> kdb> pb 0xcf724180
> 
> Thanks for trying this stuff out for us.
> 
> Steve

here it is:

Entering kdb (current=0xc0358000, pid 0) due to Keyboard Entry
kdb> ps
Task Addr  Pid      Parent   [*] cpu  State Thread     Command
0xc15fe000 00000001 00000000  0  000  stop  0xc15fe260 init
0xc15f0000 00000002 00000001  0  000  stop  0xc15f0260 keventd
0xc15ec000 00000003 00000001  0  000  stop  0xc15ec260 kswapd
0xc15ea000 00000004 00000001  0  000  stop  0xc15ea260 kreclaimd
0xc15e8000 00000005 00000001  0  000  stop  0xc15e8260 bdflush
0xc15e6000 00000006 00000001  0  000  stop  0xc15e6260 kupdated
0xc15c0000 00000007 00000001  0  000  stop  0xc15c0260 scsi_eh_0
0xc157e000 00000008 00000001  0  000  stop  0xc157e260 mdrecoveryd
0xc1572000 00000009 00000001  0  000  stop  0xc1572260 pagebuf_daemon
0xce426000 00001240 00000001  0  000  stop  0xce426260 rc
0xccc9e000 00001628 00001240  0  000  stop  0xccc9e260 S20reboot
0xcf80a000 00001649 00001628  0  000  stop  0xcf80a260 umount
kdb> btp 1649
    EBP       EIP         Function(args)
0xcf80be58 0xc01108ae schedule+0x2de (0xcf7e50c0)
                               kernel .text 0xc0100000 0xc01105d0 0xc0110a10
0xcf80be70 0xc0105a2f __down+0x5f
                               kernel .text 0xc0100000 0xc01059d0 0xc0105a80
           0xc0105b94 __down_failed+0x8 (0xcf7e50c0, 0xc01aa992, 0xcf7e50c0, 
0xcfc95800, 0xcf7e50c0)
                               kernel .text 0xc0100000 0xc0105b8c 0xc0105b98
           0xc0270fe5 stext_lock+0x9cd
                               kernel .text.lock 0xc0270618 0xc0270618 
0xc02717c0
           0xc015cfea pagebuf_iowait+0x2a (0xcf7e50c0, 0xcfc95800, 0xcf7e50c0, 
0xcf7e50c0)
                               kernel .text 0xc0100000 0xc015cfc0 0xc015cff0
           0xc01aa992 xfs_unmountfs_writesb+0x92 (0xcfc95800)
                               kernel .text 0xc0100000 0xc01aa900 0xc01aa9e0
           0xc01aa85a xfs_unmountfs+0x5a (0xcfc95800, 0x3, 0xc03ac360)
                               kernel .text 0xc0100000 0xc01aa800 0xc01aa8b0
           0xc01b2f48 xfs_unmount+0x168 (0xcfc95800, 0x0, 0xc03ac360)
                               kernel .text 0xc0100000 0xc01b2de0 0xc01b2f60
           0xc01bdf1a fs_dounmount+0x5a (0xcfc95800, 0x0, 0x0, 0xc03ac360, 
0xcf7f2dc8)
                               kernel .text 0xc0100000 0xc01bdec0 0xc01bdf40
           0xc01c5288 linvfs_put_super+0x58 (0xcf917e00)
                               kernel .text 0xc0100000 0xc01c5230 0xc01c5300
           0xc0134237 kill_super+0x87 (0xcf917e00, 0x0, 0xc1575f40, 0xffffffff, 
0xcfb7fac0)
more> 
                               kernel .text 0xc0100000 0xc01341b0 0xc01342f0
           0xc0134641 do_umount+0x1c1 (0xc1575f40, 0x0, 0x0)
                               kernel .text 0xc0100000 0xc0134480 0xc0134650
           0xc0134716 sys_umount+0xc6 (0x8052428, 0x0)
                               kernel .text 0xc0100000 0xc0134650 0xc0134750
           0xc013475c sys_oldumount+0xc (0x8052428, 0x804ee27, 0x8052468, 
0x8052429, 0x804ee20)
                               kernel .text 0xc0100000 0xc0134750 0xc0134760
           0xc0106f17 system_call+0x33
                               kernel .text 0xc0100000 0xc0106ee4 0xc0106f1c
kdb> pb 0xcf7e50c0
page_buf_t at 0xcf7e50c0
  pb_flags WRITE MAPPED PARTIAL ASYNC NONE DELWRI SYNC LOCKABLE MEM_ALLOCATED
            FORCEIO
  pb_target 0xcf7f2ac0 pb_hold 1 pb_next 0xceee8f00 pb_prev 0xceee80c0
  pb_file_offset 0x0 pb_buffer_length 0x200 pb_addr 0xcf79c200
  pb_bn 0x0 pb_count_desired 0x200
  pb_io_remaining 0   pb_error 0 pb_mem 0xcfc25cc0
  pb_iodonesema (-1,1) pb_sema (1,0) pincount (0)
pb_fspriv 0xcec4bc10 pb_fspriv2 0x00000000
kdb> reboot


utz

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