Neil Brown wrote:
> # echo t > /proc/sysrq-trigger
>
> and look at the resulting kernel messages, particularly for the
> unmount process. If they don't make sense to you, post them.
>
>
Tnx for your response. After recompiling the kernel with magic_sysrq
enabled, rebooting, and repeating umount with the reiser4 md device, the
following trace contains a reiser4-entry:
> syslog-ng R running 0 7581 1 7197 (NOTLB)
> umount D C011B591 0 7588 7200 (NOTLB)
> f6643c98 00000000 c1808320 c011b591 f7db5ad0 f4d18c00 003d092a 00000000
> 00000000 f7db5ad0 c1808320 00000000 f4d18c00 003d092a f6b33540 c1808320
> 00000000 f4d18c00 003d092a f6b33540 f6b33668 c1808320 00000000 f6643cfc
> Call Trace:
> [<c011b591>] __wake_up_common+0x41/0x70
> [<c0318346>] io_schedule+0x26/0x30
> [<c01469fb>] sync_page+0x4b/0x60
> [<c03184d5>] __wait_on_bit+0x45/0x70
> [<c01469b0>] sync_page+0x0/0x60
> [<c014726d>] wait_on_page_bit+0xad/0xc0
> [<c0136a30>] wake_bit_function+0x0/0x60
> [<c0136a30>] wake_bit_function+0x0/0x60
> [<c01ac2f9>] jwait_io+0x59/0x80
> [<c01c1763>] update_journal_header+0x83/0xb0
> [<c01c272a>] commit_tx+0xca/0x110
> [<c01c29a1>] reiser4_write_logs+0x141/0x1e0
> [<c01b9d91>] commit_current_atom+0x171/0x2c0
> [<c01baabf>] try_commit_txnh+0x13f/0x1e0
> [<c01bab94>] commit_txnh+0x34/0xd0
> [<c01b91bc>] txn_end+0x2c/0x30
> [<c01b91d0>] txn_restart+0x10/0x30
> [<c01b920a>] txn_restart_current+0x1a/0x20
> [<c01b9f1f>] force_commit_atom+0x3f/0x70
> [<c01ba03a>] txnmgr_force_commit_all+0xea/0x130
> [<c01fcb0e>] release_format40+0x7e/0x150
> [<c01b5ea8>] init_context+0x58/0x80
> [<c01c8b89>] reiser4_put_super+0x89/0xf0
> [<c01857ed>] invalidate_inodes+0x5d/0x80
> [<c0170fb6>] generic_shutdown_super+0x156/0x160
> [<c0171b2d>] kill_block_super+0x2d/0x50
> [<c0170d90>] deactivate_super+0x60/0x80
> [<c0188e1f>] sys_umount+0x3f/0x90
> [<c01171b0>] do_page_fault+0x1c0/0x5a8
> [<c0159bc1>] sys_munmap+0x51/0x80
> [<c0188e87>] sys_oldumount+0x17/0x20
> [<c010306b>] sysenter_past_esp+0x54/0x75
Freely inerpreting this trace, I'd say that the umount causes the
reiser4 filesystem to do an extra commit, and the sync_page seems to be
waiting for IO.
Are there other traces of interrest?
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