Re: [PATCH RT] fix migrating softirq [cause of network hang]

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On 6/14/07, Shane <gnome42@xxxxxxxxx> wrote:
Sorry, that one was incomplete. Full sysrq-T is attached.

I don't know if it helps but here is a 'ls' hung accessing that nfs mount.

ls            S [ec39d6f0] 0000027D     0  4306   4289 (NOTLB)
      d2b47d18 00200086 f7cec50f 0000027d d2b47d00 00000000 00000000 0065b7f4
      00000000 f7cec407 0000027d 00000000 ec39d87c b011e290 ec39d6f0 b180d480
      00000000 f6e5508a 00000648 0065b7f4 00000000 94950179 00000649 f7cec50f
Call Trace:
[<b011e290>] put_prev_task_fair+0x0/0x480
[<b0142216>] rt_down+0x16/0x40
[<b034dab2>] __reacquire_kernel_lock+0x22/0x30
[<b034bcbf>] schedule+0x2f/0x110
[<b01360ac>] prepare_to_wait+0x1c/0x60
[<f0b69fda>] rpc_wait_bit_interruptible+0x1a/0x20 [sunrpc]
[<b034c7c2>] __wait_on_bit+0x42/0x70
[<f0b69fc0>] rpc_wait_bit_interruptible+0x0/0x20 [sunrpc]
[<b0135f60>] wake_bit_function+0x0/0x60
[<f0b69fc0>] rpc_wait_bit_interruptible+0x0/0x20 [sunrpc]
[<b034c862>] out_of_line_wait_on_bit+0x72/0x90
[<b0135f60>] wake_bit_function+0x0/0x60
[<f0b6a5b1>] __rpc_execute+0xb1/0x260 [sunrpc]
[<f0b6993b>] rpc_set_active+0x1b/0x60 [sunrpc]
[<f0b64e08>] rpc_call_sync+0x98/0xa0 [sunrpc]
[<f0be06db>] nfs3_rpc_wrapper+0x3b/0x60 [nfs]
[<f0be0a47>] nfs3_proc_getattr+0x47/0x80 [nfs]
[<f0bd6960>] __nfs_revalidate_inode+0x150/0x2f0 [nfs]
[<b0182643>] mntput_no_expire+0x13/0x70
[<b0175a26>] __link_path_walk+0xad6/0xe30
[<b0182643>] mntput_no_expire+0x13/0x70
[<b0175de5>] link_path_walk+0x65/0xc0
[<b015e6b5>] do_mmap_pgoff+0x535/0x7a0
[<f0bd7663>] nfs_getattr+0x63/0xe0 [nfs]
[<b0167f6a>] kmem_cache_free+0x6a/0x80
[<f0bd7600>] nfs_getattr+0x0/0xe0 [nfs]
[<b016f91c>] vfs_getattr+0x4c/0x70
[<b016f974>] vfs_lstat_fd+0x34/0x50
[<b015e6b5>] do_mmap_pgoff+0x535/0x7a0
[<b016f9df>] sys_lstat64+0xf/0x30
[<b01421d4>] rt_up_read+0x24/0x50
[<b0116b37>] do_page_fault+0x1e7/0x620
[<b0104128>] sys_sigreturn+0xb8/0xcc
[<b0104232>] sysenter_past_esp+0x5f/0x85

Also, I forgot to mention I found a workaround to keep it from hanging.

while : ;do ls -d /nfs/mount/data*/. ; sleep 5 ;done

Maybe points to something timing out?

Shane
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