Re: [linux-cifs-client] Re: BUG: scheduling while atomic - linux 2.6.22

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Dave Kleikamp wrote:

On Tue, 2007-08-28 at 07:11 +0800, Michael Deegan wrote:
Hi,

On Tue Aug 7 16:00:19 GMT 2007, Martin Koegler  wrote:
A vanilla 2.6.22 kernel (SMP PREEMPT i686) produced the following messages, while working with a CIFS mount point:
Aug 27 22:33:08 wibble kernel: BUG: scheduling while atomic: bash/0x00000001/4077
Aug 27 22:33:08 wibble kernel:
Aug 27 22:33:08 wibble kernel: Call Trace:
Aug 27 22:33:08 wibble kernel:  [<ffffffff805265df>] __sched_text_start+0x5f/0x79b
Aug 27 22:33:08 wibble kernel:  [<ffffffff8049cb7a>] kernel_sendmsg+0x2c/0x3e
Aug 27 22:33:08 wibble kernel:  [<ffffffff8032ba42>] wait_for_response+0xbe/0x155
Aug 27 22:33:08 wibble kernel:  [<ffffffff802392bf>] autoremove_wake_function+0x0/0x2e
Aug 27 22:33:08 wibble kernel:  [<ffffffff8032c0e1>] SendReceive+0x1fb/0x3f8
Aug 27 22:33:08 wibble kernel:  [<ffffffff803192c2>] CIFSSMBOpen+0x1c6/0x27a
Aug 27 22:33:08 wibble kernel:  [<ffffffff80323b8a>] cifs_reopen_file+0x1ea/0x356
Aug 27 22:33:08 wibble kernel:  [<ffffffff8032455c>] find_writable_file+0x84/0xe7
Aug 27 22:33:08 wibble kernel:  [<ffffffff80324b51>] is_size_safe_to_change+0x16/0x4e
Aug 27 22:33:08 wibble kernel:  [<ffffffff8032fbc7>] fill_in_inode+0x270/0x4ec
Aug 27 22:33:08 wibble kernel:  [<ffffffff80330c67>] cifs_readdir+0xe24/0x1071
Aug 27 22:33:08 wibble kernel:  [<ffffffff802733c8>] filldir64+0x0/0xb8
Aug 27 22:33:08 wibble kernel:  [<ffffffff80218c71>] do_page_fault+0x40b/0x74a
Aug 27 22:33:08 wibble kernel:  [<ffffffff80527ffb>] __mutex_lock_slowpath+0x234/0x23f
Aug 27 22:33:08 wibble kernel:  [<ffffffff802733c8>] filldir64+0x0/0xb8
Aug 27 22:33:08 wibble kernel:  [<ffffffff80273594>] vfs_readdir+0x5d/0x92
Aug 27 22:33:08 wibble kernel:  [<ffffffff8027363e>] sys_getdents64+0x75/0xba
Aug 27 22:33:08 wibble kernel:  [<ffffffff8052948d>] error_exit+0x0/0x84
Aug 27 22:33:08 wibble kernel:  [<ffffffff8020958e>] system_call+0x7e/0x83
Aug 27 22:33:08 wibble kernel:

I'm using a 2.6.22.1 kernel (with SMP and PREEMPT, including BKL) on Debian
etch AMD64, and Samba 3.0.24-6etch4.

This is a known problem that is fixed in 2.6.23-rc4.  cifs_readdir()
takes a spinlock and calls a blocking function.  The fix is here:
http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a403a0a370946e7dbcda6464a3509089daee54bc

Steve,
Has this patch been submitted to the stable kernel?

No - but seems like a resonable idea, although a little larger than typical patch to stable kernel.
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