Question : Locking max tag count at 64.

Hi all,
       I have redhat 7.3 installed on compaq prolient ml370 machine having 2GB RAM. I have configured mail server using postfix and appache server.

      I am getting the message on console "(scsi0:A:1:0): Locking max count tag at 64". After this message following error code appears on screen:-
filemap.c:2258: bad pmd c0003000(00000000000001e3).
do_IRQ: stack overflow: -864
c0252845 fffffca0 206d6564 c2426000 00000000 c0117b20 c0101018 c024bd2c
c2426000 00000018 00000018 00000000 c0117b20 c0101018 c2426470 6f6e0018
40320018 ffffff00 c0117b43 00000010 00000202 7369636e 3e65642e 613c200a
Call Trace:   [] do_page_fault [kernel] 0x0 (0xc242634c))
[] do_page_fault [kernel] 0x0 (0xc2426368))
[] do_page_fault [kernel] 0x23 (0xc2426380))
[] do_page_fault [kernel] 0x0 (0xc242645c))
[] error_code [kernel] 0x34 (0xc2426464))
[] do_page_fault [kernel] 0x4a5 (0xc2426498))
[] do_page_fault [kernel] 0x0 (0xc2426574))
[] error_code [kernel] 0x34 (0xc242657c))
[] do_page_fault [kernel] 0x4a5 (0xc24265b0))
[] do_page_fault [kernel] 0x0 (0xc242668c))
[] error_code [kernel] 0x34 (0xc2426694))
[] do_page_fault [kernel] 0x4a5 (0xc24266c8))
[] do_page_fault [kernel] 0x0 (0xc24267a4))
[] error_code [kernel] 0x34 (0xc24267ac))

The machine gets hanged and I have to hard boot it again.
Please help me to get rid of this problem.

Answer : Locking max tag count at 64.

That's the kernel crashing, i.e. probably a bug (or maybe defect hardware). You might consider posting to the kernel mailing list, however, somebody else already did.

See http://www.ussg.iu.edu/hypermail/linux/kernel/0308.1/0778.html

It seems the cause has not been found, so posting a similar bug report (with the details of your hardware configuration) might be a good idea.