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SubjectAIM7 on 2.5 has process hang in do_IRQ, but 2.4 doesn't
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AIM7 on 2.5.x behaves different than 2.4.x.

On 2.5.x aim7 eventually has a process that doesn't exit.
The process appears to be in an infinite loop. vmstat shows
100% user time. strace -p PID doesn't print anything.

A tasktrace on the hung process (from sysrq T) shows:
multitask R current 16 955243 958223 (NOTLB)
do_IRQ
common_interrupt

vmstat 60 leading up to the never-exiting process:
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
9 0 0 1652 289020 44476 10996 0 0 1 1595 1362 758 67 16 17
17 0 0 1652 288712 44796 8552 0 0 0 2184 1526 1097 56 25 19
17 0 0 1652 282968 45068 8428 0 0 0 1415 1337 694 86 14 0
7 0 0 1652 293420 45380 8532 0 0 0 2028 1486 1019 73 22 5
24 0 0 1652 280248 45696 11572 0 0 0 1767 1416 891 59 23 18
24 0 0 1652 273480 45996 6716 0 0 0 2252 1538 1133 78 22 0
24 0 0 1652 277976 46272 9320 0 0 0 908 1209 438 90 10 0
9 0 0 1652 290508 46608 9000 0 0 0 922 1212 449 83 17 0
1 0 0 1652 294960 46848 6744 0 0 0 1217 1298 604 86 14 0
1 0 0 1652 294944 46864 6744 0 0 0 1 1000 2 100 0 0
5 0 0 1652 294456 46884 6888 5 0 8 0 333 1 95 0 5
1 0 0 1608 294208 46908 7068 1 0 4 0 1003 5 100 0 0
1 0 0 1608 294048 46924 7084 0 0 0 1 1001 2 100 0 0
1 0 0 1608 294032 46940 7084 0 0 0 1 1000 2 100 0 0


14 kernels between 2.5.25 and 2.5.33-mm5 including dj have
behaved the same. None of the 27 kernels between 2.4.19-rc1
and 2.4.20-pre5 (various trees) have had the problem. It has
only been an issue on a uniprocessor box. On SMP aim7 completes
normally.

The last thing in the logfile is a job called "job_timing".
Earlier in the run, job_timing completes on the "dbase" workload.
(job_timing gets scheduled several times).

This is the current config:
CONFIG_X86=y
CONFIG_ISA=y
CONFIG_UID16=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_EXPERIMENTAL=y
CONFIG_NET=y
CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_MK6=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_X86_L1_CACHE_SHIFT=5
CONFIG_X86_ALIGNMENT_16=y
CONFIG_X86_TSC=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_NOHIGHMEM=y
CONFIG_MTRR=y
CONFIG_PCI=y
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_NAMES=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_ELF=y
CONFIG_BLK_DEV_FD=y
CONFIG_IDE=y
CONFIG_BLK_DEV_IDE=y
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_MULTI_MODE=y
CONFIG_BLK_DEV_IDECD=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_BLK_DEV_VIA82CXXX=y
CONFIG_IDEDMA_AUTO=y
CONFIG_BLK_DEV_IDE_MODES=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IPV6_SCTP__=y
CONFIG_NETDEVICES=y
CONFIG_NET_ETHERNET=y
CONFIG_NET_PCI=y
CONFIG_8139TOO=y
CONFIG_INPUT=y
CONFIG_SOUND_GAMEPORT=y
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=64
CONFIG_REISERFS_FS=y
CONFIG_RAMFS=y
CONFIG_ISO9660_FS=y
CONFIG_PROC_FS=y
CONFIG_DEVPTS_FS=y
CONFIG_EXT2_FS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
CONFIG_SUNRPC=y
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_EXPORTFS=y
CONFIG_MSDOS_PARTITION=y
CONFIG_VGA_CONSOLE=y
CONFIG_DEBUG_KERNEL=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_SECURITY_CAPABILITIES=y

Anything else that would be helpful?

--
Randy Hron
http://home.earthlink.net/~rwhron/kernel/bigbox.html

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