Date: Tue, 03 Sep 2002 21:56:32 +0200 From: "D. Rock" <D.Rock@t-online.de> To: current@freebsd.org Subject: CURRENT unstable during heavy file system I/O Message-ID: <3D7513F0.5000803@t-online.de>
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Hi,
since some months now my -CURRENT is very unstable during heavy file system
activity (parallel accesses while deleting large subdirectories).
Today, I ran the following command for simple cleanup of /usr/ports:
# find /usr/ports -type d -name work -print | xargs rm -rf
[Yes, I should have added an option -maxdepth 3]. During this cleanup the
machine panic'd twice. I don't have a crash dump, only console output:
Fatal double fault:
eip = 0xc04304c8
esp = 0xd85e8fb8
ebp = 0xd85e980c
panic: double fault
Debugger("panic")
Stopped at Debugger+0x54: xchgl %ebx,in_Debugger.0
db> c
syncing disks... panic: bwrite: buffer is not busy???
Debugger("panic")
Stopped at Debugger+0x54: xchgl %ebx,in_Debugger.0
db> c
Uptime: 26m29s
Dumping 127 MB
ata0: resetting devices ..
panic: bremfree: removing a buffer not on a queue
Debugger("panic")
Stopped at Debugger+0x54: xchgl %ebx,in_Debugger.0
db> c
Uptime: 26m29s
Terminate ACPI
Automatic reboot in 15 seconds - press a key on the console to abort
gdb at address 0xc04304c8:
Dump of assembler code for function bus_dmamap_load:
0xc0430340 <bus_dmamap_load>: push %ebp
[...]
0xc04304b8 <bus_dmamap_load+376>: mov %eax,0xfffffff0(%ebp)
0xc04304bb <bus_dmamap_load+379>: mov 0xffffffe4(%ebp),%edx
0xc04304be <bus_dmamap_load+382>: mov %edx,0xffffffe0(%ebp)
0xc04304c1 <bus_dmamap_load+385>: movl $0x1,0xffffffdc(%ebp)
0xc04304c8 <bus_dmamap_load+392>: movl $0x0,0x4(%edx)
0xc04304cf <bus_dmamap_load+399>: movl $0x0,0xffffffd4(%ebp)
0xc04304d6 <bus_dmamap_load+406>: lea 0x0(%esi),%esi
0xc04304d9 <bus_dmamap_load+409>: lea 0x0(%edi,1),%edi
0xc04304e0 <bus_dmamap_load+416>: mov 0xfffffff0(%ebp),%ecx
0xc04304e3 <bus_dmamap_load+419>: mov %ecx,%eax
0xc04304e5 <bus_dmamap_load+421>: shr $0x16,%eax
The panic "bwrite: buffer is not busy???" is always the same.
Daniel
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