Re: [uml-devel] Kernel mode fault at addr 0x48965000, ip 0x400e51a4

[stian@nixia.no]

strace -f klogd

so we can see what happens in the child after the fork could be usefull,
since the parent after the fork just exists.



Stian


> Ok, here's the strace results.
>
> 1st is the working one (without lvm2), 2nd is the problem one (with lvm2
> -- loaded by "vgscan", "vgchange -a y", "mount /u0/v0").
>
> Without loading lvm2, uml works just fine.
>
> Host:   	2.4.25-pre4
> Guest:  	2.4.25-pre4-1um
> Gcc:		2.95.3 20010315
> Glibc:		2.2.5-34
> Binutils:	2.14.90.0.7
>
>
> Both traces are starting the same command "klog" ...
>
>
>
> Trace 1 (without lvm2)
>
> # strace klogd
> execve("/usr/sbin/klogd", ["klogd"], [/* 34 vars */]) = 0
> brk(0)                                  = 0x804e750
> open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> SYS_197(0x3, 0xbfffec98, 0x40015604, 0x400156ec, 0x3) = 0
> mmap(0, 1628, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40016000
> close(3)                                = 0
> open("/lib/libc.so.6", O_RDONLY)        = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3"..., 1024) = 1024
> SYS_197(0x3, 0xbfffece8, 0x40015604, 0x400156ec, 0x3) = 0
> mmap(0, 1190528, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40017000
> mprotect(0x40130000, 39552, PROT_NONE)  = 0
> mmap(0x40130000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> 0x119000) = 0x40130000
> mmap(0x40136000, 14976, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40136000
> close(3)                                = 0
> mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x4013a000
> munmap(0x40016000, 1628)                = 0
> brk(0)                                  = 0x804e750
> brk(0x804e780)                          = 0x804e780
> brk(0x804f000)                          = 0x804f000
> chdir("/")                              = 0
> open("/var/run/klogd.pid", O_RDONLY)    = -1 ENOENT (No such file or
> directory)
> fork()                                  = 112
> _exit(0)                                = ?
>
>
>
>
>
> Trace 2 (with lvm2)
> # strace klogd
> execve("/usr/sbin/klogd", ["klogd"], [/* 34 vars */]) = 0
> brk(0)                                  = 0x804e750
> open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or
> directory)
> open("/etc/ld.so.cache", O_RDONLY)      = 3
> SYS_197(0x3, 0xbfffec98, 0x40015604, 0x400156ec, 0x3) = 0
> mmap(0, 1628, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40016000
> close(3)                                = 0
> open("/lib/libc.so.6", O_RDONLY)        = 3
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3"..., 1024) = 1024
> SYS_197(0x3, 0xbfffece8, 0x40015604, 0x400156ec, 0x3) = 0
> mmap(0, 1190528, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40017000
> mprotect(0x40130000, 39552, PROT_NONE)  = 0
> mmap(0x40130000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
> 0x119000) = 0x40130000
> mmap(0x40136000, 14976, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40136000
> close(3)                                = 0
> mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x4013a000
> munmap(0x40016000, 1628)                = 0
> brk(0)                                  = 0x804e750
> brk(0x804e780)                          = 0x804e780
> brk(0x804f000)                          = 0x804f000
> chdir("/")                              = 0
> open("/var/run/klogd.pid", O_RDONLY)    = -1 ENOENT (No such file or
> directory)
> fork()                                  = 147
> Kernel panic: Kernel mode fault at addr 0x488b5000, ip 0x400df1a4
>
>
>
> Thanks,
> Jeff
>
> On Tue, 6 Jan 2004, Johannes Formann wrote:
>
>> At 21:58 Uhr -0500 05.01.2004, Jeff Dike wrote:
>> >jchua@fedex.com said:
>> >>  Starting daemons: syslogd klogd inetd namedKernel panic: Kernel mode
>> >>  fault at addr 0x48965000, ip 0x400e51a4
>> >
>> >Can you get a stack trace from the panic?
>>
>> a simple strace $comand_to_run_uml?
>
>
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