For me looks like, segfault is happening after create_module() as it is
returning proper value.
-Madhu
On Tue, 18 Feb 2003, David Wuertele wrote:
> I'm trying to write a module that uses devfs, but when I "insmod" that
> module, I get a Segmentation Fault in create_module(). When I run a
> program that just does a create_module() by itself, it does not
> segfault.
>
> I've appended a strace for insmod as well as attached the source for
> the module. The "query_module() = -1 ENOSPC (No space left on
> device)" seems like it might be a clue...
>
> Dave
>
> # strace insmod ./loopie.o
> execve("/sbin/insmod", ["insmod", "./loopie.o"], [/* 18 vars */]) = 0
> uname({sys="Linux", node="ati-stw", ...}) = 0
> brk(0) = 0x1000dea0
> open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("/etc/ld.so.cache", O_RDONLY) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=4400, ...}) = 0
> mmap(NULL, 4400, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2aac2000
> 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\0\10\0\1\0\0\0\334\223"..., 1024) = 1024
> fstat64(3, {st_mode=S_IFREG|0755, st_size=5560392, ...}) = 0
> mmap(NULL, 1703952, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x2ab03000
> mprotect(0x2ac58000, 307216, PROT_NONE) = 0
> mmap(0x2ac97000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x154000) = 0x2ac97000
> mmap(0x2ac9f000, 16400, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2ac9f000
> close(3) = 0
> munmap(0x2aac2000, 4400) = 0
> stat("./loopie.o", {st_mode=S_IFREG|0664, st_size=104516, ...}) = 0
> brk(0) = 0x1000dea0
> brk(0x1000e030) = 0x1000e030
> brk(0x1000f000) = 0x1000f000
> open("./loopie.o", O_RDONLY) = 3
> fstat64(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aac2000
> write(1, "Using ./loopie.o\n", 17Using ./loopie.o
> ) = 17
> fstat64(3, {st_mode=S_IFREG|0664, st_size=104516, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aac3000
> _llseek(3, 0, [0], SEEK_SET) = 0
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\1\0\10\0\1\0\0\0\0\0\0"..., 4096) = 4096
> _llseek(3, 98304, [98304], SEEK_SET) = 0
> read(3, "e private_data in the filp?\n\0\0\0\0"..., 4096) = 4096
> _llseek(3, 0, [0], SEEK_SET) = 0
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\1\0\10\0\1\0\0\0\0\0\0"..., 4096) = 4096
> brk(0x10010000) = 0x10010000
> _llseek(3, 98304, [98304], SEEK_SET) = 0
> read(3, "e private_data in the filp?\n\0\0\0\0"..., 4096) = 4096
> read(3, "\5\4\0\0x\1\0\0\6\4\0\0|\1\0\0\5*\0\0\200\1\0\0\6*\0\0"..., 4096) = 2116
> _llseek(3, 0, [0], SEEK_SET) = 0
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\1\0\10\0\1\0\0\0\0\0\0"..., 4096) = 4096
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> read(3, "\5\4\0\0x\1\0\0\6\4\0\0|\1\0\0\5*\0\0\200\1\0\0\6*\0\0"..., 4096) = 2116
> _llseek(3, 0, [0], SEEK_SET) = 0
> read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\1\0\10\0\1\0\0\0\0\0\0"..., 4096) = 4096
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> read(3, "\5\4\0\0x\1\0\0\6\4\0\0|\1\0\0\5*\0\0\200\1\0\0\6*\0\0"..., 4096) = 2116
> _llseek(3, 104516, [104516], SEEK_SET) = 0
> _llseek(3, 104516, [104516], SEEK_SET) = 0
> _llseek(3, 94208, [94208], SEEK_SET) = 0
> read(3, "\0\0\0*input_fops\0\0016\316\33\0\0\5\3\4\0\0\0*outp"..., 4096) = 4096
> brk(0x10011000) = 0x10011000
> _llseek(3, 98304, [98304], SEEK_SET) = 0
> read(3, "e private_data in the filp?\n\0\0\0\0"..., 4096) = 4096
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> read(3, "\5\4\0\0x\1\0\0\6\4\0\0|\1\0\0\5*\0\0\200\1\0\0\6*\0\0"..., 4096) = 2116
> _llseek(3, 98304, [98304], SEEK_SET) = 0
> read(3, "e private_data in the filp?\n\0\0\0\0"..., 4096) = 4096
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> read(3, "\5\4\0\0x\1\0\0\6\4\0\0|\1\0\0\5*\0\0\200\1\0\0\6*\0\0"..., 4096) = 2116
> _llseek(3, 104516, [104516], SEEK_SET) = 0
> _llseek(3, 104516, [104516], SEEK_SET) = 0
> _llseek(3, 104516, [104516], SEEK_SET) = 0
> _llseek(3, 98304, [98304], SEEK_SET) = 0
> read(3, "e private_data in the filp?\n\0\0\0\0"..., 4096) = 4096
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> _llseek(3, 102400, [102400], SEEK_SET) = 0
> brk(0x10012000) = 0x10012000
> uname({sys="Linux", node="ati-stw", ...}) = 0
> query_module(NULL, 0, NULL, 0) = 0
> query_module(NULL, QM_MODULES, { /* 1 entries */ }, 1) = 0
> query_module("dummy", QM_INFO, {address=0xc0004000, size=3000, flags=MOD_UNINITIALIZED, usecount=0}, 16) = 0
> query_module("dummy", QM_SYMBOLS, { /* 0 entries */ }, 0) = 0
> brk(0x10017000) = 0x10017000
> query_module(NULL, QM_SYMBOLS, 0x10011b28, 16384, 29695) = -1 ENOSPC (No space left on device)
> brk(0x1001f000) = 0x1001f000
> query_module(NULL, QM_SYMBOLS, { /* 1255 entries */ }, 1255) = 0
> create_module("loopie", 2768) = 0xc0002000
> --- SIGSEGV (Segmentation fault) ---
> +++ killed by SIGSEGV +++
> [root@ati-stw /]#
>
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