From: Andrew Hunt <andy@...>
Date: 2000-05-18T23:18:37-04:00
Subject: [ruby-talk:02901] Re: mod_ruby SEGV

	Shugo writes:
	>Can you get a stacktrace with gdb?
	>
	>ex).
	>
	># gdb /usr/sbin/apache
	>...
	>(gdb) run -X
	><SEGV>
	>(gdb) bt

Well, not a very helpful one:

Program received signal SIGSEGV, Segmentation fault.
0x4028b52c in ?? () from /usr/local/lib/libruby.so.1.5
(gdb) bt
#0  0x4028b52c in ?? () from /usr/local/lib/libruby.so.1.5
#1  0x4028b695 in ?? () from /usr/local/lib/libruby.so.1.5

Everything is compiled with -g, but it doesn't look like there
is much left to report.

strace ends up with the following:

stat("/usr/local/lib/ruby/site_ruby/1.5/i686-linux/delegate.rb", 0xbfffca3c) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/site_ruby/1.5/delegate.rb", 0xbfffca3c) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/site_ruby/delegate.rb", 0xbfffca3c) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/1.5/i686-linux/delegate.rb", 0xbfffca3c) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/1.5/delegate.rb", {st_mode=0, st_size=0, ...}) = 0
stat("/usr/local/lib/ruby/site_ruby/1.5/i686-linux/delegate.rb", 0xbfffc924) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/site_ruby/1.5/delegate.rb", 0xbfffc924) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/site_ruby/delegate.rb", 0xbfffc924) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/1.5/i686-linux/delegate.rb", 0xbfffc924) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/ruby/1.5/delegate.rb", {st_mode=0, st_size=0, ...}) = 0
open("/usr/local/lib/ruby/1.5/delegate.rb", O_RDONLY) = 4
close(4)                                = 0
open("/usr/local/lib/ruby/1.5/delegate.rb", O_RDONLY) = 4
gettimeofday({958706117, 327257}, NULL) = 0
select(5, [4], [], [], {298, 542147})   = 1 (in [4], left {298, 550000})
fstat(4, {st_mode=0, st_size=0, ...})   = 0
mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40190000
read(4, "#  Delegation class that delegat"..., 4096) = 2384
gettimeofday({958706117, 336703}, NULL) = 0
select(5, [4], [], [], {298, 532702})   = 1 (in [4], left {298, 540000})
read(4, "", 4096)                       = 0
close(4)                                = 0
munmap(0x40190000, 4096)                = 0
--- SIGVTALRM (Virtual timer expired) ---
sigreturn()                             = ? (mask now [])
--- SIGVTALRM (Virtual timer expired) ---
sigreturn()                             = ? (mask now [])
mmap(0, 200704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x401e8000
gettimeofday({958706117, 373618}, NULL) = 0
select(1, [], [], [], {0, 0})           = 0 (Timeout)
brk(0x80df000)                          = 0x80df000
--- SIGVTALRM (Virtual timer expired) ---
sigreturn()                             = ? (mask now [])
gettimeofday({958706117, 398210}, NULL) = 0
select(1, [], [], [], {0, 0})           = 0 (Timeout)
--- SIGVTALRM (Virtual timer expired) ---
sigreturn()                             = ? (mask now [])
gettimeofday({958706117, 409338}, NULL) = 0
select(1, [], [], [], {0, 0})           = 0 (Timeout)
brk(0x80e1000)                          = 0x80e1000
alarm(300)                              = 300
alarm(0)                                = 300
gettimeofday({958706117, 416560}, NULL) = 0
gettimeofday({958706117, 416954}, NULL) = 0
--- SIGSEGV (Segmentation fault) ---
write(2, "/usr/local/lib/ruby/1.5/cgi.rb:1"..., 61) = 61
write(2, "\n", 1)                       = 1
sigprocmask(SIG_UNBLOCK, [ABRT], NULL)  = 0
getpid()                                = 4300
kill(4300, SIGABRT)                     = 0
--- SIGABRT (Aborted) ---
+++ killed by SIGABRT +++