drsyms easily runs out of stolen fd space

[derekbruening]

From [email protected] on August 24, 2012 10:41:53

w/ linux built USE_DRSYMS and running cs2bug -verbose 3 where drmem prints
out the symbol for each bb (finally avail in linux!) and prints out a bunch
of syscall and alloc callstacks and thus re-loads pretty much all the
symbol files:

(gdb) bt
#0 syscall_0args () at /work/dr/git/src/core/x86/x86.asm:1088
#1 0x4ea2e4d4 in ?? ()
#2 0xf726c8b7 in fd_priv_dup (curfd=3) at /work/dr/git/src/core/linux/os.c:3542
#3 0xf726cbaf in os_open_protected (fname=0x4f56ce4c "/usr/lib/libdl-2.15.so", os_open_flags=1)
at /work/dr/git/src/core/linux/os.c:3614
#4 0xf725d747 in dr_open_file (fname=fname@entry=0x4f56ce4c "/usr/lib/libdl-2.15.so", mode_flags=mode_flags@entry=1)
at /work/dr/git/src/core/x86/instrument.c:3262
#5 0x73923d76 in load_module (modpath=modpath@entry=0x4f56ce4c "/usr/lib/libdl-2.15.so")
at /work/dr/git/src/ext/drsyms/drsyms_unix.c:106
#6 0x73924069 in drsym_unix_load (modpath=modpath@entry=0x4f56ce4c "/usr/lib/libdl-2.15.so")
at /work/dr/git/src/ext/drsyms/drsyms_unix.c:372
#7 0x73923214 in lookup_or_load (modpath=0x4f56ce4c "/usr/lib/libdl-2.15.so")
at /work/dr/git/src/ext/drsyms/drsyms_linux.c:74
#8 lookup_or_load (modpath=0x4f56ce4c "/usr/lib/libdl-2.15.so") at /work/dr/git/src/ext/drsyms/drsyms_linux.c:197
#9 drsym_lookup_address_local (flags=1, out=0x4ea2e848, modoffs=2768, modpath=0x4f56ce4c "/usr/lib/libdl-2.15.so")
at /work/dr/git/src/ext/drsyms/drsyms_linux.c:142
#10 drsym_lookup_address (modpath=0x4f56ce4c "/usr/lib/libdl-2.15.so", modoffs=2768, out=0x4ea2e848, flags=1)
at /work/dr/git/src/ext/drsyms/drsyms_linux.c:203
#11 0x738bc65f in print_symbol (addr=0x4b9e1ad0 "S\350\036", buf=0x4ea2e9dc "new basic block @0x4b9e1ad0 ==",
bufsz=128, sofar=0x4ea2ea5c) at /work/drmemory/git/src/common/callstack.c:464
#12 0x73831a2f in instru_event_bb_analysis (drcontext=0x4e9dc700, tag=0x4b9e1ad0, bb=0x4ea589e0, for_trace=0 '\000',
translating=0 '\000', user_data=0x4ea62b20) at /work/drmemory/git/src/drmemory/readwrite.c:3927
#13 0x7391bce8 in drmgr_bb_event (drcontext=0x4e9dc700, tag=0x4b9e1ad0, bb=0x4ea589e0, for_trace=0 '\000',
translating=0 '\000') at /work/dr/git/src/ext/drmgr/drmgr.c:317
#14 0xf7259962 in instrument_basic_block (dcontext=0x4e9dc700, tag=0x4b9e1ad0 "S\350\036", bb=0x4ea589e0,
for_trace=false, translating=false, emitflags=0x4ea2eb98) at /work/dr/git/src/core/x86/instrument.c:1361
#15 0xf72123cb in client_process_bb (dcontext=0x4e9dc700, bb=0x4ea2ee3c) at /work/dr/git/src/core/x86/interp.c:2398
#16 0xf7215a78 in build_bb_ilist (dcontext=0x4e9dc700, bb=0x4ea2ee3c) at /work/dr/git/src/core/x86/interp.c:3340
#17 0xf72198c9 in build_basic_block_fragment (dcontext=0x4e9dc700, start=0x4b9e1ad0 "S\350\036", initial_flags=0,
link=true, visible=true, for_trace=false, unmangled_ilist=0x0) at /work/dr/git/src/core/x86/interp.c:4245
#18 0xf70d52bd in dispatch (dcontext=0x4e9dc700) at /work/dr/git/src/core/dispatch.c:186

-steal_fds is only 12 by default. given that if the app runs out we start
giving it the stolen ones, I'm just going to raise this. also note that if
we run out of stolen we just start taking the app's.

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=879

[derekbruening]

From [email protected] on August 24, 2012 14:49:57

This issue was closed by revision r1551 .

Status: Fixed