mirror of
https://github.com/servomekanism/windows-vs-linux-loader-architecture
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134 lines
7.5 KiB
Plaintext
134 lines
7.5 KiB
Plaintext
This log is taken when the deadlock occurs (^C at program hang). It's from a Fedora 38 machine with GNU ld 2.39 (according to ld --version command).
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============================================================
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Thread 1 waiting for thread 2 to terminate with pthread_join
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============================================================
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Library 1 loaded successfully!
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[New Thread 0x7ffff7dcc6c0 (LWP 4788)]
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Thread started from library constructor!
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^C
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Thread 1 "main" received signal SIGINT, Interrupt.
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0x00007ffff7e59219 in __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=4788, futex_word=0x7ffff7dcc990)
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at futex-internal.c:57
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57 return INTERNAL_SYSCALL_CANCEL (futex_time64, futex_word, op, expected,
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(gdb) backtrace
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#0 0x00007ffff7e59219 in __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265, expected=4788, futex_word=0x7ffff7dcc990)
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at futex-internal.c:57
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#1 __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7ffff7dcc990, expected=4788, clockid=clockid@entry=0, abstime=abstime@entry=0x0,
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private=private@entry=128, cancel=cancel@entry=true) at futex-internal.c:87
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#2 0x00007ffff7e5929f in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7ffff7dcc990, expected=<optimized out>,
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clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=128) at futex-internal.c:139
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#3 0x00007ffff7e5e623 in __pthread_clockjoin_ex (threadid=140737351829184, thread_return=0x0, clockid=0, abstime=0x0, block=<optimized out>)
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at pthread_join_common.c:102
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#4 0x00007ffff7fbe1a8 in func () at lib1.c:23
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#5 0x00007ffff7fcef77 in call_init (env=0x7fffffffe0e8, argv=0x7fffffffe0d8, argc=1, l=<optimized out>) at dl-init.c:90
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#6 call_init (l=<optimized out>, argc=1, argv=0x7fffffffe0d8, env=0x7fffffffe0e8) at dl-init.c:27
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#7 0x00007ffff7fcf06d in _dl_init (main_map=0x4052f0, argc=1, argv=0x7fffffffe0d8, env=0x7fffffffe0e8) at dl-init.c:137
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#8 0x00007ffff7fcb5c2 in __GI__dl_catch_exception (exception=exception@entry=0x0, operate=operate@entry=0x7ffff7fd5c30 <call_dl_init>,
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args=args@entry=0x7fffffffdb00) at dl-catch.c:211
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#9 0x00007ffff7fd5bcc in dl_open_worker (a=a@entry=0x7fffffffdcb0) at dl-open.c:808
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#10 0x00007ffff7fcb523 in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffdc90, operate=operate@entry=0x7ffff7fd5b30 <dl_open_worker>,
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args=args@entry=0x7fffffffdcb0) at dl-catch.c:237
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#11 0x00007ffff7fd5f44 in _dl_open (file=0x402010 "lib1.so", mode=<optimized out>, caller_dlopen=0x40113e <main+24>, nsid=<optimized out>, argc=1,
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argv=0x7fffffffe0d8, env=0x7fffffffe0e8) at dl-open.c:884
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#12 0x00007ffff7e58714 in dlopen_doit (a=a@entry=0x7fffffffdf60) at dlopen.c:56
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#13 0x00007ffff7fcb523 in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffdea0, operate=0x7ffff7e586b0 <dlopen_doit>, args=0x7fffffffdf60)
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at dl-catch.c:237
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#14 0x00007ffff7fcb679 in _dl_catch_error (objname=0x7fffffffdf08, errstring=0x7fffffffdf10, mallocedp=0x7fffffffdf07, operate=<optimized out>,
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args=<optimized out>) at dl-catch.c:256
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#15 0x00007ffff7e581f3 in _dlerror_run (operate=operate@entry=0x7ffff7e586b0 <dlopen_doit>, args=args@entry=0x7fffffffdf60) at dlerror.c:138
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#16 0x00007ffff7e587cf in dlopen_implementation (dl_caller=<optimized out>, mode=<optimized out>, file=<optimized out>) at dlopen.c:71
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#17 ___dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:81
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#18 0x000000000040113e in main () at main.c:4
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(gdb) info threads
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Id Target Id Frame
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* 1 Thread 0x7ffff7dcd740 (LWP 4784) "main" 0x00007ffff7e59219 in __futex_abstimed_wait_common64 (private=128, cancel=true, abstime=0x0, op=265,
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expected=4788, futex_word=0x7ffff7dcc990) at futex-internal.c:57
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2 Thread 0x7ffff7dcc6c0 (LWP 4788) "main" futex_wait (private=0, expected=2, futex_word=0x7ffff7ffda08 <_rtld_local+2568>)
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at ../sysdeps/nptl/futex-internal.h:146
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=======================================================
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Thread 2 deadlocks while trying to acquire dl_load_lock
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=======================================================
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(gdb) thread 2
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[Switching to thread 2 (Thread 0x7ffff7dcc6c0 (LWP 4788))]
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#0 futex_wait (private=0, expected=2, futex_word=0x7ffff7ffda08 <_rtld_local+2568>) at ../sysdeps/nptl/futex-internal.h:146
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146 int err = lll_futex_timed_wait (futex_word, expected, NULL, private);
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(gdb) backtrace
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#0 futex_wait (private=0, expected=2, futex_word=0x7ffff7ffda08 <_rtld_local+2568>) at ../sysdeps/nptl/futex-internal.h:146
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#1 __GI___lll_lock_wait (futex=futex@entry=0x7ffff7ffda08 <_rtld_local+2568>, private=0) at lowlevellock.c:49
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#2 0x00007ffff7e5feb7 in lll_mutex_lock_optimized (mutex=0x7ffff7ffda08 <_rtld_local+2568>) at pthread_mutex_lock.c:48
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#3 ___pthread_mutex_lock (mutex=0x7ffff7ffda08 <_rtld_local+2568>) at pthread_mutex_lock.c:128
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#4 0x00007ffff7fd5edb in _dl_open (file=0x7ffff7fbf029 "lib2.so", mode=-2147483647, caller_dlopen=0x7ffff7fbe160 <thread+39>, nsid=-2, argc=1,
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argv=0x7fffffffe0d8, env=0x7fffffffe0e8) at dl-open.c:830
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#5 0x00007ffff7e58714 in dlopen_doit (a=a@entry=0x7ffff7dcbe70) at dlopen.c:56
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#6 0x00007ffff7fcb523 in __GI__dl_catch_exception (exception=exception@entry=0x7ffff7dcbdb0, operate=0x7ffff7e586b0 <dlopen_doit>, args=0x7ffff7dcbe70)
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at dl-catch.c:237
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#7 0x00007ffff7fcb679 in _dl_catch_error (objname=0x7ffff7dcbe18, errstring=0x7ffff7dcbe20, mallocedp=0x7ffff7dcbe17, operate=<optimized out>,
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args=<optimized out>) at dl-catch.c:256
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#8 0x00007ffff7e581f3 in _dlerror_run (operate=operate@entry=0x7ffff7e586b0 <dlopen_doit>, args=args@entry=0x7ffff7dcbe70) at dlerror.c:138
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#9 0x00007ffff7e587cf in dlopen_implementation (dl_caller=<optimized out>, mode=<optimized out>, file=<optimized out>) at dlopen.c:71
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#10 ___dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:81
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#11 0x00007ffff7fbe160 in thread () at lib1.c:10
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#12 0x00007ffff7e5c947 in start_thread (arg=<optimized out>) at pthread_create.c:444
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#13 0x00007ffff7ee2870 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
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(gdb) up 4
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#4 0x00007ffff7fd5edb in _dl_open (file=0x7ffff7fbf029 "lib2.so", mode=-2147483647, caller_dlopen=0x7ffff7fbe160 <thread+39>, nsid=-2, argc=1,
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argv=0x7fffffffe0d8, env=0x7fffffffe0e8) at dl-open.c:830
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830 __rtld_lock_lock_recursive (GL(dl_load_lock));
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(gdb) list
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825 if ((mode & RTLD_BINDING_MASK) == 0)
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826 /* One of the flags must be set. */
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827 _dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));
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828
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829 /* Make sure we are alone. */
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830 __rtld_lock_lock_recursive (GL(dl_load_lock)); <-- MY NOTE: We deadlock here!
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831
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832 if (__glibc_unlikely (nsid == LM_ID_NEWLM))
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833 {
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834 /* Find a new namespace. */
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(gdb)
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(gdb) set print pretty
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(gdb) print _rtld_global._dl_load_lock
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$1 = {
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mutex = {
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__data = {
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__lock = 2, <-- MY NOTE: Contention
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__count = 1,
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__owner = 4784,
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__nusers = 1,
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__kind = 1,
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__spins = 0,
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__elision = 0,
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__list = {
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__prev = 0x0,
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__next = 0x0
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}
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},
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__size = "\002\000\000\000\001\000\000\000\260\022\000\000\001\000\000\000\001", '\000' <repeats 22 times>,
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__align = 4294967298
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}
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}
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(gdb) print _rtld_global._dl_load_write_lock
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$2 = {
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mutex = {
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__data = {
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__lock = 0,
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__count = 0,
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__owner = 0,
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__nusers = 0,
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__kind = 1,
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__spins = 0,
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__elision = 0,
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__list = {
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__prev = 0x0,
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__next = 0x0
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}
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},
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__size = '\000' <repeats 16 times>, "\001", '\000' <repeats 22 times>,
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__align = 0
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}
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}
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