wmaker segfaults immediately (related to libfontconfig1 update) #62
Description
From Debian bug #1126087:
Date: Wed, 21 Jan 2026 18:08:04 +0100
From: Andreas Metzler ametzler@bebt.de
To: Debian Bug Tracking System submit@bugs.debian.org
Subject: wmaker segfaults immediately (related to libfontconfig1 update)
Message-ID: aXEH9Fvynh90G0Sb@argenau.bebt.de
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Package: wmaker
Version: 0.96.0-4+b1
Severity: seriousIirc two days ago (Mon 19 Jan) wmaker stopped working, it crashes
immediately. Downgrading libfontconfig1 from 2.17.1-3 to 2.15.0-2.4
(and libpangoft2-1.0-0 to 1.56.4-1) makes the crash go away.I have rebuilt with DEB_BUILD_OPTIONS="nostrip noopt" to get a
backtrace (in Xnest):----------------- GNU gdb (Debian 17.1-1) 17.1 Copyright (C) 2025 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/libexec/WindowMaker/wmaker... (gdb) set pagination 0 (gdb) run Starting program: /usr/libexec/WindowMaker/wmaker This GDB supports auto-downloading debuginfo from the following URLs: <https://debuginfod.debian.net/> Enable debuginfod for this session? (y or [n]) y Debuginfod has been enabled. To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit. [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1". [Detaching after fork from child process 158471] Xlib: extension "MIT-SHM" missing on display ":1". Fontconfig warning: using without calling FcInit() Xlib: extension "MIT-SHM" missing on display ":1". Fontconfig warning: using without calling FcInit() Program received signal SIGSEGV, Segmentation fault. Download failed: Invalid argument. Continuing without source file ./src/./src/fcpat.c. FcPatternObjectAddWithBinding (p=0x0, object=12, value=..., binding=FcValueBindingStrong, append=1) at ./src/fcpat.c:654 ⚠️ warning: 654 ./src/fcpat.c: No such file or directory (gdb) backtrace full #0 FcPatternObjectAddWithBinding (p=0x0, object=12, value=..., binding=FcValueBindingStrong, append=1) at ./src/fcpat.c:654 e = <optimized out> newp = <optimized out> prev = <optimized out> bail0 = <optimized out> #1 0x00007ffff7f5e8b5 in makeFontOfSize ( font=0x555555641540 "sans serif:pixelsize=12:xlfd=-*-helvetica-medium-r-normal-*-%d-*-*-*-*-*-*-*", size=0, fallback=0x0) at ./WINGs/wfont.c:109 pattern = 0x0 result = 0x7ffff7ddfb17 <_XAllocID+39> "H\211\330[\303\017\037@" #2 0x00007ffff7f5edb9 in WMSystemFontOfSize (scrPtr=0x555555641660, size=0) at ./WINGs/wfont.c:265 font = 0x7ffff7ffd000 <_rtld_global> fontSpec = 0x1 <error: Cannot access memory at address 0x1> __func__ = "WMSystemFontOfSize" #3 0x00007ffff7f62c6f in WMCreateScreenWithRContext (display=0x5555556358e0, screen=0, context=0x555555637440) at ./WINGs/widgets.c:764 scrPtr = 0x555555641660 gcv = {function = 3, plane_mask = 6536558756890480384, foreground = 5330257, background = 11446958, line_width = 1, line_style = 0, cap_style = -7672, join_style = 32767, fill_style = 2, fill_rule = 21845, arc_mode = -135301844, tile = 0, stipple = 2097160, ts_x_origin = 0, ts_y_origin = 0, font = 93824993155296, subwindow_mode = 1, graphics_exposures = 0, clip_x_origin = 1432581184, clip_y_origin = 21845, clip_mask = 140737488346352, dash_offset = 80, dashes = 0 '\000'} stipple = 2097160 initialized = 1 atomNames = {0x7ffff7f900fb "_GNUSTEP_WM_ATTR", 0x7ffff7f9010c "WM_DELETE_WINDOW", 0x7ffff7f9011d "WM_PROTOCOLS", 0x7ffff7f9012a "CLIPBOARD", 0x7ffff7f90134 "XdndAware", 0x7ffff7f9013e "XdndSelection", 0x7ffff7f9014c "XdndEnter", 0x7ffff7f90156 "XdndLeave", 0x7ffff7f90160 "XdndPosition", 0x7ffff7f9016d "XdndDrop", 0x7ffff7f90176 "XdndFinished", 0x7ffff7f90183 "XdndTypeList", 0x7ffff7f90190 "XdndActionList", 0x7ffff7f9019f "XdndActionDescription", 0x7ffff7f901b5 "XdndStatus", 0x7ffff7f901c0 "XdndActionCopy", 0x7ffff7f901cf "XdndActionMove", 0x7ffff7f901de "XdndActionLink", 0x7ffff7f901ed "XdndActionAsk", 0x7ffff7f901fb "XdndActionPrivate", 0x7ffff7f9020d "_WINGS_DND_MOUSE_OFFSET", 0x7ffff7f90225 "WM_STATE", 0x7ffff7f9022e "UTF8_STRING", 0x7ffff7f9023a "_NET_WM_NAME", 0x7ffff7f90247 "_NET_WM_ICON_NAME", 0x7ffff7f90259 "_NET_WM_ICON"} atoms = {0, 0, 0, 0, 140737488346712, 140737343325422, 93824993169136, 140737488346456, 140733193388035, 5, 93824993164736, 140737343326889, 93824993155296, 6536558756890480384, 0, 93824993164736, 0, 93824993161712, 0, 93824993164736, 1432574176, 140737343331827, 0, 93824993155296, 140737488346624, 6536558756890480384} i = 8 __func__ = "WMCreateScreenWithRContext" #4 0x00007ffff7f623f9 in WMCreateScreen (display=0x5555556358e0, screen=0) at ./WINGs/widgets.c:564 No locals. #5 0x0000555555589998 in wShowCrashingDialogPanel (whatSig=11) at ./src/dialog.c:1715 panel = 0x5555556371f0 scr = 0x555555637cf0 font = 0x7ffff7ddff52 <_XReply+866> logo = 0x5555556358e0 screen_no = 0 scr_width = 1024 scr_height = 768 action = 21845 buf = "@\337\377\377\377\177\000\000PlcUUU\000\000\001\000\000\000\000\000\000\000\377\353\334\367\377\177\000\000\342\334bUUU\000\000\001\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000 \000\000\000\000\000\000\000\240RcUUU\000\000\n\000\000\000\000\000\000\000\001\000\004", '\000' <repeats 29 times>, "\270\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\000\320\377\367\377\177\000\000VL\252\367\377\177\000\000\270\302`UUU\000\000\000\000\000\000\000\000\000\000\270\302`UUU\000\000\000\000\000\000\000\000\000\000 ", '\000' <repeats 15 times>, "\030\000\000\000\000\000\000\000"... __func__ = "wShowCrashingDialogPanel" #6 0x00005555555b2f74 in showCrashDialog (sig=11) at ./src/monitor.c:52 crashAction = -7672 __func__ = "showCrashDialog" #7 0x00005555555b3335 in MonitorLoop (argc=1, argv=0x7fffffffe1f8) at ./src/monitor.c:128 pid = 158471 exited = 158471 child_argv = 0x5555556358c0 i = 2 status = 11 last_start = 1768979031 error = 0 __func__ = "MonitorLoop" #8 0x00005555555aa410 in main (argc=1, argv=0x7fffffffe1f8) at ./src/main.c:609 i_am_the_monitor = 1 i = 1 len = 66 str = 0x55555562dca0 "DISPLAY=:1" alt = 0x0 __func__ = "main" (gdb) info registers rax 0xc 12 rbx 0x0 0 rcx 0x4028000000000000 4622945017495814144 rdx 0x2 2 rsi 0xc 12 rdi 0x0 0 rbp 0x7fffffffdbb0 0x7fffffffdbb0 rsp 0x7fffffffdb30 0x7fffffffdb30 r8 0x1 1 r9 0x1 1 r10 0x71 113 r11 0x202 514 r12 0x1 1 r13 0x2 2 r14 0x7fffffffe208 140737488347656 r15 0x55555560c2b8 93824992985784 rip 0x7ffff79663c5 0x7ffff79663c5 <FcPatternObjectAddWithBinding+21> eflags 0x10206 [ PF IF RF ] cs 0x33 51 ss 0x2b 43 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 fs_base 0x7ffff6683940 140737327413568 gs_base 0x0 0 (gdb) x/16i $pc => 0x7ffff79663c5 <FcPatternObjectAddWithBinding+21>: mov 0x10(%rdi),%eax 0x7ffff79663c8 <FcPatternObjectAddWithBinding+24>: cmp $0xffffffff,%eax 0x7ffff79663cb <FcPatternObjectAddWithBinding+27>: je 0x7ffff796641e <FcPatternObjectAddWithBinding+110> 0x7ffff79663cd <FcPatternObjectAddWithBinding+29>: mov %rdi,%rbp 0x7ffff79663d0 <FcPatternObjectAddWithBinding+32>: mov %esi,%r15d 0x7ffff79663d3 <FcPatternObjectAddWithBinding+35>: mov $0x1,%edi 0x7ffff79663d8 <FcPatternObjectAddWithBinding+40>: mov $0x20,%esi 0x7ffff79663dd <FcPatternObjectAddWithBinding+45>: mov %r9d,0xc(%rsp) 0x7ffff79663e2 <FcPatternObjectAddWithBinding+50>: mov %rcx,%r14 0x7ffff79663e5 <FcPatternObjectAddWithBinding+53>: mov %r8d,%r12d 0x7ffff79663e8 <FcPatternObjectAddWithBinding+56>: call 0x7ffff79474d0 <calloc@plt> 0x7ffff79663ed <FcPatternObjectAddWithBinding+61>: mov %rax,%rbx 0x7ffff79663f0 <FcPatternObjectAddWithBinding+64>: test %rax,%rax 0x7ffff79663f3 <FcPatternObjectAddWithBinding+67>: je 0x7ffff796641e <FcPatternObjectAddWithBinding+110> 0x7ffff79663f5 <FcPatternObjectAddWithBinding+69>: mov %r13d,%edi 0x7ffff79663f8 <FcPatternObjectAddWithBinding+72>: mov %r14,%rsi (gdb) thread apply all backtrace Thread 1 (Thread 0x7ffff6683940 (LWP 158468) "wmaker"): #0 FcPatternObjectAddWithBinding (p=0x0, object=12, value=..., binding=FcValueBindingStrong, append=1) at ./src/fcpat.c:654 #1 0x00007ffff7f5e8b5 in makeFontOfSize (font=0x555555641540 "sans serif:pixelsize=12:xlfd=-*-helvetica-medium-r-normal-*-%d-*-*-*-*-*-*-*", size=0, fallback=0x0) at ./WINGs/wfont.c:109 #2 0x00007ffff7f5edb9 in WMSystemFontOfSize (scrPtr=0x555555641660, size=0) at ./WINGs/wfont.c:265 #3 0x00007ffff7f62c6f in WMCreateScreenWithRContext (display=0x5555556358e0, screen=0, context=0x555555637440) at ./WINGs/widgets.c:764 #4 0x00007ffff7f623f9 in WMCreateScreen (display=0x5555556358e0, screen=0) at ./WINGs/widgets.c:564 #5 0x0000555555589998 in wShowCrashingDialogPanel (whatSig=11) at ./src/dialog.c:1715 #6 0x00005555555b2f74 in showCrashDialog (sig=11) at ./src/monitor.c:52 #7 0x00005555555b3335 in MonitorLoop (argc=1, argv=0x7fffffffe1f8) at ./src/monitor.c:128 #8 0x00005555555aa410 in main (argc=1, argv=0x7fffffffe1f8) at ./src/main.c:609 (gdb) quit -----------------Throwing some printfs at WINGs/wfont.c yields that the crash happens
at callingFcPatternAddDoublein the else branch ofif (size > 0) { FcPatternDel(pattern, FC_PIXEL_SIZE); FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)size); } else if (size == 0 && !hasProperty(pattern, "size") && !hasProperty(pattern, FC_PIXEL_SIZE)) { FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)DEFAULT_SIZE); }cu Andreas
-- System Information:
Debian Release: forky/sid
APT prefers testing
APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)Kernel: Linux 6.17.13+deb14-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=de_AT.UTF-8, LC_CTYPE=de_AT.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabledVersions of packages wmaker depends on:
ii libc6 2.42-9
ii libexif12 0.6.25-1+b1
ii libfontconfig1 2.17.1-3
ii libwings3 0.96.0-4+b1
ii libwraster6 0.96.0-4+b1
ii libwutil5 0.96.0-4+b1
ii libx11-6 2:1.8.12-1+b1
ii libxext6 2:1.3.4-1+b4
ii libxinerama1 2:1.1.4-3+b5
ii libxpm4 1:3.5.17-1+b4
ii wmaker-common 0.96.0-4+b1wmaker recommends no packages.
Versions of packages wmaker suggests:
ii desktop-base 14.0.0~pre2
ii mlterm [x-terminal-emulator] 3.9.4-3
pn wmaker-data
pn wmaker-utils
ii x11-apps 7.7+11+b1
ii xterm [x-terminal-emulator] 406-1-- no debconf information