Error in `git': free(): invalid pointer (was Re: [PATCH] sequencer: improve config handling)

I recently encountered that error when trying to do an interactive rebase after using filter-branch to remove a file completely in a repository. I bisected this issue which pointed at this patch. I'm not sure how it is related as I'm not too familiar with the sequencer code. I could help in case any specific information is needed. As a first step, I've posted the output of "strace /mnt/Source//Git/git rebase -i HEAD~10" below.

-- 8< -- execve("/mnt/Source//Git/git-next/git", ["/mnt/Source//Git/git-next/git", "rebase", "-i", "HEAD~10"], [/* 62 vars */]) = 0 brk(NULL) = 0x55a494d30000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f25bd940000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=114620, ...}) = 0 mmap(NULL, 114620, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f25bd924000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libz.so.1", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300!\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=105088, ...}) = 0 mmap(NULL, 2200072, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f25bd506000 mprotect(0x7f25bd51f000, 2093056, PROT_NONE) = 0 mmap(0x7f25bd71e000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0x7f25bd71e000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0Pa\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=135440, ...}) = 0 mmap(NULL, 2212936, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f25bd2e9000 mprotect(0x7f25bd301000, 2093056, PROT_NONE) = 0 mmap(0x7f25bd500000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f25bd500000 mmap(0x7f25bd502000, 13384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f25bd502000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/librt.so.1", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340 \0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=31744, ...}) = 0 mmap(NULL, 2128832, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f25bd0e1000 mprotect(0x7f25bd0e8000, 2093056, PROT_NONE) = 0 mmap(0x7f25bd2e7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f25bd2e7000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\4\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1689360, ...}) = 0 mmap(NULL, 3795296, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f25bcd42000 mprotect(0x7f25bced7000, 2097152, PROT_NONE) = 0 mmap(0x7f25bd0d7000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x195000) = 0x7f25bd0d7000 mmap(0x7f25bd0dd000, 14688, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f25bd0dd000 close(3) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f25bd922000 arch_prctl(ARCH_SET_FS, 0x7f25bd922e80) = 0 mprotect(0x7f25bd0d7000, 16384, PROT_READ) = 0 mprotect(0x7f25bd500000, 4096, PROT_READ) = 0 mprotect(0x7f25bd2e7000, 4096, PROT_READ) = 0 mprotect(0x7f25bd71e000, 4096, PROT_READ) = 0 mprotect(0x55a49424b000, 12288, PROT_READ) = 0 mprotect(0x7f25bd943000, 4096, PROT_READ) = 0 munmap(0x7f25bd924000, 114620) = 0 set_tid_address(0x7f25bd923150) = 9667 set_robust_list(0x7f25bd923160, 24) = 0 rt_sigaction(SIGRTMIN, {sa_handler=0x7f25bd2eebd0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f25bd2fa0c0}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7f25bd2eec60, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f25bd2fa0c0}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 open("/dev/null", O_RDWR) = 3 close(3) = 0 rt_sigprocmask(SIG_UNBLOCK, [PIPE], NULL, 8) = 0 rt_sigaction(SIGPIPE, {sa_handler=SIG_DFL, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0 brk(NULL) = 0x55a494d30000 brk(0x55a494d51000) = 0x55a494d51000 getcwd("/mnt/Source/bash/lxconf-bash", 129) = 29 stat("/mnt/Source/bash/lxconf-bash", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 stat("/mnt/Source/bash/lxconf-bash/.git", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 lstat("/mnt/Source/bash/lxconf-bash/.git/HEAD", {st_mode=S_IFREG|0644, st_size=23, ...}) = 0 open("/mnt/Source/bash/lxconf-bash/.git/HEAD", O_RDONLY) = 3 read(3, "ref: refs/heads/public\n", 255) = 23 read(3, "", 232) = 0 close(3) = 0 lstat("/mnt/Source/bash/lxconf-bash/.git/commondir", 0x7ffcd3d12100) = -1 ENOENT (No such file or directory) access("/mnt/Source/bash/lxconf-bash/.git/objects", X_OK) = 0 access("/mnt/Source/bash/lxconf-bash/.git/refs", X_OK) = 0 lstat(".git/commondir", 0x7ffcd3d12270) = -1 ENOENT (No such file or directory) open(".git/config", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=738, ...}) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=738, ...}) = 0 read(3, "[core]\n\trepositoryformatversion "..., 4096) = 738 read(3, "", 4096) = 0 close(3) = 0 access("/home/unique/.local/etc/gitconfig", R_OK) = -1 ENOENT (No such file or directory) access("/home/unique/.config/git/config", R_OK) = -1 ENOENT (No such file or directory) access("/home/unique/.gitconfig", R_OK) = 0 open("/home/unique/.gitconfig", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=866, ...}) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=866, ...}) = 0 read(3, "[user]\n\temail = kaartic.sivaraam"..., 4096) = 866 read(3, "", 4096) = 0 close(3) = 0 access(".git/config", R_OK) = 0 open(".git/config", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=738, ...}) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=738, ...}) = 0 read(3, "[core]\n\trepositoryformatversion "..., 4096) = 738 read(3, "", 4096) = 0 close(3) = 0 pipe([3, 4]) = 0 stat("/home/unique/.local/libexec/git-core/git-rebase", {st_mode=S_IFREG|0755, st_size=16486, ...}) = 0 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f25bd923150) = 9668 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 rt_sigaction(SIGINT, {sa_handler=0x55a493f78a70, sa_mask=[INT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0 rt_sigaction(SIGHUP, {sa_handler=0x55a493f78a70, sa_mask=[HUP], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0 rt_sigaction(SIGTERM, {sa_handler=0x55a493f78a70, sa_mask=[TERM], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0 rt_sigaction(SIGQUIT, {sa_handler=0x55a493f78a70, sa_mask=[QUIT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0 rt_sigaction(SIGPIPE, {sa_handler=0x55a493f78a70, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, {sa_handler=SIG_DFL, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f25bcd75060}, 8) = 0 close(4) = 0 read(3, "", 8) = 0 close(3) = 0 wait4(9668, *** Error in `git': free(): invalid pointer: 0x0000557bf5cdf98a *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x70bfb)[0x7fcb647d1bfb] /lib/x86_64-linux-gnu/libc.so.6(+0x76fc6)[0x7fcb647d7fc6] /lib/x86_64-linux-gnu/libc.so.6(+0x7780e)[0x7fcb647d880e] git(+0x1463f9)[0x557bf5c853f9] git(+0x6b5dd)[0x557bf5baa5dd] git(+0x13848)[0x557bf5b52848] git(+0x13b06)[0x557bf5b52b06] git(+0x12c0c)[0x557bf5b51c0c] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7fcb647812e1] git(+0x12c4a)[0x557bf5b51c4a] ======= Memory map: ======== 557bf5b3f000-557bf5d4e000 r-xp 00000000 08:09 1178454 /home/unique/.local/libexec/git-core/git 557bf5f4d000-557bf5f50000 r--p 0020e000 08:09 1178454 /home/unique/.local/libexec/git-core/git 557bf5f50000-557bf5f5c000 rw-p 00211000 08:09 1178454 /home/unique/.local/libexec/git-core/git 557bf5f5c000-557bf5f9f000 rw-p 00000000 00:00 0 557bf7917000-557bf795d000 rw-p 00000000 00:00 0 [heap] 7fcb60000000-7fcb60021000 rw-p 00000000 00:00 0 7fcb60021000-7fcb64000000 ---p 00000000 00:00 0 7fcb6454a000-7fcb64560000 r-xp 00000000 08:0b 263716 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fcb64560000-7fcb6475f000 ---p 00016000 08:0b 263716 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fcb6475f000-7fcb64760000 r--p 00015000 08:0b 263716 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fcb64760000-7fcb64761000 rw-p 00016000 08:0b 263716 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fcb64761000-7fcb648f6000 r-xp 00000000 08:0b 268114 /lib/x86_64-linux-gnu/libc-2.24.so 7fcb648f6000-7fcb64af6000 ---p 00195000 08:0b 268114 /lib/x86_64-linux-gnu/libc-2.24.so 7fcb64af6000-7fcb64afa000 r--p 00195000 08:0b 268114 /lib/x86_64-linux-gnu/libc-2.24.so 7fcb64afa000-7fcb64afc000 rw-p 00199000 08:0b 268114 /lib/x86_64-linux-gnu/libc-2.24.so 7fcb64afc000-7fcb64b00000 rw-p 00000000 00:00 0 7fcb64b00000-7fcb64b07000 r-xp 00000000 08:0b 268132 /lib/x86_64-linux-gnu/librt-2.24.so 7fcb64b07000-7fcb64d06000 ---p 00007000 08:0b 268132 /lib/x86_64-linux-gnu/librt-2.24.so 7fcb64d06000-7fcb64d07000 r--p 00006000 08:0b 268132 /lib/x86_64-linux-gnu/librt-2.24.so 7fcb64d07000-7fcb64d08000 rw-p 00007000 08:0b 268132 /lib/x86_64-linux-gnu/librt-2.24.so 7fcb64d08000-7fcb64d20000 r-xp 00000000 08:0b 268130 /lib/x86_64-linux-gnu/libpthread-2.24.so 7fcb64d20000-7fcb64f1f000 ---p 00018000 08:0b 268130 /lib/x86_64-linux-gnu/libpthread-2.24.so 7fcb64f1f000-7fcb64f20000 r--p 00017000 08:0b 268130 /lib/x86_64-linux-gnu/libpthread-2.24.so 7fcb64f20000-7fcb64f21000 rw-p 00018000 08:0b 268130 /lib/x86_64-linux-gnu/libpthread-2.24.so 7fcb64f21000-7fcb64f25000 rw-p 00000000 00:00 0 7fcb64f25000-7fcb64f3e000 r-xp 00000000 08:0b 263835 /lib/x86_64-linux-gnu/libz.so.1.2.8 7fcb64f3e000-7fcb6513d000 ---p 00019000 08:0b 263835 /lib/x86_64-linux-gnu/libz.so.1.2.8 7fcb6513d000-7fcb6513e000 r--p 00018000 08:0b 263835 /lib/x86_64-linux-gnu/libz.so.1.2.8 7fcb6513e000-7fcb6513f000 rw-p 00019000 08:0b 263835 /lib/x86_64-linux-gnu/libz.so.1.2.8 7fcb6513f000-7fcb65162000 r-xp 00000000 08:0b 263494 /lib/x86_64-linux-gnu/ld-2.24.so 7fcb652c1000-7fcb65343000 rw-p 00000000 00:00 0 7fcb6535d000-7fcb6535e000 rw-p 00000000 00:00 0 7fcb6535e000-7fcb6535f000 r--p 00000000 08:06 57439 /mnt/Source/bash/lxconf-bash/.git/packed-refs 7fcb6535f000-7fcb65362000 rw-p 00000000 00:00 0 7fcb65362000-7fcb65363000 r--p 00023000 08:0b 263494 /lib/x86_64-linux-gnu/ld-2.24.so 7fcb65363000-7fcb65364000 rw-p 00024000 08:0b 263494 /lib/x86_64-linux-gnu/ld-2.24.so 7fcb65364000-7fcb65365000 rw-p 00000000 00:00 0 7ffdf94a1000-7ffdf94c2000 rw-p 00000000 00:00 0 [stack] 7ffdf95cf000-7ffdf95d1000 r--p 00000000 00:00 0 [vvar] 7ffdf95d1000-7ffdf95d3000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] [{WIFSIGNALED(s) && WTERMSIG(s) == SIGABRT}], 0, NULL) = 9668 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=9668, si_uid=1000, si_status=SIGABRT, si_utime=0, si_stime=1} --- write(2, "error: git-rebase died of signal"..., 35error: git-rebase died of signal 6 ) = 35 exit_group(134) = ? +++ exited with 134 +++