nvim segfaults on exit in void-linux/armv6-muslc

[equalsraf]

void-linux has a muslc based variant, when Neovim is built against muslc (in armv6) it segfaults on exit, the following command is enough to reproduce

bin/nvim -c ":q" -u NONE

Here's a backtrace

Program received signal SIGSEGV, Segmentation fault.
0x001f9328 in je_tcache_dalloc_small (binind=<optimized out>, ptr=0x283b70, tcache=0xb6a0b000, 
    tsd=<optimized out>) at include/jemalloc/internal/tcache.h:380
380             tbin->avail[tbin->ncached] = ptr;

#0  0x001f9328 in je_tcache_dalloc_small (binind=<optimized out>, ptr=0x283b70, 
    tcache=0xb6a0b000, tsd=<optimized out>) at include/jemalloc/internal/tcache.h:380
#1  je_arena_dalloc (tcache=0xb6a0b000, ptr=0x283b70, tsd=<optimized out>)
    at include/jemalloc/internal/arena.h:1271
#2  je_idalloctm (is_metadata=false, tcache=0xb6a0b000, ptr=0x283b70, tsd=<optimized out>)
    at include/jemalloc/internal/jemalloc_internal.h:1005
#3  je_iqalloc (tcache=0xb6a0b000, ptr=0x283b70, tsd=<optimized out>)
    at include/jemalloc/internal/jemalloc_internal.h:1029
#4  ifree (tsd=<optimized out>, tcache=0xb6a0b000, ptr=0x283b70) at src/jemalloc.c:1745
#5  free (ptr=0x283b70) at src/jemalloc.c:1839
#6  0x001c6244 in uv__free (ptr=<optimized out>)
    at /home/raf/Code/neovim/.deps/build/src/libuv/src/uv-common.c:78
#7  uv_fs_scandir_next (req=req@entry=0xbeffede0, ent=ent@entry=0xbeffef08)
    at /home/raf/Code/neovim/.deps/build/src/libuv/src/uv-common.c:499
#8  0x001b2690 in os_scandir_next (dir=0xbeffede0)
    at /home/raf/Code/neovim/src/nvim/os/fs.c:441
#9  0x00125580 in scandir_next_with_dots (dir=dir@entry=0xbeffedd8)
    at /home/raf/Code/neovim/src/nvim/path.c:537
#10 0x001269fc in do_path_expand (gap=0xb6a33280, gap@entry=0xbeffef58, 
    path=path@entry=0x2815dc <NameBuff> "/tmp/nvimDFbMIC/*", wildoff=wildoff@entry=0, flags=0, 
    flags@entry=35, didstar=didstar@entry=false) at /home/raf/Code/neovim/src/nvim/path.c:661
#11 0x00126ac4 in path_expand (gap=gap@entry=0xbeffef58, 
    path=path@entry=0x2815dc <NameBuff> "/tmp/nvimDFbMIC/*", flags=flags@entry=35)
    at /home/raf/Code/neovim/src/nvim/path.c:522
#12 0x00127ebc in gen_expand_wildcards (num_pat=num_pat@entry=1, pat=0xbeffefb0, 
    pat@entry=0xbeffefa8, num_file=0x0, num_file@entry=0xbeffefa4, file=0x0, 
    file@entry=0xbeffefa0, flags=flags@entry=35) at /home/raf/Code/neovim/src/nvim/path.c:1205
#13 0x0019ea3c in vim_deltempdir () at /home/raf/Code/neovim/src/nvim/tempfile.c:70
#14 0x000e9604 in ml_close_all (del_file=del_file@entry=1)
    at /home/raf/Code/neovim/src/nvim/memline.c:597
#15 0x001247b0 in mch_exit (r=r@entry=0) at /home/raf/Code/neovim/src/nvim/os_unix.c:178
#16 0x000da800 in getout (exitval=exitval@entry=0) at /home/raf/Code/neovim/src/nvim/main.c:622
#17 0x00098058 in ex_quit (eap=0xbefff068) at /home/raf/Code/neovim/src/nvim/ex_docmd.c:5625
#18 0x0009c2b4 in do_one_cmd (cmdlinep=0xbefff144, cmdlinep@entry=0xbefff13c, sourcing=695564, 
    sourcing@entry=0, cstack=0x1, cstack@entry=0xbefff198, fgetline=0x0, 
    fgetline@entry=0x282f8c <je_arena_bin_info+280>, cookie=cookie@entry=0x0)
    at /home/raf/Code/neovim/src/nvim/ex_docmd.c:2185
#19 0x0009cc8c in do_cmdline (cmdline=cmdline@entry=0x0, fgetline=0xa9d0c <getexline>, 
    cookie=cookie@entry=0x0, flags=0) at /home/raf/Code/neovim/src/nvim/ex_docmd.c:611
#20 0x0010336c in nv_colon (cap=0xbefff568) at /home/raf/Code/neovim/src/nvim/normal.c:4422
#21 0x0010dc6c in normal_execute (state=0xbefff4fc, key=<optimized out>)
    at /home/raf/Code/neovim/src/nvim/normal.c:1153
#22 0x0018dea4 in state_enter (s=0xbefff4fc, s@entry=0xbefff4f4)
    at /home/raf/Code/neovim/src/nvim/state.c:55
#23 0x00104ca8 in normal_enter (cmdwin=cmdwin@entry=false, noexmode=noexmode@entry=false)
    at /home/raf/Code/neovim/src/nvim/normal.c:470
#24 0x000db6c8 in main (argc=<optimized out>, argv=<optimized out>)
    at /home/raf/Code/neovim/src/nvim/main.c:537

A quick workaround that worked for me was to disable the use of jemalloc (-DENABLE_JEMALLOC=OFF) but I've been unable to reproduce with a simple test case for jemalloc, so its unclear where the fault lies at.

[justinmk]

@equalsraf Any change here after upgrading musl? Another musl-related crash: #4664

[justinmk]

Closing this because:

• Nvim works on alpine linux which also uses musl.
• We've upgraded jemalloc since this was reported.
• Nvim works on ARM.

Will re-open if anyone has info to the contrary.