dune build -w stops with epipe after running for a while #6870
Description
Expected Behavior
dune build -w should keep running forever.
Actual Behavior
dune build -w stops after a while with exit code 141 (epipe).
Reproduction
Difficult, see additional information
Specifications
- Version of
dune(output ofdune --version): 3.6.1 - Version of
ocaml(output ofocamlc --version): 5.0.0 (with musl) - Operating system (distribution and version): Linux 6.1.3
Additional information
It took about 20 minutes to reproduce in a big project. I ran dune under strace, and the relevant output is (the first epipe happens in a write syscall to _build/.rpc/dune):
26909 12:24:30.544092 write(11<UNIX-STREAM:[133385->136255,"_build/.rpc/dune"]>, "((2:id((4:poll(4:auto1:0))(1:i1:"..., 115 <unfinished ...>
24172 12:24:30.544101 <... madvise resumed>) = 0
26909 12:24:30.544104 <... write resumed>) = -1 EPIPE (Broken pipe)
26909 12:24:30.544112 futex(0x7f3cf94a27ec, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
24172 12:24:30.544118 futex(0x7f3cf94a27ec, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
26909 12:24:30.544122 <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable)
24172 12:24:30.544125 <... futex resumed>) = 0
24172 12:24:30.544132 mkdir("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/byte", 0777 <unfinished ...>
26909 12:24:30.544138 futex(0x7f3cf94a289c, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
24172 12:24:30.544141 <... mkdir resumed>) = -1 EEXIST (File exists)
24172 12:24:30.544151 madvise(0x7f3cf8647000, 4096, MADV_FREE) = 0
24172 12:24:30.544166 madvise(0x7f3cf8649000, 4096, MADV_FREE) = 0
24172 12:24:30.544180 stat("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/byte/dune__exe__Config.cmi", {st_mode=S_IFREG|0444, st_size=425, ...}) = 0
24172 12:24:30.544196 stat("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/byte/dune__exe__Config.cmo", {st_mode=S_IFREG|0444, st_size=3913, ...}) = 0
24172 12:24:30.544213 stat("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/byte/dune__exe__Config.cmt", {st_mode=S_IFREG|0444, st_size=8219, ...}) = 0
24172 12:24:30.544229 madvise(0x7f3cf864f000, 4096, MADV_FREE) = 0
24172 12:24:30.544246 mkdir("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/native", 0777) = -1 EEXIST (File exists)
24172 12:24:30.544266 madvise(0x7f3cf84eb000, 4096, MADV_FREE) = 0
24172 12:24:30.544282 stat("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/native/dune__exe__Config.cmx", {st_mode=S_IFREG|0444, st_size=2539, ...}) = 0
24172 12:24:30.544298 stat("_build/default/duniverse/eqaf.0.9/config/.config.eobjs/native/dune__exe__Config.o", {st_mode=S_IFREG|0444, st_size=8192, ...}) = 0
24172 12:24:30.544313 madvise(0x7f3cf84ed000, 4096, MADV_FREE) = 0
24172 12:24:30.544419 mkdir("_build/default/duniverse/base64.3.5.0/config", 0777) = -1 EEXIST (File exists)
24172 12:24:30.544439 madvise(0x7f3cf904b000, 4096, MADV_FREE) = 0
24172 12:24:30.544456 madvise(0x7f3cf904d000, 4096, MADV_FREE) = 0
24172 12:24:30.544471 stat("_build/default/duniverse/base64.3.5.0/config/config.exe", {st_mode=S_IFREG|0555, st_size=3656232, ...}) = 0
24172 12:24:30.544489 madvise(0x7f3cf8882000, 4096, MADV_FREE) = 0
24172 12:24:30.544509 mkdir("_build/default/duniverse/base64.3.5.0/config", 0777) = -1 EEXIST (File exists)
24172 12:24:30.544528 madvise(0x7f3cf8884000, 4096, MADV_FREE) = 0
24172 12:24:30.544542 madvise(0x7f3cf8eda000, 4096, MADV_FREE) = 0
24172 12:24:30.544558 stat("_build/default/duniverse/base64.3.5.0/config/which-unsafe-file", {st_mode=S_IFREG|0444, st_size=16, ...}) = 0
24172 12:24:30.544576 madvise(0x7f3cf8edc000, 4096, MADV_FREE) = 0
24172 12:24:30.544594 open("_build/default/duniverse/base64.3.5.0/config/which-unsafe-file", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>
24172 12:24:30.544617 fcntl(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>, F_SETFD, FD_CLOEXEC) = 0
24172 12:24:30.544637 lseek(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>, 0, SEEK_CUR) = 0
24172 12:24:30.544654 lseek(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>, 0, SEEK_END) = 16
24172 12:24:30.544670 lseek(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>, 0, SEEK_SET) = 0
24172 12:24:30.544685 read(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>, "unsafe_stable.ml", 65536) = 16
24172 12:24:30.544702 read(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>, "", 65536) = 0
24172 12:24:30.544718 close(12<_build/default/duniverse/base64.3.5.0/config/which-unsafe-file>) = 0
24172 12:24:30.544751 mkdir("_build/default/duniverse/eqaf.0.9/config", 0777) = -1 EEXIST (File exists)
24172 12:24:30.544771 madvise(0x7f3cf810a000, 4096, MADV_FREE) = 0
24172 12:24:30.544791 stat("_build/default/duniverse/eqaf.0.9/config/config.exe", {st_mode=S_IFREG|0555, st_size=3656456, ...}) = 0
24172 12:24:30.544810 madvise(0x7f3cf8bf3000, 4096, MADV_FREE) = 0
24172 12:24:30.544830 mkdir("_build/default/duniverse/eqaf.0.9/config", 0777) = -1 EEXIST (File exists)
24172 12:24:30.544848 madvise(0x7f3cf8bf5000, 4096, MADV_FREE) = 0
24172 12:24:30.544861 madvise(0x7f3cf9041000, 4096, MADV_FREE) = 0
24172 12:24:30.544875 stat("_build/default/duniverse/eqaf.0.9/config/which-unsafe-file", {st_mode=S_IFREG|0444, st_size=16, ...}) = 0
24172 12:24:30.544892 madvise(0x7f3cf8647000, 4096, MADV_FREE) = 0
24172 12:24:30.544909 open("_build/default/duniverse/eqaf.0.9/config/which-unsafe-file", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>
24172 12:24:30.544927 fcntl(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>, F_SETFD, FD_CLOEXEC) = 0
24172 12:24:30.544946 lseek(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>, 0, SEEK_CUR) = 0
24172 12:24:30.544961 lseek(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>, 0, SEEK_END) = 16
24172 12:24:30.544976 lseek(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>, 0, SEEK_SET) = 0
24172 12:24:30.544991 read(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>, "unsafe_stable.ml", 65536) = 16
24172 12:24:30.545007 read(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>, "", 65536) = 0
24172 12:24:30.545022 close(12<_build/default/duniverse/eqaf.0.9/config/which-unsafe-file>) = 0
24172 12:24:30.545051 futex(0x7f3cf94c589c, FUTEX_WAKE_PRIVATE, 1) = 1
26908 12:24:30.545061 <... futex resumed>) = 0
24172 12:24:30.545064 futex(0x7f3cf94a289c, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
26908 12:24:30.545068 futex(0x7f3cf94c583c, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
24172 12:24:30.545072 <... futex resumed>) = 1
26909 12:24:30.545074 <... futex resumed>) = 0
24172 12:24:30.545077 futex(0x7f3cf94c583c, FUTEX_WAKE_PRIVATE, 1) = 1
26909 12:24:30.545087 futex(0x1cd4354, FUTEX_WAIT_PRIVATE, 2147483664, NULL <unfinished ...>
26908 12:24:30.545090 <... futex resumed>) = 0
24172 12:24:30.545093 futex(0x1cd4354, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
26909 12:24:30.545096 <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable)
24172 12:24:30.545100 <... futex resumed>) = 0
26908 12:24:30.545102 futex(0x1cd4354, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
24172 12:24:30.545106 write(11<UNIX-STREAM:[133385->136255,"_build/.rpc/dune"]>, "((2:id((4:poll(4:auto1:0))(1:i1:"..., 115 <unfinished ...>
26909 12:24:30.545112 futex(0x7f3cf94a283c, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
24172 12:24:30.545117 <... write resumed>) = -1 EPIPE (Broken pipe)
26908 12:24:30.545120 <... futex resumed>) = 0
24172 12:24:30.545123 --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=24172, si_uid=1000} ---
26908 12:24:30.545128 munmap(0x7f3cf9746000, 36864) = ?
24177 12:24:30.545141 <... rt_sigtimedwait resumed> <unfinished ...>) = ?
24179 12:24:30.545146 <... select resumed> <unfinished ...>) = ?
24173 12:24:30.545148 <... nanosleep resumed> <unfinished ...>) = ?
26909 12:24:30.545151 <... futex resumed>) = ?
26908 12:24:30.545205 +++ killed by SIGPIPE +++
24179 12:24:30.545209 +++ killed by SIGPIPE +++
26909 12:24:30.545211 +++ killed by SIGPIPE +++
24178 12:24:30.545212 <... futex resumed>) = ?
24177 12:24:30.545214 +++ killed by SIGPIPE +++
24176 12:24:30.545216 <... select resumed> <unfinished ...>) = ?
24174 12:24:30.545218 <... select resumed> <unfinished ...>) = ?
24173 12:24:30.545220 +++ killed by SIGPIPE +++
24178 12:24:30.545255 +++ killed by SIGPIPE +++
24174 12:24:30.545299 +++ killed by SIGPIPE +++
24176 12:24:30.564746 +++ killed by SIGPIPE +++
24172 12:24:30.564758 +++ killed by SIGPIPE +++