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NixOS RISC-V

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NixOS on RISC-V https://wiki.nixos.org/wiki/RISC-V https://pad.lassul.us/NixOS-riscv64-linux https://github.com/orgs/NixOS/teams/risc-v66 Servers

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SenderMessageTime
11 Nov 2025
@rosscomputerguy:matrix.orgTristan RossUpdating bootstrap-tools fixed it21:58:28
@rosscomputerguy:matrix.orgTristan RossI guess we should make a new bootstrap-tools for riscv64-linux.... It has been a year since we did it last.21:59:33
@rosscomputerguy:matrix.orgTristan RossOh, updating bootstrap-tools fixes it enough that the bootstrap-tools derivation builds but GCC is still broken22:21:16
12 Nov 2025
@rosscomputerguy:matrix.orgTristan Ross 
roma@mu-gundam:~/nixpkgs$ strace /nix/store/95y6xmfgcvgxjmba9xm6ccxxnf6i61pw-bootstrap-tools/bin
execve("/nix/store/95y6xmfgcvgxjmba9xm6ccxxnf6i61pw-bootstrap-tools/bin", ["/nix/store/95y6xmfgcvgxjmba9xm6c"...], 0x7fffe5cec8b0 /* 30 vars */) = -1 EACCES (Permission denied)
strace: exec: Permission denied
+++ exited with 1 +++

So confusing...

05:46:18
@rosscomputerguy:matrix.orgTristan Ross * 
roma@mu-gundam:~/nixpkgs$ strace /nix/store/95y6xmfgcvgxjmba9xm6ccxxnf6i61pw-bootstrap-tools/bin/gcc
execve("/nix/store/95y6xmfgcvgxjmba9xm6ccxxnf6i61pw-bootstrap-tools/bin/gcc", ["/nix/store/95y6xmfgcvgxjmba9xm6c"...], 0x7fffe09ae8a0 /* 30 vars */) = -1 EPERM (Operation not p)
+++ killed by SIGSEGV +++
Segmentation fault (core dumped)

So confusing...

05:46:55
@joerg:thalheim.ioMic92 @rosscomputerguy:matrix.org: is your ld.so broken potentially? 05:49:44
@rosscomputerguy:matrix.orgTristan RossIdk05:49:56
@rosscomputerguy:matrix.orgTristan RossIt would mean bootstrap-tools's is broken, right?05:50:17
@rosscomputerguy:matrix.orgTristan Ross 
roma@mu-gundam:~/nixpkgs$ /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/lib/ld-linux-riscv64-lp64d.so.1 /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-toolc/gcc
/nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/bin/gcc: error while loading shared libraries: /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/bin/gcc: failed to map segment from shared object
05:50:54
@rosscomputerguy:matrix.orgTristan Ross * 
roma@mu-gundam:~/nixpkgs$ /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/lib/ld-linux-riscv64-lp64d.so.1 /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-toolc/bin/gcc
/nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/bin/gcc: error while loading shared libraries: /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/bin/gcc: failed to map segment from shared object
05:51:04
@rosscomputerguy:matrix.orgTristan RossI get the same error if I try using Ubuntu's ld.so on GCC.05:52:22
@joerg:thalheim.ioMic92Try LD_DEBUG=all05:53:35
@rosscomputerguy:matrix.orgTristan Ross

I get 1 extra line:

      6557:     file=/nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/bin/gcc [0];  generating link map
05:54:01
@joerg:thalheim.ioMic92Strace on your ld.so? 05:54:44
@joerg:thalheim.ioMic92I think there might be something your gcc tries to map to an fixed address space adress that the kernel even before staring ld.so outrightly refuses05:55:56
@joerg:thalheim.ioMic92* I think there might be something your gcc tries to map to an fixed address space adress that the kernel even before starting ld.so outrightly refuses05:56:15
@rosscomputerguy:matrix.orgTristan Ross 
roma@mu-gundam:~/nixpkgs$ strace -E LD_DEBUG=all /nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/lib/ld-linux-riscv64-lp64d.so.1 /nix/store/kg61gdq4svvph0c4pcsf867rc
execve("/nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/lib/ld-linux-riscv64-lp64d.so.1", ["/nix/store/kg61gdq4svvph0c4pcsf8"..., "/nix/store/kg61gdq4svvph0c4pcsf8"0
brk(NULL)                               = 0x7fff84224000
openat(AT_FDCWD, "/nix/store/kg61gdq4svvph0c4pcsf867r8nkbiqs7-bootstrap-tools/bin/gcc", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\2\0\363\0\1\0\0\0\230\312\2\0\0\0\0\0"..., 832) = 832
getpid()                                = 6665
writev(2, [{iov_base="      6665:\t", iov_len=12}, {iov_base="file=", iov_len=5}, {iov_base="/nix/store/kg61gdq4svvph0c4pcsf8"..., iov_len=67}, {iov_base=" [", iov_len=2}, {iovp
) = 111
mmap(0xf000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = -1 EPERM (Operation not permitted)
close(3)                                = 0
writev(2, [{iov_base="/nix/store/kg61gdq4svvph0c4pcsf8"..., iov_len=67}, {iov_base=": ", iov_len=2}, {iov_base="error while loading shared libra"..., iov_len=36}, {iov_base=": t
) = 217
exit_group(127)                         = ?
+++ exited with 127 +++
05:56:34
@rosscomputerguy:matrix.orgTristan RossBest I can get out of the UART atm05:56:46
@joerg:thalheim.ioMic92 mmap(0xf000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = -1 EPERM (Operation not permitted) 05:57:53
@joerg:thalheim.ioMic92Now do readelf and look for suspicious addresses. 05:58:18

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