Here’s another example from berlin today: --8<---------------cut here---------------start------------->8--- ludo@berlin$ sudo guix processes SessionPID: 38649 ClientPID: 38611 ClientCommand: /gnu/store/7x9lrzs2l00mfcr3ya7hg1i06i7lq9pd-profile/bin/guile \ /home/mbakke/guix/master/scripts/guix build --no-grafts --keep-going --max-silent-time=36000 --timeout=216000 -s armhf-linux nmoldyn r-msnid r-yamss netcdf-fortran python-netcdf4 LockHeld: /gnu/store/v6hcm1gvv3gdfbnq6cd4kn1i6ip3y74s-netcdf-fortran-4.4.4.lock LockHeld: /gnu/store/ydxl0ws9kk6ix58m99ib7qhi157yq49h-r-msnid-1.18.1.lock ChildProcess: 33181: /gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile \ /gnu/store/vyhfp0gj4rx74yw0ybalzj8bvmqgp9pr-guix-1.0.1-4.c902458/bin/.guix-real offload x86_64-linux 36000 1 216000 [...] SessionPID: 44043 ClientPID: 44023 ClientCommand: /gnu/store/7x9lrzs2l00mfcr3ya7hg1i06i7lq9pd-profile/bin/guile \ /home/mbakke/guix/master/scripts/guix build --no-grafts --keep-going --max-silent-time=36000 --timeout=216000 -s armhf-linux netcdf-fortran r-msnid nmoldyn r-yamss LockHeld: /gnu/store/69jjabypcpx83482rh3yp4a9ncjimw6b-r-yamss-1.10.0.lock LockHeld: /gnu/store/ibdbwxb1i8yal8ilqxxgnzh6bxpinic1-nmoldyn-3.0.11.lock ChildProcess: 48997: /gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile \ /gnu/store/vyhfp0gj4rx74yw0ybalzj8bvmqgp9pr-guix-1.0.1-4.c902458/bin/.guix-real offload x86_64-linux 36000 1 216000 ludo@berlin ~$ sudo strace -p 38649 -e openat,fcntl strace: Process 38649 attached openat(AT_FDCWD, "/gnu/store/ibdbwxb1i8yal8ilqxxgnzh6bxpinic1-nmoldyn-3.0.11.lock", O_RDWR|O_CREAT, 0600) = 10 fcntl(10, F_GETFD) = 0 fcntl(10, F_SETFD, FD_CLOEXEC) = 0 fcntl(10, F_SETLK, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = -1 EAGAIN (Resource temporarily unavailable) openat(AT_FDCWD, "/gnu/store/69jjabypcpx83482rh3yp4a9ncjimw6b-r-yamss-1.10.0.lock", O_RDWR|O_CREAT, 0600) = 10 fcntl(10, F_GETFD) = 0 fcntl(10, F_SETFD, FD_CLOEXEC) = 0 fcntl(10, F_SETLK, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = -1 EAGAIN (Resource temporarily unavailable) ^Cstrace: Process 38649 detached ludo@berlin ~$ sudo strace -p 44043 -e openat,fcntl strace: Process 44043 attached openat(AT_FDCWD, "/gnu/store/ydxl0ws9kk6ix58m99ib7qhi157yq49h-r-msnid-1.18.1.lock", O_RDWR|O_CREAT, 0600) = 10 fcntl(10, F_GETFD) = 0 fcntl(10, F_SETFD, FD_CLOEXEC) = 0 fcntl(10, F_SETLK, {l_type=F_WRLCK, l_whence=SEEK_SET, l_start=0, l_len=0}) = -1 EAGAIN (Resource temporarily unavailable) ^Cstrace: Process 44043 detached --8<---------------cut here---------------end--------------->8--- A very palpable deadlock. Ludo’.