Keno Fischer

Segfault in libamdhip

6

``` julia> a_d = ROCArray(a) 32-element ROCVector{Float64}: free(): invalid pointer signal (6): Aborted in expression starting at none:0 gsignal at /usr/lib/libc.so.6 (unknown line) abort at /usr/lib/libc.so.6 (unknown line) __libc_message at...

Fix checksumming in the presence of large, mostly-zero buffers.

4

Tools like asan allocate large regions of memory (multi-TB) that are generally sparsely allocated using demand-paging. Currently, when checksumming a process that has such regions, we attempt to read the...

Fix replay divergence with LeakSanitizer

2

LeakSanitizer reads all writable memory regions of loaded shared libraries to find any pointer references that are still live at the end of the process (in order to be able...

Consider keeping around open fds for all files considered immutable

1

We're pretty good about not relying on files being kept on disk through several strategies (btrfs cloning, hardlinking, etc.). However, when faced with unknown user code, it happens every once...

Redesign syscallbuf to always unwind on interruption

7

This is a major redesign of the syscallbuf code with the goal of establishing the invariant that we never switch away from a tracee while it's in the syscallbuf code....

Replay failed with "Expected syscall_bp_vm to be clear"

25

In trace `julia-9` from https://buildkite.com/organizations/julialang/pipelines/julia-master/builds/13170/jobs/01819131-f9a7-48e4-926f-23e48419c663/artifacts/018191c4-b7b8-461b-97c8-6f6f44bfc49f, we have when attempting to replay: ``` [FATAL src/ReplaySession.cc:632:enter_syscall()] (task 14658 (rec:1978) at time 2968298) -> Assertion `false' failed to hold. Expected syscall_bp_vm to be...

Consider kernel patch for AMD CPUID masking feature

1

AMD CPUs have two MSRs (MSRC001_1004 and MSRC001_1005) [1] that allow resetting bits in the 0x1 and 0x8000_0001 CPUID leaves. If this capability were exposed by the kernel, we would...

Intermittent failure in `mutex_pi_stress`

11

Just saw this on Anubis: ``` [FATAL /data/keno/rr/src/RecordSession.cc:1506:process_syscall_entry() errno: SUCCESS] (task 50829 (rec:50829) at time 20260) -> Assertion `t->desched_rec() || is_rrcall_notify_syscall_hook_exit_syscall( t->regs().original_syscallno(), t->arch()) || t->ip() == t->vm() ->privileged_traced_syscall_ip() .increment_by_syscall_insn_length(t->arch())' failed...

CI: Intermittent Failure in unexpected_exit_pid_ns

5

``` [FATAL /cache/build/exclusive-amdci3-0/julialang/rr/src/PerfCounters.cc:630:read_ticks()] (task 105315 (rec:103563) at time 222) -> Assertion `!counting_period || interrupt_val

CI: Intermittent failure in cont_race

33

E.g. - https://buildkite.com/julialang/rr/builds/191#eab915ff-919f-4167-98c2-dc592a739804 - https://buildkite.com/julialang/rr/builds/197#72075042-cf0c-4ea5-bdaf-627e7d37566a - https://buildkite.com/julialang/rr/builds/194#505a91bf-d491-41b1-98df-c26f46887da2