Comments (2)
- You would need to make a custom change to the Nanos kernel and rebuild the kernel; more specifically, you can add a call to
dump_context(current->context);
in the futex() function at https://github.com/nanovms/nanos/blob/master/src/unix/futex.c#L347. This would print a frame trace and stack trace of the user program when it invoked the FUTEX_WAKE_BITSET operation. If you add the "ingest_program_symbols" flag to your Ops configuration file (as in{ "Debugflags":["ingest_program_symbols"] }
, see https://docs.ops.city/ops/configuration), the trace will include the program function names (unless the program executable has been stripped of the ELF symbol names); however, if the futex operation came from a dynamically linked library, you won't see the function names from that library. - The bit mask functionality for futex wait and wake operations is currently not implemented in the kernel, but it is definitely possible to add it in the future.
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´Thank you, that was very helpful, I was able to remove calls to FUTEX_WAKE_BITSET.
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Related Issues (20)
- issue(smp): tokio-rs/sled deadlock (probable) on cpu count > 1 HOT 9
- issue(fs): assertion !frame_is_full(ctx->frame) failed at /nanos/src/kernel/mutex.c:109 (IP 0xffffffff800460b4) HOT 2
- issue: assertion enqueue(pn->dirty_commits, sh) failed at .../pagecache.c:1088 ... in pagecache_commit_dirty_node(); halt HOT 11
- issue(unix_clock): clock_getcpuclockid and clock_getres unexpected behavior HOT 3
- issue: assertion w->retval++ < (w->poll_fds->length / sizeof(struct pollfd)) failed at ../unix/poll.c:939 (IP 0xf..) in poll_notify(); halt HOT 7
- arm64 golang hello-wold fails to run on MacBook Air M1 HOT 2
- issue: assertion staging->end + min < size failed at /nanos/src/fs/tlog.c:427 in log_write_internal() HOT 1
- allow passing in network settings via kernel boot args for firecracker
- Much Slower Transfer Rate for HTTP Requests Compared to Native HOT 11
- Is the `memfd_create` syscall supported? HOT 4
- cannot enable executable stack as shared object requires: Permission denied HOT 3
- Error in Load Testing with MySQL in Firecracker Environment - Buffer Size Issue HOT 11
- accept_tcp_from_lwip error: queue overrun; shouldn't happen with lwIP listen backlog
- block an IP at the kernel level? HOT 10
- Build Problems: Stage 2 exceeds 64KB HOT 4
- Support Azure VM Agent HOT 3
- Scheduled Task Stops Prematurely in Java in Firecracker MicroVM HOT 4
- question(gcp/network/dhcp): sporadic failures to obtain internal IPv4 from dhcp on GCP
- Failed to integrate ollama in Nanos HOT 4
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