On (20/08/26 10:45), John Ogness wrote: > On 2020-08-24, John Ogness <john.ogness@xxxxxxxxxxxxx> wrote: > > @@ -1157,6 +1431,14 @@ bool prb_reserve(struct prb_reserved_entry *e, struct printk_ringbuffer *rb, > > goto fail; > > } > > > > + /* > > + * New data is about to be reserved. Once that happens, previous > > + * descriptors are no longer able to be extended. Finalize the > > + * previous descriptor now so that it can be made available to > > + * readers (when committed). > > + */ > > + desc_finalize(desc_ring, DESC_ID(id - 1)); > > + > > d = to_desc(desc_ring, id); > > > > /* > > Apparently this is not enough to guarantee that past descriptors are > finalized. I am able to reproduce a scenario where the finalization of a > certain descriptor never happens. That leaves the descriptor permanently > in the reserved queried state, which prevents any new records from being > created. I am investigating. Good to know. I also run into problems: - broken dmesg (and broken journalctl -f /dev/kmsg poll) and broken syslog read $ strace dmesg ... openat(AT_FDCWD, "/dev/kmsg", O_RDONLY|O_NONBLOCK) = 3 lseek(3, 0, SEEK_DATA) = 0 read(3, 0x55dda8c240a8, 8191) = -1 EAGAIN (Resource temporarily unavailable) close(3) = 0 syslog(10 /* SYSLOG_ACTION_SIZE_BUFFER */) = 524288 mmap(NULL, 528384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f43ea847000 syslog(3 /* SYSLOG_ACTION_READ_ALL */, "", 524296) = 0 munmap(0x7f43ea847000, 528384) = 0 ... -ss _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
