DragonFlyBSD

Since the upgrade from 2.12 to master last friday, I see this panic:
assertion "(c->c_flags & (CALLOUT_PENDING|CALLOUT_ACTIVE)) == 0"
failed in callout_stop_sync at /usr/src/sys/kern/kern_timeout.c:519
regularly.

Have just seen this panic again after an update to v2.13.0.964.g2c5c4
and about 1h uptime.

:Issue #2269 has been updated by G. Isenmann.
:
:Since the upgrade from 2.12 to master last friday, I see this panic:
:assertion "(c->c_flags & (CALLOUT_PENDING|CALLOUT_ACTIVE)) == 0"
:failed in callout_stop_sync at /usr/src/sys/kern/kern_timeout.c:519
:regularly.
:
:#5 0xffffffff802dbeb7 in callout_stop_sync (c=0xffffffe065c82990)
: at /usr/src/sys/kern/kern_timeout.c:519
:#6 0xffffffff802dadd0 in sys_setitimer (uap=0xffffffe066028b68)
: at /usr/src/sys/kern/kern_time.c:762
:
:Get dump from https://84.73.12.43/crash/core25.txz

Thanks for the dump.  I've committed what I believe should be a
    workable fix for the callout race being run from the itimer.

commit 7881367cc47b64348df063a9c6962909d1f1eb71

:I'm still experiencing regularly issue 2092, it could be related to it as ahci_ata_cmd_done() calls callout_stop_sync() (which panic comes from)

This is a more difficult problem.  I have committed what I believe
    should fix the problem but you need to test it.

commit bb79834d4440c42ded824722460ae008a58ecf26

Please try updating to the latest master ('git log' in /usr/src to
    make sure you got both commits), and continue testing.

At the moment you seem to be able to reproduce these bugs the quickest
    so please get back to us as to whether the commits fixed one or both
    problems.

Thanks for the bug report!

-Matt
                    Matthew Dillon

The dump was from Magliano Andrea, but I have seen this panic on one
system at home six times last week.

No panic over the weekend with the latest master. Will again put some
load on this machine, when I get home today.

No panic last night.

Haven't seen this panic with above fix, while using the affected system regularly during the last five weeks.