git: kern: skip module shutdown handlers on panic

[Aaron LI]

commit b2395074a5382b9e20d86353eeab0014a8dc9b52
Author: David Bidner <david at crap.solutions>
Date:   Thu Oct 15 19:24:37 2026 +0200

    kern: skip module shutdown handlers on panic
    
    module_shutdown() is a shutdown_post_sync handler, so it also runs on the
    panic path after the panicking CPU has stopped the other CPUs.  Some
    MOD_SHUTDOWN handlers block on kernel threads that cannot run once their
    CPU is stopped: vn calls disk_destroy(), and disk_msg_send_sync() then
    waits forever for the disk_msg_core thread.  The machine hangs after
    "Dump complete" and never reboots.
    
    Skip the module shutdown handlers on a panic, as resettodr_on_shutdown()
    and shutdown_kproc() already do.  The dump is already written when this
    handler runs.
    
    Reproduced in a QEMU/NVMM guest: panic + dump with
    hw.acpi.handle_reboot=1 hangs at "Dump complete" on SMP and reboots on a
    single CPU.  With this change the guest reboots with
    hw.acpi.handle_reboot 1 and 0, with and without a dump.
    
    Bug: https://bugs.dragonflybsd.org/issues/3450

Summary of changes:
 sys/kern/kern_module.c | 4 ++++
 1 file changed, 4 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b2395074a5382b9e20d86353eeab0014a8dc9b52


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