Backport upstream fix for khungtaskd panic on stalled coredumps#575
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On Linux 6.1, coredump_task_exit() parks sibling threads in
TASK_UNINTERRUPTIBLE|TASK_FREEZABLE while one thread of the group writes the core file.
Under sustained memory pressure the dump can take longer
than kernel.hung_task_timeout_secs, at which point khungtaskd flags the
parked siblings and (with hung_task_panic=1) panics the box.
Backport mainline v6.12 commit b8e753128ed0 ("exit: Sleep at TASK_IDLE
when waiting for application core dump") which switches that wait to
TASK_IDLE|TASK_FREEZABLE so the watchdog skips it.
Signed-off-by: manish1 <manish1@arista.com>
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On Linux 6.1, coredump_task_exit() parks sibling threads in TASK_UNINTERRUPTIBLE|TASK_FREEZABLE while one thread of the group writes the core file. Under sustained memory pressure the dump can take longer than kernel.hung_task_timeout_secs, at which point khungtaskd flags the parked siblings and (with hung_task_panic=1) panics the box.
Backport mainline v6.12 commit b8e753128ed0 which switches that wait to TASK_IDLE|TASK_FREEZABLE so the watchdog skips it.