Please backport b8e753128ed074 (exit: Sleep at TASK_IDLE when waiting for application core dump) to < 6.12

Please backport b8e753128ed074 (exit: Sleep at TASK_IDLE when waiting for application core dump) to < 6.12

[Paul Menzel]

Dear Linux folks,


I am forwarding a backport request from SONiC Linux kernel [1]. It’d be 
great if you could apply commit b8e753128ed074fcb48e9ceded940752f6b1c19f 
[2] to Linux 6.1 and older.

> 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.


Kind regards,

Paul


[1]: https://github.com/sonic-net/sonic-linux-kernel/pull/575/
[2]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b8e753128ed074fcb48e9ceded940752f6b1c19f

Re: Please backport b8e753128ed074 (exit: Sleep at TASK_IDLE when waiting for application core dump) to < 6.12

[Greg KH]

On Wed, May 13, 2026 at 03:24:28PM +0200, Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> I am forwarding a backport request from SONiC Linux kernel [1]. It’d be
> great if you could apply commit b8e753128ed074fcb48e9ceded940752f6b1c19f [2]
> to Linux 6.1 and older.
> 
> > 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.
> 
> 
> Kind regards,
> 
> Paul
> 
> 
> [1]: https://github.com/sonic-net/sonic-linux-kernel/pull/575/
> [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b8e753128ed074fcb48e9ceded940752f6b1c19f
> 

Now queued up, thanks.

greg k-h