Re: [PATCH] kernel: add panic_on_taint
> On May 7, 2020, at 7:36 PM, Rafael Aquini wrote: > > On Thu, May 07, 2020 at 07:07:20PM -0400, Qian Cai wrote: >> >> >>> On May 7, 2020, at 6:15 PM, Rafael Aquini wrote: >>> >>> It's a reasonable and self-contained feature that we have a valid use for. >>> I honestly fail to see it causing that amount of annoyance as you are >>> suggesting here. >> >> It is not a big trouble yet, but keeping an obsolete patch that not very >> straightforward to figure out that it will be superseded by the >> panic_on_taint patch will only cause more confusion the longer it has stayed >> in linux-next. >> >> The thing is that even if you can’t get this panic_on_taint (the superior >> solution) patch accepted for some reasons, someone else could still work on >> it until it get merged. >> >> Thus, I failed to see any possibility we will go back to the inferior >> solution (mm-slub-add-panic_on_error-to-the-debug-facilities.patch) by all >> means. >> > > There are plenty of examples of things being added, changed, and > removed in -next. IOW, living in a transient state. I think it's > a reasonable compromise to keep it while the other one is beind > ironed out. > > The fact that you prefer one solution to another doesn't > invalidate the one you dislike. As far I can tell, the bar of the other core subsystems are quite high even for linux-next. People have been voiced over and over again to urge Andrew not picking up patches so eagerly, but I will save that discussion for the next time. Anyway, thanks for working for the panic_on_taint patch. I believe it could be useful for all testing agents to catch those bad pages earlier.
Re: [PATCH] kernel: add panic_on_taint
On Thu, May 07, 2020 at 07:07:20PM -0400, Qian Cai wrote: > > > > On May 7, 2020, at 6:15 PM, Rafael Aquini wrote: > > > > It's a reasonable and self-contained feature that we have a valid use for. > > I honestly fail to see it causing that amount of annoyance as you are > > suggesting here. > > It is not a big trouble yet, but keeping an obsolete patch that not very > straightforward to figure out that it will be superseded by the > panic_on_taint patch will only cause more confusion the longer it has stayed > in linux-next. > > The thing is that even if you can’t get this panic_on_taint (the superior > solution) patch accepted for some reasons, someone else could still work on > it until it get merged. > > Thus, I failed to see any possibility we will go back to the inferior > solution (mm-slub-add-panic_on_error-to-the-debug-facilities.patch) by all > means. > There are plenty of examples of things being added, changed, and removed in -next. IOW, living in a transient state. I think it's a reasonable compromise to keep it while the other one is beind ironed out. The fact that you prefer one solution to another doesn't invalidate the one you dislike. Cheers, -- Rafael
Re: [PATCH] kernel: add panic_on_taint
> On May 7, 2020, at 6:15 PM, Rafael Aquini wrote: > > It's a reasonable and self-contained feature that we have a valid use for. > I honestly fail to see it causing that amount of annoyance as you are > suggesting here. It is not a big trouble yet, but keeping an obsolete patch that not very straightforward to figure out that it will be superseded by the panic_on_taint patch will only cause more confusion the longer it has stayed in linux-next. The thing is that even if you can’t get this panic_on_taint (the superior solution) patch accepted for some reasons, someone else could still work on it until it get merged. Thus, I failed to see any possibility we will go back to the inferior solution (mm-slub-add-panic_on_error-to-the-debug-facilities.patch) by all means.
Re: [PATCH] kernel: add panic_on_taint
On Thu, May 07, 2020 at 06:05:27PM -0400, Qian Cai wrote: > > > > On May 7, 2020, at 4:42 PM, Rafael Aquini wrote: > > > > On Wed, May 06, 2020 at 10:50:19PM -0400, Qian Cai wrote: > >> > >> > >>> On May 6, 2020, at 6:28 PM, Rafael Aquini wrote: > >>> > >>> Analogously to the introduction of panic_on_warn, this patch > >>> introduces a kernel option named panic_on_taint in order to > >>> provide a simple and generic way to stop execution and catch > >>> a coredump when the kernel gets tainted by any given taint flag. > >>> > >>> This is useful for debugging sessions as it avoids rebuilding > >>> the kernel to explicitly add calls to panic() or BUG() into > >>> code sites that introduce the taint flags of interest. > >>> Another, perhaps less frequent, use for this option would be > >>> as a mean for assuring a security policy (in paranoid mode) > >>> case where no single taint is allowed for the running system. > >> > >> Andrew, you can drop the patch below from -mm now because that one is now > >> obsolete, > >> > >> mm-slub-add-panic_on_error-to-the-debug-facilities.patch > >> > > Please, don't drop it yet. I'll send a patch to get rid of the bits, > > once this one gets accepted, if it gets accepted. > > Why do you ever want that obsolete patch even show up in linux-next to > potentailly waste other people/bots time to test it and develop things on top > of it? > It's a reasonable and self-contained feature that we have a valid use for. I honestly fail to see it causing that amount of annoyance as you are suggesting here.
Re: [PATCH] kernel: add panic_on_taint
> On May 7, 2020, at 4:42 PM, Rafael Aquini wrote: > > On Wed, May 06, 2020 at 10:50:19PM -0400, Qian Cai wrote: >> >> >>> On May 6, 2020, at 6:28 PM, Rafael Aquini wrote: >>> >>> Analogously to the introduction of panic_on_warn, this patch >>> introduces a kernel option named panic_on_taint in order to >>> provide a simple and generic way to stop execution and catch >>> a coredump when the kernel gets tainted by any given taint flag. >>> >>> This is useful for debugging sessions as it avoids rebuilding >>> the kernel to explicitly add calls to panic() or BUG() into >>> code sites that introduce the taint flags of interest. >>> Another, perhaps less frequent, use for this option would be >>> as a mean for assuring a security policy (in paranoid mode) >>> case where no single taint is allowed for the running system. >> >> Andrew, you can drop the patch below from -mm now because that one is now >> obsolete, >> >> mm-slub-add-panic_on_error-to-the-debug-facilities.patch >> > Please, don't drop it yet. I'll send a patch to get rid of the bits, > once this one gets accepted, if it gets accepted. Why do you ever want that obsolete patch even show up in linux-next to potentailly waste other people/bots time to test it and develop things on top of it?
Re: [PATCH] kernel: add panic_on_taint
On Wed, May 06, 2020 at 10:50:19PM -0400, Qian Cai wrote: > > > > On May 6, 2020, at 6:28 PM, Rafael Aquini wrote: > > > > Analogously to the introduction of panic_on_warn, this patch > > introduces a kernel option named panic_on_taint in order to > > provide a simple and generic way to stop execution and catch > > a coredump when the kernel gets tainted by any given taint flag. > > > > This is useful for debugging sessions as it avoids rebuilding > > the kernel to explicitly add calls to panic() or BUG() into > > code sites that introduce the taint flags of interest. > > Another, perhaps less frequent, use for this option would be > > as a mean for assuring a security policy (in paranoid mode) > > case where no single taint is allowed for the running system. > > Andrew, you can drop the patch below from -mm now because that one is now > obsolete, > > mm-slub-add-panic_on_error-to-the-debug-facilities.patch > Please, don't drop it yet. I'll send a patch to get rid of the bits, once this one gets accepted, if it gets accepted. -- Rafael
Re: [PATCH] kernel: add panic_on_taint
> On May 6, 2020, at 6:28 PM, Rafael Aquini wrote: > > Analogously to the introduction of panic_on_warn, this patch > introduces a kernel option named panic_on_taint in order to > provide a simple and generic way to stop execution and catch > a coredump when the kernel gets tainted by any given taint flag. > > This is useful for debugging sessions as it avoids rebuilding > the kernel to explicitly add calls to panic() or BUG() into > code sites that introduce the taint flags of interest. > Another, perhaps less frequent, use for this option would be > as a mean for assuring a security policy (in paranoid mode) > case where no single taint is allowed for the running system. Andrew, you can drop the patch below from -mm now because that one is now obsolete, mm-slub-add-panic_on_error-to-the-debug-facilities.patch
Re: [PATCH] kernel: add panic_on_taint
On 5/6/20 3:28 PM, Rafael Aquini wrote: > diff --git a/Documentation/admin-guide/kernel-parameters.txt > b/Documentation/admin-guide/kernel-parameters.txt > index 7bc83f3d9bdf..75c02c1841b2 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -3404,6 +3404,9 @@ > panic_on_warn panic() instead of WARN(). Useful to cause kdump > on a WARN(). > > + panic_on_taint panic() when the kernel gets tainted, if the taint > + flag being set matches with the assigned bitmask. > + Where is the bitmask assigned? I.e., maybe this text should be more like: panic_on_taint= and then the bits are explained. See e.g. panic= and panic_print= in this same file. > crash_kexec_post_notifiers > Run kdump after running panic-notifiers and dumping > kmsg. This only for the users who doubt kdump always -- ~Randy
Re: [PATCH] kernel: add panic_on_taint
On Wed, May 06, 2020 at 11:24:48PM +, Luis Chamberlain wrote: > On Wed, May 06, 2020 at 06:28:15PM -0400, Rafael Aquini wrote: > > Analogously to the introduction of panic_on_warn, this patch > > introduces a kernel option named panic_on_taint in order to > > provide a simple and generic way to stop execution and catch > > a coredump when the kernel gets tainted by any given taint flag. > > > > This is useful for debugging sessions as it avoids rebuilding > > the kernel to explicitly add calls to panic() or BUG() into > > code sites that introduce the taint flags of interest. > > Another, perhaps less frequent, use for this option would be > > as a mean for assuring a security policy (in paranoid mode) > > case where no single taint is allowed for the running system. > > > > Suggested-by: Qian Cai > > Signed-off-by: Rafael Aquini > > --- > > Documentation/admin-guide/kdump/kdump.rst | 10 ++ > > .../admin-guide/kernel-parameters.txt | 3 ++ > > Documentation/admin-guide/sysctl/kernel.rst | 36 +++ > > include/linux/kernel.h| 1 + > > kernel/panic.c| 7 > > kernel/sysctl.c | 7 > > 6 files changed, 64 insertions(+) > > > > diff --git a/Documentation/admin-guide/kdump/kdump.rst > > b/Documentation/admin-guide/kdump/kdump.rst > > index ac7e131d2935..de3cf6d377cc 100644 > > --- a/Documentation/admin-guide/kdump/kdump.rst > > +++ b/Documentation/admin-guide/kdump/kdump.rst > > @@ -521,6 +521,16 @@ will cause a kdump to occur at the panic() call. In > > cases where a user wants > > to specify this during runtime, /proc/sys/kernel/panic_on_warn can be set > > to 1 > > to achieve the same behaviour. > > > > +Trigger Kdump on add_taint() > > + > > + > > +The kernel parameter, panic_on_taint, calls panic() from within > > add_taint(), > > +whenever the value set in this bitmask matches with the bit flag being set > > +by add_taint(). This will cause a kdump to occur at the panic() call. > > +In cases where a user wants to specify this during runtime, > > +/proc/sys/kernel/panic_on_taint can be set to a respective bitmask value > > +to achieve the same behaviour. > > + > > Contact > > === > > > > diff --git a/Documentation/admin-guide/kernel-parameters.txt > > b/Documentation/admin-guide/kernel-parameters.txt > > index 7bc83f3d9bdf..75c02c1841b2 100644 > > --- a/Documentation/admin-guide/kernel-parameters.txt > > +++ b/Documentation/admin-guide/kernel-parameters.txt > > @@ -3404,6 +3404,9 @@ > > panic_on_warn panic() instead of WARN(). Useful to cause kdump > > on a WARN(). > > > > + panic_on_taint panic() when the kernel gets tainted, if the taint > > + flag being set matches with the assigned bitmask. > > + > > crash_kexec_post_notifiers > > Run kdump after running panic-notifiers and dumping > > kmsg. This only for the users who doubt kdump always > > diff --git a/Documentation/admin-guide/sysctl/kernel.rst > > b/Documentation/admin-guide/sysctl/kernel.rst > > index 0d427fd10941..5b880102f2e3 100644 > > --- a/Documentation/admin-guide/sysctl/kernel.rst > > +++ b/Documentation/admin-guide/sysctl/kernel.rst > > @@ -658,6 +658,42 @@ a kernel rebuild when attempting to kdump at the > > location of a WARN(). > > = > > > > > > +panic_on_taint > > +== > > + > > +Bitmask for calling panic() in the add_taint() path. > > +This is useful to avoid a kernel rebuild when attempting to > > +kdump at the insertion of any specific TAINT flags. > > +When set to 0 (default) add_taint() default behavior is maintained. > > + > > +== > > +bit 0 TAINT_PROPRIETARY_MODULE > > +bit 1 TAINT_FORCED_MODULE > > +bit 2 TAINT_CPU_OUT_OF_SPEC > > +bit 3 TAINT_FORCED_RMMOD > > +bit 4 TAINT_MACHINE_CHECK > > +bit 5 TAINT_BAD_PAGE > > +bit 6 TAINT_USER > > +bit 7 TAINT_DIE > > +bit 8 TAINT_OVERRIDDEN_ACPI_TABLE > > +bit 9 TAINT_WARN > > +bit 10 TAINT_CRAP > > +bit 11 TAINT_FIRMWARE_WORKAROUND > > +bit 12 TAINT_OOT_MODULE > > +bit 13 TAINT_UNSIGNED_MODULE > > +bit 14 TAINT_SOFTLOCKUP > > +bit 15 TAINT_LIVEPATCH > > +bit 16 TAINT_AUX > > +bit 17 TAINT_RANDSTRUCT > > +bit 18 TAINT_FLAGS_COUNT > > +== > > + > > +So, for example, to panic if the kernel gets tainted due to > > +occurrences of bad pages and/or machine check errors, a user can:: > > + > > + echo 48 > /proc/sys/kernel/panic_on_taint > > + > > + > > panic_print > > === > > > > diff --git a/include/linux/kernel.h b/include/linux/kernel.h > > index 9b7a8d74a9d6..518b9fd381c2 100644 > > --- a/include/linux/kernel.h > > +++ b/include/linux/kernel.h > > @@ -528,6 +528,7 @@ extern int panic_on_oops; > > extern int panic_on_unrecovered_nmi; > > extern int
Re: [PATCH] kernel: add panic_on_taint
On Wed, May 06, 2020 at 06:28:15PM -0400, Rafael Aquini wrote: > Analogously to the introduction of panic_on_warn, this patch > introduces a kernel option named panic_on_taint in order to > provide a simple and generic way to stop execution and catch > a coredump when the kernel gets tainted by any given taint flag. > > This is useful for debugging sessions as it avoids rebuilding > the kernel to explicitly add calls to panic() or BUG() into > code sites that introduce the taint flags of interest. > Another, perhaps less frequent, use for this option would be > as a mean for assuring a security policy (in paranoid mode) > case where no single taint is allowed for the running system. > > Suggested-by: Qian Cai > Signed-off-by: Rafael Aquini > --- > Documentation/admin-guide/kdump/kdump.rst | 10 ++ > .../admin-guide/kernel-parameters.txt | 3 ++ > Documentation/admin-guide/sysctl/kernel.rst | 36 +++ > include/linux/kernel.h| 1 + > kernel/panic.c| 7 > kernel/sysctl.c | 7 > 6 files changed, 64 insertions(+) > > diff --git a/Documentation/admin-guide/kdump/kdump.rst > b/Documentation/admin-guide/kdump/kdump.rst > index ac7e131d2935..de3cf6d377cc 100644 > --- a/Documentation/admin-guide/kdump/kdump.rst > +++ b/Documentation/admin-guide/kdump/kdump.rst > @@ -521,6 +521,16 @@ will cause a kdump to occur at the panic() call. In > cases where a user wants > to specify this during runtime, /proc/sys/kernel/panic_on_warn can be set to > 1 > to achieve the same behaviour. > > +Trigger Kdump on add_taint() > + > + > +The kernel parameter, panic_on_taint, calls panic() from within add_taint(), > +whenever the value set in this bitmask matches with the bit flag being set > +by add_taint(). This will cause a kdump to occur at the panic() call. > +In cases where a user wants to specify this during runtime, > +/proc/sys/kernel/panic_on_taint can be set to a respective bitmask value > +to achieve the same behaviour. > + > Contact > === > > diff --git a/Documentation/admin-guide/kernel-parameters.txt > b/Documentation/admin-guide/kernel-parameters.txt > index 7bc83f3d9bdf..75c02c1841b2 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -3404,6 +3404,9 @@ > panic_on_warn panic() instead of WARN(). Useful to cause kdump > on a WARN(). > > + panic_on_taint panic() when the kernel gets tainted, if the taint > + flag being set matches with the assigned bitmask. > + > crash_kexec_post_notifiers > Run kdump after running panic-notifiers and dumping > kmsg. This only for the users who doubt kdump always > diff --git a/Documentation/admin-guide/sysctl/kernel.rst > b/Documentation/admin-guide/sysctl/kernel.rst > index 0d427fd10941..5b880102f2e3 100644 > --- a/Documentation/admin-guide/sysctl/kernel.rst > +++ b/Documentation/admin-guide/sysctl/kernel.rst > @@ -658,6 +658,42 @@ a kernel rebuild when attempting to kdump at the > location of a WARN(). > = > > > +panic_on_taint > +== > + > +Bitmask for calling panic() in the add_taint() path. > +This is useful to avoid a kernel rebuild when attempting to > +kdump at the insertion of any specific TAINT flags. > +When set to 0 (default) add_taint() default behavior is maintained. > + > +== > +bit 0 TAINT_PROPRIETARY_MODULE > +bit 1 TAINT_FORCED_MODULE > +bit 2 TAINT_CPU_OUT_OF_SPEC > +bit 3 TAINT_FORCED_RMMOD > +bit 4 TAINT_MACHINE_CHECK > +bit 5 TAINT_BAD_PAGE > +bit 6 TAINT_USER > +bit 7 TAINT_DIE > +bit 8 TAINT_OVERRIDDEN_ACPI_TABLE > +bit 9 TAINT_WARN > +bit 10 TAINT_CRAP > +bit 11 TAINT_FIRMWARE_WORKAROUND > +bit 12 TAINT_OOT_MODULE > +bit 13 TAINT_UNSIGNED_MODULE > +bit 14 TAINT_SOFTLOCKUP > +bit 15 TAINT_LIVEPATCH > +bit 16 TAINT_AUX > +bit 17 TAINT_RANDSTRUCT > +bit 18 TAINT_FLAGS_COUNT > +== > + > +So, for example, to panic if the kernel gets tainted due to > +occurrences of bad pages and/or machine check errors, a user can:: > + > + echo 48 > /proc/sys/kernel/panic_on_taint > + > + > panic_print > === > > diff --git a/include/linux/kernel.h b/include/linux/kernel.h > index 9b7a8d74a9d6..518b9fd381c2 100644 > --- a/include/linux/kernel.h > +++ b/include/linux/kernel.h > @@ -528,6 +528,7 @@ extern int panic_on_oops; > extern int panic_on_unrecovered_nmi; > extern int panic_on_io_nmi; > extern int panic_on_warn; > +extern unsigned long panic_on_taint; > extern int sysctl_panic_on_rcu_stall; > extern int sysctl_panic_on_stackoverflow; > > diff --git a/kernel/panic.c b/kernel/panic.c > index b69ee9e76cb2..e2d4771ab911 100644 > --- a/kernel/panic.c > +++
[PATCH] kernel: add panic_on_taint
Analogously to the introduction of panic_on_warn, this patch introduces a kernel option named panic_on_taint in order to provide a simple and generic way to stop execution and catch a coredump when the kernel gets tainted by any given taint flag. This is useful for debugging sessions as it avoids rebuilding the kernel to explicitly add calls to panic() or BUG() into code sites that introduce the taint flags of interest. Another, perhaps less frequent, use for this option would be as a mean for assuring a security policy (in paranoid mode) case where no single taint is allowed for the running system. Suggested-by: Qian Cai Signed-off-by: Rafael Aquini --- Documentation/admin-guide/kdump/kdump.rst | 10 ++ .../admin-guide/kernel-parameters.txt | 3 ++ Documentation/admin-guide/sysctl/kernel.rst | 36 +++ include/linux/kernel.h| 1 + kernel/panic.c| 7 kernel/sysctl.c | 7 6 files changed, 64 insertions(+) diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst index ac7e131d2935..de3cf6d377cc 100644 --- a/Documentation/admin-guide/kdump/kdump.rst +++ b/Documentation/admin-guide/kdump/kdump.rst @@ -521,6 +521,16 @@ will cause a kdump to occur at the panic() call. In cases where a user wants to specify this during runtime, /proc/sys/kernel/panic_on_warn can be set to 1 to achieve the same behaviour. +Trigger Kdump on add_taint() + + +The kernel parameter, panic_on_taint, calls panic() from within add_taint(), +whenever the value set in this bitmask matches with the bit flag being set +by add_taint(). This will cause a kdump to occur at the panic() call. +In cases where a user wants to specify this during runtime, +/proc/sys/kernel/panic_on_taint can be set to a respective bitmask value +to achieve the same behaviour. + Contact === diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 7bc83f3d9bdf..75c02c1841b2 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3404,6 +3404,9 @@ panic_on_warn panic() instead of WARN(). Useful to cause kdump on a WARN(). + panic_on_taint panic() when the kernel gets tainted, if the taint + flag being set matches with the assigned bitmask. + crash_kexec_post_notifiers Run kdump after running panic-notifiers and dumping kmsg. This only for the users who doubt kdump always diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 0d427fd10941..5b880102f2e3 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -658,6 +658,42 @@ a kernel rebuild when attempting to kdump at the location of a WARN(). = +panic_on_taint +== + +Bitmask for calling panic() in the add_taint() path. +This is useful to avoid a kernel rebuild when attempting to +kdump at the insertion of any specific TAINT flags. +When set to 0 (default) add_taint() default behavior is maintained. + +== +bit 0 TAINT_PROPRIETARY_MODULE +bit 1 TAINT_FORCED_MODULE +bit 2 TAINT_CPU_OUT_OF_SPEC +bit 3 TAINT_FORCED_RMMOD +bit 4 TAINT_MACHINE_CHECK +bit 5 TAINT_BAD_PAGE +bit 6 TAINT_USER +bit 7 TAINT_DIE +bit 8 TAINT_OVERRIDDEN_ACPI_TABLE +bit 9 TAINT_WARN +bit 10 TAINT_CRAP +bit 11 TAINT_FIRMWARE_WORKAROUND +bit 12 TAINT_OOT_MODULE +bit 13 TAINT_UNSIGNED_MODULE +bit 14 TAINT_SOFTLOCKUP +bit 15 TAINT_LIVEPATCH +bit 16 TAINT_AUX +bit 17 TAINT_RANDSTRUCT +bit 18 TAINT_FLAGS_COUNT +== + +So, for example, to panic if the kernel gets tainted due to +occurrences of bad pages and/or machine check errors, a user can:: + + echo 48 > /proc/sys/kernel/panic_on_taint + + panic_print === diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 9b7a8d74a9d6..518b9fd381c2 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -528,6 +528,7 @@ extern int panic_on_oops; extern int panic_on_unrecovered_nmi; extern int panic_on_io_nmi; extern int panic_on_warn; +extern unsigned long panic_on_taint; extern int sysctl_panic_on_rcu_stall; extern int sysctl_panic_on_stackoverflow; diff --git a/kernel/panic.c b/kernel/panic.c index b69ee9e76cb2..e2d4771ab911 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -44,6 +44,7 @@ static int pause_on_oops_flag; static DEFINE_SPINLOCK(pause_on_oops_lock); bool crash_kexec_post_notifiers; int panic_on_warn __read_mostly; +unsigned long panic_on_taint __read_mostly; int panic_timeout = CONFIG_PANIC_TIMEOUT; EXPORT_SYMBOL_GPL(panic_timeout); @@ -434,6
