This is a note to let you know that I've just added the patch titled
Drivers: hv: avoid vfree() on crash
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-hv-avoid-vfree-on-crash.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a9f61ca793becabdefab03b77568d6c6f8c1bc79 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Date: Fri, 3 Jun 2016 17:09:22 -0700
Subject: Drivers: hv: avoid vfree() on crash
From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
commit a9f61ca793becabdefab03b77568d6c6f8c1bc79 upstream.
When we crash from NMI context (e.g. after NMI injection from host when
'sysctl -w kernel.unknown_nmi_panic=1' is set) we hit
kernel BUG at mm/vmalloc.c:1530!
as vfree() is denied. While the issue could be solved with in_nmi() check
instead I opted for skipping vfree on all sorts of crashes to reduce the
amount of work which can cause consequent crashes. We don't really need to
free anything on crash.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv.c | 8 +++++---
drivers/hv/hyperv_vmbus.h | 2 +-
drivers/hv/vmbus_drv.c | 8 ++++----
3 files changed, 10 insertions(+), 8 deletions(-)
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -274,7 +274,7 @@ cleanup:
*
* This routine is called normally during driver unloading or exiting.
*/
-void hv_cleanup(void)
+void hv_cleanup(bool crash)
{
union hv_x64_msr_hypercall_contents hypercall_msr;
@@ -284,7 +284,8 @@ void hv_cleanup(void)
if (hv_context.hypercall_page) {
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
- vfree(hv_context.hypercall_page);
+ if (!crash)
+ vfree(hv_context.hypercall_page);
hv_context.hypercall_page = NULL;
}
@@ -304,7 +305,8 @@ void hv_cleanup(void)
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
- vfree(hv_context.tsc_page);
+ if (!crash)
+ vfree(hv_context.tsc_page);
hv_context.tsc_page = NULL;
}
#endif
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -581,7 +581,7 @@ struct hv_ring_buffer_debug_info {
extern int hv_init(void);
-extern void hv_cleanup(void);
+extern void hv_cleanup(bool crash);
extern int hv_post_message(union hv_connection_id connection_id,
enum hv_message_type message_type,
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -889,7 +889,7 @@ err_alloc:
bus_unregister(&hv_bus);
err_cleanup:
- hv_cleanup();
+ hv_cleanup(false);
return ret;
}
@@ -1254,7 +1254,7 @@ static void hv_kexec_handler(void)
vmbus_initiate_unload();
for_each_online_cpu(cpu)
smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
- hv_cleanup();
+ hv_cleanup(false);
};
static void hv_crash_handler(struct pt_regs *regs)
@@ -1266,7 +1266,7 @@ static void hv_crash_handler(struct pt_r
* for kdump.
*/
hv_synic_cleanup(NULL);
- hv_cleanup();
+ hv_cleanup(true);
};
static int __init hv_acpi_init(void)
@@ -1330,7 +1330,7 @@ static void __exit vmbus_exit(void)
&hyperv_panic_block);
}
bus_unregister(&hv_bus);
- hv_cleanup();
+ hv_cleanup(false);
for_each_online_cpu(cpu) {
tasklet_kill(hv_context.event_dpc[cpu]);
smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
Patches currently in stable-queue which might be from vkuznets@xxxxxxxxxx are
queue-4.4/drivers-hv-balloon-don-t-crash-when-memory-is-added-in-non-sorted-order.patch
queue-4.4/drivers-hv-avoid-vfree-on-crash.patch
queue-4.4/hv_netvsc-use-skb_get_hash-instead-of-a-homegrown-implementation.patch