diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0009-x86-mce-Fix-incorrect-Machine-check-from-unknown-sou.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0009-x86-mce-Fix-incorrect-Machine-check-from-unknown-sou.patch | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0009-x86-mce-Fix-incorrect-Machine-check-from-unknown-sou.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0009-x86-mce-Fix-incorrect-Machine-check-from-unknown-sou.patch deleted file mode 100644 index 76fa3b70..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0009-x86-mce-Fix-incorrect-Machine-check-from-unknown-sou.patch +++ /dev/null @@ -1,103 +0,0 @@ -From 1357825b6905bcf665161dc41b764a83b21954e9 Mon Sep 17 00:00:00 2001 -From: Tony Luck <tony.luck@intel.com> -Date: Fri, 22 Jun 2018 11:54:23 +0200 -Subject: [PATCH 09/10] x86/mce: Fix incorrect "Machine check from unknown - source" message - -commit 40c36e2741d7fe1e66d6ec55477ba5fd19c9c5d2 upstream. - -Some injection testing resulted in the following console log: - - mce: [Hardware Error]: CPU 22: Machine Check Exception: f Bank 1: bd80000000100134 - mce: [Hardware Error]: RIP 10:<ffffffffc05292dd> {pmem_do_bvec+0x11d/0x330 [nd_pmem]} - mce: [Hardware Error]: TSC c51a63035d52 ADDR 3234bc4000 MISC 88 - mce: [Hardware Error]: PROCESSOR 0:50654 TIME 1526502199 SOCKET 0 APIC 38 microcode 2000043 - mce: [Hardware Error]: Run the above through 'mcelog --ascii' - Kernel panic - not syncing: Machine check from unknown source - -This confused everybody because the first line quite clearly shows -that we found a logged error in "Bank 1", while the last line says -"unknown source". - -The problem is that the Linux code doesn't do the right thing -for a local machine check that results in a fatal error. - -It turns out that we know very early in the handler whether the -machine check is fatal. The call to mce_no_way_out() has checked -all the banks for the CPU that took the local machine check. If -it says we must crash, we can do so right away with the right -messages. - -We do scan all the banks again. This means that we might initially -not see a problem, but during the second scan find something fatal. -If this happens we print a slightly different message (so I can -see if it actually every happens). - -[ bp: Remove unneeded severity assignment. ] - -Signed-off-by: Tony Luck <tony.luck@intel.com> -Signed-off-by: Borislav Petkov <bp@suse.de> -Signed-off-by: Thomas Gleixner <tglx@linutronix.de> -Cc: Ashok Raj <ashok.raj@intel.com> -Cc: Dan Williams <dan.j.williams@intel.com> -Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com> -Cc: linux-edac <linux-edac@vger.kernel.org> -Cc: stable@vger.kernel.org # 4.2 -Link: http://lkml.kernel.org/r/52e049a497e86fd0b71c529651def8871c804df0.1527283897.git.tony.luck@intel.com -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/kernel/cpu/mcheck/mce.c | 26 ++++++++++++++++++-------- - 1 file changed, 18 insertions(+), 8 deletions(-) - -diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c -index 72bcd08..4711e1c 100644 ---- a/arch/x86/kernel/cpu/mcheck/mce.c -+++ b/arch/x86/kernel/cpu/mcheck/mce.c -@@ -1169,13 +1169,18 @@ void do_machine_check(struct pt_regs *regs, long error_code) - lmce = m.mcgstatus & MCG_STATUS_LMCES; - - /* -+ * Local machine check may already know that we have to panic. -+ * Broadcast machine check begins rendezvous in mce_start() - * Go through all banks in exclusion of the other CPUs. This way we - * don't report duplicated events on shared banks because the first one -- * to see it will clear it. If this is a Local MCE, then no need to -- * perform rendezvous. -+ * to see it will clear it. - */ -- if (!lmce) -+ if (lmce) { -+ if (no_way_out) -+ mce_panic("Fatal local machine check", &m, msg); -+ } else { - order = mce_start(&no_way_out); -+ } - - for (i = 0; i < cfg->banks; i++) { - __clear_bit(i, toclear); -@@ -1251,12 +1256,17 @@ void do_machine_check(struct pt_regs *regs, long error_code) - no_way_out = worst >= MCE_PANIC_SEVERITY; - } else { - /* -- * Local MCE skipped calling mce_reign() -- * If we found a fatal error, we need to panic here. -+ * If there was a fatal machine check we should have -+ * already called mce_panic earlier in this function. -+ * Since we re-read the banks, we might have found -+ * something new. Check again to see if we found a -+ * fatal error. We call "mce_severity()" again to -+ * make sure we have the right "msg". - */ -- if (worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3) -- mce_panic("Machine check from unknown source", -- NULL, NULL); -+ if (worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3) { -+ mce_severity(&m, cfg->tolerant, &msg, true); -+ mce_panic("Local fatal machine check!", &m, msg); -+ } - } - - /* --- -2.7.4 - |