Date: Thu, 15 May 2025 10:42:36 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 286819] Boot panics when KMSAN enabled with Ethernet driver Message-ID: <bug-286819-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286819 Bug ID: 286819 Summary: Boot panics when KMSAN enabled with Ethernet driver Product: Base System Version: 14.2-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: hareshx.sankar.raj@intel.com Boot panics when KMSAN is enabled in the kernel config. Kernel config used is: KERNCONF=GENERIC-KMSAN We had tested this in FBSD 14 stable branch and also on FBSD 14.2 release branch. The issue remains the same. Steps to reproduce: git clone https://github.com/freebsd/freebsd-src /usr/src/ git checkout stable/14 echo "Build kernel" cd /usr/src && make buildworld buildkernel -j`sysctl hw.ncpu | sed s'/hw.ncpu: //'` KERNCONF=GENERIC-KMSAN echo "Install kernel" make installworld installkernel -j`sysctl hw.ncpu | sed s'/hw.ncpu: //'` KERNCONF=GENERIC-KMSAN echo "Reboot" reboot Kernel build and installation is successful. Boot failed with below panic. panic: MSan: uninitialized variable in 0xffffffff81234e16 cpuid = 48 time = 1746712489 KDB: stack backtrace: #0 0xffffffff834a2616 at kdb_backtrace+0x166 #1 0xffffffff832ca9bf at vpanic+0x66f #2 0xffffffff832ca34d at panic+0x1dd #3 0xffffffff834b1ed9 at __msan_warning+0x219 #4 0xffffffff81234e16 at em_newitr+0xa66 #5 0xffffffff81275a02 at em_msix_que+0x172 #6 0xffffffff83a48b47 at iflib_fast_intr_rxtx+0xe7 #7 0xffffffff8314bfc4 at intr_event_handle+0x3e4 #8 0xffffffff84f4037b at intr_execute_handlers+0x1bb #9 0xffffffff854a0fe0 at lapic_handle_intr+0x190 #10 0xffffffff84f81d11 at Xapic_isr1+0xe1 #11 0xffffffff84f315f5 at cpu_idle_acpi+0xf5 #12 0xffffffff84f31907 at cpu_idle+0x2d7 #13 0xffffffff8340521a at sched_idletd+0x62a #14 0xffffffff83139496 at fork_exit+0x266 #15 0xffffffff84f81a2e at fork_trampoline+0xe Based on initial analysis, the error is found as below. (kgdb) list *0xffffffff81234e16 0xffffffff81234e16 is in em_newitr (/usr/src/sys/dev/e1000/if_em.c:1700). warning: Source file is more recent than executable. 1695 nextlatency = itr_latency_bulk; 1696 else if ((packets < 5) && (bytes > 512)) 1697 nextlatency = itr_latency_low; 1698 break; 1699 case itr_latency_low: /* 20k ints/s */ 1700 if (bytes > 10000) { 1701 /* Handle TSO */ 1702 if (bytes_packets > 8000) 1703 nextlatency = itr_latency_bulk; 1704 else if ((packets < 10) || The stack frame associated with the panic is happening in /usr/src/sys/dev/e1000/if_em.c Ethernet driver. -- You are receiving this mail because: You are the assignee for the bug.home | help
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