Greeting, FYI, we noticed the following commit (built with gcc-9): commit: d18d22ce8f62839365c984b1df474d3975ed4eb2 ("net: Fix packet reordering caused by GRO and listified RX cooperation") https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y in testcase: trinity version: trinity-i386-4d2343bd-1_20200320 with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +------------------------------------------------------------------+------------+------------+ | | 8bc3025206 | d18d22ce8f | +------------------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 4 | 6 | | UBSAN:Undefined_behaviour_in_arch/x86/kernel.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/tbprint.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/tbutils.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/tbdata.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/tbxface.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/workqueue.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/nsaccess.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_lib/string.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_arch/x86/kernel/alternative.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_arch/x86/realmode/init.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_crypto/algapi.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/events/core.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/exit.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/sched/cputime.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/locking/lockdep.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/tbxfload.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/dsmthdat.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/psargs.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/dsinit.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/evgpeinit.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/evregion.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/nsinit.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/utpredef.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/sysfs.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/rsutils.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/rsaddr.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/rscalc.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/rsmisc.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/acpi/acpica/rsxface.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_lib/zlib_inflate/inffast.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_crypto/api.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_drivers/base/devres.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/linux/compiler.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/uapi/linux/swab.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/linux/unaligned/access_ok.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/af_inet.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/net/ip.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/ipconfig.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/ip_input.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/udp.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/signal.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/linux/skbuff.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/cgroup/cgroup.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/ip6_offload.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/ip6_input.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/net/ipv6.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/route.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/icmp.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/net/ip6_checksum.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/ndisc.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/addrconf_core.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/addrconf.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv6/ip6_fib.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_fs/readdir.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/unix/garbage.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_include/linux/etherdevice.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/tcp_offload.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/tcp_ipv4.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/linux/tcp.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_include/net/dsfield.h | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/tcp_input.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/ipv4/tcp_minisocks.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_net/sunrpc/xprtsock.c | 4 | 6 | | UBSAN:Undefined_behaviour_in_kernel/events/hw_breakpoint.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_kernel/capability.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_kernel/time/time.c | 3 | | | UBSAN:Undefined_behaviour_in_kernel/sys.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_fs/utimes.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_kernel/futex.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_include/net/ndisc.h | 4 | 4 | | UBSAN:Undefined_behaviour_in_net/ipv6/udp.c | 4 | 4 | | UBSAN:Undefined_behaviour_in_include/linux/jhash.h | 4 | 4 | | UBSAN:Undefined_behaviour_in_include/net/neighbour.h | 4 | 4 | | EIP:check_poison_obj | 1 | 2 | | EIP:rcutorture_one_extend | 1 | | | UBSAN:Undefined_behaviour_in_kernel/sched/core.c | 2 | 4 | | EIP:arch_local_irq_enable | 1 | | | EIP:delay_tsc | 2 | 1 | | EIP:arch_local_irq_restore | 2 | 2 | | EIP:kmem_cache_alloc | 1 | | | UBSAN:Undefined_behaviour_in_fs/proc/array.c | 1 | | | EIP:__copy_user_ll | 1 | | | EIP:update_stack_state | 0 | 1 | | UBSAN:Undefined_behaviour_in_net/core/dev.c | 0 | 6 | | UBSAN:Undefined_behaviour_in_fs/ioctl.c | 0 | 2 | | EIP:copy_user_highpage | 0 | 1 | | EIP:do_fault | 0 | 1 | | EIP:native_safe_halt | 0 | 2 | +------------------------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; [ 439.724028] ================================================================================ [ 439.724993] UBSAN: Undefined behaviour in net/core/dev.c:5144:2 [ 439.725784] member access within misaligned address ba36ed7e for type 'struct sk_buff' [ 439.726595] which requires 8 byte alignment [ 439.727042] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.15-00023-gd18d22ce8f628 #1 [ 439.727807] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 439.728754] Call Trace: [ 439.729035] <SOFTIRQ> [ 439.729305] dump_stack+0x16/0x18 [ 439.729673] ubsan_epilogue+0x8/0x20 [ 439.730060] ubsan_type_mismatch_common+0x9f/0xed [ 439.730564] __ubsan_handle_type_mismatch_v1+0x2c/0x32 [ 439.731118] netif_receive_skb_list_internal+0xe9/0x3fe [ 439.731677] ? e1000_clean_rx_irq+0x758/0x94d [ 439.732145] gro_normal_list+0x43/0xbf [ 439.732597] napi_complete_done+0xbe/0x1c0 [ 439.733031] ? e1000_clean_jumbo_rx_irq+0xd72/0xd72 [ 439.733563] e1000_clean+0xf32/0x126e [ 439.733952] ? __lock_is_held+0x57/0x9e [ 439.734361] net_rx_action+0x15e/0x448 [ 439.734773] __do_softirq+0x277/0x573 [ 439.735164] ? __irqentry_text_end+0x7/0x7 [ 439.735599] do_softirq_own_stack+0x33/0x3a [ 439.736043] </SOFTIRQ> [ 439.736314] irq_exit+0x68/0xf4 [ 439.736683] do_IRQ+0xda/0xed [ 439.737009] common_interrupt+0x11b/0x120 [ 439.737435] EIP: native_safe_halt+0x12/0x13 [ 439.737932] Code: 10 ff 8b 03 a8 08 74 0a 81 25 40 1b df c2 ff ff ff 7f 58 5b 5e 5f 5d c3 a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 fb f4 <c3> a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 f4 c3 55 31 c0 [ 439.739875] EAX: 00000000 EBX: 00000000 ECX: 00989680 EDX: 00000006 [ 439.740568] ESI: c2dad280 EDI: c2dad280 EBP: c2d9df38 ESP: c2d9df34 [ 439.741226] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00200246 [ 439.741939] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.742381] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.742817] ? native_safe_halt+0x12/0x13 [ 439.743246] ? default_idle+0x2c/0x37 [ 439.743642] arch_cpu_idle+0x9/0xb [ 439.744007] default_idle_call+0x1d/0x1f [ 439.744430] do_idle+0x10d/0x296 [ 439.744807] ? schedule+0x14e/0x199 [ 439.745204] cpu_startup_entry+0xd/0xf [ 439.745631] rest_init+0xd2/0xd5 [ 439.745995] arch_call_rest_init+0x8/0xb [ 439.746431] start_kernel+0x3f4/0x3fc [ 439.746859] i386_start_kernel+0x42/0x44 [ 439.747277] startup_32_smp+0x164/0x168 [ 439.747689] ================================================================================ [ 439.750463] ================================================================================ [ 439.751352] UBSAN: Undefined behaviour in net/core/dev.c:5144:2 [ 439.752186] member access within misaligned address ba36ed7e for type 'struct sk_buff' [ 439.753066] which requires 8 byte alignment [ 439.753541] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.15-00023-gd18d22ce8f628 #1 [ 439.754353] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 439.755198] Call Trace: [ 439.755468] <SOFTIRQ> [ 439.755736] dump_stack+0x16/0x18 [ 439.756110] ubsan_epilogue+0x8/0x20 [ 439.756537] ubsan_type_mismatch_common+0x9f/0xed [ 439.757050] __ubsan_handle_type_mismatch_v1+0x2c/0x32 [ 439.757603] netif_receive_skb_list_internal+0x51/0x3fe [ 439.758227] ? e1000_clean_rx_irq+0x758/0x94d [ 439.758691] gro_normal_list+0x43/0xbf [ 439.759097] napi_complete_done+0xbe/0x1c0 [ 439.759530] ? e1000_clean_jumbo_rx_irq+0xd72/0xd72 [ 439.760045] e1000_clean+0xf32/0x126e [ 439.760444] ? __lock_is_held+0x57/0x9e [ 439.760871] net_rx_action+0x15e/0x448 [ 439.761259] __do_softirq+0x277/0x573 [ 439.761648] ? __irqentry_text_end+0x7/0x7 [ 439.762077] do_softirq_own_stack+0x33/0x3a [ 439.762516] </SOFTIRQ> [ 439.762787] irq_exit+0x68/0xf4 [ 439.763124] do_IRQ+0xda/0xed [ 439.763441] common_interrupt+0x11b/0x120 [ 439.763881] EIP: native_safe_halt+0x12/0x13 [ 439.764301] Code: 10 ff 8b 03 a8 08 74 0a 81 25 40 1b df c2 ff ff ff 7f 58 5b 5e 5f 5d c3 a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 fb f4 <c3> a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 f4 c3 55 31 c0 [ 439.766225] EAX: 00000000 EBX: 00000000 ECX: 00989680 EDX: 00000006 [ 439.766879] ESI: c2dad280 EDI: c2dad280 EBP: c2d9df38 ESP: c2d9df34 [ 439.767524] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00200246 [ 439.768297] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.768771] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.769212] ? native_safe_halt+0x12/0x13 [ 439.769649] ? default_idle+0x2c/0x37 [ 439.770043] arch_cpu_idle+0x9/0xb [ 439.770422] default_idle_call+0x1d/0x1f [ 439.770850] do_idle+0x10d/0x296 [ 439.771200] ? schedule+0x14e/0x199 [ 439.771571] cpu_startup_entry+0xd/0xf [ 439.771970] rest_init+0xd2/0xd5 [ 439.772321] arch_call_rest_init+0x8/0xb [ 439.772763] start_kernel+0x3f4/0x3fc [ 439.773148] i386_start_kernel+0x42/0x44 [ 439.773568] startup_32_smp+0x164/0x168 [ 439.773984] ================================================================================ [ 439.774851] ================================================================================ [ 439.775731] UBSAN: Undefined behaviour in net/core/dev.c:5054:2 [ 439.776563] member access within misaligned address ba36ed7e for type 'struct sk_buff' [ 439.777424] which requires 8 byte alignment [ 439.777924] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.15-00023-gd18d22ce8f628 #1 [ 439.778704] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 439.779548] Call Trace: [ 439.779833] <SOFTIRQ> [ 439.780098] dump_stack+0x16/0x18 [ 439.780492] ubsan_epilogue+0x8/0x20 [ 439.780897] ubsan_type_mismatch_common+0x9f/0xed [ 439.781389] __ubsan_handle_type_mismatch_v1+0x2c/0x32 [ 439.781932] netif_receive_skb_list_internal+0x39d/0x3fe [ 439.782487] gro_normal_list+0x43/0xbf [ 439.782897] napi_complete_done+0xbe/0x1c0 [ 439.783336] ? e1000_clean_jumbo_rx_irq+0xd72/0xd72 [ 439.783853] e1000_clean+0xf32/0x126e [ 439.784249] ? __lock_is_held+0x57/0x9e [ 439.784705] net_rx_action+0x15e/0x448 [ 439.785089] __do_softirq+0x277/0x573 [ 439.785468] ? __irqentry_text_end+0x7/0x7 [ 439.785886] do_softirq_own_stack+0x33/0x3a [ 439.786330] </SOFTIRQ> [ 439.786606] irq_exit+0x68/0xf4 [ 439.786948] do_IRQ+0xda/0xed [ 439.787268] common_interrupt+0x11b/0x120 [ 439.787698] EIP: native_safe_halt+0x12/0x13 [ 439.788194] Code: 10 ff 8b 03 a8 08 74 0a 81 25 40 1b df c2 ff ff ff 7f 58 5b 5e 5f 5d c3 a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 fb f4 <c3> a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 f4 c3 55 31 c0 [ 439.790264] EAX: 00000000 EBX: 00000000 ECX: 00989680 EDX: 00000006 [ 439.790910] ESI: c2dad280 EDI: c2dad280 EBP: c2d9df38 ESP: c2d9df34 [ 439.791554] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00200246 [ 439.792262] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.792718] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.793159] ? native_safe_halt+0x12/0x13 [ 439.793585] ? default_idle+0x2c/0x37 [ 439.793979] arch_cpu_idle+0x9/0xb [ 439.794345] default_idle_call+0x1d/0x1f [ 439.794763] do_idle+0x10d/0x296 [ 439.795112] ? schedule+0x14e/0x199 [ 439.795488] cpu_startup_entry+0xd/0xf [ 439.795884] rest_init+0xd2/0xd5 [ 439.796236] arch_call_rest_init+0x8/0xb [ 439.796682] start_kernel+0x3f4/0x3fc [ 439.797074] i386_start_kernel+0x42/0x44 [ 439.797487] startup_32_smp+0x164/0x168 [ 439.797957] ================================================================================ [ 439.798825] ================================================================================ [ 439.799688] UBSAN: Undefined behaviour in net/core/dev.c:5054:2 [ 439.800526] member access within misaligned address ba36ed7e for type 'struct sk_buff' [ 439.801371] which requires 8 byte alignment [ 439.801839] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.15-00023-gd18d22ce8f628 #1 [ 439.802643] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 439.803535] Call Trace: [ 439.803802] <SOFTIRQ> [ 439.804066] dump_stack+0x16/0x18 [ 439.804422] ubsan_epilogue+0x8/0x20 [ 439.804829] ubsan_type_mismatch_common+0x9f/0xed [ 439.805317] __ubsan_handle_type_mismatch_v1+0x2c/0x32 [ 439.805851] netif_receive_skb_list_internal+0x208/0x3fe [ 439.806405] gro_normal_list+0x43/0xbf [ 439.806804] napi_complete_done+0xbe/0x1c0 [ 439.807253] ? e1000_clean_jumbo_rx_irq+0xd72/0xd72 [ 439.807782] e1000_clean+0xf32/0x126e [ 439.808244] ? __lock_is_held+0x57/0x9e [ 439.808702] net_rx_action+0x15e/0x448 [ 439.809125] __do_softirq+0x277/0x573 [ 439.809513] ? __irqentry_text_end+0x7/0x7 [ 439.809944] do_softirq_own_stack+0x33/0x3a [ 439.810387] </SOFTIRQ> [ 439.810656] irq_exit+0x68/0xf4 [ 439.810998] do_IRQ+0xda/0xed [ 439.811322] common_interrupt+0x11b/0x120 [ 439.811747] EIP: native_safe_halt+0x12/0x13 [ 439.812189] Code: 10 ff 8b 03 a8 08 74 0a 81 25 40 1b df c2 ff ff ff 7f 58 5b 5e 5f 5d c3 a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 fb f4 <c3> a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 f4 c3 55 31 c0 [ 439.814134] EAX: 00000000 EBX: 00000000 ECX: 00989680 EDX: 00000006 [ 439.814799] ESI: c2dad280 EDI: c2dad280 EBP: c2d9df38 ESP: c2d9df34 [ 439.815463] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00200246 [ 439.816222] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.816679] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.817226] ? native_safe_halt+0x12/0x13 [ 439.817677] ? default_idle+0x2c/0x37 [ 439.818149] arch_cpu_idle+0x9/0xb [ 439.818521] default_idle_call+0x1d/0x1f [ 439.818938] do_idle+0x10d/0x296 [ 439.819282] ? schedule+0x14e/0x199 [ 439.819648] cpu_startup_entry+0xd/0xf [ 439.820050] rest_init+0xd2/0xd5 [ 439.820409] arch_call_rest_init+0x8/0xb [ 439.820853] start_kernel+0x3f4/0x3fc [ 439.821250] i386_start_kernel+0x42/0x44 [ 439.821663] startup_32_smp+0x164/0x168 [ 439.822067] ================================================================================ [ 439.822933] ================================================================================ [ 439.823800] UBSAN: Undefined behaviour in net/core/dev.c:5000:2 [ 439.824624] member access within misaligned address ba36ed7e for type 'struct sk_buff' [ 439.825443] which requires 8 byte alignment [ 439.825891] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.15-00023-gd18d22ce8f628 #1 [ 439.826650] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 439.827527] Call Trace: [ 439.827800] <SOFTIRQ> [ 439.828116] dump_stack+0x16/0x18 [ 439.828520] ubsan_epilogue+0x8/0x20 [ 439.828904] ubsan_type_mismatch_common+0x9f/0xed [ 439.829397] __ubsan_handle_type_mismatch_v1+0x2c/0x32 [ 439.829943] __netif_receive_skb_list_core+0x135/0x154 [ 439.830492] netif_receive_skb_list_internal+0x3e3/0x3fe [ 439.831044] gro_normal_list+0x43/0xbf [ 439.831440] napi_complete_done+0xbe/0x1c0 [ 439.831901] ? e1000_clean_jumbo_rx_irq+0xd72/0xd72 [ 439.832427] e1000_clean+0xf32/0x126e [ 439.832892] ? __lock_is_held+0x57/0x9e [ 439.833324] net_rx_action+0x15e/0x448 [ 439.833726] __do_softirq+0x277/0x573 [ 439.834118] ? __irqentry_text_end+0x7/0x7 [ 439.834553] do_softirq_own_stack+0x33/0x3a [ 439.834996] </SOFTIRQ> [ 439.835282] irq_exit+0x68/0xf4 [ 439.835622] do_IRQ+0xda/0xed [ 439.835964] common_interrupt+0x11b/0x120 [ 439.836395] EIP: native_safe_halt+0x12/0x13 [ 439.837047] Code: 10 ff 8b 03 a8 08 74 0a 81 25 40 1b df c2 ff ff ff 7f 58 5b 5e 5f 5d c3 a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 fb f4 <c3> a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 f4 c3 55 31 c0 [ 439.839039] EAX: 00000000 EBX: 00000000 ECX: 00989680 EDX: 00000006 [ 439.839708] ESI: c2dad280 EDI: c2dad280 EBP: c2d9df38 ESP: c2d9df34 [ 439.840369] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00200246 [ 439.841078] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.841489] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.841894] ? native_safe_halt+0x12/0x13 [ 439.842306] ? default_idle+0x2c/0x37 [ 439.842678] arch_cpu_idle+0x9/0xb [ 439.843028] default_idle_call+0x1d/0x1f [ 439.843458] do_idle+0x10d/0x296 [ 439.843812] ? schedule+0x14e/0x199 [ 439.844176] cpu_startup_entry+0xd/0xf [ 439.844605] rest_init+0xd2/0xd5 [ 439.844965] arch_call_rest_init+0x8/0xb [ 439.845387] start_kernel+0x3f4/0x3fc [ 439.845789] i386_start_kernel+0x42/0x44 [ 439.846203] startup_32_smp+0x164/0x168 [ 439.846610] ================================================================================ [ 439.847484] ================================================================================ [ 439.848401] UBSAN: Undefined behaviour in net/core/dev.c:5000:2 [ 439.849226] member access within misaligned address ba36ed7e for type 'struct sk_buff' [ 439.850048] which requires 8 byte alignment [ 439.850488] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.15-00023-gd18d22ce8f628 #1 [ 439.851283] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 439.852106] Call Trace: [ 439.852364] <SOFTIRQ> [ 439.852688] dump_stack+0x16/0x18 [ 439.853045] ubsan_epilogue+0x8/0x20 [ 439.853427] ubsan_type_mismatch_common+0x9f/0xed [ 439.853937] __ubsan_handle_type_mismatch_v1+0x2c/0x32 [ 439.854479] __netif_receive_skb_list_core+0x69/0x154 [ 439.855021] netif_receive_skb_list_internal+0x3e3/0x3fe [ 439.855574] gro_normal_list+0x43/0xbf [ 439.855976] napi_complete_done+0xbe/0x1c0 [ 439.856413] ? e1000_clean_jumbo_rx_irq+0xd72/0xd72 [ 439.856956] e1000_clean+0xf32/0x126e [ 439.857345] ? __lock_is_held+0x57/0x9e [ 439.857752] net_rx_action+0x15e/0x448 [ 439.858215] __do_softirq+0x277/0x573 [ 439.858615] ? __irqentry_text_end+0x7/0x7 [ 439.859046] do_softirq_own_stack+0x33/0x3a [ 439.859485] </SOFTIRQ> [ 439.859755] irq_exit+0x68/0xf4 [ 439.860095] do_IRQ+0xda/0xed [ 439.860415] common_interrupt+0x11b/0x120 [ 439.860882] EIP: native_safe_halt+0x12/0x13 [ 439.861340] Code: 10 ff 8b 03 a8 08 74 0a 81 25 40 1b df c2 ff ff ff 7f 58 5b 5e 5f 5d c3 a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 fb f4 <c3> a1 58 44 d6 c3 85 c0 7e 07 0f 00 2d 5c f9 5f c2 f4 c3 55 31 c0 [ 439.863238] EAX: 00000000 EBX: 00000000 ECX: 00989680 EDX: 00000006 [ 439.863888] ESI: c2dad280 EDI: c2dad280 EBP: c2d9df38 ESP: c2d9df34 [ 439.864589] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00200246 [ 439.865335] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.865760] ? rwsem_mark_wake+0x2a9/0x4c2 [ 439.866134] ? native_safe_halt+0x12/0x13 [ 439.866540] ? default_idle+0x2c/0x37 [ 439.866910] arch_cpu_idle+0x9/0xb [ 439.867259] default_idle_call+0x1d/0x1f [ 439.867660] do_idle+0x10d/0x296 [ 439.868064] ? schedule+0x14e/0x199 [ 439.868447] cpu_startup_entry+0xd/0xf [ 439.868878] rest_init+0xd2/0xd5 [ 439.869230] arch_call_rest_init+0x8/0xb [ 439.869645] start_kernel+0x3f4/0x3fc [ 439.870020] i386_start_kernel+0x42/0x44 [ 439.870409] startup_32_smp+0x164/0x168 [ 439.870802] ================================================================================ [ 442.758767] sysrq: Emergency Sync [ 442.759580] sysrq: Resetting Kboot worker: lkp-worker48 Elapsed time: 480 kvm=( qemu-system-i386 -enable-kvm -cpu SandyBridge -kernel $kernel -initrd initrd-vm-snb-i386-8.cgz -m 8192 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::32032-:22 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -serial stdio -display none -monitor null ) append=( ip=::::vm-snb-i386-8::dhcp root=/dev/ram0 user=lkp job=/job-script ARCH=i386 kconfig=i386-randconfig-a015-20200923 branch=linux-stable-rc/linux-5.4.y commit=d18d22ce8f62839365c984b1df474d3975ed4eb2 BOOT_IMAGE=/pkg/linux/i386-randconfig-a015-20200923/gcc-9/d18d22ce8f62839365c984b1df474d3975ed4eb2/vmlinuz-5.4.15-00023-gd18d22ce8f628 max_uptime=3600 RESULT_ROOT=/result/trinity/300s/vm-snb-i386/debian-i386-20191205.cgz/i386-randconfig-a015-20200923/gcc-9/d18d22ce8f62839365c984b1df474d3975ed4eb2/3 result_service=tmpfs selinux=0 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel To reproduce: # build kernel cd linux cp config-5.4.15-00023-gd18d22ce8f628 .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email

Thanks, Rong Chen