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X-Received: by 2002:a92:730d:: with SMTP id o13mr6578598ilc.174.1579711631042; Wed, 22 Jan 2020 08:47:11 -0800 (PST) Date: Wed, 22 Jan 2020 08:47:11 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009db040059cbd46a4@google.com> Subject: KMSAN: uninit-value in eth_type_trans (2) From: syzbot To: daniel@iogearbox.net, davem@davemloft.net, edumazet@google.com, glider@google.com, hkallweit1@gmail.com, linux-kernel@vger.kernel.org, maximmi@mellanox.com, netdev@vger.kernel.org, sdf@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 686a4f77 kmsan: don't compile memmove git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=104b74c9e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e10654781bc1f11c dashboard link: https://syzkaller.appspot.com/bug?extid=0901d0cc75c3d716a3a3 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c91cc9e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=136a6faee00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0901d0cc75c3d716a3a3@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in eth_type_trans+0x356/0xa90 net/ethernet/eth.c:167 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 eth_type_trans+0x356/0xa90 net/ethernet/eth.c:167 __dev_forward_skb+0x3ec/0x990 net/core/dev.c:2074 veth_forward_skb drivers/net/veth.c:231 [inline] veth_xmit+0x3fe/0xb70 drivers/net/veth.c:262 __netdev_start_xmit include/linux/netdevice.h:4447 [inline] netdev_start_xmit include/linux/netdevice.h:4461 [inline] xmit_one net/core/dev.c:3420 [inline] dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3436 __dev_queue_xmit+0x37de/0x4220 net/core/dev.c:4013 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4046 hsr_xmit net/hsr/hsr_forward.c:228 [inline] hsr_forward_do net/hsr/hsr_forward.c:285 [inline] hsr_forward_skb+0x2614/0x30d0 net/hsr/hsr_forward.c:361 hsr_handle_frame+0x385/0x4b0 net/hsr/hsr_slave.c:43 __netif_receive_skb_core+0x21de/0x5840 net/core/dev.c:5051 __netif_receive_skb_one_core net/core/dev.c:5148 [inline] __netif_receive_skb net/core/dev.c:5264 [inline] process_backlog+0x936/0x1410 net/core/dev.c:6095 napi_poll net/core/dev.c:6532 [inline] net_rx_action+0x786/0x1ab0 net/core/dev.c:6600 __do_softirq+0x311/0x83d kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:834 RIP: 0010:default_idle+0x53/0x90 arch/x86/kernel/process.c:700 Code: 13 f9 d6 f2 44 8b 35 64 54 d8 01 48 c7 c7 38 b7 22 be e8 50 1d a2 f3 83 38 00 75 31 45 85 f6 7e 07 0f 00 2d 27 fe 56 00 fb f4 <65> 8b 35 46 c0 b6 43 c7 03 00 00 00 00 c7 43 08 00 00 00 00 bf ff RSP: 0018:ffffffffbd603d88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff912c3d81e738 RBX: ffffffffbd62cb90 RCX: fffffa5d46130d70 RDX: ffff912c35c11738 RSI: 0000000000000000 RDI: ffffffffbe22b738 RBP: ffffffffbd603d98 R08: fffffa5d4000000f R09: ffff912b67bfb000 R10: 0000000000000004 R11: ffffffffbc4a62a0 R12: ffffffffbd62c1c0 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffffbd62cb90 arch_cpu_idle+0x25/0x30 arch/x86/kernel/process.c:690 default_idle_call kernel/sched/idle.c:94 [inline] cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x26c/0x7b0 kernel/sched/idle.c:269 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:361 rest_init+0x1be/0x1f0 init/main.c:452 arch_call_rest_init+0x13/0x15 start_kernel+0x975/0xb3e init/main.c:787 x86_64_start_reservations+0x18/0x28 arch/x86/kernel/head64.c:490 x86_64_start_kernel+0x83/0x86 arch/x86/kernel/head64.c:471 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x38b/0x1b00 net/core/skbuff.c:1637 __skb_pad+0x47f/0x900 net/core/skbuff.c:1805 __skb_put_padto include/linux/skbuff.h:3193 [inline] skb_put_padto include/linux/skbuff.h:3212 [inline] send_hsr_supervision_frame+0x122d/0x1500 net/hsr/hsr_device.c:310 hsr_announce+0x1e2/0x370 net/hsr/hsr_device.c:341 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xcff/0x1210 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:307 [inline] kmsan_alloc_page+0x12a/0x310 mm/kmsan/kmsan_shadow.c:336 __alloc_pages_nodemask+0x57f2/0x5f60 mm/page_alloc.c:4800 __alloc_pages include/linux/gfp.h:498 [inline] __alloc_pages_node include/linux/gfp.h:511 [inline] alloc_pages_node include/linux/gfp.h:525 [inline] __page_frag_cache_refill mm/page_alloc.c:4875 [inline] page_frag_alloc+0x3ae/0x910 mm/page_alloc.c:4905 __napi_alloc_skb+0x193/0xa60 net/core/skbuff.c:519 napi_alloc_skb include/linux/skbuff.h:2825 [inline] page_to_skb+0x19f/0x1100 drivers/net/virtio_net.c:384 receive_mergeable drivers/net/virtio_net.c:924 [inline] receive_buf+0xe57/0x8ac0 drivers/net/virtio_net.c:1033 virtnet_receive drivers/net/virtio_net.c:1323 [inline] virtnet_poll+0x64b/0x19f0 drivers/net/virtio_net.c:1428 napi_poll net/core/dev.c:6532 [inline] net_rx_action+0x786/0x1ab0 net/core/dev.c:6600 __do_softirq+0x311/0x83d kernel/softirq.c:293 ===================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches