https://bugzilla.kernel.org/show_bug.cgi?id=121091 Bug ID: 121091 Summary: guest os kernel report "virtio_net virtio0: input.0:id 0 is not a head!" and then kernel block Product: Virtualization Version: unspecified Kernel Version: 3.18 Hardware: Intel OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx Reporter: yuewenyuan31837@xxxxxxx Regression: No environment: host kernel version: 3.14.23 QEMU emulator version: 2.1.3 guest os kernel version: 3.18.20 reproduce problem: 1.start vm with 2vcpus 2.attach interface 3.detach interface cpu stack: crash> bt PID: 0 TASK: ffffffff81818450 CPU: 0 COMMAND: "swapper/0" [exception RIP: virtnet_poll+60] RIP: ffffffff81330386 RSP: ffff88007fc03e88 RFLAGS: 00000246 RAX: dead000000100100 RBX: ffff88007a6af808 RCX: 0000000000000100 RDX: dead000000200200 RSI: 0000000000000000 RDI: 0000000000000246 RBP: 0000000000000000 R8: 0000000000000000 R9: 00000000ffffffff R10: 00000000ffffffff R11: ffff88007a6af808 R12: 0000000000000040 R13: ffff88007a6af800 R14: 0000000000000103 R15: ffff88007fc13990 CS: 0010 SS: 0018 #0 [ffff88007fc03eb0] net_rx_action at ffffffff81373640 #1 [ffff88007fc03f10] __do_softirq at ffffffff8104de17 #2 [ffff88007fc03f70] irq_exit at ffffffff8104e0de #3 [ffff88007fc03f80] do_IRQ at ffffffff8100ee6b --- <IRQ stack> --- #4 [ffffffff81803e48] ret_from_intr at ffffffff8143466d [exception RIP: native_safe_halt+2] RIP: ffffffff8103b923 RSP: ffffffff81803ef0 RFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88007fc0da00 RCX: 00000000ffffffff RDX: ffffffff81842f00 RSI: 0000000000000000 RDI: ffffffff81800000 RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000000 R10: 000000000000b464 R11: 000000000000b464 R12: 0000000000000000 R13: 0000000101432bf8 R14: 00004d52b5fe5100 R15: 0000000000000017 ORIG_RAX: ffffffffffffff1e CS: 0010 SS: 0018 #5 [ffffffff81803ef0] default_idle at ffffffff810153a9 #6 [ffffffff81803f00] cpu_startup_entry at ffffffff81075463 #7 [ffffffff81803f60] start_kernel at ffffffff818d1efb #8 [ffffffff81803f78] early_idt_handler_array at ffffffff818d1117 #9 [ffffffff81803f98] early_idt_handler_array at ffffffff818d1117 #10 [ffffffff81803fb0] x86_64_start_kernel at ffffffff818d15fe I revert the commit 78fd1d0ab072d4d9b5f0b7c14a1516665170b565 and this problem will not happen again. Guest os with kernel 3.19 and 4.0 was tested, and this problem is still there. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
