2018-03-28 15:13 GMT+08:00 syzbot <syzbot+760a73552f47a8cd0fd9@xxxxxxxxxxxxxxxxxxxxxxxxx>: > Hello, > > syzbot hit the following crash on upstream commit > 99fec39e7725d091c94d1bb0242e40c8092994f6 (Fri Mar 23 22:34:18 2018 +0000) > Merge tag 'trace-v4.16-rc4' of > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9 > > Unfortunately, I don't have any reproducer for this crash yet. > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=6275011434250240 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-5034017172441945317 > compiler: gcc (GCC) 7.1.1 20170620 > user-space arch: i386 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+760a73552f47a8cd0fd9@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > WARNING: CPU: 1 PID: 9515 at arch/x86/kvm/x86.c:7544 Maybe the same as this one. https://lkml.org/lkml/2018/3/21/174 Paolo, any idea against my analysis? Regards, Wanpeng Li > kvm_arch_vcpu_ioctl_run+0x1c7/0x5c80 arch/x86/kvm/x86.c:7544 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 1 PID: 9515 Comm: syz-executor4 Not tainted 4.16.0-rc6+ #274 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x24d lib/dump_stack.c:53 > panic+0x1e4/0x41c kernel/panic.c:183 > __warn+0x1dc/0x200 kernel/panic.c:547 > report_bug+0x1f4/0x2b0 lib/bug.c:186 > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 > fixup_bug arch/x86/kernel/traps.c:247 [inline] > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 > invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986 > RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1c7/0x5c80 arch/x86/kvm/x86.c:7544 > RSP: 0018:ffff8801a2d17580 EFLAGS: 00010212 > RAX: 0000000000010000 RBX: ffff8801cdfd8000 RCX: ffffffff810dfea7 > RDX: 0000000000000062 RSI: ffffc90003c1b000 RDI: ffff8801ac1a8498 > RBP: ffff8801a2d17910 R08: 1ffff10035835b2d R09: 0000000000000001 > R10: ffff8801a2d17560 R11: 0000000000000005 R12: 0000000000000000 > R13: ffff8801ab083100 R14: ffff8801ac1a8280 R15: ffff8801ac1a8280 > kvm_vcpu_ioctl+0x6f1/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2560 > kvm_vcpu_compat_ioctl+0x364/0x450 > arch/x86/kvm/../../../virt/kvm/kvm_main.c:2755 > C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline] > compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1407 > do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] > do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 > entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 > RIP: 0023:0xf7f41c99 > RSP: 002b:00000000f773d09c EFLAGS: 00000286 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 000000000000ae80 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body.
