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Message-ID: <001a1141c43a81e725056133453e@google.com> Date: Mon, 25 Dec 2017 16:22:00 -0800 From: syzbot <syzbot+adbefe6736a5b37af36f19ebfa8764fcdd9ddaed@...kaller.appspotmail.com> To: david@...hat.com, dvyukov@...gle.com, haozhong.zhang@...el.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...hat.com, pbonzini@...hat.com, rkrcmar@...hat.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de Subject: WARNING in do_debug syzkaller has found reproducer for the following crash on 464e1d5f23cca236b930ef068c328a64cab78fb1 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master compiler: gcc (GCC) 7.1.1 20170620 .config is attached Raw console output is attached. C reproducer is attached syzkaller reproducer is attached. See https://goo.gl/kgGztJ for information about syzkaller reproducers WARNING: CPU: 0 PID: 3356 at arch/x86/kernel/traps.c:801 cond_local_irq_disable arch/x86/kernel/traps.c:86 [inline] WARNING: CPU: 0 PID: 3356 at arch/x86/kernel/traps.c:801 do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:815 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 3356 Comm: syzkaller834441 Not tainted 4.15.0-rc5+ #237 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <#DB> __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x211/0x2d0 lib/bug.c:184 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+0x22/0x40 arch/x86/entry/entry_64.S:1061 RIP: 0010:cond_local_irq_disable arch/x86/kernel/traps.c:86 [inline] RIP: 0010:do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:815 RSP: 0018:fffffe800000ee98 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: fffffe800000ef58 RCX: 0000000000000000 RDX: 1fffffd000001dfc RSI: 0000000000000001 RDI: ffffffff85ec81f8 RBP: fffffe800000ef48 R08: fffffe800000efe8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000e003 R13: ffff8801c2340040 R14: 1fffffd000001dd8 R15: 0000000000004000 debug+0x34/0x60 arch/x86/entry/entry_64.S:1214 RIP: 0010:__put_user_8+0x1f/0x25 arch/x86/lib/putuser.S:83 RSP: 0018:ffff8801c9f8ff28 EFLAGS: 00000293 RAX: 000000005a4195b6 RBX: 00007fffffffeff9 RCX: 0000000020000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff8801c9f8ff48 R08: 0000000000000000 R09: 1ffff100393f1fc2 R10: ffff8801c9f8fdd8 R11: 0000000000000000 R12: 000000005a4195b6 R13: 0000000020000000 R14: 00007f2c937f99c0 R15: 0000000000000001 </#DB> entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x44aef9 RSP: 002b:00007f2c937f8ce8 EFLAGS: 00000206 ORIG_RAX: 00000000000000c9 RAX: ffffffffffffffda RBX: 00000000006dcc24 RCX: 000000000044aef9 RDX: 000000000044aef9 RSI: 000000000044aef9 RDI: 0000000020000000 RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffe9191073f R14: 00007f2c937f99c0 R15: 0000000000000001 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. View attachment "config.txt" of type "text/plain" (126387 bytes) Download attachment "raw.log" of type "application/octet-stream" (5669 bytes) View attachment "repro.txt" of type "text/plain" (974 bytes) Download attachment "repro.c" of type "application/octet-stream" (11269 bytes)
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