syzbot


BUG: unable to handle kernel paging request in wait_lapic_expire

Status: closed as dup on 2017/12/19 12:14
Subsystems: kvm
[Documentation on labels]
Reported-by: syzbot+51154054bce9a47d13fe39992500c94154513813@syzkaller.appspotmail.com
First crash: 2579d, last: 2578d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
BUG: unable to handle kernel paging request in __switch_to kernel 1 2578d 2574d

Sample crash report:
BUG: unable to handle kernel paging request at fffffffffffffff8
IP: wait_lapic_expire+0x98/0x7f0 arch/x86/kvm/lapic.c:1396
PGD 5e28067 P4D 5e28067 PUD 5e2a067 PMD 0 
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4463 Comm: syz-executor4 Not tainted 4.15.0-rc1-next-20171129+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cde40380 task.stack: ffff8801ced38000
RIP: 0010:wait_lapic_expire+0x98/0x7f0 arch/x86/kvm/lapic.c:1396
RSP: 0018:ffff8801ced3f5c0 EFLAGS: 00010046
RAX: 1ffff1003a0ce0f4 RBX: 1ffff10039da7ebb RCX: ffffffff81167488
RDX: 000000000000284c RSI: ffffc900030e0000 RDI: ffff8801d06707a0
RBP: ffff8801ced3f6a0 R08: ffff88018f4adf58 R09: 1ffff10039da7eaf
R10: ffff8801cde40380 R11: 0000000000000001 R12: ffff8801d06b12c0
R13: ffff8801d06703c0 R14: ffff8801d06703f0 R15: ffff8801d06703c0
FS:  00007f4acd2f5700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 00000001d1531000 CR4: 00000000001426f0
Call Trace:
 vcpu_enter_guest arch/x86/kvm/x86.c:7011 [inline]
 vcpu_run arch/x86/kvm/x86.c:7146 [inline]
 kvm_arch_vcpu_ioctl_run+0x182c/0x5c60 arch/x86/kvm/x86.c:7314
 kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2574
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007f4acd2f4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 00000000004529d9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000001a
RBP: 0000000000000214 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f0280
R13: 00000000ffffffff R14: 00007f4acd2f56d4 R15: 0000000000000021
Code: 40 10 f3 f3 f3 f3 e8 88 c6 59 00 49 8d bd e0 03 00 00 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 f2 06 00 00 4d 8b a5 e0 03 00 00 <cc> 1f 44 00 00 e8 5e c6 59 00 4d 8d 7c 24 70 e8 54 c6 59 00 4c 
RIP: wait_lapic_expire+0x98/0x7f0 arch/x86/kvm/lapic.c:1396 RSP: ffff8801ced3f5c0
CR2: fffffffffffffff8
---[ end trace ce0f60eca9bd2476 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/11/29 14:38 linux-next d127129e85a0 29b0fd90 .config console log report ci-upstream-next-kasan-gce
2017/11/29 04:27 mmots a4f586bceda4 34f2c233 .config console log report ci-upstream-mmots-kasan-gce
* Struck through repros no longer work on HEAD.