syzbot


WARNING in kvm_apic_accept_events

Status: upstream: reported C repro on 2025/06/05 13:08
Subsystems: kvm-x86
[Documentation on labels]
Reported-by: syzbot+b1784a9a955885da51cd@syzkaller.appspotmail.com
First crash: 3d09h, last: 3d04h
Cause bisection: failed (error log, bisect log)
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kvm-x86?] WARNING in kvm_apic_accept_events 1 (2) 2025/06/05 13:15
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in kvm_apic_accept_events origin:lts-only C 2 2d12h 3d05h 0/3 upstream: reported C repro on 2025/06/05 13:46

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5846 at arch/x86/kvm/lapic.c:3407 kvm_apic_accept_events+0x341/0x490 arch/x86/kvm/lapic.c:3407
Modules linked in:
CPU: 0 UID: 0 PID: 5846 Comm: syz-executor395 Not tainted 6.15.0-syzkaller-12058-g64980441d269 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kvm_apic_accept_events+0x341/0x490 arch/x86/kvm/lapic.c:3407
Code: eb 0c e8 62 7b 72 00 eb 05 e8 5b 7b 72 00 45 31 ff 44 89 f8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 16 99 1a 0a cc e8 40 7b 72 00 90 <0f> 0b 90 e9 ec fd ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 4f
RSP: 0018:ffffc9000436f5c8 EFLAGS: 00010293
RAX: ffffffff814de090 RBX: 0000000000000002 RCX: ffff88804acd0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81463863
R10: dffffc0000000000 R11: fffffbfff1f4201f R12: 0000000000000002
R13: dffffc0000000000 R14: ffff888033f99c00 R15: ffff888032ed82d8
FS:  000055558d3c3380(0000) GS:ffff888125c55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000bfe000 CR3: 0000000073de4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vcpu_block arch/x86/kvm/x86.c:11298 [inline]
 vcpu_run+0x76f/0x6f70 arch/x86/kvm/x86.c:11335
 kvm_arch_vcpu_ioctl_run+0xfc9/0x1940 arch/x86/kvm/x86.c:11656
 kvm_vcpu_ioctl+0x95c/0xe90 virt/kvm/kvm_main.c:4461
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd5ce9982f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc85c8b9f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007fd5ce9982f9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 0000200000bfe000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc85c8ba20
R13: 0000200000bff000 R14: 0000000000000004 R15: 0000000000000001
 </TASK>

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/05 14:31 upstream 64980441d269 6b6b5f21 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kvm_apic_accept_events
2025/06/05 12:56 upstream 64980441d269 6b6b5f21 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kvm_apic_accept_events
2025/06/05 11:45 upstream 64980441d269 6b6b5f21 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kvm_apic_accept_events
2025/06/05 11:32 upstream 64980441d269 6b6b5f21 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kvm_apic_accept_events
2025/06/05 10:43 upstream 64980441d269 6b6b5f21 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kvm_apic_accept_events
2025/06/05 10:55 upstream ec7714e49479 6b6b5f21 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kvm_apic_accept_events
2025/06/05 10:43 upstream 64980441d269 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kvm_apic_accept_events
2025/06/05 10:43 upstream 64980441d269 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in kvm_apic_accept_events
2025/06/05 09:51 upstream 64980441d269 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kvm_apic_accept_events
2025/06/05 09:51 upstream 64980441d269 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in kvm_apic_accept_events
2025/06/05 10:32 upstream ec7714e49479 6b6b5f21 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kvm_apic_accept_events
2025/06/05 10:31 upstream ec7714e49479 6b6b5f21 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in kvm_apic_accept_events
2025/06/05 09:51 upstream 1af80d00e1e0 6b6b5f21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in kvm_apic_accept_events
2025/06/05 12:36 linux-next 4f27f06ec121 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kvm_apic_accept_events
2025/06/05 12:36 linux-next 4f27f06ec121 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in kvm_apic_accept_events
* Struck through repros no longer work on HEAD.