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WARNING in __kvm_gpc_refresh (3)

Status: upstream: reported C repro on 2025/01/02 09:06
Subsystems: kvm
[Documentation on labels]
Reported-by: syzbot+cde12433b6c56f55d9ed@syzkaller.appspotmail.com
First crash: 304d, last: 7h04m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[syzbot] Monthly kvm report (Oct 2025) 0 (1) 2025/10/10 07:32
[syzbot] Monthly kvm report (Sep 2025) 0 (1) 2025/09/01 07:38
[syzbot] Monthly kvm report (May 2025) 0 (1) 2025/05/12 13:34
[syzbot] [kvm?] WARNING in __kvm_gpc_refresh (3) 0 (2) 2025/02/26 17:36
[syzbot] Monthly kvm report (Jan 2025) 0 (1) 2025/01/13 10:54
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __kvm_gpc_refresh kvm -1 C 178 526d 590d 25/29 fixed on 2024/05/22 23:08
upstream WARNING in __kvm_gpc_refresh (2) kvm -1 C error 2 505d 519d 27/29 fixed on 2024/08/14 03:44
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2025/10/16 08:13 19m retest repro linux-next report log
2025/10/16 08:13 20m retest repro linux-next report log
2025/10/02 04:33 14m retest repro upstream report log
2025/08/02 09:16 8m retest repro linux-next error
2025/07/24 22:37 24m retest repro linux-next error
2025/07/10 17:28 42m retest repro upstream report log
2025/05/23 13:30 17m retest repro linux-next report log
2025/03/12 17:51 23m retest repro linux-next error

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5497 at arch/x86/kvm/../../../virt/kvm/pfncache.c:267 __kvm_gpc_refresh+0x1187/0x1310 virt/kvm/pfncache.c:267
Modules linked in:
CPU: 0 UID: 0 PID: 5497 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__kvm_gpc_refresh+0x1187/0x1310 virt/kvm/pfncache.c:267
Code: c6 05 ec 32 27 0e 01 48 c7 c7 1c bb 6f 8d be 35 04 00 00 48 c7 c2 40 ea 61 8b e8 f4 d0 5d 00 e9 fe f1 ff ff e8 ca 67 80 00 90 <0f> 0b 90 bb ea ff ff ff e9 7e fe ff ff e8 b7 67 80 00 90 0f 0b 90
RSP: 0018:ffffc9000cb8f360 EFLAGS: 00010293
RAX: ffffffff813fac46 RBX: ffff888000000000 RCX: ffff8880002e2480
RDX: 0000000000000000 RSI: ffff888000000000 RDI: ffff888000000000
RBP: ffffc9000cb8f4e8 R08: ffffffff8f7cf477 R09: 1ffffffff1ef9e8e
R10: dffffc0000000000 R11: fffffbfff1ef9e8f R12: ffff8880368793e0
R13: dffffc0000000000 R14: ffff888000000000 R15: ffffffffffffff01
FS:  000055557b0a0500(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f447fb56e9c CR3: 00000000591c3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kvm_gpc_refresh+0xe1/0x140 virt/kvm/pfncache.c:382
 kvm_xen_set_evtchn+0x164/0x230 arch/x86/kvm/xen.c:1943
 kvm_xen_inject_timer_irqs+0xfd/0x200 arch/x86/kvm/xen.c:118
 vcpu_run+0xc2c/0x7040 arch/x86/kvm/x86.c:11625
 kvm_arch_vcpu_ioctl_run+0xfc9/0x1940 arch/x86/kvm/x86.c:11951
 kvm_vcpu_ioctl+0x95c/0xe90 virt/kvm/kvm_main.c:4476
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb6218efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe67f6e7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007feb623e5fa0 RCX: 00007feb6218efc9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00007feb62211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feb623e5fa0 R14: 00007feb623e5fa0 R15: 0000000000000003
 </TASK>

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/26 23:54 upstream dbfc6422a34d c0460fcd .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __kvm_gpc_refresh
2025/06/25 15:49 upstream 7595b66ae9de 26d77996 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/10/27 03:31 linux-next 72fb0170ef1f c0460fcd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in __kvm_gpc_refresh
2025/06/26 17:13 linux-next ecb259c4f70d 26d77996 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in __kvm_gpc_refresh
2025/02/26 17:35 linux-next e5d3fd687aac d34966d1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __kvm_gpc_refresh
2025/05/08 06:13 upstream 707df3375124 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __kvm_gpc_refresh
2025/10/29 18:34 upstream e53642b87a4f fd2207e7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/10/26 23:16 upstream dbfc6422a34d c0460fcd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __kvm_gpc_refresh
2025/09/18 04:30 upstream d4b779985a6c e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/09/14 17:01 upstream f83a4f2a4d8c e2beed91 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/08/27 05:25 upstream fab1beda7597 e12e5ba4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __kvm_gpc_refresh
2025/08/19 15:54 upstream be48bcf004f9 523f460e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in __kvm_gpc_refresh
2025/06/25 15:40 upstream 7595b66ae9de 26d77996 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/06/25 15:39 upstream 7595b66ae9de 26d77996 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/05/09 05:15 upstream 2c89c1b655c0 bb813bcc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/01/24 08:44 upstream 8883957b3c9d 521b0ce3 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2024/12/29 08:58 upstream 059dd502b263 d3ccff63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __kvm_gpc_refresh
2025/10/29 16:35 linux-next f9ba12abc528 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in __kvm_gpc_refresh
2025/10/27 14:53 linux-next 8fec172c82c2 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in __kvm_gpc_refresh
2025/06/06 03:46 linux-next 4f27f06ec121 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __kvm_gpc_refresh
2025/02/26 16:08 linux-next e5d3fd687aac d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __kvm_gpc_refresh
* Struck through repros no longer work on HEAD.