linux-kernel - Re: [syzbot] [kvm?] WARNING in kvm_mmu_notifier_invalidate_range

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Message-ID: <0000000000000e6813060a5755f1@google.com>
Date:   Fri, 17 Nov 2023 03:21:05 -0800
From:   syzbot <syzbot+c74f40907a9c0479af10@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tintinm2017@...il.com
Subject: Re: [syzbot] [kvm?] WARNING in kvm_mmu_notifier_invalidate_range_start
 (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in kvm_mmu_notifier_invalidate_range_start

kvm_intel: L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5493 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:592 __kvm_handle_hva_range arch/x86/kvm/../../../virt/kvm/kvm_main.c:592 [inline]
WARNING: CPU: 1 PID: 5493 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:592 kvm_mmu_notifier_invalidate_range_start+0x91b/0xa90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:811
Modules linked in:
CPU: 1 PID: 5493 Comm: syz-executor.0 Not tainted 6.7.0-rc1-syzkaller-00125-g7475e51b8796 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__kvm_handle_hva_range arch/x86/kvm/../../../virt/kvm/kvm_main.c:592 [inline]
RIP: 0010:kvm_mmu_notifier_invalidate_range_start+0x91b/0xa90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:811
Code: 1b 8c 7e 00 45 84 e4 0f 85 9f f8 ff ff e8 dd 90 7e 00 0f 0b e9 93 f8 ff ff e8 d1 90 7e 00 0f 0b e9 d9 fd ff ff e8 c5 90 7e 00 <0f> 0b e9 e6 fc ff ff e8 b9 90 7e 00 0f 0b e9 a9 fc ff ff e8 ad 90
RSP: 0018:ffffc900053a7ac8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000020ffc000 RCX: ffffffff810a0d7b
RDX: ffff88802a5f3b80 RSI: ffffffff810a141b RDI: 0000000000000006
RBP: ffffc900053a7d60 R08: 0000000000000006 R09: 0000000020ffc000
R10: 0000000020ffc000 R11: ffffffff9160a110 R12: ffffc90002de6a30
R13: 0000000000000001 R14: 0000000020ffc000 R15: ffffc90002def810
FS:  00007fd41f5c36c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd41f5c2f78 CR3: 0000000020bf3000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mn_hlist_invalidate_range_start mm/mmu_notifier.c:493 [inline]
 __mmu_notifier_invalidate_range_start+0x3b5/0x8e0 mm/mmu_notifier.c:548
 mmu_notifier_invalidate_range_start include/linux/mmu_notifier.h:457 [inline]
 do_pagemap_scan+0xbd3/0xcc0 fs/proc/task_mmu.c:2422
 do_pagemap_cmd+0x5e/0x80 fs/proc/task_mmu.c:2478
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fd41e87cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd41f5c30c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd41e99bf80 RCX: 00007fd41e87cae9
RDX: 0000000020000040 RSI: 00000000c0606610 RDI: 0000000000000005
RBP: 00007fd41e8c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd41e99bf80 R15: 00007ffeb2042478
 </TASK>


Tested on:

commit:         7475e51b Merge tag 'net-6.7-rc2' of git://git.kernel.o..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=151eb384e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c8be8f62c2cfe457
dashboard link: https://syzkaller.appspot.com/bug?extid=c74f40907a9c0479af10
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.