Message-ID: <000000000000b6df0f05dab7e92c@google.com>
Date:   Mon, 21 Mar 2022 03:25:18 -0700
From:   syzbot <syzbot+6bde52d89cfdf9f61425@...kaller.appspotmail.com>
To:     agordeev@...ux.ibm.com, aleksandar.qemu.devel@...il.com,
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Subject: [syzbot] WARNING in kvm_mmu_notifier_invalidate_range_start (2)

Hello,

syzbot found the following issue on:

HEAD commit:    56e337f2cf13 Revert "gpio: Revert regression in sysfs-gpio..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13821b8d700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d35f9bc6884af6c9
dashboard link: https://syzkaller.appspot.com/bug?extid=6bde52d89cfdf9f61425
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a2d0a9700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d34fd9700000

The issue was bisected to:

commit ed922739c9199bf515a3e7fec3e319ce1edeef2a
Author: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>
Date:   Mon Dec 6 19:54:28 2021 +0000

    KVM: Use interval tree to do fast hva lookup in memslots

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=142aa59d700000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=162aa59d700000
console output: https://syzkaller.appspot.com/x/log.txt?x=122aa59d700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6bde52d89cfdf9f61425@...kaller.appspotmail.com
Fixes: ed922739c919 ("KVM: Use interval tree to do fast hva lookup in memslots")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3599 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:529 __kvm_handle_hva_range arch/x86/kvm/../../../virt/kvm/kvm_main.c:529 [inline]
WARNING: CPU: 0 PID: 3599 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:529 kvm_mmu_notifier_invalidate_range_start+0x97a/0xb20 arch/x86/kvm/../../../virt/kvm/kvm_main.c:714
Modules linked in:
CPU: 0 PID: 3599 Comm: syz-executor221 Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__kvm_handle_hva_range arch/x86/kvm/../../../virt/kvm/kvm_main.c:529 [inline]
RIP: 0010:kvm_mmu_notifier_invalidate_range_start+0x97a/0xb20 arch/x86/kvm/../../../virt/kvm/kvm_main.c:714
Code: 00 48 c7 c2 60 0c a2 89 be b9 01 00 00 48 c7 c7 c0 10 a2 89 c6 05 ed 71 76 0c 01 e8 79 84 ff 07 e9 73 ff ff ff e8 b6 cd 6f 00 <0f> 0b e9 88 fc ff ff e8 aa cd 6f 00 0f 0b e9 58 fc ff ff e8 9e cd
RSP: 0018:ffffc90001caf948 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000002000d000 RCX: 0000000000000000
RDX: ffff888020d83a00 RSI: ffffffff8108f27a RDI: 0000000000000003
RBP: ffffc90002b76290 R08: 000000002000d000 R09: ffffc90002b762e3
R10: ffffffff8108eb1c R11: 0000000000000001 R12: ffffc90002b7f240
R13: ffffc90002b75000 R14: ffffc90001cafc18 R15: 000000002000d000
FS:  0000555555a55300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000088 CR3: 0000000074ce9000 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+0x2ff/0x800 mm/mmu_notifier.c:548
 mmu_notifier_invalidate_range_start include/linux/mmu_notifier.h:459 [inline]
 move_page_tables+0x2642/0x2d20 mm/mremap.c:498
 move_vma+0x48c/0xf40 mm/mremap.c:629
 mremap_to mm/mremap.c:862 [inline]
 __do_sys_mremap+0xf01/0x1560 mm/mremap.c:972
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f11faab5089
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc17608428 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f11faab5089
RDX: 0000000000001000 RSI: fffffffffffffe74 RDI: 000000002000d000
RBP: 00007f11faa79070 R08: 0000000020007000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007f11faa79100
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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