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Date:   Wed, 15 Nov 2023 05:32:19 -0800
Message-ID: <000000000000b0e576060a30ee3b@google.com>
Subject: [syzbot] [mm?] WARNING in unmap_page_range (2)
From:   syzbot <syzbot+7ca4b2719dc742b8d0a4@syzkaller.appspotmail.com>
To:     akpm@linux-foundation.org, david@redhat.com,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, syzkaller-bugs@googlegroups.com,
        usama.anjum@collabora.com, wangkefeng.wang@huawei.com
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Hello,

syzbot found the following issue on:

HEAD commit:    ac347a0655db Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15ff3057680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=287570229f5c0a7c
dashboard link: https://syzkaller.appspot.com/bug?extid=7ca4b2719dc742b8d0a4
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=162a25ff680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d62338e80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/00e30e1a5133/disk-ac347a06.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/07c43bc37935/vmlinux-ac347a06.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c6690c715398/bzImage-ac347a06.xz

The issue was bisected to:

commit 12f6b01a0bcbeeab8cc9305673314adb3adf80f7
Author: Muhammad Usama Anjum <usama.anjum@collabora.com>
Date:   Mon Aug 21 14:15:15 2023 +0000

    fs/proc/task_mmu: add fast paths to get/clear PAGE_IS_WRITTEN flag

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14e5591f680000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=16e5591f680000
console output: https://syzkaller.appspot.com/x/log.txt?x=12e5591f680000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7ca4b2719dc742b8d0a4@syzkaller.appspotmail.com
Fixes: 12f6b01a0bcb ("fs/proc/task_mmu: add fast paths to get/clear PAGE_IS_WRITTEN flag")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5059 at mm/memory.c:1520 zap_pte_range mm/memory.c:1520 [inline]
WARNING: CPU: 0 PID: 5059 at mm/memory.c:1520 zap_pmd_range mm/memory.c:1582 [inline]
WARNING: CPU: 0 PID: 5059 at mm/memory.c:1520 zap_pud_range mm/memory.c:1611 [inline]
WARNING: CPU: 0 PID: 5059 at mm/memory.c:1520 zap_p4d_range mm/memory.c:1632 [inline]
WARNING: CPU: 0 PID: 5059 at mm/memory.c:1520 unmap_page_range+0x1711/0x2c00 mm/memory.c:1653
Modules linked in:
CPU: 0 PID: 5059 Comm: syz-executor416 Not tainted 6.6.0-syzkaller-16039-gac347a0655db #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:zap_pte_range mm/memory.c:1520 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1582 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1611 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1632 [inline]
RIP: 0010:unmap_page_range+0x1711/0x2c00 mm/memory.c:1653
Code: 0f 8e 4a 12 00 00 48 8b 44 24 30 31 ff 0f b6 58 08 89 de e8 d1 00 bf ff 84 db 0f 85 88 f3 ff ff e9 0a f4 ff ff e8 8f 05 bf ff <0f> 0b e9 77 f3 ff ff e8 83 05 bf ff 48 83 44 24 10 08 e9 9d f6 ff
RSP: 0018:ffffc900034bf8f8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000007 RCX: ffffffff81c894fd
RDX: ffff88801ff66040 RSI: ffffffff81c89561 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888074017008 R14: dffffc0000000000 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70d28ca0d0 CR3: 000000001d5be000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1699
 unmap_vmas+0x229/0x470 mm/memory.c:1743
 exit_mmap+0x1ad/0xa60 mm/mmap.c:3308
 __mmput+0x12a/0x4d0 kernel/fork.c:1349
 mmput+0x62/0x70 kernel/fork.c:1371
 exit_mm kernel/exit.c:567 [inline]
 do_exit+0x9ad/0x2ae0 kernel/exit.c:858
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1030
 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: 0033:0x7f70d284ef39
Code: Unable to access opcode bytes at 0x7f70d284ef0f.
RSP: 002b:00007ffc9cfa2fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f70d284ef39
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007f70d28c9270 R08: ffffffffffffffb8 R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f70d28c9270
R13: 0000000000000000 R14: 00007f70d28c9cc0 R15: 00007f70d2820ae0
 </TASK>


---
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