linux-kernel - [syzbot] kernel BUG in __ntfs_grab_cache

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Date:   Mon, 26 Sep 2022 10:05:46 -0700
From:   syzbot <syzbot+01b3ade7c86f7dd584d7@...kaller.appspotmail.com>
To:     anton@...era.com, linux-kernel@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] kernel BUG in __ntfs_grab_cache_pages

Hello,

syzbot found the following issue on:

HEAD commit:    c194837ebb57 Merge branch 'for-next/core', remote-tracking..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=138cb7f8880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=15a770deac0c935a
dashboard link: https://syzkaller.appspot.com/bug?extid=01b3ade7c86f7dd584d7
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d1d188880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1472a6ef080000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8d8ae425e7fa/disk-c194837e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c540d501ebe7/vmlinux-c194837e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+01b3ade7c86f7dd584d7@...kaller.appspotmail.com

 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190
------------[ cut here ]------------
kernel BUG at fs/ntfs/file.c:493!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3045 Comm: syz-executor202 Not tainted 6.0.0-rc6-syzkaller-17742-gc194837ebb57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __ntfs_grab_cache_pages+0x30c/0x328 fs/ntfs/file.c:493
lr : __ntfs_grab_cache_pages+0x30c/0x328 fs/ntfs/file.c:493
sp : ffff80000fb5baa0
x29: ffff80000fb5baa0 x28: ffff0000caa2ec80 x27: ffff80000fb5bb70
x26: 00000000ffffffff x25: ffff0000caa2f1c8 x24: 0000000000000000
x23: 0000000000000000 x22: ffff80000fb5bb68 x21: ffff0000caa2ec80
x20: 0000000000000000 x19: ffff80000fb5bb70 x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c47b1a80
x14: 0000000000000030 x13: 00000000ffffffff x12: ffff0000c47b1a80
x11: ff80800008b9dcb0 x10: 0000000000000000 x9 : ffff800008b9dcb0
x8 : ffff0000c47b1a80 x7 : ffff80000846b9dc x6 : 0000000000000000
x5 : 0000000000000000 x4 : ffff80000fb5bb68 x3 : ffff80000fb5bb70
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 __ntfs_grab_cache_pages+0x30c/0x328 fs/ntfs/file.c:493
 ntfs_perform_write+0x224/0xa98 fs/ntfs/file.c:1833
 ntfs_file_write_iter+0x2c4/0x4f0 fs/ntfs/file.c:1917
 call_write_iter include/linux/fs.h:2187 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x2dc/0x46c fs/read_write.c:578
 ksys_write+0xb4/0x160 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __arm64_sys_write+0x24/0x34 fs/read_write.c:640
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190
Code: 17ffff88 97dc0a06 17ffff86 97dc0a04 (d4210000) 
---[ end trace 0000000000000000 ]---


---
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