linux-kernel - [syzbot] WARNING in fuse_writepages

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Message-ID: <00000000000085145205cebf0e87@google.com>
Date:   Tue, 19 Oct 2021 18:54:21 -0700
From:   syzbot <syzbot+29e1f6075bbe07b2beb6@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        miklos@...redi.hu, mszeredi@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING in fuse_writepages_fill

Hello,

syzbot found the following issue on:

HEAD commit:    7c832d2f9b95 Add linux-next specific files for 20211015
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12e15a10b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f6ac42766a768877
dashboard link: https://syzkaller.appspot.com/bug?extid=29e1f6075bbe07b2beb6
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=13715144b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b749ccb00000

The issue was bisected to:

commit 6e6b45a963c4a962c61ca59982982ddcdc82e651
Author: Miklos Szeredi <mszeredi@...hat.com>
Date:   Wed Oct 13 12:33:40 2021 +0000

    fuse: write inode in fuse_vma_close() instead of fuse_release()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=133b0194b00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10bb0194b00000
console output: https://syzkaller.appspot.com/x/log.txt?x=173b0194b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+29e1f6075bbe07b2beb6@...kaller.appspotmail.com
Fixes: 6e6b45a963c4 ("fuse: write inode in fuse_vma_close() instead of fuse_release()")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 54 at fs/fuse/file.c:1829 fuse_write_file_get fs/fuse/file.c:1829 [inline]
WARNING: CPU: 0 PID: 54 at fs/fuse/file.c:1829 fuse_write_file_get fs/fuse/file.c:1826 [inline]
WARNING: CPU: 0 PID: 54 at fs/fuse/file.c:1829 fuse_writepages_fill+0x1591/0x1a40 fs/fuse/file.c:2134
Modules linked in:
CPU: 0 PID: 54 Comm: kworker/u4:3 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-0:50)
RIP: 0010:fuse_write_file_get fs/fuse/file.c:1829 [inline]
RIP: 0010:fuse_write_file_get fs/fuse/file.c:1826 [inline]
RIP: 0010:fuse_writepages_fill+0x1591/0x1a40 fs/fuse/file.c:2134
Code: ff 4c 89 f7 e8 90 3c 0f ff e9 71 ec ff ff e8 86 3c 0f ff e9 98 ec ff ff e8 dc a9 c8 fe 4c 89 ff e8 84 82 a1 06 e8 cf a9 c8 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 10 48 c1 ea 03 80
RSP: 0018:ffffc90001a2f428 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc90001a2f680 RCX: 0000000000000000
RDX: ffff888011ba5700 RSI: ffffffff82aebac1 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88806eee85e3
R10: ffffed100dddd0bc R11: 0000000000000000 R12: ffffea0001b04240
R13: ffffc90001a2f690 R14: ffff88806eee84c8 R15: ffff88806eee85e0
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000019b88000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 write_cache_pages+0x6f4/0x10c0 mm/page-writeback.c:2255
 fuse_writepages+0x1c9/0x320 fs/fuse/file.c:2236
 do_writepages+0x1a4/0x670 mm/page-writeback.c:2364
 __writeback_single_inode+0x126/0xff0 fs/fs-writeback.c:1616
 writeback_sb_inodes+0x53d/0xf00 fs/fs-writeback.c:1881
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1950
 wb_writeback+0x7f1/0xc30 fs/fs-writeback.c:2055
 wb_check_background_flush fs/fs-writeback.c:2121 [inline]
 wb_do_writeback fs/fs-writeback.c:2209 [inline]
 wb_workfn+0xa21/0x1180 fs/fs-writeback.c:2237
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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