linux-kernel - Re: [syzbot] [ntfs3?] possible deadlock in ntfs_set

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Message-ID: <0000000000008325b70611416f20@google.com>
Date: Tue, 13 Feb 2024 03:10:01 -0800
From: syzbot <syzbot+c2ada45c23d98d646118@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] possible deadlock in ntfs_set_state (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
possible deadlock in ntfs_set_state

loop0: detected capacity change from 0 to 4096
ntfs3: loop0: Different NTFS sector size (4096) and media sector size (512).
ntfs3: loop0: ino=5, "/" ntfs_iget5
============================================
WARNING: possible recursive locking detected
6.8.0-rc4-syzkaller-00005-gc664e16bb1ba-dirty #0 Not tainted
--------------------------------------------
syz-executor.0/5514 is trying to acquire lock:
ffff888068bf8100 (&ni->ni_lock#3){+.+.}-{3:3}, at: ntfs_set_state+0x1ff/0x6c0 fs/ntfs3/fsntfs.c:947

but task is already holding lock:
ffff888068bf9e80 (&ni->ni_lock#3){+.+.}-{3:3}, at: ni_trylock fs/ntfs3/ntfs_fs.h:1141 [inline]
ffff888068bf9e80 (&ni->ni_lock#3){+.+.}-{3:3}, at: ni_write_inode+0x1bc/0x1010 fs/ntfs3/frecord.c:3264

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&ni->ni_lock#3);
  lock(&ni->ni_lock#3);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by syz-executor.0/5514:
 #0: ffff88802ec00420 (sb_writers#13){.+.+}-{0:0}, at: do_sys_ftruncate+0x25c/0x390 fs/open.c:191
 #1: ffff888068bfa120 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #1: ffff888068bfa120 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: do_truncate+0x20c/0x310 fs/open.c:64
 #2: ffff888068bf9e80 (&ni->ni_lock#3){+.+.}-{3:3}, at: ni_trylock fs/ntfs3/ntfs_fs.h:1141 [inline]
 #2: ffff888068bf9e80 (&ni->ni_lock#3){+.+.}-{3:3}, at: ni_write_inode+0x1bc/0x1010 fs/ntfs3/frecord.c:3264

stack backtrace:
CPU: 0 PID: 5514 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller-00005-gc664e16bb1ba-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain+0x15c0/0x58e0 kernel/locking/lockdep.c:3856
 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 ntfs_set_state+0x1ff/0x6c0 fs/ntfs3/fsntfs.c:947
 ntfs_iget5+0x3f0/0x3b70 fs/ntfs3/inode.c:535
 ni_update_parent+0x934/0xdc0 fs/ntfs3/frecord.c:3217
 ni_write_inode+0xde9/0x1010 fs/ntfs3/frecord.c:3323
 ntfs_truncate fs/ntfs3/file.c:410 [inline]
 ntfs3_setattr+0x950/0xb40 fs/ntfs3/file.c:703
 notify_change+0xb9f/0xe70 fs/attr.c:499
 do_truncate+0x220/0x310 fs/open.c:66
 do_sys_ftruncate+0x2f7/0x390 fs/open.c:194
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f8b46a7dda9
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:00007f8b478530c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f8b46babf80 RCX: 00007f8b46a7dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f8b46aca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8b46babf80 R15: 00007ffcddaf9d18
 </TASK>
ntfs3: loop0: Mark volume as dirty due to NTFS errors


Tested on:

commit:         c664e16b Merge tag 'docs-6.8-fixes2' of git://git.lwn...
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=152c5114180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1d7c92dd8d5c7a1e
dashboard link: https://syzkaller.appspot.com/bug?extid=c2ada45c23d98d646118
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15ff6de0180000