syzbot


possible deadlock in ntfs_set_size (2)

Status: upstream: reported on 2024/05/28 20:40
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+516b0263e31e4b561fdd@syzkaller.appspotmail.com
First crash: 21d, last: 21d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs3?] possible deadlock in ntfs_set_size (2) 0 (1) 2024/05/28 20:40
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in ntfs_set_size ntfs3 1 210d 206d 0/27 auto-obsoleted due to no activity on 2024/02/26 05:10

Sample crash report:
ntfs3: loop2: Different NTFS sector size (4096) and media sector size (512).
ntfs3: loop2: Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller-12220-g02c438bbfffe #0 Not tainted
------------------------------------------------------
syz-executor.2/10627 is trying to acquire lock:
ffffffff8dd3a860 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:334 [inline]
ffffffff8dd3a860 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3890 [inline]
ffffffff8dd3a860 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3980 [inline]
ffffffff8dd3a860 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4120 [inline]
ffffffff8dd3a860 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_node_noprof+0xbb/0x450 mm/slub.c:4128

but task is already holding lock:
ffff888028cef050 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x119/0x220 fs/ntfs3/inode.c:843

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ni->file.run_lock#2){++++}-{3:3}:
       down_read+0x9a/0x330 kernel/locking/rwsem.c:1526
       mi_read+0x301/0x660 fs/ntfs3/record.c:129
       mi_format_new+0x376/0x540 fs/ntfs3/record.c:420
       ni_add_subrecord+0xd1/0x4f0 fs/ntfs3/frecord.c:372
       ntfs_look_free_mft+0x209/0xdd0 fs/ntfs3/fsntfs.c:715
       ni_create_attr_list+0x75b/0x1280 fs/ntfs3/frecord.c:876
       ni_ins_attr_ext+0x236/0xae0 fs/ntfs3/frecord.c:974
       ni_insert_attr+0x305/0x820 fs/ntfs3/frecord.c:1141
       ni_insert_resident+0xd2/0x3a0 fs/ntfs3/frecord.c:1525
       ni_add_name+0x48b/0x820 fs/ntfs3/frecord.c:3047
       ni_rename+0xa1/0x1a0 fs/ntfs3/frecord.c:3087
       ntfs_rename+0x96f/0xf20 fs/ntfs3/namei.c:334
       vfs_rename+0xf84/0x20a0 fs/namei.c:4887
       do_renameat2+0xc54/0xdc0 fs/namei.c:5044
       __do_sys_rename fs/namei.c:5091 [inline]
       __se_sys_rename fs/namei.c:5089 [inline]
       __ia32_sys_rename+0x80/0xa0 fs/namei.c:5089
       do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
       __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
       do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
       entry_SYSENTER_compat_after_hwframe+0x84/0x8e

-> #1 (&wnd->rw_lock/1){+.+.}-{3:3}:
       down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695
       ntfs_mark_rec_free+0x2f4/0x400 fs/ntfs3/fsntfs.c:742
       ni_delete_all+0x6ad/0x880 fs/ntfs3/frecord.c:1637
       ni_clear+0x519/0x6a0 fs/ntfs3/frecord.c:106
       evict+0x2ed/0x6c0 fs/inode.c:667
       iput_final fs/inode.c:1741 [inline]
       iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
       iput+0x5c/0x80 fs/inode.c:1757
       dentry_unlink_inode+0x295/0x480 fs/dcache.c:400
       __dentry_kill+0x1d0/0x600 fs/dcache.c:603
       shrink_kill fs/dcache.c:1048 [inline]
       shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075
       prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156
       super_cache_scan+0x32a/0x550 fs/super.c:221
       do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435
       shrink_slab_memcg mm/shrinker.c:548 [inline]
       shrink_slab+0xa87/0x1310 mm/shrinker.c:626
       shrink_one+0x493/0x7c0 mm/vmscan.c:4790
       shrink_many mm/vmscan.c:4851 [inline]
       lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
       shrink_node mm/vmscan.c:5910 [inline]
       kswapd_shrink_node mm/vmscan.c:6720 [inline]
       balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
       kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
       kthread+0x2c1/0x3a0 kernel/kthread.c:389
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 (fs_reclaim){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       __fs_reclaim_acquire mm/page_alloc.c:3783 [inline]
       fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3797
       might_alloc include/linux/sched/mm.h:334 [inline]
       slab_pre_alloc_hook mm/slub.c:3890 [inline]
       slab_alloc_node mm/slub.c:3980 [inline]
       __do_kmalloc_node mm/slub.c:4120 [inline]
       __kmalloc_node_noprof+0xbb/0x450 mm/slub.c:4128
       kmalloc_node_noprof include/linux/slab.h:681 [inline]
       kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:634
       run_add_entry+0x7ba/0xb00 fs/ntfs3/run.c:389
       attr_allocate_clusters+0x213/0x720 fs/ntfs3/attrib.c:181
       attr_set_size+0x142e/0x2b90 fs/ntfs3/attrib.c:572
       ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:845
       ntfs_extend+0x401/0x570 fs/ntfs3/file.c:335
       ntfs_file_write_iter+0x433/0x2050 fs/ntfs3/file.c:1115
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0x6b6/0x1140 fs/read_write.c:590
       ksys_write+0x12f/0x260 fs/read_write.c:643
       do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
       __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
       do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
       entry_SYSENTER_compat_after_hwframe+0x84/0x8e

other info that might help us debug this:

Chain exists of:
  fs_reclaim --> &wnd->rw_lock/1 --> &ni->file.run_lock#2

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ni->file.run_lock#2);
                               lock(&wnd->rw_lock/1);
                               lock(&ni->file.run_lock#2);
  lock(fs_reclaim);

 *** DEADLOCK ***

5 locks held by syz-executor.2/10627:
 #0: ffff88801de9f048 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xeb/0x180 fs/file.c:1191
 #1: ffff88802bf00420 (sb_writers#21){.+.+}-{0:0}, at: ksys_write+0x12f/0x260 fs/read_write.c:643
 #2: ffff888028cef240 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:811 [inline]
 #2: ffff888028cef240 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: ntfs_file_write_iter+0x2db/0x2050 fs/ntfs3/file.c:1093
 #3: ffff888028ceefa0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
 #3: ffff888028ceefa0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_set_size+0x111/0x220 fs/ntfs3/inode.c:842
 #4: ffff888028cef050 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x119/0x220 fs/ntfs3/inode.c:843

stack backtrace:
CPU: 3 PID: 10627 Comm: syz-executor.2 Not tainted 6.9.0-syzkaller-12220-g02c438bbfffe #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __fs_reclaim_acquire mm/page_alloc.c:3783 [inline]
 fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3797
 might_alloc include/linux/sched/mm.h:334 [inline]
 slab_pre_alloc_hook mm/slub.c:3890 [inline]
 slab_alloc_node mm/slub.c:3980 [inline]
 __do_kmalloc_node mm/slub.c:4120 [inline]
 __kmalloc_node_noprof+0xbb/0x450 mm/slub.c:4128
 kmalloc_node_noprof include/linux/slab.h:681 [inline]
 kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:634
 run_add_entry+0x7ba/0xb00 fs/ntfs3/run.c:389
 attr_allocate_clusters+0x213/0x720 fs/ntfs3/attrib.c:181
 attr_set_size+0x142e/0x2b90 fs/ntfs3/attrib.c:572
 ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:845
 ntfs_extend+0x401/0x570 fs/ntfs3/file.c:335
 ntfs_file_write_iter+0x433/0x2050 fs/ntfs3/file.c:1115
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7330579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f225ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000100
RDX: 0000000000000020 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/24 20:30 upstream 02c438bbfffe c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in ntfs_set_size
* Struck through repros no longer work on HEAD.