[syzbot] [ntfs3?] possible deadlock in ntfs_set_size

From: syzbot
Date: Wed Nov 22 2023 - 00:21:28 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 791c8ab095f7 Merge tag 'bcachefs-2023-11-17' of https://ev..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1294d267680000
kernel config: https://syzkaller.appspot.com/x/.config?x=84217b7fc4acdc59
dashboard link: https://syzkaller.appspot.com/bug?extid=18f543fc90dd1194c616
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-791c8ab0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e433bf284ce1/vmlinux-791c8ab0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ef2e25e71c51/bzImage-791c8ab0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+18f543fc90dd1194c616@xxxxxxxxxxxxxxxxxxxxxxxxx

======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc1-syzkaller-00213-g791c8ab095f7 #0 Not tainted
------------------------------------------------------
syz-executor.1/29095 is trying to acquire lock:
ffffffff8d11bae0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline]
ffffffff8d11bae0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:710 [inline]
ffffffff8d11bae0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3460 [inline]
ffffffff8d11bae0 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517

but task is already holding lock:
ffff8880241bf050 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x119/0x220 fs/ntfs3/inode.c:838

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+0x301/0x650 fs/ntfs3/record.c:129
mi_format_new+0x39c/0x580 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+0x93b/0x1520 fs/ntfs3/frecord.c:876
ni_ins_attr_ext+0x23f/0xaf0 fs/ntfs3/frecord.c:974
ni_insert_attr+0x310/0x870 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+0x91f/0xec0 fs/ntfs3/namei.c:322
vfs_rename+0xe23/0x1c30 fs/namei.c:4844
do_renameat2+0xc3c/0xdc0 fs/namei.c:4996
__do_sys_rename fs/namei.c:5042 [inline]
__se_sys_rename fs/namei.c:5040 [inline]
__ia32_sys_rename+0x80/0xa0 fs/namei.c:5040
do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:230
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255
entry_SYSENTER_compat_after_hwframe+0x70/0x7a

-> #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+0x515/0x6a0 fs/ntfs3/frecord.c:106
evict+0x2ed/0x6b0 fs/inode.c:664
iput_final fs/inode.c:1775 [inline]
iput.part.0+0x560/0x7b0 fs/inode.c:1801
iput+0x5c/0x80 fs/inode.c:1791
dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
__dentry_kill+0x3b8/0x640 fs/dcache.c:607
shrink_dentry_list+0x11e/0x4a0 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x327/0x540 fs/super.c:228
do_shrink_slab+0x428/0x1120 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa83/0x1310 mm/shrinker.c:626
shrink_one+0x4f7/0x700 mm/vmscan.c:4724
shrink_many mm/vmscan.c:4776 [inline]
lru_gen_shrink_node mm/vmscan.c:4893 [inline]
shrink_node+0x20cd/0x3790 mm/vmscan.c:5833
kswapd_shrink_node mm/vmscan.c:6638 [inline]
balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6828
kswapd+0x5be/0xbf0 mm/vmscan.c:7088
kthread+0x2c6/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

-> #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:3868 [inline]
__lock_acquire+0x2464/0x3b10 kernel/locking/lockdep.c:5136
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5718
__fs_reclaim_acquire mm/page_alloc.c:3693 [inline]
fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook mm/slab.h:710 [inline]
slab_alloc_node mm/slub.c:3460 [inline]
__kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0x4c/0x90 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
kvmalloc_node+0x99/0x1a0 mm/util.c:617
kvmalloc include/linux/slab.h:738 [inline]
run_add_entry+0x7b2/0xbe0 fs/ntfs3/run.c:389
attr_allocate_clusters+0x213/0x710 fs/ntfs3/attrib.c:181
attr_set_size+0x14d7/0x2ca0 fs/ntfs3/attrib.c:572
ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:840
ntfs_extend+0x3fd/0x560 fs/ntfs3/file.c:333
ntfs_file_write_iter+0x33f/0x1e60 fs/ntfs3/file.c:1077
call_write_iter include/linux/fs.h:2020 [inline]
do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735
do_iter_write+0x17f/0x7f0 fs/read_write.c:860
vfs_writev+0x221/0x700 fs/read_write.c:933
do_writev+0x137/0x370 fs/read_write.c:976
do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:230
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255
entry_SYSENTER_compat_after_hwframe+0x70/0x7a

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.1/29095:
#0: ffff888024ffd4c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe7/0x170 fs/file.c:1177
#1: ffff888015250418 (sb_writers#17){.+.+}-{0:0}, at: do_writev+0x137/0x370 fs/read_write.c:976
#2: ffff8880241bf240 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:822 [inline]
#2: ffff8880241bf240 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: ntfs_file_write_iter+0x23b/0x1e60 fs/ntfs3/file.c:1061
#3: ffff8880241befa0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1124 [inline]
#3: ffff8880241befa0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_set_size+0x111/0x220 fs/ntfs3/inode.c:837
#4: ffff8880241bf050 (&ni->file.run_lock#2){++++}-{3:3}, at: ntfs_set_size+0x119/0x220 fs/ntfs3/inode.c:838

stack backtrace:
CPU: 2 PID: 29095 Comm: syz-executor.1 Not tainted 6.7.0-rc1-syzkaller-00213-g791c8ab095f7 #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+0xd9/0x1b0 lib/dump_stack.c:106
check_noncircular+0x317/0x400 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:3868 [inline]
__lock_acquire+0x2464/0x3b10 kernel/locking/lockdep.c:5136
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5718
__fs_reclaim_acquire mm/page_alloc.c:3693 [inline]
fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707
might_alloc include/linux/sched/mm.h:303 [inline]
slab_pre_alloc_hook mm/slab.h:710 [inline]
slab_alloc_node mm/slub.c:3460 [inline]
__kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0x4c/0x90 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
kvmalloc_node+0x99/0x1a0 mm/util.c:617
kvmalloc include/linux/slab.h:738 [inline]
run_add_entry+0x7b2/0xbe0 fs/ntfs3/run.c:389
attr_allocate_clusters+0x213/0x710 fs/ntfs3/attrib.c:181
attr_set_size+0x14d7/0x2ca0 fs/ntfs3/attrib.c:572
ntfs_set_size+0x13d/0x220 fs/ntfs3/inode.c:840
ntfs_extend+0x3fd/0x560 fs/ntfs3/file.c:333
ntfs_file_write_iter+0x33f/0x1e60 fs/ntfs3/file.c:1077
call_write_iter include/linux/fs.h:2020 [inline]
do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735
do_iter_write+0x17f/0x7f0 fs/read_write.c:860
vfs_writev+0x221/0x700 fs/read_write.c:933
do_writev+0x137/0x370 fs/read_write.c:976
do_syscall_32_irqs_on arch/x86/entry/common.c:164 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:230
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:255
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
RIP: 0023:0xf7f1e579
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:00000000f7f195ac EFLAGS: 00000292 ORIG_RAX: 0000000000000092
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000000
RDX: 0000000000000001 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

---
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Next message: Ywe Cærlyn: "LeX, the ultimate derivative of Open Source (was fair pay, Lab X, low jitter)"
Previous message: Chris Li: "Re: [PATCH 22/24] swap: make swap_cluster_readahead static"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]