[syzbot] [ntfs3?] possible deadlock in ntfs_file_release

syzbot
2024-05-21T23:42:33Z

Hello,

syzbot found the following issue on:

HEAD commit: ff2632d7d08e Merge tag 'powerpc-6.10-1' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16839adc980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f1cd4092753f97c5
dashboard link: https://syzkaller.appspot.com/bug?extid=b14d0f52a28b512d7b94
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bfc388454a52/disk-ff2632d7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da1638631dd4/vmlinux-ff2632d7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6249354c3233/bzImage-ff2632d7.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b14d0f52a28b512d7b94@syzkaller.appspotmail.com

======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller-08410-gff2632d7d08e #0 Not tainted
------------------------------------------------------
syz-executor.2/24188 is trying to acquire lock:
ffff88805b815a30 (&ni->file.run_lock#3){++++}-{3:3}, at: ntfs_file_release+0x184/0x220 fs/ntfs3/file.c:1179

but task is already holding lock:
ffff88805b815980 (&ni->ni_lock#2/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
ffff88805b815980 (&ni->ni_lock#2/4){+.+.}-{3:3}, at: ntfs_file_release+0x175/0x220 fs/ntfs3/file.c:1178

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #3 (&ni->ni_lock#2/4){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
ntfs_fallocate+0x9af/0x1120 fs/ntfs3/file.c:556
vfs_fallocate+0x4b8/0xf70 fs/open.c:330
ksys_fallocate fs/open.c:353 [inline]
__do_sys_fallocate fs/open.c:361 [inline]
__se_sys_fallocate fs/open.c:359 [inline]
__x64_sys_fallocate+0xd5/0x140 fs/open.c:359
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (mapping.invalidate_lock#9){++++}-{3:3}:
down_read+0x9a/0x330 kernel/locking/rwsem.c:1526
filemap_invalidate_lock_shared include/linux/fs.h:846 [inline]
filemap_fault+0x275/0x2630 mm/filemap.c:3277
__do_fault+0x10a/0x490 mm/memory.c:4526
do_shared_fault mm/memory.c:4949 [inline]
do_fault mm/memory.c:5023 [inline]
do_pte_missing mm/memory.c:3875 [inline]
handle_pte_fault mm/memory.c:5295 [inline]
__handle_mm_fault+0x3148/0x4a80 mm/memory.c:5436
handle_mm_fault+0x476/0xa00 mm/memory.c:5601
do_user_addr_fault+0x2e5/0x1010 arch/x86/mm/fault.c:1383
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1533
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
filldir+0x28c/0x5e0 fs/readdir.c:293
dir_emit_dot include/linux/fs.h:3592 [inline]
dir_emit_dots include/linux/fs.h:3603 [inline]
ntfs_readdir+0x851/0x1090 fs/ntfs3/dir.c:414
iterate_dir+0x292/0x9e0 fs/readdir.c:110
__do_sys_getdents fs/readdir.c:326 [inline]
__se_sys_getdents fs/readdir.c:311 [inline]
__x64_sys_getdents+0x14f/0x2d0 fs/readdir.c:311
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&mm->mmap_lock){++++}-{3:3}:
__might_fault mm/memory.c:6215 [inline]
__might_fault+0x11b/0x190 mm/memory.c:6208
_copy_to_user+0x2b/0xc0 lib/usercopy.c:36
copy_to_user include/linux/uaccess.h:191 [inline]
fiemap_fill_next_extent+0x232/0x390 fs/ioctl.c:145
ni_fiemap+0x444/0xc10 fs/ntfs3/frecord.c:2065
ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1206
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x404/0x1ad0 fs/ioctl.c:838
__do_sys_ioctl fs/ioctl.c:902 [inline]
__se_sys_ioctl fs/ioctl.c:890 [inline]
__x64_sys_ioctl+0x116/0x220 fs/ioctl.c:890
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->file.run_lock#3){++++}-{3:3}:
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
down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
ntfs_file_release+0x184/0x220 fs/ntfs3/file.c:1179
__fput+0x270/0xb80 fs/file_table.c:422
task_work_run+0x14e/0x250 kernel/task_work.c:180
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xa7d/0x2c10 kernel/exit.c:878
do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:

&ni->file.run_lock#3 --> mapping.invalidate_lock#9 --> &ni->ni_lock#2
/4

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&ni->ni_lock
#2/4);
lock(mapping.invalidate_lock#9);
lock(&ni->ni_lock#2/4);
lock(&ni->file.run_lock#3);

*** DEADLOCK ***

1 lock held by syz-executor.2/24188:
#0: ffff88805b815980 (&ni->ni_lock#2/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
#0: ffff88805b815980 (&ni->ni_lock#2/4){+.+.}-{3:3}, at: ntfs_file_release+0x175/0x220 fs/ntfs3/file.c:1178

stack backtrace:
CPU: 1 PID: 24188 Comm: syz-executor.2 Not tainted 6.9.0-syzkaller-08410-gff2632d7d08e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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
down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
ntfs_file_release+0x184/0x220 fs/ntfs3/file.c:1179
__fput+0x270/0xb80 fs/file_table.c:422
task_work_run+0x14e/0x250 kernel/task_work.c:180
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xa7d/0x2c10 kernel/exit.c:878
do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
__do_sys_exit_group kernel/exit.c:1038 [inline]
__se_sys_exit_group kernel/exit.c:1036 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb36fa7cee9
Code: Unable to access opcode bytes at 0x7fb36fa7cebf.
RSP: 002b:00007ffe2fc5daf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fb36fa7cee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 00007fb36fa00000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
</TASK>

---
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