syzbot


possible deadlock in ntfs_file_release

Status: upstream: reported on 2024/05/21 23:42
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+b14d0f52a28b512d7b94@syzkaller.appspotmail.com
First crash: 31d, last: 23d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs3?] possible deadlock in ntfs_file_release 0 (1) 2024/05/21 23:42

Sample crash report:
======================================================
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>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/17 23:34 upstream ff2632d7d08e a12e99e7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in ntfs_file_release
2024/05/25 23:45 upstream 54f71b0369c9 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in ntfs_file_release
2024/05/24 19:54 upstream 02c438bbfffe c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in ntfs_file_release
* Struck through repros no longer work on HEAD.