syzbot


possible deadlock in attr_data_get_block (2)

Status: upstream: reported C repro on 2024/08/15 10:46
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+262a71e9d2faf8747085@syzkaller.appspotmail.com
First crash: 372d, last: 1d01h
Cause bisection: failed (error log, bisect log)
  
Discussions (9)
Title Replies (including bot) Last reply
[syzbot] Monthly ntfs3 report (May 2025) 0 (1) 2025/05/24 10:04
[syzbot] Monthly ntfs3 report (Apr 2025) 0 (1) 2025/04/22 12:41
[syzbot] Monthly ntfs3 report (Mar 2025) 0 (1) 2025/03/18 14:49
[syzbot] Monthly ntfs3 report (Feb 2025) 0 (1) 2025/02/16 21:53
[syzbot] Monthly ntfs3 report (Jan 2025) 0 (1) 2025/01/15 08:54
[syzbot] Monthly ntfs3 report (Dec 2024) 0 (1) 2024/12/16 09:44
[syzbot] Monthly ntfs3 report (Nov 2024) 0 (1) 2024/11/13 11:07
[syzbot] Monthly ntfs3 report (Sep 2024) 0 (1) 2024/09/12 08:11
[syzbot] [ntfs3?] possible deadlock in attr_data_get_block (2) 0 (1) 2024/08/15 10:46
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 possible deadlock in attr_data_get_block origin:lts-only 4 C inconclusive 375 1d06h 876d 0/3 upstream: reported C repro on 2023/03/29 04:32
linux-6.6 possible deadlock in attr_data_get_block 4 18 1d03h 54d 0/2 upstream: reported on 2025/06/27 20:24
upstream possible deadlock in attr_data_get_block ntfs3 4 C error 3111 372d 1039d 27/29 fixed on 2024/08/14 03:44
linux-5.15 possible deadlock in attr_data_get_block origin:lts-only 4 C done 361 8d11h 877d 0/3 upstream: reported C repro on 2023/03/27 15:11

Sample crash report:
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor213/5832 is trying to acquire lock:
ffff888076492d10 (&ni->ni_lock/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
ffff888076492d10 (&ni->ni_lock/5){+.+.}-{4:4}, at: attr_data_get_block+0x464/0x2fb0 fs/ntfs3/attrib.c:918

but task is already holding lock:
ffff88807f554620 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:152 [inline]
ffff88807f554620 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x182/0x430 mm/util.c:573

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       __might_fault+0xc6/0x120 mm/memory.c:6851
       _inline_copy_to_user include/linux/uaccess.h:192 [inline]
       _copy_to_user+0x2c/0xb0 lib/usercopy.c:26
       copy_to_user include/linux/uaccess.h:225 [inline]
       fiemap_fill_next_extent+0x235/0x420 fs/ioctl.c:145
       ni_fiemap+0xfec/0x1270 fs/ntfs3/frecord.c:1953
       ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1360
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x1981/0x2770 fs/ioctl.c:840
       __do_sys_ioctl fs/ioctl.c:904 [inline]
       __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ni->ni_lock/5){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3163 [inline]
       check_prevs_add kernel/locking/lockdep.c:3282 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
       ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
       attr_data_get_block+0x464/0x2fb0 fs/ntfs3/attrib.c:918
       ntfs_file_mmap+0x4f2/0x850 fs/ntfs3/file.c:371
       call_mmap include/linux/fs.h:2245 [inline]
       mmap_file mm/internal.h:124 [inline]
       __mmap_new_file_vma mm/vma.c:2292 [inline]
       __mmap_new_vma mm/vma.c:2356 [inline]
       __mmap_region mm/vma.c:2457 [inline]
       mmap_region+0x247c/0x2fa0 mm/vma.c:2535
       do_mmap+0xecc/0x13a0 mm/mmap.c:561
       vm_mmap_pgoff+0x214/0x430 mm/util.c:575
       ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&mm->mmap_lock);
                               lock(&ni->ni_lock/5);
                               lock(&mm->mmap_lock);
  lock(&ni->ni_lock/5);

 *** DEADLOCK ***

1 lock held by syz-executor213/5832:
 #0: ffff88807f554620 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:152 [inline]
 #0: ffff88807f554620 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x182/0x430 mm/util.c:573

stack backtrace:
CPU: 0 UID: 0 PID: 5832 Comm: syz-executor213 Not tainted 6.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
 check_prev_add kernel/locking/lockdep.c:3163 [inline]
 check_prevs_add kernel/locking/lockdep.c:3282 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
 ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline]
 attr_data_get_block+0x464/0x2fb0 fs/ntfs3/attrib.c:918
 ntfs_file_mmap+0x4f2/0x850 fs/ntfs3/file.c:371
 call_mmap include/linux/fs.h:2245 [inline]
 mmap_file mm/internal.h:124 [inline]
 __mmap_new_file_vma mm/vma.c:2292 [inline]
 __mmap_new_vma mm/vma.c:2356 [inline]
 __mmap_region mm/vma.c:2457 [inline]
 mmap_region+0x247c/0x2fa0 mm/vma.c:2535
 do_mmap+0xecc/0x13a0 mm/mmap.c:561
 vm_mmap_pgoff+0x214/0x430 mm/util.c:575
 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e34788c49
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcc0c215c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009

Crashes (2623):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/24 08:11 upstream d082ecbc71e9 d34966d1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs possible deadlock in attr_data_get_block
2024/09/13 10:33 upstream fdf042df0463 73e8a465 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs possible deadlock in attr_data_get_block
2024/08/28 04:07 upstream 3ec3f5fc4a91 6c853ff9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs possible deadlock in attr_data_get_block
2024/08/15 01:11 upstream 9d5906799f7d e6b88e20 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs possible deadlock in attr_data_get_block
2024/08/28 02:49 upstream 3ec3f5fc4a91 6c853ff9 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/08/15 14:38 upstream d7ee5bdce789 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/15 03:16 upstream 24ea63ea3877 dcc075fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root possible deadlock in attr_data_get_block
2025/08/14 13:59 upstream 0cc53520e68b dcc075fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/14 07:50 upstream 0cc53520e68b 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/13 02:23 upstream 8742b2d8935f 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/12 12:10 upstream 53e760d89498 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/12 10:23 upstream 53e760d89498 c06e8995 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root possible deadlock in attr_data_get_block
2025/08/10 11:02 upstream 2b38afce25c4 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/10 06:04 upstream 561c80369df0 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root possible deadlock in attr_data_get_block
2025/08/09 10:23 upstream 0227b49b5027 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/09 02:21 upstream 37816488247d 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/09 02:20 upstream 37816488247d 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/06 05:15 upstream 6bcdbd62bd56 ffe1dd46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/08/04 21:30 upstream d632ab86aff2 f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/08/02 16:31 upstream a6923c06a3b2 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/08/02 13:32 upstream 0905809b38bd 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/08/02 05:24 upstream 0905809b38bd 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/08/01 18:19 upstream f2d282e1dfb3 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs possible deadlock in attr_data_get_block
2025/07/31 14:34 upstream 260f6f4fda93 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/07/31 02:46 upstream e8d780dcd957 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/05 18:26 upstream 7e161a991ea7 37880f40 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root possible deadlock in attr_data_get_block
2025/08/13 21:12 linux-next 2674d1eadaa2 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/11 10:30 linux-next b1549501188c 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/10 09:24 linux-next b1549501188c 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/08 12:53 linux-next b1549501188c 987b750d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/08 00:37 linux-next 442d93313cae 6a893178 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/07 12:09 linux-next 442d93313cae 04cffc22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/05 07:41 linux-next afec768a6a8f abdcb213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/05 05:58 linux-next afec768a6a8f abdcb213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/04 19:19 linux-next 5c5a10f0be96 abdcb213 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/03 20:20 linux-next 84b92a499e7e 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/01 14:59 linux-next 84b92a499e7e 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/01 13:01 linux-next 84b92a499e7e 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/01 10:40 linux-next 84b92a499e7e 0c075d67 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in attr_data_get_block
2025/08/20 09:43 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/20 02:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/19 18:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/19 15:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 523f460e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/17 03:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/16 07:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/15 23:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/13 18:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/13 06:31 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f5ae30d69d7 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/09 12:01 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/09 03:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/06 09:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 904e669c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/03 20:45 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/03 14:15 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
2025/08/03 05:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 82af5ea7c611 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in attr_data_get_block
* Struck through repros no longer work on HEAD.