[syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    2213e57a69f0 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12a822e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=714d45b6135c308e
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1341fce2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=144ddd34580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bf4625d47a8f/disk-2213e57a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/270abffcbf3c/vmlinux-2213e57a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1f0f6eb3e385/Image-2213e57a.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2f5997142143/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=135f62e2580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6642 at fs/inode.c:417 drop_nlink+0xe4/0x138 fs/inode.c:417
Modules linked in:
CPU: 0 UID: 0 PID: 6642 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : drop_nlink+0xe4/0x138 fs/inode.c:417
lr : drop_nlink+0xe4/0x138 fs/inode.c:417
sp : ffff8000a54b79a0
x29: ffff8000a54b79a0 x28: dfff800000000000 x27: ffff0000efc5d000
x26: dfff800000000000 x25: 0000000200000000 x24: 0000000000000000
x23: 1fffe0001d284485 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000e9422428 x19: ffff0000e94223e0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000805379bc x15: 0000000000000001
x14: 1fffe0001bd69171 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60001bd69172 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000cdeb8000 x7 : ffff8000826e1b78 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800080537ac4
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 drop_nlink+0xe4/0x138 fs/inode.c:417 (P)
 f2fs_i_links_write fs/f2fs/f2fs.h:3233 [inline]
 f2fs_drop_nlink+0x104/0x2e8 fs/f2fs/dir.c:849
 f2fs_delete_entry+0x740/0x9a8 fs/f2fs/dir.c:911
 f2fs_unlink+0x344/0xa3c fs/f2fs/namei.c:590
 f2fs_rmdir+0x5c/0x7c fs/f2fs/namei.c:755
 vfs_rmdir+0x328/0x464 fs/namei.c:4461
 do_rmdir+0x214/0x4c4 fs/namei.c:4516
 __do_sys_unlinkat fs/namei.c:4690 [inline]
 __se_sys_unlinkat fs/namei.c:4684 [inline]
 __arm64_sys_unlinkat+0xc8/0xf8 fs/namei.c:4684
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 143176
hardirqs last  enabled at (143175): [<ffff8000806302f8>] seqcount_lockdep_reader_access+0x80/0x104 include/linux/seqlock.h:74
hardirqs last disabled at (143176): [<ffff80008b01a2c4>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434
softirqs last  enabled at (142090): [<ffff800080201608>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (142088): [<ffff8000802015d4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com
Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

Tested on:

commit:         2213e57a Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1625e942580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=714d45b6135c308e
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10082092580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com
Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

Tested on:

commit:         2213e57a Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=10fffd04580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=714d45b6135c308e
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14c51214580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com
Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

Tested on:

commit:         bf45a62b Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12058c58580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=714d45b6135c308e
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14598c58580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com
Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

Tested on:

commit:         b98c94ee arm64: mte: Do not warn if the page is alread..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1219ef34580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d60b6f0d339ca06f
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=106bd614580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com
Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

Tested on:

commit:         dcb6fa37 Linux 6.18-rc3
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=16a2c114580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5eeb63aaf73b06da
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14ca3704580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [f2fs?] WARNING in f2fs_delete_entry (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com
Tested-by: syzbot+c07d47c7bc68f47b9083@syzkaller.appspotmail.com

Tested on:

commit:         dcb6fa37 Linux 6.18-rc3
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=162a9bcd980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5eeb63aaf73b06da
dashboard link: https://syzkaller.appspot.com/bug?extid=c07d47c7bc68f47b9083
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
patch:          https://syzkaller.appspot.com/x/patch.diff?x=133da17c580000

Note: testing is done by a robot and is best-effort only.