WARNING in ovl_d_real (2)

Status: upstream: reported on 2026/10/16 21:16
Reported-by: syzbot+8c2f9badc3fd9ea00188@syzkaller.appspotmail.com
First crash: 1d21h, last: 1d21h
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in ovl_d_real (2) -1 11 723d 908d 0/3 auto-obsoleted due to no activity on 2025/02/02 03:25
upstream WARNING in ovl_d_real overlayfs -1 1 2306d 2304d 0/29 auto-closed as invalid on 2020/10/23 17:22
linux-6.1 WARNING in ovl_d_real -1 5 864d 898d 0/3 auto-obsoleted due to no activity on 2024/09/14 07:09
linux-5.15 WARNING in ovl_d_real (4) -1 4 30d 117d 0/3 upstream: reported on 2026/06/23 15:08
linux-5.15 WARNING in ovl_d_real -1 1 1097d 1097d 0/3 auto-obsoleted due to no activity on 2024/01/24 23:41
linux-5.15 WARNING in ovl_d_real (3) -1 3 559d 591d 0/3 auto-obsoleted due to no activity on 2025/07/15 18:59

Sample crash report:
------------[ cut here ]------------
ovl_d_real(/file2, NULL:0): real dentry (ffff88805328b318/262) not found
WARNING: CPU: 0 PID: 6686 at fs/overlayfs/super.c:116 ovl_d_real+0x212/0x490 fs/overlayfs/super.c:113
Modules linked in:
CPU: 0 PID: 6686 Comm: syz.4.440 Tainted: G S                 syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:ovl_d_real+0x212/0x490 fs/overlayfs/super.c:113
Code: 36 45 31 ff 31 c0 48 c7 c7 c0 27 c4 8a 48 c7 c6 c6 60 59 8c 48 89 da 4c 89 e1 4d 89 f0 4d 89 f9 50 e8 62 19 6b fe 48 83 c4 08 <0f> 0b 48 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 09 a6 9f fe 49
RSP: 0018:ffffc90004b3f5c8 EFLAGS: 00010282
RAX: ce22807b504fdb00 RBX: ffff88805328aa48 RCX: 0000000000080000
RDX: ffffc90019821000 RSI: 000000000000a552 RDI: 000000000000a553
RBP: dffffc0000000000 R08: ffffc90004b3f247 R09: 1ffff92000967e48
R10: dffffc0000000000 R11: fffff52000967e49 R12: ffffffff8ac42820
R13: ffff88807f640e20 R14: 0000000000000000 R15: ffff88805328b318
FS:  00007f4871cbf6c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4870debc40 CR3: 0000000054558000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 d_real include/linux/dcache.h:577 [inline]
 d_real_inode include/linux/dcache.h:592 [inline]
 process_measurement+0x18dc/0x1c40 security/integrity/ima/ima_main.c:283
 ima_file_check+0xc8/0x110 security/integrity/ima/ima_main.c:534
 do_open fs/namei.c:3679 [inline]
 path_openat+0x272b/0x2f10 fs/namei.c:3834
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4870d9e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4871cbf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4871026090 RCX: 00007f4870d9e559
RDX: 0000000000000000 RSI: 00002000000006c0 RDI: ffffffffffffff9c
RBP: 00007f4870e358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4871026128 R14: 00007f4871026090 R15: 00007ffe8486daa8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/16 21:15 linux-6.1.y 79807e970724 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in ovl_d_real
* Struck through repros no longer work on HEAD.