general protection fault in configfs_depend_item_unlocked

Status: moderation: reported on 2026/07/28 13:42
Subsystems: fs
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+d0e98cbb85bec373bb33@syzkaller.appspotmail.com
First crash: 16d, last: 10h31m
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
f20c5159 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ general protection fault in configfs_depend_item_unlocked 2026/07/26 02:20 2026/07/26 02:20 2026/07/26 02:48 492bab15

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 0 UID: 0 PID: 12253 Comm: syz.9.1441 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:configfs_depend_item_unlocked+0x24a/0x6a0 fs/configfs/dir.c:1246
Code: 05 fc 08 c7 44 24 1c fe ff ff ff e9 a6 02 00 00 e8 9b 0f 4a ff 48 8d 7d 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1d 04 00 00 48 bb 00 00 00 00 00 fc ff df 4c 8b
RSP: 0018:ffffc90005fdfb28 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90015290000
RDX: 000000000000000c RSI: ffffffff82c042c5 RDI: 0000000000000060
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880525cbc00 R14: ffff8880525cbc00 R15: ffff8880525cbcb8
FS:  00007f90842456c0(0000) GS:ffff888123dec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa9279556c8 CR3: 0000000075ea3000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 usbg_make_tpg+0x261/0x620 drivers/usb/gadget/function/f_tcm.c:1686
 target_fabric_make_tpg+0xab/0x8c0 drivers/target/target_core_fabric_configfs.c:939
 configfs_mkdir+0x51e/0xb70 fs/configfs/dir.c:1360
 vfs_mkdir+0x361/0x850 fs/namei.c:5276
 filename_mkdirat+0x48b/0x5e0 fs/namei.c:5309
 __do_sys_mkdir fs/namei.c:5336 [inline]
 __se_sys_mkdir fs/namei.c:5333 [inline]
 __x64_sys_mkdir+0x6b/0x90 fs/namei.c:5333
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f908339e0d9
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:00007f9084245028 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f9083626090 RCX: 00007f908339e0d9
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000200000000600
RBP: 00007f9083435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9083626128 R14: 00007f9083626090 R15: 00007ffd26413a98
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:configfs_depend_item_unlocked+0x24a/0x6a0 fs/configfs/dir.c:1246
Code: 05 fc 08 c7 44 24 1c fe ff ff ff e9 a6 02 00 00 e8 9b 0f 4a ff 48 8d 7d 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1d 04 00 00 48 bb 00 00 00 00 00 fc ff df 4c 8b
RSP: 0018:ffffc90005fdfb28 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90015290000
RDX: 000000000000000c RSI: ffffffff82c042c5 RDI: 0000000000000060
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880525cbc00 R14: ffff8880525cbc00 R15: ffff8880525cbcb8
FS:  00007f90842456c0(0000) GS:ffff888123dec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa926beb7c0 CR3: 0000000075ea3000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	c7 44 24 1c fe ff ff 	movl   $0xfffffffe,0x1c(%rsp)
   7:	ff
   8:	e9 a6 02 00 00       	jmp    0x2b3
   d:	e8 9b 0f 4a ff       	call   0xff4a0fad
  12:	48 8d 7d 60          	lea    0x60(%rbp),%rdi
  16:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1d:	fc ff df
  20:	48 89 fa             	mov    %rdi,%rdx
  23:	48 c1 ea 03          	shr    $0x3,%rdx
* 27:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2b:	0f 85 1d 04 00 00    	jne    0x44e
  31:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
  38:	fc ff df
  3b:	4c                   	rex.WR
  3c:	8b                   	.byte 0x8b

Crashes (37):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/09 10:39 upstream 06cf61899d64 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in configfs_depend_item_unlocked
2026/08/05 05:35 upstream c21bb4193868 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in configfs_depend_item_unlocked
2026/08/04 01:55 upstream 848acc8ffe1b 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in configfs_depend_item_unlocked
2026/08/01 06:41 upstream 0131b508c0e2 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/08/01 06:21 upstream 0131b508c0e2 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/31 10:31 upstream 3708dd948844 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in configfs_depend_item_unlocked
2026/07/30 21:15 upstream 11028ab62899 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in configfs_depend_item_unlocked
2026/07/30 12:59 upstream 11028ab62899 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in configfs_depend_item_unlocked
2026/07/30 03:13 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in configfs_depend_item_unlocked
2026/07/29 16:05 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/29 14:53 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/29 04:31 upstream 3b5f4b83c4ab 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in configfs_depend_item_unlocked
2026/07/29 02:43 upstream 3b5f4b83c4ab 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in configfs_depend_item_unlocked
2026/07/28 23:29 upstream 62cc90241548 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in configfs_depend_item_unlocked
2026/07/28 23:02 upstream 3b5f4b83c4ab 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/28 20:24 upstream 62cc90241548 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/27 03:41 upstream 4235cb24ec1e 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root general protection fault in configfs_depend_item_unlocked
2026/07/27 02:18 upstream 4235cb24ec1e 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in configfs_depend_item_unlocked
2026/07/24 23:13 upstream 48a5a7ab8d6a 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in configfs_depend_item_unlocked
2026/07/24 23:05 upstream 48a5a7ab8d6a 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in configfs_depend_item_unlocked
2026/07/24 22:27 upstream 48a5a7ab8d6a 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/24 22:24 upstream 48a5a7ab8d6a 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/07/24 20:39 upstream 48a5a7ab8d6a dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in configfs_depend_item_unlocked
2026/07/24 15:36 upstream 48a5a7ab8d6a dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in configfs_depend_item_unlocked
2026/07/24 13:36 upstream d326f83e819c 544adce9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/08/07 00:49 upstream fcaeecb8b0cd c38879ea .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/08/05 08:37 upstream 562bfb501c54 52aa2820 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/08/03 00:14 upstream bd1dde877520 e611ffe1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/08/01 15:09 upstream 02dc699f83d0 e611ffe1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/08/01 05:41 upstream a2cf4ef33184 e611ffe1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/07/27 13:28 upstream f5098b6bae76 4a865b71 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream general protection fault in configfs_depend_item_unlocked
2026/07/25 21:18 upstream 0ce37745d4bf 492bab15 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/07/25 13:25 upstream e2a936998ab2 492bab15 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in configfs_depend_item_unlocked
2026/07/30 12:40 upstream 11028ab62899 abc81b93 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in configfs_depend_item_unlocked
2026/07/24 21:17 upstream 48a5a7ab8d6a 4a865b71 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in configfs_depend_item_unlocked
2026/08/07 02:44 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in configfs_depend_item_unlocked
2026/08/06 23:16 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in configfs_depend_item_unlocked
* Struck through repros no longer work on HEAD.