general protection fault in cgroup_mkdir

Status: premoderation: reported C repro on 2025/11/13 11:15
Reported-by: syzbot+8df1af6d81110ac60948@syzkaller.appspotmail.com
First crash: 327d, last: 3h25m
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2026/07/22 android16-6.12 (ToT) 6599be6df4d0 C Failed due to an error; will retry later
2025/11/14 lts (merge base) 2b2cbdcede38 C Didn't crash
2025/12/03 upstream (ToT) 3f9f0252130e C Didn't crash
▶ ▼ Last patch testing requests (6)
Created Duration User Patch Repo Result
2026/08/01 07:17 36m retest repro android16-6.12 report log
2026/08/01 07:17 26m retest repro android16-6.12 report log
2026/08/01 07:17 47m retest repro android16-6.12 report log
2026/04/17 20:03 9m retest repro android16-6.12 report log
2026/04/17 20:03 1h06m retest repro android16-6.12 report log
2026/04/17 20:03 48m retest repro android16-6.12 report log

Sample crash report:
RBP: 00007ffdd1a89780 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f2508215fac R14: 00007f2508215fa0 R15: 00007f2508215fa0
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 1 UID: 0 PID: 374 Comm: syz.2.20 Not tainted syzkaller #0 4cdc09a83674403ae09eb79c4caea2b8730b48e4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:cgroup_mkdir+0x117f/0x1570 kernel/cgroup/cgroup.c:5940
Code: eb 05 e8 34 4e 08 00 4c 89 ef e8 0c 9e 00 00 49 81 fd 01 f0 ff ff 0f 83 b3 fb ff ff 4d 8d b5 08 01 00 00 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 d2 7a 60 00 49 8b bd 08 01 00 00
RSP: 0018:ffffc9000103fc88 EFLAGS: 00010206
RAX: ac696d47635aa800 RBX: 0000000000000021 RCX: ffff8881f6f3ae40
RDX: ffff88810cf38080 RSI: ffff88811604c000 RDI: ffff888100042000
RBP: ffffc9000103fd30 R08: ffffffff81db93c8 R09: ffffffff81dfa22f
R10: ffffffff81dfce3a R11: ffffffff81df9d4e R12: ffff8881281135b0
R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000
FS:  0000555592cdd500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000115f4c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 kernfs_iop_mkdir+0x1c2/0x2d0 fs/kernfs/dir.c:1246
 vfs_mkdir+0x582/0x820 fs/namei.c:4265
 do_mkdirat+0x240/0x530 fs/namei.c:4288
 __do_sys_mkdirat fs/namei.c:4303 [inline]
 __se_sys_mkdirat fs/namei.c:4301 [inline]
 __x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4301
 x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f2507f9c799
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:00007ffdd1a89718 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f2508215fa0 RCX: 00007f2507f9c799
RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007ffdd1a89780 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f2508215fac R14: 00007f2508215fa0 R15: 00007f2508215fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:cgroup_mkdir+0x117f/0x1570 kernel/cgroup/cgroup.c:5940
Code: eb 05 e8 34 4e 08 00 4c 89 ef e8 0c 9e 00 00 49 81 fd 01 f0 ff ff 0f 83 b3 fb ff ff 4d 8d b5 08 01 00 00 4c 89 f3 48 c1 eb 03 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 d2 7a 60 00 49 8b bd 08 01 00 00
RSP: 0018:ffffc9000103fc88 EFLAGS: 00010206
RAX: ac696d47635aa800 RBX: 0000000000000021 RCX: ffff8881f6f3ae40
RDX: ffff88810cf38080 RSI: ffff88811604c000 RDI: ffff888100042000
RBP: ffffc9000103fd30 R08: ffffffff81db93c8 R09: ffffffff81dfa22f
R10: ffffffff81dfce3a R11: ffffffff81df9d4e R12: ffff8881281135b0
R13: 0000000000000000 R14: 0000000000000108 R15: dffffc0000000000
FS:  0000555592cdd500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000115f4c000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	eb 05                	jmp    0x7
   2:	e8 34 4e 08 00       	call   0x84e3b
   7:	4c 89 ef             	mov    %r13,%rdi
   a:	e8 0c 9e 00 00       	call   0x9e1b
   f:	49 81 fd 01 f0 ff ff 	cmp    $0xfffffffffffff001,%r13
  16:	0f 83 b3 fb ff ff    	jae    0xfffffbcf
  1c:	4d 8d b5 08 01 00 00 	lea    0x108(%r13),%r14
  23:	4c 89 f3             	mov    %r14,%rbx
  26:	48 c1 eb 03          	shr    $0x3,%rbx
* 2a:	42 80 3c 3b 00       	cmpb   $0x0,(%rbx,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 d2 7a 60 00       	call   0x607b0b
  39:	49 8b bd 08 01 00 00 	mov    0x108(%r13),%rdi

Crashes (102):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/22 11:46 android16-6.12 e266923bd499 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2025/11/13 13:02 android16-6.12 0d6730ee6542 07e030de .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2025/11/13 12:27 android16-6.12 0d6730ee6542 07e030de .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2025/11/13 11:49 android16-6.12 0d6730ee6542 07e030de .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/09 03:27 android16-6.12 136b3cf43ec1 243b72f1 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/07 05:54 android16-6.12 85581c945c56 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/06 20:27 android16-6.12 02e193b62eb3 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/06 16:57 android16-6.12 02e193b62eb3 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/06 10:44 android16-6.12 31493cc8d965 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/06 08:57 android16-6.12 31493cc8d965 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/06 00:31 android16-6.12 31493cc8d965 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/05 21:28 android16-6.12 31493cc8d965 af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/05 19:52 android16-6.12 3a7d1771d492 af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/05 18:51 android16-6.12 3a7d1771d492 af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/05 09:26 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/05 00:17 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/04 19:26 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/04 15:16 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/04 01:05 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/03 23:16 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/03 18:53 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/03 11:34 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/03 01:22 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/02 22:23 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/02 21:34 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/02 18:00 android16-6.12 3a7d1771d492 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/02 14:54 android16-6.12 3a7d1771d492 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/02 08:43 android16-6.12 3a7d1771d492 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/02 04:55 android16-6.12 3a7d1771d492 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/01 18:58 android16-6.12 f82d63769e69 f5cdae2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/01 10:14 android16-6.12 f82d63769e69 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/01 05:53 android16-6.12 dfd0de11e80f 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/10/01 00:12 android16-6.12 dfd0de11e80f 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/30 20:46 android16-6.12 dfd0de11e80f 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/29 22:38 android16-6.12 c95e515a6be2 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/29 10:04 android16-6.12 da245f6c05a1 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/28 21:19 android16-6.12 da245f6c05a1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/28 17:41 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/28 10:24 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/26 16:08 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/26 12:54 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/26 02:04 android16-6.12 09f588c04484 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/25 20:35 android16-6.12 09f588c04484 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/25 01:50 android16-6.12 558b94a8d268 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/24 23:10 android16-6.12 558b94a8d268 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/24 09:28 android16-6.12 a24919af1c4d 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/23 23:38 android16-6.12 a24919af1c4d abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/21 15:05 android16-6.12 3b5131b275d2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
2026/09/21 04:24 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in cgroup_mkdir
* Struck through repros no longer work on HEAD.