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general protection fault in filename_create

Status: upstream: reported C repro on 2023/08/05 10:34
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+321e36793059da7b2e86@syzkaller.appspotmail.com
First crash: 949d, last: 10d
Cause bisection: introduced by (bisect log) :
commit 57f3ff9648991998d008ecf32f2f9e78a08bfb8b
Author: Daniel Rosenberg <drosen@google.com>
Date: Thu Dec 2 21:50:02 2021 +0000

  ANDROID: fuse-bpf v1.1

Crash: BUG: unable to handle kernel NULL pointer dereference in filename_create (log)
Repro: C syz .config
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2023/09/27 android14-6.1 (ToT) ae5ea9043de1 C [report] general protection fault in filename_create
2023/09/27 lts (merge base) b1644a0031cf C Didn't crash
2023/09/27 upstream (ToT) 0e945134b680 C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 general protection fault in filename_create origin:downstream 2 C error unreliable 41 20h16m 1047d 0/2 upstream: reported C repro on 2023/04/29 15:06
android-6-12 general protection fault in filename_create (2) origin:downstream 2 C 14 5d09h 165d 0/1 premoderation: reported C repro on 2025/09/27 02:54
android-5-10 general protection fault in filename_create 2 C 122 2d17h 921d 0/2 upstream: reported C repro on 2023/09/02 15:10
android-6-12 general protection fault in filename_create 2 1 256d 256d 0/1 auto-obsoleted due to no activity on 2025/09/26 14:56
upstream BUG: corrupted list in filename_create fs 8 1 119d 115d 0/29 auto-obsoleted due to no activity on 2026/02/10 19:02
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/02/12 11:04 7m retest repro android14-6.1 report log
2026/02/12 11:04 7m retest repro android14-6.1 report log
2026/02/12 11:04 6m retest repro android14-6.1 report log
2026/02/12 11:04 6m retest repro android14-6.1 report log
2026/02/12 11:04 11m retest repro android14-6.1 report log
2026/01/09 21:43 7m retest repro android14-6.1 report log
2026/01/09 21:43 8m retest repro android14-6.1 report log
2026/01/09 21:43 6m retest repro android14-6.1 report log
2026/01/09 21:43 6m retest repro android14-6.1 report log
2026/01/09 21:43 10m retest repro android14-6.1 report log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/05/13 01:20 39m bisect fix android14-6.1 OK (0) job log log
2024/01/23 08:21 45m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 376 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:455 [inline]
RIP: 0010:filename_create+0x2af/0x470 fs/namei.c:3890
Code: 89 de e8 d4 ea ae ff 85 db 0f 84 8d 00 00 00 e8 a7 e6 ae ff 48 8b 5c 24 20 4c 8b 74 24 18 e9 a4 00 00 00 48 89 c1 48 c1 e9 03 <42> 0f b6 0c 21 84 c9 0f 85 8e 01 00 00 44 8b 20 44 89 e6 81 e6 00
RSP: 0018:ffffc90000b17d60 EFLAGS: 00010203
RAX: 000000000000000d RBX: 1ffff92000162fd3 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8881139fbcc0
RBP: ffffc90000b17e30 R08: ffffc90000b17c47 R09: 1ffff92000162f88
R10: dffffc0000000000 R11: fffff52000162f89 R12: dffffc0000000000
R13: ffffc90000b17e98 R14: 0000000000000600 R15: 000000000000000d
FS:  00007f91a02ff6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000afe0 CR3: 000000012c11e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_mknodat+0xd7/0x7a0 fs/namei.c:4029
 __do_sys_mknod fs/namei.c:4075 [inline]
 __se_sys_mknod fs/namei.c:4073 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4073
 x64_sys_call+0x7d7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:134
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f919f39acb9
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:00007f91a02ff028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f919f615fa0 RCX: 00007f919f39acb9
RDX: 0000000000000704 RSI: 00000000ffff8000 RDI: 00002000000002c0
RBP: 00007f919f408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f919f616038 R14: 00007f919f615fa0 R15: 00007ffccf08a308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:d_is_positive include/linux/dcache.h:455 [inline]
RIP: 0010:filename_create+0x2af/0x470 fs/namei.c:3890
Code: 89 de e8 d4 ea ae ff 85 db 0f 84 8d 00 00 00 e8 a7 e6 ae ff 48 8b 5c 24 20 4c 8b 74 24 18 e9 a4 00 00 00 48 89 c1 48 c1 e9 03 <42> 0f b6 0c 21 84 c9 0f 85 8e 01 00 00 44 8b 20 44 89 e6 81 e6 00
RSP: 0018:ffffc90000b17d60 EFLAGS: 00010203
RAX: 000000000000000d RBX: 1ffff92000162fd3 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8881139fbcc0
RBP: ffffc90000b17e30 R08: ffffc90000b17c47 R09: 1ffff92000162f88
R10: dffffc0000000000 R11: fffff52000162f89 R12: dffffc0000000000
R13: ffffc90000b17e98 R14: 0000000000000600 R15: 000000000000000d
FS:  00007f91a02ff6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000afe0 CR3: 000000012c11e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 de                	mov    %ebx,%esi
   2:	e8 d4 ea ae ff       	call   0xffaeeadb
   7:	85 db                	test   %ebx,%ebx
   9:	0f 84 8d 00 00 00    	je     0x9c
   f:	e8 a7 e6 ae ff       	call   0xffaee6bb
  14:	48 8b 5c 24 20       	mov    0x20(%rsp),%rbx
  19:	4c 8b 74 24 18       	mov    0x18(%rsp),%r14
  1e:	e9 a4 00 00 00       	jmp    0xc7
  23:	48 89 c1             	mov    %rax,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	42 0f b6 0c 21       	movzbl (%rcx,%r12,1),%ecx <-- trapping instruction
  2f:	84 c9                	test   %cl,%cl
  31:	0f 85 8e 01 00 00    	jne    0x1c5
  37:	44 8b 20             	mov    (%rax),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0

Crashes (36):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/24 04:45 android14-6.1 f282db65d7e9 4f25b9b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/11/11 04:23 android14-6.1 86676b1f0b19 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/10/16 04:30 android14-6.1 ce7ac91b1e9d 19568248 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/10/02 23:24 android14-6.1 f6787ec80e17 49379ee0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/07/24 07:52 android14-6.1 96160a0e0aa1 0c1d6ded .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/03/19 08:33 android14-6.1 6bd3e435f2e8 8d0a2921 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/11/10 19:42 android14-6.1 eef3d33656ce 6b856513 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 general protection fault in filename_create
2024/07/12 17:17 android14-6.1 96d66062d076 eaeb5c15 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/07/12 16:46 android14-6.1 96d66062d076 eaeb5c15 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/02/11 05:49 android14-6.1 d3f73f04529a 77b23aa1 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2023/09/27 09:17 android14-6.1 ae5ea9043de1 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2023/08/05 10:28 android14-6.1 5e1d25ac2ab6 cdae481e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/03/01 18:11 android14-6.1 6bfa51973214 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/02/19 14:34 android14-6.1 edbe3e111301 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/01/29 10:30 android14-6.1 28238b5ea70e 0adc945e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/01/25 02:07 android14-6.1 f282db65d7e9 40acda8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/01/20 12:09 android14-6.1 1c6403722ffe 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/01/20 12:09 android14-6.1 1c6403722ffe 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2026/01/18 23:09 android14-6.1 37a76cbe8f87 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/12/21 01:09 android14-6.1 72ada78f601d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/08/15 23:43 android14-6.1 831a57b4a783 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/06/29 03:28 android14-6.1 36d69f6a49eb fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/06/01 13:37 android14-6.1 db710ea87c32 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2025/03/19 07:55 android14-6.1 6bd3e435f2e8 8d0a2921 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/12/04 00:46 android14-6.1 997d1e6f69f1 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/07/12 16:17 android14-6.1 96d66062d076 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/07/12 16:16 android14-6.1 96d66062d076 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/03/28 02:32 android14-6.1 eef3b6e52937 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/03/19 23:37 android14-6.1 e623dd5ac2ac e104824c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/03/03 21:20 android14-6.1 09ca5740fbbe 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/02/23 22:21 android14-6.1 8c0f9174731d 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2024/02/11 05:17 android14-6.1 d3f73f04529a 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2023/11/08 02:30 android14-6.1 230d34da33c5 83211397 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2023/09/25 04:22 android14-6.1 060ebb378d1c 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2023/09/21 22:38 android14-6.1 c6724bfedaad 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
2023/08/05 09:46 android14-6.1 5e1d25ac2ab6 cdae481e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in filename_create
* Struck through repros no longer work on HEAD.