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general protection fault in path_openat

Status: upstream: reported C repro on 2023/05/21 01:53
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+8aec6edbebda4c971b84@syzkaller.appspotmail.com
First crash: 894d, last: 13d
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: general protection fault in path_openat (log)
Repro: C syz .config
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2023/09/14 android14-6.1 (ToT) 85902d60cd82 C [report] general protection fault in path_openat
2023/09/14 lts (merge base) b1644a0031cf C Didn't crash
2023/09/14 upstream (ToT) aed8aee11130 C Didn't crash
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 general protection fault in path_openat origin:downstream 2 C 2 52d 64d 0/1 premoderation: reported C repro on 2025/08/28 16:04
upstream BUG: unable to handle kernel paging request in path_openat reiserfs 8 C error inconclusive 52 667d 1065d 0/29 auto-obsoleted due to no activity on 2024/04/12 10:28
android-5-10 general protection fault in path_openat 2 C done 40 1d21h 894d 0/2 upstream: reported C repro on 2023/05/21 01:33
linux-4.19 general protection fault in path_openat 2 C done 13 2095d 2101d 1/1 fixed on 2020/03/06 08:34
upstream general protection fault in path_openat ext4 2 C done 7 2099d 2099d 15/29 fixed on 2020/02/18 14:31
linux-4.14 general protection fault in path_openat 2 C done 40 2095d 2101d 1/1 fixed on 2020/03/06 21:15
android-5-15 general protection fault in path_openat origin:downstream 2 C done 14 11d 894d 0/2 upstream: reported C repro on 2023/05/21 01:53
android-54 general protection fault in path_openat 2 syz 26 2094d 2101d 1/2 fixed on 2021/10/12 13:38
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/10/18 02:03 7m retest repro android14-6.1 report log
2025/10/18 02:03 8m retest repro android14-6.1 report log
2025/10/18 02:03 6m retest repro android14-6.1 report log
2025/10/18 02:03 9m retest repro android14-6.1 report log
2025/08/22 20:32 7m retest repro android14-6.1 report log
2025/08/08 17:57 11m retest repro android14-6.1 report log
2025/08/08 17:57 9m retest repro android14-6.1 report log
2025/08/08 17:57 15m retest repro android14-6.1 report log
2025/08/08 17:57 14m retest repro android14-6.1 report log
2025/06/08 23:43 6m retest repro android14-6.1 report log
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2024/10/14 23:06 0m bisect fix android14-6.1 error job log
2024/08/29 03:35 40m bisect fix android14-6.1 OK (0) job log log
2024/06/26 09:03 58m bisect fix android14-6.1 OK (0) job log log
2024/04/28 12:19 1h06m bisect fix android14-6.1 OK (0) job log log
2024/02/25 15:47 39m bisect fix android14-6.1 OK (0) job log log
2024/01/18 21:54 40m bisect fix android14-6.1 OK (0) job log log
2023/11/12 14:49 41m bisect fix android14-6.1 OK (0) job log log
2023/07/31 10:47 1h02m bisect fix android14-6.1 OK (0) job log log
2023/06/20 20:45 39m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 293 Comm: syz-executor251 Not tainted 6.1.141-syzkaller-00040-g2dbfabb0eec8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:atomic_open fs/namei.c:3360 [inline]
RIP: 0010:lookup_open fs/namei.c:3452 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3549 [inline]
RIP: 0010:path_openat+0x1235/0x2f50 fs/namei.c:3779
Code: 89 df e8 4e 88 02 00 49 63 de 48 81 fb 00 f0 ff ff 0f 87 cd f7 ff ff eb 63 e8 67 0a b0 ff 4c 8b 6c 24 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 64 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000dd79a0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000017 RCX: ffff88810def5100
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88810def5100
RBP: ffffc90000dd7bb0 R08: dffffc0000000000 R09: fffff520001baf19
R10: fffff520001baf19 R11: 1ffff920001baf18 R12: 0000000000000002
R13: ffffc90000dd7c00 R14: ffff88812559c018 R15: dffffc0000000000
FS:  00007f940c2086c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f940c208d58 CR3: 0000000125406000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x1c1/0x3c0 fs/namei.c:3809
 do_sys_openat2+0x185/0x7e0 fs/open.c:1341
 do_sys_open fs/open.c:1357 [inline]
 __do_sys_open fs/open.c:1365 [inline]
 __se_sys_open fs/open.c:1361 [inline]
 __x64_sys_open+0x11c/0x140 fs/open.c:1361
 x64_sys_call+0x97b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:3
 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: 0033:0x7f940c267779
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f940c208218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f940c2f43f8 RCX: 00007f940c267779
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00002000000001c0
RBP: 00007f940c2f43f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f940c2c103c
R13: 00002000000042c0 R14: 00002000000001c0 R15: 00007ffe095dcf08
 </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:atomic_open fs/namei.c:3360 [inline]
RIP: 0010:lookup_open fs/namei.c:3452 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3549 [inline]
RIP: 0010:path_openat+0x1235/0x2f50 fs/namei.c:3779
Code: 89 df e8 4e 88 02 00 49 63 de 48 81 fb 00 f0 ff ff 0f 87 cd f7 ff ff eb 63 e8 67 0a b0 ff 4c 8b 6c 24 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 64 0d 00 00 44 8b 33 be 00 00 70 00 44
RSP: 0018:ffffc90000dd79a0 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000017 RCX: ffff88810def5100
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88810def5100
RBP: ffffc90000dd7bb0 R08: dffffc0000000000 R09: fffff520001baf19
R10: fffff520001baf19 R11: 1ffff920001baf18 R12: 0000000000000002
R13: ffffc90000dd7c00 R14: ffff88812559c018 R15: dffffc0000000000
FS:  00007f940c2086c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f940c208d58 CR3: 0000000125406000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 df                	mov    %ebx,%edi
   2:	e8 4e 88 02 00       	call   0x28855
   7:	49 63 de             	movslq %r14d,%rbx
   a:	48 81 fb 00 f0 ff ff 	cmp    $0xfffffffffffff000,%rbx
  11:	0f 87 cd f7 ff ff    	ja     0xfffff7e4
  17:	eb 63                	jmp    0x7c
  19:	e8 67 0a b0 ff       	call   0xffb00a85
  1e:	4c 8b 6c 24 10       	mov    0x10(%rsp),%r13
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 64 0d 00 00    	jne    0xd9b
  37:	44 8b 33             	mov    (%rbx),%r14d
  3a:	be 00 00 70 00       	mov    $0x700000,%esi
  3f:	44                   	rex.R

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/21 19:43 android14-6.1 2dbfabb0eec8 56d87229 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2025/07/21 19:12 android14-6.1 2dbfabb0eec8 56d87229 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2025/01/05 02:20 android14-6.1 e2b9748880b9 f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/09/14 05:24 android14-6.1 c2ac612610e0 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/05/21 01:52 android14-6.1 cffbdd825e02 4bce1a3e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2025/01/05 01:41 android14-6.1 e2b9748880b9 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2025/01/05 01:41 android14-6.1 e2b9748880b9 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2024/03/27 18:32 android14-6.1 eef3b6e52937 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/12/03 17:59 android14-6.1 6465e29536ed f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/11/26 23:57 android14-6.1 d2c0f4c4502a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/11/25 02:19 android14-6.1 d2c0f4c4502a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
* Struck through repros no longer work on HEAD.