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general protection fault in step_into

Status: upstream: reported C repro on 2023/05/14 14:12
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+94108615026fc2c8a81e@syzkaller.appspotmail.com
First crash: 1019d, last: 6d16h
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 step_into (log)
Repro: C syz .config
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2023/05/14 android14-6.1 (ToT) 6f4553626dbd C [report] general protection fault in step_into
2023/05/14 lts (merge base) be100a8460e3 C Didn't crash
2023/05/14 upstream (ToT) 31f4104e392a C Didn't crash
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 general protection fault in step_into origin:lts-only 11 C done 310 10d 684d 0/3 upstream: reported C repro on 2024/04/13 08:21
upstream general protection fault in step_into fs 2 1 2006d 2002d 0/29 auto-closed as invalid on 2020/11/28 01:59
android-5-10 general protection fault in step_into 2 C done 296 3d16h 1019d 0/2 upstream: reported C repro on 2023/05/14 14:12
linux-6.1 KASAN: null-ptr-deref Read in step_into origin:lts-only 11 C inconclusive 108 5d05h 691d 0/3 upstream: reported C repro on 2024/04/06 11:08
android-5-15 general protection fault in step_into origin:downstream 2 C done 123 6d06h 1019d 0/2 upstream: reported C repro on 2023/05/14 14:01
linux-6.6 general protection fault in step_into origin:lts-only 2 C inconclusive 21 65d 164d 0/2 upstream: reported C repro on 2025/09/14 20:10
android-6-12 general protection fault in step_into origin:downstream 2 C 33 4d02h 240d 0/1 premoderation: reported C repro on 2025/06/30 23:58
upstream BUG: unable to handle kernel paging request in step_into ntfs3 11 C error done 5 782d 1149d 0/29 auto-obsoleted due to no activity on 2024/05/25 15:27
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/01/18 04:12 7m retest repro android14-6.1 report log
2026/01/18 04:12 18m retest repro android14-6.1 report log
2026/01/18 04:12 18m retest repro android14-6.1 report log
2026/01/18 04:12 17m retest repro android14-6.1 report log
2026/01/18 04:12 32m retest repro android14-6.1 report log
2025/12/23 05:38 7m retest repro android14-6.1 report log
2025/12/23 05:38 7m retest repro android14-6.1 report log
2025/12/23 05:38 7m retest repro android14-6.1 report log
2025/12/23 05:38 6m retest repro android14-6.1 report log
2025/12/23 05:38 6m retest repro android14-6.1 report log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/09/17 22:54 1h00m bisect fix android14-6.1 OK (0) job log log
2024/06/05 22:41 1h15m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 PID: 377 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:traverse_mounts fs/namei.c:1438 [inline]
RIP: 0010:handle_mounts fs/namei.c:1550 [inline]
RIP: 0010:step_into+0x125/0xf40 fs/namei.c:1843
Code: 74 24 08 c6 44 24 7f 00 43 0f b6 04 3c 84 c0 4d 89 fd 0f 85 10 0c 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 0f 0c 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000ab7a60 EFLAGS: 00010207
RAX: 0000000000000003 RBX: ffffc90000ab7ca0 RCX: ffff888114369440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000ab7b78 R08: ffff8881242daf67 R09: 1ffff1102485b5ec
R10: dffffc0000000000 R11: ffffed102485b5ed R12: 1ffff92000156f9b
R13: dffffc0000000000 R14: 0000000000000000 R15: 000000000000001d
FS:  00007f295266d6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f295264bff8 CR3: 000000012bf49000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_component+0x24c/0x420 fs/namei.c:2011
 lookup_last fs/namei.c:2462 [inline]
 path_lookupat+0x180/0x490 fs/namei.c:2486
 filename_lookup+0x224/0x560 fs/namei.c:2515
 do_linkat+0xed/0x750 fs/namei.c:4657
 __do_sys_link fs/namei.c:4711 [inline]
 __se_sys_link fs/namei.c:4709 [inline]
 __x64_sys_link+0x86/0x90 fs/namei.c:4709
 x64_sys_call+0x266/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:87
 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: 0033:0x7f295179aeb9
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:00007f295266d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f2951a15fa0 RCX: 00007f295179aeb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000280
RBP: 00007f2951808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2951a16038 R14: 00007f2951a15fa0 R15: 00007ffe4a68bb08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:traverse_mounts fs/namei.c:1438 [inline]
RIP: 0010:handle_mounts fs/namei.c:1550 [inline]
RIP: 0010:step_into+0x125/0xf40 fs/namei.c:1843
Code: 74 24 08 c6 44 24 7f 00 43 0f b6 04 3c 84 c0 4d 89 fd 0f 85 10 0c 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 0f 0c 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000ab7a60 EFLAGS: 00010207
RAX: 0000000000000003 RBX: ffffc90000ab7ca0 RCX: ffff888114369440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000ab7b78 R08: ffff8881242daf67 R09: 1ffff1102485b5ec
R10: dffffc0000000000 R11: ffffed102485b5ed R12: 1ffff92000156f9b
R13: dffffc0000000000 R14: 0000000000000000 R15: 000000000000001d
FS:  00007f295266d6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f295264bff8 CR3: 000000012bf49000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	74 24                	je     0x26
   2:	08 c6                	or     %al,%dh
   4:	44 24 7f             	rex.R and $0x7f,%al
   7:	00 43 0f             	add    %al,0xf(%rbx)
   a:	b6 04                	mov    $0x4,%dh
   c:	3c 84                	cmp    $0x84,%al
   e:	c0 4d 89 fd          	rorb   $0xfd,-0x77(%rbp)
  12:	0f 85 10 0c 00 00    	jne    0xc28
  18:	45 8b 36             	mov    (%r14),%r14d
  1b:	4c 8b bc 24 a8 00 00 	mov    0xa8(%rsp),%r15
  22:	00
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 0f 0c 00 00    	jne    0xc46
  37:	45 8b 3f             	mov    (%r15),%r15d
  3a:	44 89 fe             	mov    %r15d,%esi
  3d:	81                   	.byte 0x81
  3e:	e6 00                	out    %al,$0x0

Crashes (93):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/06 08:41 android14-6.1 c9e2710a7bd0 f03c4191 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2026/01/25 19:20 android14-6.1 5b3c238664a9 40acda8a .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/11/17 02:38 android14-6.1 f090d4b083a9 f7988ea4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in step_into
2025/08/27 23:52 android14-6.1 47b374a18638 e12e5ba4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/08/06 17:06 android14-6.1 39e817cf9025 ffe1dd46 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/04/28 04:09 android14-6.1 a4fc1bef0501 c6b4fb39 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/04/20 17:05 android14-6.1 bc3d1d352ab6 2a20f901 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 general protection fault in step_into
2024/09/24 01:31 android14-6.1 41e1c6f93780 89298aad .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/06/26 19:52 android14-6.1 5747d79ab0b7 c6d33a01 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/02/28 04:05 android14-6.1 d68f68a9d732 d367cbe5 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/01/30 15:54 android14-6.1 9265fa90c1dd 7f400fcb .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/01/08 03:12 android14-6.1 ac90f0829243 d0304e9c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/01/04 16:20 android14-6.1 4d99e41ce174 28c42cff .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 general protection fault in step_into
2023/09/10 09:48 android14-6.1 cd94fe67fd33 6654cf89 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2023/09/09 22:40 android14-6.1 cd94fe67fd33 6654cf89 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2023/08/26 16:42 android14-6.1 4db95aa21ae4 7ba13a15 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2023/05/14 14:51 android14-6.1 6f4553626dbd 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2023/05/14 14:30 android14-6.1 6f4553626dbd 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2023/05/14 14:04 android14-6.1 6f4553626dbd 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2026/02/20 03:39 android14-6.1 edbe3e111301 c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2026/01/31 17:55 android14-6.1 defbecba6f63 afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2026/01/21 12:04 android14-6.1 c298d33764cb 6f1aa2f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2026/01/03 22:34 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/12/09 02:51 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/12/07 05:28 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/11/08 23:17 android14-6.1 50ba6c46f3ac 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/11/06 02:23 android14-6.1 616b19ad1f68 a6c9c731 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/10/29 15:42 android14-6.1 7ca912bfce3d fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/06/17 16:03 android14-6.1 6246d345f550 cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2025/04/20 16:27 android14-6.1 bc3d1d352ab6 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/11/30 19:21 android14-6.1 a887a44ace2a 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/07/30 22:36 android14-6.1 7fa70ede91bb 6fde257d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/06/27 14:12 android14-6.1 74a3c59c8087 6ef39602 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/06/26 19:31 android14-6.1 5747d79ab0b7 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/04/21 15:19 android14-6.1 dcb09569bbff af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/04/05 01:39 android14-6.1 60534eef4739 0ee3535e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/30 16:55 android14-6.1 5b8114ec3c92 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/28 22:47 android14-6.1 8f2f0a3b12b9 e91187ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/27 14:49 android14-6.1 eef3b6e52937 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/27 12:54 android14-6.1 eef3b6e52937 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/27 04:35 android14-6.1 eef3b6e52937 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/26 21:44 android14-6.1 8790a94475c9 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/26 00:58 android14-6.1 8790a94475c9 bcd9b39f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/25 08:34 android14-6.1 d518ca9dbbe9 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/25 05:18 android14-6.1 d518ca9dbbe9 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/21 07:35 android14-6.1 75266774b9c4 6753db5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/19 19:38 android14-6.1 e623dd5ac2ac e104824c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/19 09:59 android14-6.1 e623dd5ac2ac baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/19 00:05 android14-6.1 4292d259032a baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/18 12:22 android14-6.1 ef39f76e4d24 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/18 11:16 android14-6.1 ef39f76e4d24 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/18 04:40 android14-6.1 ef39f76e4d24 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/17 15:33 android14-6.1 ef39f76e4d24 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/16 14:49 android14-6.1 ef39f76e4d24 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/16 08:20 android14-6.1 ef39f76e4d24 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/13 13:18 android14-6.1 e897dadaf348 db5b7ff0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/12 19:28 android14-6.1 bb197cebd544 c35c26ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/10 02:34 android14-6.1 5f66e7c904ee 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/09 15:22 android14-6.1 5f66e7c904ee 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/03/04 07:15 android14-6.1 09ca5740fbbe 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2024/02/29 09:38 android14-6.1 4289e1348ea3 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
2023/05/14 13:40 android14-6.1 6f4553626dbd 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in step_into
* Struck through repros no longer work on HEAD.