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general protection fault in step_into

Status: upstream: reported C repro on 2023/05/14 14:01
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+08c6e82116d52c4fffaa@syzkaller.appspotmail.com
First crash: 872d, last: 3d18h
Cause bisection: introduced by (bisect log) :
commit f5f4199c102aa676998b42abff60d071385c1c0c
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
2023/09/05 android13-5.15-lts (ToT) 1317bd27a72f C [report] general protection fault in step_into
2023/09/05 lts (merge base) 8f790700c974 C Didn't crash
2023/09/05 upstream (ToT) 65d6e954e378 C Didn't crash
▶ ▼ Similar bugs (7)
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 287 12d 503d 0/3 upstream: reported C repro on 2024/04/13 08:21
upstream general protection fault in step_into fs 2 1 1826d 1822d 0/29 auto-closed as invalid on 2020/11/28 01:59
android-5-10 general protection fault in step_into 2 C done 242 4d12h 838d 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 65 4d05h 510d 0/3 upstream: reported C repro on 2024/04/06 11:08
android-6-1 general protection fault in step_into origin:downstream 2 C done 80 2d07h 838d 0/2 upstream: reported C repro on 2023/05/14 14:12
android-6-12 general protection fault in step_into origin:downstream 2 C 14 3d07h 60d 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 602d 968d 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
2025/08/20 08:56 8m retest repro android13-5.15-lts report log
2025/08/20 08:56 9m retest repro android13-5.15-lts report log
2025/08/20 08:56 13m retest repro android13-5.15-lts report log
2025/07/20 15:14 1h04m retest repro android13-5.15-lts report log
2025/07/20 15:14 11m retest repro android13-5.15-lts report log
2025/07/20 15:14 6m retest repro android13-5.15-lts report log
2025/07/20 15:14 7m retest repro android13-5.15-lts report log
2025/07/20 15:14 5m retest repro android13-5.15-lts report log
2025/07/05 18:46 6m retest repro android13-5.15-lts report log
2025/07/05 18:46 5m retest repro android13-5.15-lts report log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/10/24 07:29 1h54m bisect fix android13-5.15-lts OK (0) job log log
2024/09/06 03:19 33m bisect fix android13-5.15-lts OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 291 Comm: syz-executor376 Not tainted 5.15.189-syzkaller-android13-5.15.189_r00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:traverse_mounts fs/namei.c:1378 [inline]
RIP: 0010:handle_mounts fs/namei.c:1498 [inline]
RIP: 0010:step_into+0x12e/0xd10 fs/namei.c:1806
Code: 4c 8b 74 24 18 c6 44 24 7f 00 43 0f b6 44 25 00 84 c0 0f 85 6f 0a 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 6e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc900009f78c0 EFLAGS: 00010247
RAX: 0000000000000000 RBX: ffffc900009f7b00 RCX: ffff8881063ae2c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009f79c8 R08: 0000000000000000 R09: ffffed10240c2815
R10: ffffed10240c2815 R11: 1ffff110240c2814 R12: dffffc0000000000
R13: 1ffff9200013ef67 R14: 0000000000000000 R15: 0000000000000005
FS:  00007fdd9fa866c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d71a116eb8 CR3: 000000012406d000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_component+0x26a/0x460 fs/namei.c:1982
 lookup_last fs/namei.c:2431 [inline]
 path_lookupat+0x180/0x490 fs/namei.c:2455
 filename_lookup+0x1e2/0x4f0 fs/namei.c:2484
 user_path_at_empty+0x47/0x1c0 fs/namei.c:2883
 user_path_at include/linux/namei.h:57 [inline]
 path_removexattr+0xb3/0x3b0 fs/xattr.c:866
 __do_sys_lremovexattr fs/xattr.c:891 [inline]
 __se_sys_lremovexattr fs/xattr.c:888 [inline]
 __x64_sys_lremovexattr+0x5d/0x70 fs/xattr.c:888
 x64_sys_call+0x220/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:199
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdd9fae5639
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:00007fdd9fa86218 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6
RAX: ffffffffffffffda RBX: 00007fdd9fb723f8 RCX: 00007fdd9fae5639
RDX: 00007fdd9fae5639 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007fdd9fb723f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdd9fb3f02c
R13: 000020000000c280 R14: 0000200000000580 R15: 00007fffe7e6f178
 </TASK>
Modules linked in:
---[ end trace 8fdd118db1357603 ]---
RIP: 0010:traverse_mounts fs/namei.c:1378 [inline]
RIP: 0010:handle_mounts fs/namei.c:1498 [inline]
RIP: 0010:step_into+0x12e/0xd10 fs/namei.c:1806
Code: 4c 8b 74 24 18 c6 44 24 7f 00 43 0f b6 44 25 00 84 c0 0f 85 6f 0a 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 6e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc900009f78c0 EFLAGS: 00010247
RAX: 0000000000000000 RBX: ffffc900009f7b00 RCX: ffff8881063ae2c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009f79c8 R08: 0000000000000000 R09: ffffed10240c2815
R10: ffffed10240c2815 R11: 1ffff110240c2814 R12: dffffc0000000000
R13: 1ffff9200013ef67 R14: 0000000000000000 R15: 0000000000000005
FS:  00007fdd9fa866c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d71a116eb8 CR3: 000000012406d000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 8b 74 24 18       	mov    0x18(%rsp),%r14
   5:	c6 44 24 7f 00       	movb   $0x0,0x7f(%rsp)
   a:	43 0f b6 44 25 00    	movzbl 0x0(%r13,%r12,1),%eax
  10:	84 c0                	test   %al,%al
  12:	0f 85 6f 0a 00 00    	jne    0xa87
  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 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 6e 0a 00 00    	jne    0xaa5
  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 (95):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/25 01:45 android13-5.15-lts f32b52534f1d bf27483f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/08/05 02:29 android13-5.15-lts f32b52534f1d f5bcc8dc .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/05/28 21:44 android13-5.15-lts 4032a894ccb2 3d2f584d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/05/05 03:27 android13-5.15-lts 88c4075c39ed b0714e37 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/02/17 08:08 android13-5.15-lts 058abb720bd1 40a34ec9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/10/28 13:17 android13-5.15-lts 5e4635681cf1 65e8686b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/02/28 09:43 android13-5.15-lts 993bed180178 d367cbe5 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/01/08 03:44 android13-5.15-lts 92ec34b6c034 d0304e9c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/01/04 09:26 android13-5.15-lts 1370e896a3b8 28c42cff .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 general protection fault in step_into
2023/09/08 10:07 android13-5.15-lts ea586874d2f9 72324844 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2023/09/05 20:35 android13-5.15-lts 1317bd27a72f 0b6286dc .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2023/05/14 14:51 android13-5.15-lts 19c0ed55a470 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2023/05/14 14:30 android13-5.15-lts 19c0ed55a470 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2023/05/14 13:55 android13-5.15-lts 19c0ed55a470 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/08/26 13:04 android13-5.15-lts f32b52534f1d bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/07/28 00:52 android13-5.15-lts a71626bd56a5 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/06/17 16:04 android13-5.15-lts e678c93d43cc cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/06/09 17:01 android13-5.15-lts e678c93d43cc 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/05/18 16:24 android13-5.15-lts 57725b368731 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/03/03 04:02 android13-5.15-lts 7d1f9b5c2ff5 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/02/17 07:18 android13-5.15-lts 058abb720bd1 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/12/09 23:09 android13-5.15-lts 431fb5556be3 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/12/08 16:39 android13-5.15-lts 431fb5556be3 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/11/30 19:25 android13-5.15-lts 548ca9fbf844 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/11/30 19:24 android13-5.15-lts 548ca9fbf844 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/11/09 21:12 android13-5.15-lts 5e4635681cf1 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/10/28 12:31 android13-5.15-lts 5e4635681cf1 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/09/21 21:47 android13-5.15-lts b92c0d35d015 6f888b75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/07/06 09:56 android13-5.15-lts 9044d25b8ff5 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/07/01 14:02 android13-5.15-lts 9044d25b8ff5 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/06/27 02:49 android13-5.15-lts 9044d25b8ff5 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/06/20 09:28 android13-5.15-lts 85445b5a2107 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/05/29 15:49 android13-5.15-lts 424f92bcbe8f 34889ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/04/17 22:27 android13-5.15-lts ad06eaf051cd acc528cb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/04/08 03:49 android13-5.15-lts 993bed180178 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/29 20:33 android13-5.15-lts 993bed180178 c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/25 08:32 android13-5.15-lts 993bed180178 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/24 05:07 android13-5.15-lts 993bed180178 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/23 21:33 android13-5.15-lts 993bed180178 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/22 21:33 android13-5.15-lts 993bed180178 4b6cdce6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/21 07:41 android13-5.15-lts 993bed180178 6753db5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/20 20:18 android13-5.15-lts 993bed180178 5b7d42ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/20 12:17 android13-5.15-lts 993bed180178 a485f239 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/19 00:06 android13-5.15-lts 993bed180178 baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/18 05:08 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/17 15:30 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/16 19:49 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/16 13:49 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/16 08:41 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/15 21:48 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/15 12:44 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/13 14:03 android13-5.15-lts 993bed180178 db5b7ff0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/12 10:00 android13-5.15-lts 993bed180178 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/03/04 09:12 android13-5.15-lts 993bed180178 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/02/19 09:02 android13-5.15-lts 993bed180178 578f7538 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/02/11 05:11 android13-5.15-lts 3802b45594e1 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2024/01/21 13:34 android13-5.15-lts 1c3a1f32bcbd 9bd8dcda .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2023/12/15 19:29 android13-5.15-lts 05ef4ccb5774 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2023/05/01 03:03 android13-5.15-lts 6d40cb68a657 62df2017 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
* Struck through repros no longer work on HEAD.