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: 1299d, last: 6d01h
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 (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 syz, C done 313 58d 930d 0/3 upstream: reported C repro on 2024/04/13 08:21
upstream general protection fault in step_into fs 2 1 2252d 2248d 0/29 auto-closed as invalid on 2020/11/28 01:59
android-5-10 general protection fault in step_into 2 syz, C done 356 19d 1265d 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 syz, C inconclusive 109 62d 937d 0/3 upstream: reported C repro on 2024/04/06 11:08
android-6-1 general protection fault in step_into origin:downstream 2 syz, C done inconclusive 113 6d23h 1265d 0/2 upstream: reported C repro on 2023/05/14 14:12
linux-6.6 general protection fault in step_into origin:lts-only 2 syz, C inconclusive 22 193d 411d 0/2 upstream: reported C repro on 2025/09/14 20:10
android-6-12 general protection fault in step_into origin:downstream 2 syz, C 62 5d07h 487d 0/1 premoderation: reported C repro on 2025/06/30 23:58
upstream BUG: unable to handle kernel paging request in step_into ntfs 11 syz, C error done 5 1029d 1395d 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
2026/10/24 23:13 10m retest repro android13-5.15-lts report job log log
2026/10/24 23:13 9m retest repro android13-5.15-lts report job log log
2026/10/24 23:13 9m retest repro android13-5.15-lts report job log log
2026/10/24 23:13 10m retest repro android13-5.15-lts report job log log
2026/10/24 23:13 13m retest repro android13-5.15-lts report job log log
2026/09/23 15:42 13m retest repro android13-5.15-lts report job log log
2026/09/23 15:42 8m retest repro android13-5.15-lts report job log log
2026/09/23 15:42 8m retest repro android13-5.15-lts report job log log
2026/09/23 15:42 32m retest repro android13-5.15-lts report job log log
2026/09/23 15:42 13m retest repro android13-5.15-lts report job log log
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2026/08/04 13:12 3h22m bisect fix android13-5.15-lts OK (0) job log log
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 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 304 Comm: syz-executor414 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:traverse_mounts fs/namei.c:1386 [inline]
RIP: 0010:handle_mounts fs/namei.c:1506 [inline]
RIP: 0010:step_into+0x122/0xce0 fs/namei.c:1814
Code: 24 10 4c 8d 73 38 c6 44 24 5f 00 43 0f b6 04 2c 84 c0 0f 85 57 0a 00 00 45 8b 36 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 56 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc900009a78c0 EFLAGS: 00010203
RAX: 0000000000000001 RBX: ffffc900009a7ac0 RCX: ffff88810b40a800
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009a79a8 R08: 0000000000000000 R09: 1ffff110244d01c4
R10: dffffc0000000000 R11: ffffed10244d01c5 R12: 1ffff92000134f5f
R13: dffffc0000000000 R14: 0000000000004005 R15: 000000000000000f
FS:  00007fdea8c416c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000a000 CR3: 000000012540b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_component+0x263/0x460 fs/namei.c:1990
 lookup_last fs/namei.c:2439 [inline]
 path_lookupat+0x155/0x430 fs/namei.c:2463
 filename_lookup+0x21e/0x550 fs/namei.c:2492
 user_path_at_empty+0x46/0x1c0 fs/namei.c:2891
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x109/0xa20 fs/stat.c:221
 do_statx fs/stat.c:615 [inline]
 __do_sys_statx fs/stat.c:638 [inline]
 __se_sys_statx fs/stat.c:633 [inline]
 __x64_sys_statx+0x1ba/0x260 fs/stat.c:633
 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:333
 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: 0033:0x7fdea8c5ff39
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdea8c41218 EFLAGS: 00000246 ORIG_RAX: 000000000000014c
RAX: ffffffffffffffda RBX: 00007fdea8d10b68 RCX: 00007fdea8c5ff39
RDX: 0000000000001000 RSI: 0000200000000640 RDI: 00000000ffffff9c
RBP: 00007fdea8d10b60 R08: 0000000000000000 R09: 33203a6b63617473
R10: 0000000000000100 R11: 0000000000000246 R12: 00007fdea8cde424
R13: 0000200000008200 R14: 00002000000020c0 R15: 00007fdea8cda03a
 </TASK>
Modules linked in:
---[ end trace 365f97c73b6779da ]---
RIP: 0010:traverse_mounts fs/namei.c:1386 [inline]
RIP: 0010:handle_mounts fs/namei.c:1506 [inline]
RIP: 0010:step_into+0x122/0xce0 fs/namei.c:1814
Code: 24 10 4c 8d 73 38 c6 44 24 5f 00 43 0f b6 04 2c 84 c0 0f 85 57 0a 00 00 45 8b 36 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 56 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc900009a78c0 EFLAGS: 00010203
RAX: 0000000000000001 RBX: ffffc900009a7ac0 RCX: ffff88810b40a800
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900009a79a8 R08: 0000000000000000 R09: 1ffff110244d01c4
R10: dffffc0000000000 R11: ffffed10244d01c5 R12: 1ffff92000134f5f
R13: dffffc0000000000 R14: 0000000000004005 R15: 000000000000000f
FS:  00007fdea8c416c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000a000 CR3: 000000012540b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	24 10                	and    $0x10,%al
   2:	4c 8d 73 38          	lea    0x38(%rbx),%r14
   6:	c6 44 24 5f 00       	movb   $0x0,0x5f(%rsp)
   b:	43 0f b6 04 2c       	movzbl (%r12,%r13,1),%eax
  10:	84 c0                	test   %al,%al
  12:	0f 85 57 0a 00 00    	jne    0xa6f
  18:	45 8b 36             	mov    (%r14),%r14d
  1b:	4c 8b bc 24 88 00 00 	mov    0x88(%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 56 0a 00 00    	jne    0xa8d
  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 (143):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/05 21:54 android13-5.15-lts f5eaed2bbe33 af63e995 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/06/30 10:51 android13-5.15-lts c85054db4618 fff8d0a0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/06/10 10:38 android13-5.15-lts 30f5554a846e 34dab4be .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/05/31 01:56 android13-5.15-lts 8969ee93a483 6b4a8443 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/04/05 01:02 android13-5.15-lts 7fad219d720d 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/02/01 04:33 android13-5.15-lts 7e1070528954 6b8752f2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/21 02:21 android13-5.15-lts 630deefd7859 06648d9c .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/11/01 00:17 android13-5.15-lts 1edb21e89ce4 2c50b6a9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 general protection fault in step_into
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
2026/09/30 01:17 android13-5.15-lts f6f638556ea7 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/09/25 12:12 android13-5.15-lts 5bfe2b8c1439 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/09/25 12:12 android13-5.15-lts 5bfe2b8c1439 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/09/03 18:55 android13-5.15-lts e9b8a6529ffa 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/09/02 03:16 android13-5.15-lts 7f9a109e0767 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/08/14 04:42 android13-5.15-lts 54275df9611d b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/07/04 07:04 android13-5.15-lts a64de05eba09 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/06/04 11:21 android13-5.15-lts 8969ee93a483 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/05/16 16:19 android13-5.15-lts 7f4b368e0410 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/05/04 00:43 android13-5.15-lts e63ebedc51b2 a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/04/11 09:08 android13-5.15-lts 7fad219d720d 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/03/08 22:51 android13-5.15-lts 4fc7ded323e3 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/02/20 13:58 android13-5.15-lts 13d6d33696ef 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/02/16 05:28 android13-5.15-lts 13d6d33696ef 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/02/04 23:22 android13-5.15-lts 7e1070528954 ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/02/02 02:21 android13-5.15-lts 7e1070528954 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/19 06:23 android13-5.15-lts 050dc55b0457 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/15 05:43 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/13 12:03 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/12 19:17 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/10 00:04 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/08 13:48 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/06 14:33 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2026/01/04 11:11 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/12/27 20:33 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/12/21 13:06 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/12/13 11:38 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/12/07 05:42 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/12/02 08:42 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/11/05 01:44 android13-5.15-lts 8a8f52308945 686bf657 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/10/29 16:04 android13-5.15-lts 1edb21e89ce4 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/09/17 09:34 android13-5.15-lts 8d934e0056f7 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in step_into
2025/08/31 06:32 android13-5.15-lts f32b52534f1d 807a3b61 .config console log report info [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
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.