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general protection fault in step_into

Status: upstream: reported C repro on 2023/05/14 14:12
Reported-by: syzbot+0eeb26335ddeb506c6d0@syzkaller.appspotmail.com
First crash: 1086d, last: 2h26m
Cause bisection: introduced by (bisect log) :
commit 6be5b06e4195b002c52a1c2c82573ea7a76ce111
Author: Daniel Rosenberg <drosen@google.com>
Date: Thu Dec 2 22:38:56 2021 +0000

  ANDROID: fuse-bpf v1

Crash: general protection fault in step_into (log)
Repro: C syz .config
  
▶ ▼ 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 312 12d 751d 0/3 upstream: reported C repro on 2024/04/13 08:21
upstream general protection fault in step_into fs 2 1 2073d 2069d 0/29 auto-closed as invalid on 2020/11/28 01:59
linux-6.1 KASAN: null-ptr-deref Read in step_into origin:lts-only 11 C inconclusive 108 72d 758d 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 127 16h33m 1086d 0/2 upstream: reported C repro on 2023/05/14 14:01
android-6-1 general protection fault in step_into origin:downstream 2 C done 99 15d 1086d 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 C inconclusive 22 14d 231d 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 37 21d 307d 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 849d 1216d 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
2025/10/18 21:43 5m retest repro android13-5.10-lts report log
2025/10/18 21:43 8m retest repro android13-5.10-lts report log
2025/10/18 21:43 5m retest repro android13-5.10-lts report log
2025/10/18 21:43 29m retest repro android13-5.10-lts report log
2025/10/18 21:43 11m retest repro android13-5.10-lts report log
2025/08/04 00:54 5m retest repro android13-5.10-lts report log
2025/08/04 00:54 5m retest repro android13-5.10-lts report log
2025/08/04 00:54 1h04m retest repro android13-5.10-lts report log
2025/08/04 00:54 7m retest repro android13-5.10-lts report log
2025/08/04 00:54 5m retest repro android13-5.10-lts report 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: 360 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:traverse_mounts fs/namei.c:1365 [inline]
RIP: 0010:handle_mounts fs/namei.c:1485 [inline]
RIP: 0010:step_into+0x12a/0xd00 fs/namei.c:1790
Code: c6 44 24 5f 00 43 0f b6 44 25 00 84 c0 48 8b 54 24 08 0f 85 59 0a 00 00 44 8b 32 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000c07a40 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffffc90000c07c60 RCX: ffff88810d543b40
RDX: ffffc90000c07c98 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000c07b28 R08: 0000000000000000 R09: 1ffff1102423d2e4
R10: dffffc0000000000 R11: ffffed102423d2e5 R12: dffffc0000000000
R13: 1ffff92000180f93 R14: 0000000000000001 R15: 0000000000000010
FS:  00007f32151536c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010f4c6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 walk_component+0x26a/0x460 fs/namei.c:1966
 lookup_last fs/namei.c:2411 [inline]
 path_lookupat+0x180/0x490 fs/namei.c:2435
 filename_lookup+0x213/0x6a0 fs/namei.c:2468
 user_path_at_empty+0x43/0x50 fs/namei.c:2748
 user_path_at include/linux/namei.h:60 [inline]
 do_mount fs/namespace.c:3346 [inline]
 __do_sys_mount fs/namespace.c:3557 [inline]
 __se_sys_mount+0x2eb/0x390 fs/namespace.c:3534
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f3215311799
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:00007f3215153028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f321558b090 RCX: 00007f3215311799
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f32153a7c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f321558b128 R14: 00007f321558b090 R15: 00007ffd53259138
Modules linked in:
---[ end trace aad669f5cdb6e8d5 ]---
RIP: 0010:traverse_mounts fs/namei.c:1365 [inline]
RIP: 0010:handle_mounts fs/namei.c:1485 [inline]
RIP: 0010:step_into+0x12a/0xd00 fs/namei.c:1790
Code: c6 44 24 5f 00 43 0f b6 44 25 00 84 c0 48 8b 54 24 08 0f 85 59 0a 00 00 44 8b 32 4c 8b bc 24 88 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00
RSP: 0018:ffffc90000c07a40 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffffc90000c07c60 RCX: ffff88810d543b40
RDX: ffffc90000c07c98 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000c07b28 R08: 0000000000000000 R09: 1ffff1102423d2e4
R10: dffffc0000000000 R11: ffffed102423d2e5 R12: dffffc0000000000
R13: 1ffff92000180f93 R14: 0000000000000001 R15: 0000000000000010
FS:  00007f32151536c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f321535ee80 CR3: 000000010f4c6000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c6 44 24 5f 00       	movb   $0x0,0x5f(%rsp)
   5:	43 0f b6 44 25 00    	movzbl 0x0(%r13,%r12,1),%eax
   b:	84 c0                	test   %al,%al
   d:	48 8b 54 24 08       	mov    0x8(%rsp),%rdx
  12:	0f 85 59 0a 00 00    	jne    0xa71
  18:	44 8b 32             	mov    (%rdx),%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 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 5e 0a 00 00    	jne    0xa95
  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 (318):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/23 22:33 android13-5.10-lts 9136079e403a 4933dba2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/12 23:15 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/09/09 23:17 android13-5.10-lts 48647f2c6800 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/08/20 19:01 android13-5.10-lts 1154f779f3f3 0b9605c8 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/06/19 22:41 android13-5.10-lts d76d4cd0623a ed3e87f7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 general protection fault in step_into
2025/04/30 04:48 android13-5.10-lts ab07aeb2c93d 85a5a23f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/02/26 22:56 android13-5.10-lts 3f5f2283d684 6a8fcbc4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/01/24 13:25 android13-5.10-lts fbe98d68b6b3 521b0ce3 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2024/10/13 05:39 android13-5.10-lts e5e5644ea27f 084d8178 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2024/06/28 20:25 android13-5.10-lts a4a2b7a82ee4 757f06b1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2024/06/03 19:03 android13-5.10-lts d3c4d815bf09 0aba2352 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2024/02/22 21:32 android13-5.10-lts dd976ecce2ce 8d446f15 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2024/01/08 07:08 android13-5.10-lts f7977422e132 d0304e9c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2024/01/03 16:31 android13-5.10-lts f7977422e132 fb427a07 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-10 general protection fault in step_into
2023/09/25 03:22 android13-5.10-lts a27512601c2d 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2023/09/23 08:27 android13-5.10-lts a27512601c2d 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2023/08/26 11:26 android13-5.10-lts c6a1fbd8e4aa 7ba13a15 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2023/05/14 14:41 android13-5.10-lts 43c801dc3325 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2023/05/14 14:19 android13-5.10-lts 43c801dc3325 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2023/05/14 14:02 android13-5.10-lts 43c801dc3325 2b9ba477 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/05/04 14:50 android13-5.10-lts 7ae299a5827a 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/05/03 12:37 android13-5.10-lts 7ae299a5827a a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/29 13:25 android13-5.10-lts 7ae299a5827a 7ca9e4d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/23 02:56 android13-5.10-lts d8c55bf860fd b10da5ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/18 16:06 android13-5.10-lts cc0ae2abdc73 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/15 07:50 android13-5.10-lts cc0ae2abdc73 e2e976a8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/07 00:49 android13-5.10-lts cc0ae2abdc73 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/06 08:05 android13-5.10-lts cc0ae2abdc73 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/05 11:19 android13-5.10-lts cc0ae2abdc73 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/04/04 16:19 android13-5.10-lts cc0ae2abdc73 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/29 22:26 android13-5.10-lts cc0ae2abdc73 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/29 05:25 android13-5.10-lts cc0ae2abdc73 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/23 21:41 android13-5.10-lts 9136079e403a 4933dba2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/22 00:49 android13-5.10-lts 9136079e403a 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/19 14:01 android13-5.10-lts 9136079e403a bd6dcb30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/17 01:27 android13-5.10-lts 9136079e403a 0737c18f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/12 13:38 android13-5.10-lts 9136079e403a 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/11 08:25 android13-5.10-lts 9136079e403a 86914af9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/03 18:25 android13-5.10-lts dad37bbb13a8 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/02 09:12 android13-5.10-lts dad37bbb13a8 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/03/01 04:41 android13-5.10-lts dad37bbb13a8 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/23 03:38 android13-5.10-lts e8b14e1cefe8 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/21 15:41 android13-5.10-lts e8b14e1cefe8 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/17 13:24 android13-5.10-lts e8b14e1cefe8 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/15 20:18 android13-5.10-lts e8b14e1cefe8 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/09 08:30 android13-5.10-lts 58c592510fcd 4c131dc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/02 00:49 android13-5.10-lts 186f761c519d 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/02/01 18:24 android13-5.10-lts 186f761c519d 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/20 08:00 android13-5.10-lts e253c52bbdfc 572effc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/18 01:25 android13-5.10-lts e253c52bbdfc 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/16 12:31 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/14 21:56 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/14 18:41 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/09 10:56 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/08 06:01 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/04 03:28 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2026/01/01 03:57 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/31 09:52 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/30 08:47 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/29 10:30 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/25 13:50 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/22 10:45 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/21 13:06 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/15 19:07 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/13 03:42 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/11 09:38 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/08 07:35 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/07 00:25 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2025/12/06 06:25 android13-5.10-lts 9286af17ed5f d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
2023/05/14 13:45 android13-5.10-lts 43c801dc3325 2b9ba477 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in step_into
* Struck through repros no longer work on HEAD.