general protection fault in kernfs_find_ns

Status: upstream: reported C repro on 2023/09/09 18:30
Reported-by: syzbot+c03842d041f269840123@syzkaller.appspotmail.com
First crash: 1129d, last: 17h00m
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in kernfs_find_ns kernfs 2 2 1779d 1774d 0/29 auto-closed as invalid on 2022/03/29 00:22
android-54 general protection fault in kernfs_find_ns 2 1 1971d 1971d 0/2 auto-closed as invalid on 2021/09/18 09:16
android-54 general protection fault in kernfs_find_ns (2) 2 syz, C 21 560d 1814d 0/2 upstream: reported C repro on 2021/10/24 20:02
linux-5.15 KASAN: slab-out-of-bounds Read in kernfs_find_ns 17 2 358d 366d 0/3 auto-obsoleted due to no activity on 2026/01/28 00:39
linux-5.15 KASAN: global-out-of-bounds Read in kernfs_find_ns 17 1 500d 500d 0/3 auto-obsoleted due to no activity on 2025/09/08 00:48
linux-6.1 KASAN: use-after-free Read in kernfs_find_ns 19 syz, C 2 40d 72d 0/3 upstream: reported C repro on 2026/08/01 21:32
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/08/16 14:34 15m retest repro android13-5.10-lts report job log log
2026/07/04 04:03 12m retest repro android13-5.10-lts log
2026/07/04 04:03 16m retest repro android13-5.10-lts log
2026/06/12 16:04 2h30m retest repro android13-5.10-lts log
2026/06/01 10:40 14m retest repro android13-5.10-lts log
2026/04/21 21:53 14m retest repro android13-5.10-lts report log
2026/04/21 21:53 12m retest repro android13-5.10-lts report log
2026/04/03 14:06 35m retest repro android13-5.10-lts report log
2026/03/08 06:17 9m retest repro android13-5.10-lts report log
2026/02/10 01:03 1h03m retest repro android13-5.10-lts report log
▶ ▼ Fix bisection attempts (7)
Created Duration User Patch Repo Result
2024/11/05 23:09 0m bisect fix android13-5.10-lts error job log
2024/09/18 23:06 42m bisect fix android13-5.10-lts OK (0) job log log
2024/07/20 23:09 57m bisect fix android13-5.10-lts OK (0) job log log
2024/05/23 19:22 2h36m bisect fix android13-5.10-lts OK (0) job log log
2024/04/19 04:46 1h03m bisect fix android13-5.10-lts OK (0) job log log
2024/02/12 18:43 35m bisect fix android13-5.10-lts OK (0) job log log
2024/01/13 06:39 48m bisect fix android13-5.10-lts OK (0) job log log

Sample crash report:
RBP: 0000000000000002 R08: 00000000000000a0 R09: 00000000000000a0
R10: 00007ffc2ca91846 R11: 0000000000000246 R12: 00007ffc2ca91abc
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
---[ end trace 69abe628f50f1ac5 ]---
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: 449 Comm: syz-executor851 Tainted: G        W         5.10.209-syzkaller-00435-gdd976ecce2ce #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:strlen+0x2c/0x70 lib/string.c:568
Code: 89 e5 41 57 41 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01
RSP: 0018:ffffc90000d67b98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000001
RDX: ffff8881102713c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000d67bb8 R08: ffffffff81d2f3ab R09: ffffed102000b22f
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555572ea380(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4305d47c40 CR3: 000000010ff1e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kernfs_name_hash fs/kernfs/dir.c:309 [inline]
 kernfs_find_ns+0x95/0x4a0 fs/kernfs/dir.c:880
 kernfs_remove_by_name_ns+0x87/0x160 fs/kernfs/dir.c:1580
 kernfs_remove_by_name include/linux/kernfs.h:623 [inline]
 sysfs_remove_link+0x50/0x60 fs/sysfs/symlink.c:152
 del_gendisk+0x87b/0xa90 block/genhd.c:951
 loop_remove+0x46/0xb0 drivers/block/loop.c:2210
 loop_control_ioctl+0x564/0x620 drivers/block/loop.c:2309
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x114/0x190 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f4305d14d39
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc2ca91aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffc2ca91ac0 RCX: 00007f4305d14d39
RDX: 000000000000000b RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 0000000000000002 R08: 00000000000000a0 R09: 00000000000000a0
R10: 00007ffc2ca91846 R11: 0000000000000246 R12: 00007ffc2ca91abc
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
Modules linked in:
---[ end trace 69abe628f50f1ac6 ]---
RIP: 0010:strlen+0x2c/0x70 lib/string.c:568
Code: 89 e5 41 57 41 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01
RSP: 0018:ffffc90000d67b98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000001
RDX: ffff8881102713c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000d67bb8 R08: ffffffff81d2f3ab R09: ffffed102000b22f
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555572ea380(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4305d47c40 CR3: 000000010ff1e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 e5                	mov    %esp,%ebp
   2:	41 57                	push   %r15
   4:	41 56                	push   %r14
   6:	41 54                	push   %r12
   8:	53                   	push   %rbx
   9:	49 89 fe             	mov    %rdi,%r14
   c:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
  13:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  1a:	fc ff df
  1d:	48 89 fb             	mov    %rdi,%rbx
  20:	49 89 c4             	mov    %rax,%r12
  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:	75 12                	jne    0x45
  33:	48 ff c3             	inc    %rbx
  36:	49 8d 44 24 01       	lea    0x1(%r12),%rax
  3b:	43                   	rex.XB
  3c:	80                   	.byte 0x80
  3d:	7c 26                	jl     0x65
  3f:	01                   	.byte 0x1

Crashes (104):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/02 15:37 android13-5.10-lts dd976ecce2ce 25905f5d .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2023/09/30 18:32 android13-5.10-lts a27512601c2d 8e26a358 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2023/09/30 04:36 android13-5.10-lts a27512601c2d 8e26a358 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2023/09/09 18:19 android13-5.10-lts a27512601c2d 6654cf89 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/12 21:03 android13-5.10-lts 437aef3f57e8 745a967f .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/11 13:07 android13-5.10-lts b677692288f7 4f92358f .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/09 09:11 android13-5.10-lts b677692288f7 b2734a59 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/08 07:19 android13-5.10-lts b677692288f7 4f6a9fcf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/07 19:33 android13-5.10-lts b677692288f7 6520ecdb .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/07 04:06 android13-5.10-lts 207de56dd089 f7710056 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/06 20:53 android13-5.10-lts 207de56dd089 f7710056 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/05 05:38 android13-5.10-lts 42d4fb705937 57bbd979 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 06:58 android13-5.10-lts 452567d1985b 0281b448 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/17 05:56 android13-5.10-lts 452567d1985b 95928915 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/07 17:08 android13-5.10-lts b677692288f7 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/07 07:30 android13-5.10-lts 207de56dd089 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/06 08:52 android13-5.10-lts 207de56dd089 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/06 01:25 android13-5.10-lts 207de56dd089 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/04 01:05 android13-5.10-lts 8ddf8d57c49c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/10/01 01:58 android13-5.10-lts 27ea5541934c 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/30 19:48 android13-5.10-lts 27ea5541934c 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/30 09:12 android13-5.10-lts 27ea5541934c 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/30 09:10 android13-5.10-lts 27ea5541934c 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/29 03:33 android13-5.10-lts 340d402887d3 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/28 17:34 android13-5.10-lts 903d9c6a2636 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/27 21:00 android13-5.10-lts c5d8ec7afea2 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/27 08:20 android13-5.10-lts c5d8ec7afea2 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/26 17:30 android13-5.10-lts c5d8ec7afea2 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/26 01:04 android13-5.10-lts c5d8ec7afea2 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/25 11:02 android13-5.10-lts 452567d1985b f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/25 09:10 android13-5.10-lts 452567d1985b f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 20:12 android13-5.10-lts 452567d1985b 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 14:42 android13-5.10-lts 452567d1985b 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 13:35 android13-5.10-lts 452567d1985b 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 10:38 android13-5.10-lts 452567d1985b 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 04:47 android13-5.10-lts 452567d1985b 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/24 02:27 android13-5.10-lts 452567d1985b 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/23 22:34 android13-5.10-lts 452567d1985b abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/23 20:05 android13-5.10-lts 452567d1985b abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/23 16:46 android13-5.10-lts 452567d1985b abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/22 09:32 android13-5.10-lts 452567d1985b e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/20 19:36 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/20 09:10 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/19 18:29 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/19 09:44 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/19 02:25 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:55 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2026/09/18 14:53 android13-5.10-lts 452567d1985b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
2023/09/09 17:57 android13-5.10-lts a27512601c2d 6654cf89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in kernfs_find_ns
* Struck through repros no longer work on HEAD.