general protection fault in vsscanf

Status: premoderation: reported C repro on 2026/08/18 03:15
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+0a666fde98d6a4837097@syzkaller.appspotmail.com
First crash: 53d, last: 2d18h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/08/24 lts (merge base) 8c9d5557c8e6 C [report] general protection fault in vsscanf
2026/08/24 upstream (ToT) 0a0d1d55dad5 C Didn't crash
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 general protection fault in vsscanf 2 syz, C 95 1d01h 52d 0/2 upstream: reported C repro on 2026/08/18 10:26
linux-5.15 general protection fault in vsscanf origin:lts-only 2 syz, C 17 2d09h 52d 0/3 upstream: reported C repro on 2026/08/18 22:35
linux-6.1 BUG: unable to handle kernel paging request in vsscanf 8 syz, C 77 2d11h 52d 0/3 upstream: reported C repro on 2026/08/18 15:35
linux-6.6 general protection fault in vsscanf 2 syz, C 33 2d09h 51d 0/2 upstream: reported C repro on 2026/08/19 08:56
android-5-15 general protection fault in vsscanf 2 syz, C 42 13d 52d 0/2 upstream: reported C repro on 2026/08/18 22:10
upstream general protection fault in vsscanf (2) mm 2 syz, C 11 657d 663d 28/29 fixed on 2025/05/06 15:33
upstream general protection fault in vsscanf v9fs 2 syz, C 7 2983d 3013d 8/29 fixed on 2018/09/03 14:47
android-49 general protection fault in vsscanf 2 syz, C 6 2963d 2736d 0/3 public: reported C repro on 2019/04/14 00:00
linux-4.19 BUG: unable to handle kernel paging request in vsscanf (2) 8 2 1821d 1923d 0/1 auto-closed as invalid on 2022/02/11 22:53
upstream KMSAN: uninit-value in vsscanf bluetooth 7 syz 9 1682d 1748d 0/29 auto-closed as invalid on 2022/09/27 18:52
linux-4.19 BUG: unable to handle kernel paging request in vsscanf (3) 8 1 1629d 1629d 0/1 auto-closed as invalid on 2022/08/22 19:56

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 312 Comm: syz-executor184 Not tainted syzkaller #0 60889c1c5e6bdc1f3cb1b6a230ba908545dccc71
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:vsscanf+0x18c/0x24b0 lib/vsprintf.c:3444
Code: 48 c7 c6 50 d2 e3 87 e8 c2 39 e5 fb 41 83 fe 25 74 4d 45 85 f6 0f 84 a4 21 00 00 48 ff c3 48 89 5c 24 58 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 8e 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc9000122f5a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff86364fe1 RCX: 0000000000000001
RDX: ffffffff85a2445e RSI: ffffffff87e3d250 RDI: 0000000000000030
RBP: ffffc9000122f6b0 R08: ffff888107b2df00 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff86364fe0
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  0000555575a8f3c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000106ff0000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 sscanf+0xe3/0x150 lib/vsprintf.c:3700
 split_huge_pages_write+0x3c7/0x1220 mm/huge_memory.c:4139
 full_proxy_write+0x128/0x1e0 fs/debugfs/file.c:328
 vfs_write+0x3c1/0xfd0 fs/read_write.c:682
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4616fbac79
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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffdb4cb688 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f4616fbac79
RDX: 000000000000000f RSI: 0000200000000340 RDI: 0000000000000003
RBP: 0067756265642f2e R08: 0000000000000000 R09: 00000000000a8c88
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffdb4cb7b8
R13: 0000000000000002 R14: 00007f461704bca0 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x18c/0x24b0 lib/vsprintf.c:3444
Code: 48 c7 c6 50 d2 e3 87 e8 c2 39 e5 fb 41 83 fe 25 74 4d 45 85 f6 0f 84 a4 21 00 00 48 ff c3 48 89 5c 24 58 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 8e 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc9000122f5a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff86364fe1 RCX: 0000000000000001
RDX: ffffffff85a2445e RSI: ffffffff87e3d250 RDI: 0000000000000030
RBP: ffffc9000122f6b0 R08: ffff888107b2df00 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff86364fe0
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  0000555575a8f3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006a9ee0 CR3: 0000000106ff0000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	48 c7 c6 50 d2 e3 87 	mov    $0xffffffff87e3d250,%rsi
   7:	e8 c2 39 e5 fb       	call   0xfbe539ce
   c:	41 83 fe 25          	cmp    $0x25,%r14d
  10:	74 4d                	je     0x5f
  12:	45 85 f6             	test   %r14d,%r14d
  15:	0f 84 a4 21 00 00    	je     0x21bf
  1b:	48 ff c3             	inc    %rbx
  1e:	48 89 5c 24 58       	mov    %rbx,0x58(%rsp)
  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 8e 1b 00 00    	jne    0x1bc5
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	45 0f b6 f6          	movzbl %r14b,%r14d
  3f:	44                   	rex.R

Crashes (157):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/02 21:35 android16-6.12 3a7d1771d492 57bbd979 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/31 09:32 android16-6.12 96b3287eace8 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/30 04:11 android16-6.12 36bee94a7cf9 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/30 03:10 android16-6.12 36bee94a7cf9 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/29 15:43 android16-6.12 36bee94a7cf9 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/29 11:51 android16-6.12 36bee94a7cf9 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/29 03:44 android16-6.12 36bee94a7cf9 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/28 19:03 android16-6.12 36bee94a7cf9 e2fa417d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/28 11:03 android16-6.12 3ebc81d80f95 e2fa417d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/18 05:28 android16-6.12 83f7e9ec53bb 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/18 04:45 android16-6.12 83f7e9ec53bb 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/08/18 04:04 android16-6.12 83f7e9ec53bb 1e72964b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/10/07 10:33 android16-6.12 85581c945c56 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/30 14:50 android16-6.12 7b10fdf41f2b 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/30 13:24 android16-6.12 7b10fdf41f2b 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/30 03:22 android16-6.12 c95e515a6be2 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/30 00:31 android16-6.12 c95e515a6be2 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/29 22:14 android16-6.12 c95e515a6be2 328436b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/28 11:46 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/28 08:57 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/28 06:36 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/27 20:52 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/27 18:18 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/27 01:56 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/26 21:51 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/26 20:04 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/26 17:25 android16-6.12 516976327553 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/25 18:07 android16-6.12 09f588c04484 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/25 09:25 android16-6.12 558b94a8d268 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/25 06:20 android16-6.12 558b94a8d268 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/24 19:41 android16-6.12 a24919af1c4d 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/24 14:51 android16-6.12 a24919af1c4d 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/24 02:50 android16-6.12 a24919af1c4d 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/23 21:49 android16-6.12 a24919af1c4d abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/23 13:23 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/23 12:19 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/23 11:13 android16-6.12 c8909f7cf138 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/23 09:25 android16-6.12 c8909f7cf138 5207b90e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/22 02:25 android16-6.12 7e3ff613a36b 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/21 23:45 android16-6.12 3b5131b275d2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/21 20:46 android16-6.12 3b5131b275d2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/21 13:34 android16-6.12 3b5131b275d2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/20 20:41 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/20 12:03 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/19 12:36 android16-6.12 dde7e9bf027f 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/19 05:46 android16-6.12 fb15c16e04b2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/19 05:07 android16-6.12 fb15c16e04b2 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/18 17:31 android16-6.12 17176090d7cd 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/18 13:11 android16-6.12 17176090d7cd 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/17 15:12 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/17 14:06 android16-6.12 e79b240621d0 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/17 01:37 android16-6.12 09f57006a67d 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/16 17:17 android16-6.12 1107981d2d5c 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/16 09:51 android16-6.12 1107981d2d5c 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/16 09:51 android16-6.12 1107981d2d5c 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
2026/09/15 16:49 android16-6.12 5c165027e17c 2daa4bb5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust general protection fault in vsscanf
* Struck through repros no longer work on HEAD.