syzbot


general protection fault in mon_text_release

Status: moderation: reported on 2026/04/10 06:18
Subsystems: usb
[Documentation on labels]
Reported-by: syzbot+e1e97a4ad1cbac79361e@syzkaller.appspotmail.com
First crash: 6d20h, last: 6d20h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel NULL pointer dereference in mon_text_release usb 10 1 113d 109d 0/29 auto-obsoleted due to no activity on 2026/03/20 18:19

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0x4bffff88807aaa1f: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 8 PID: 12024 Comm: syz.6.1339 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:qlist_move_cache+0x64/0xe0 mm/kasan/quarantine.c:302
Code: 26 49 83 3e 00 0f 84 8d 00 00 00 49 8b 46 08 4c 89 28 4d 89 6e 08 49 c7 45 00 00 00 00 00 49 01 56 10 4d 85 ff 74 62 4d 89 fd <4d> 8b 3f 4c 89 ef e8 c1 92 45 ff 48 c1 e8 0c 48 c1 e0 06 48 03 05
RSP: 0018:ffffc90003447948 EFLAGS: 00010002
RAX: ffff888023738000 RBX: ffffc90003447980 RCX: ffff88801ce9063f
RDX: 0000000000000100 RSI: ffffffff81b986d8 RDI: ffff888029869e80
RBP: ffff8880863d0280 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 4bffff88807aaa1f R14: ffffffff9b1fdfc0 R15: 4bffff88807aaa1f
FS:  0000000000000000(0000) GS:ffff888124340000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f74161e9f00 CR3: 0000000148d5c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kasan_quarantine_remove_cache+0xf7/0x170 mm/kasan/quarantine.c:370
 kmem_cache_destroy mm/slab_common.c:567 [inline]
 kmem_cache_destroy+0x6b/0x180 mm/slab_common.c:527
 mon_text_release+0x267/0x3b0 drivers/usb/mon/mon_text.c:677
 full_proxy_release+0xc0/0x140 fs/debugfs/file.c:427
 __fput+0x3ff/0xb40 fs/file_table.c:469
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x8b8/0x2b60 kernel/exit.c:976
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1118
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x668/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e0e99c819
Code: Unable to access opcode bytes at 0x7f3e0e99c7ef.
RSP: 002b:00007f3e0f8c80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f3e0ec15fa8 RCX: 00007f3e0e99c819
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3e0ec15fac
RBP: 00007f3e0ec15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3e0ec16038 R14: 00007ffd97092f50 R15: 00007ffd97093038
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_move_cache+0x64/0xe0 mm/kasan/quarantine.c:302
Code: 26 49 83 3e 00 0f 84 8d 00 00 00 49 8b 46 08 4c 89 28 4d 89 6e 08 49 c7 45 00 00 00 00 00 49 01 56 10 4d 85 ff 74 62 4d 89 fd <4d> 8b 3f 4c 89 ef e8 c1 92 45 ff 48 c1 e8 0c 48 c1 e0 06 48 03 05
RSP: 0018:ffffc90003447948 EFLAGS: 00010002
RAX: ffff888023738000 RBX: ffffc90003447980 RCX: ffff88801ce9063f
RDX: 0000000000000100 RSI: ffffffff81b986d8 RDI: ffff888029869e80
RBP: ffff8880863d0280 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 4bffff88807aaa1f R14: ffffffff9b1fdfc0 R15: 4bffff88807aaa1f
FS:  0000000000000000(0000) GS:ffff888124340000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f74161e9f00 CR3: 0000000148d5c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	26 49 83 3e 00       	es cmpq $0x0,(%r14)
   5:	0f 84 8d 00 00 00    	je     0x98
   b:	49 8b 46 08          	mov    0x8(%r14),%rax
   f:	4c 89 28             	mov    %r13,(%rax)
  12:	4d 89 6e 08          	mov    %r13,0x8(%r14)
  16:	49 c7 45 00 00 00 00 	movq   $0x0,0x0(%r13)
  1d:	00
  1e:	49 01 56 10          	add    %rdx,0x10(%r14)
  22:	4d 85 ff             	test   %r15,%r15
  25:	74 62                	je     0x89
  27:	4d 89 fd             	mov    %r15,%r13
* 2a:	4d 8b 3f             	mov    (%r15),%r15 <-- trapping instruction
  2d:	4c 89 ef             	mov    %r13,%rdi
  30:	e8 c1 92 45 ff       	call   0xff4592f6
  35:	48 c1 e8 0c          	shr    $0xc,%rax
  39:	48 c1 e0 06          	shl    $0x6,%rax
  3d:	48                   	rex.W
  3e:	03                   	.byte 0x3
  3f:	05                   	.byte 0x5

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/06 06:14 upstream 1791c390149f 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto general protection fault in mon_text_release
* Struck through repros no longer work on HEAD.