general protection fault in input_ff_flush

Status: moderation: reported on 2026/10/08 22:52
Subsystems: input
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+6249d66d81d2c3a3e025@syzkaller.appspotmail.com
First crash: 4d18h, last: 2d11h
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ID Workflow Result Correct Bug Created Started Finished Revision
ed84439d assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ✅ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ general protection fault in input_ff_flush 2026/10/06 00:54 2026/10/06 00:54 2026/10/06 01:19 1995e6c7

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]
CPU: 0 UID: 0 PID: 4963 Comm: acpid Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x149/0x1550 kernel/locking/mutex.c:821
Code: c0 40 e5 9e 9a 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 3f 12 00 00 83 3d 05 15 b6 0e 00 75 22 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 6c 53 4f f6 4d 39 64 24 58 0f 85 52 11 00 00
RSP: 0018:ffffc900035e7b40 EFLAGS: 00010212
RAX: 0000000000000015 RBX: dffffc0000000000 RCX: ffffffff9a9ee503
RDX: 0000000000000000 RSI: ffffffff8e69fd9a RDI: 00000000000000a8
RBP: ffffc900035e7cd8 R08: ffffc900035e7c47 R09: ffffc900035e7c20
R10: dffffc0000000000 R11: fffff520006bcf89 R12: 0000000000000050
R13: 0000000000000000 R14: 1ffff920006bcf7c R15: 0000000000000000
FS:  00007f4d8608a780(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c13a27dac CR3: 000000002bf0d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 class_mutex_constructor include/linux/mutex.h:253 [inline]
 input_ff_flush+0x5e/0x170 drivers/input/ff-core.c:231
 input_flush_device+0xd6/0x130 drivers/input/input.c:685
 evdev_release+0xda/0x7f0 drivers/input/evdev.c:440
 __fput+0x418/0xa50 fs/file_table.c:512
 fput_close_sync+0x11f/0x240 fs/file_table.c:617
 __do_sys_close fs/open.c:1560 [inline]
 __se_sys_close fs/open.c:1545 [inline]
 __x64_sys_close+0x7e/0x110 fs/open.c:1545
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d86114407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffe72ff8d90 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f4d8608a780 RCX: 00007f4d86114407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00007ffe72ff8f50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000040
R13: 00007ffe72ff9050 R14: 000055d1b85cf7fe R15: 00007ffe72ff9070
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline]
RIP: 0010:__mutex_lock+0x149/0x1550 kernel/locking/mutex.c:821
Code: c0 40 e5 9e 9a 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 3f 12 00 00 83 3d 05 15 b6 0e 00 75 22 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 6c 53 4f f6 4d 39 64 24 58 0f 85 52 11 00 00
RSP: 0018:ffffc900035e7b40 EFLAGS: 00010212
RAX: 0000000000000015 RBX: dffffc0000000000 RCX: ffffffff9a9ee503
RDX: 0000000000000000 RSI: ffffffff8e69fd9a RDI: 00000000000000a8
RBP: ffffc900035e7cd8 R08: ffffc900035e7c47 R09: ffffc900035e7c20
R10: dffffc0000000000 R11: fffff520006bcf89 R12: 0000000000000050
R13: 0000000000000000 R14: 1ffff920006bcf7c R15: 0000000000000000
FS:  00007f4d8608a780(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000565028ee0331 CR3: 000000002bf0d000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 5 bytes skipped:
   0:	48 c1 e8 03          	shr    $0x3,%rax
   4:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax
   8:	84 c0                	test   %al,%al
   a:	0f 85 3f 12 00 00    	jne    0x124f
  10:	83 3d 05 15 b6 0e 00 	cmpl   $0x0,0xeb61505(%rip)        # 0xeb6151c
  17:	75 22                	jne    0x3b
  19:	49 8d 7c 24 58       	lea    0x58(%r12),%rdi
  1e:	48 89 f8             	mov    %rdi,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
* 25:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  29:	74 05                	je     0x30
  2b:	e8 6c 53 4f f6       	call   0xf64f539c
  30:	4d 39 64 24 58       	cmp    %r12,0x58(%r12)
  35:	0f 85 52 11 00 00    	jne    0x118d

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/07 06:00 upstream 69f80fef3153 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in input_ff_flush
2026/10/04 22:51 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 639df5d23876 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb general protection fault in input_ff_flush
* Struck through repros no longer work on HEAD.