Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007]
CPU: 0 UID: 0 PID: 5849 Comm: syz-executor Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline]
RIP: 0010:percpu_ref_get_many+0x8d/0x140 include/linux/percpu-refcount.h:204
Code: 01 48 c7 c7 60 4d 98 8b be 4b 03 00 00 48 c7 c2 a0 4d 98 8b e8 a4 c2 71 ff 49 bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 d4 4d f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc90003f6fa40 EFLAGS: 00010006
RAX: 000000001fffe000 RBX: ffffffff822bc3e9 RCX: d274355739635b00
RDX: 0000000000000000 RSI: ffffffff8be340e0 RDI: ffffffff8be340a0
RBP: 0000000000000078 R08: 0000000000000000 R09: ffffffff822bc3e9
R10: dffffc0000000000 R11: fffffbfff1f44307 R12: dffffc0000000000
R13: ffff8880b863b500 R14: 0000000000000001 R15: 00000000ffff0000
FS:  000055555f66b500(0000) GS:ffff888125c43000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c369a11 CR3: 0000000059472000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
 obj_cgroup_get include/linux/memcontrol.h:772 [inline]
 refill_obj_stock+0x254/0x850 mm/memcontrol.c:3042
 __memcg_slab_free_hook+0x127/0x3d0 mm/memcontrol.c:3216
 memcg_slab_free_hook mm/slub.c:2242 [inline]
 slab_free mm/slub.c:4677 [inline]
 kmem_cache_free+0x223/0x400 mm/slub.c:4782
 __sigqueue_free kernel/signal.c:475 [inline]
 collect_signal kernel/signal.c:587 [inline]
 __dequeue_signal+0x487/0x5b0 kernel/signal.c:609
 dequeue_signal+0x1a2/0x370 kernel/signal.c:632
 get_signal+0x55f/0x1340 kernel/signal.c:2914
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f88571c1425
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fff7650ace0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 000000000000017c RCX: 00007f88571c1425
RDX: 00007fff7650ad20 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff7650ad8c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000055fdb R15: 00007fff7650ade0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline]
RIP: 0010:percpu_ref_get_many+0x8d/0x140 include/linux/percpu-refcount.h:204
Code: 01 48 c7 c7 60 4d 98 8b be 4b 03 00 00 48 c7 c2 a0 4d 98 8b e8 a4 c2 71 ff 49 bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 d4 4d f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc90003f6fa40 EFLAGS: 00010006
RAX: 000000001fffe000 RBX: ffffffff822bc3e9 RCX: d274355739635b00
RDX: 0000000000000000 RSI: ffffffff8be340e0 RDI: ffffffff8be340a0
RBP: 0000000000000078 R08: 0000000000000000 R09: ffffffff822bc3e9
R10: dffffc0000000000 R11: fffffbfff1f44307 R12: dffffc0000000000
R13: ffff8880b863b500 R14: 0000000000000001 R15: 00000000ffff0000
FS:  000055555f66b500(0000) GS:ffff888125c43000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c369a11 CR3: 0000000059472000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	48 c7 c7 60 4d 98 8b 	mov    $0xffffffff8b984d60,%rdi
   7:	be 4b 03 00 00       	mov    $0x34b,%esi
   c:	48 c7 c2 a0 4d 98 8b 	mov    $0xffffffff8b984da0,%rdx
  13:	e8 a4 c2 71 ff       	call   0xff71c2bc
  18:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  1f:	fc ff df
  22:	4c 89 f8             	mov    %r15,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 d4 4d f7 ff       	call   0xfff74e0c
  38:	49 8b 07             	mov    (%r15),%rax
  3b:	a8 03                	test   $0x3,%al
  3d:	75 62                	jne    0xa1