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: 5231 Comm: udevd Not tainted 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 00 4b 98 8b be 4b 03 00 00 48 c7 c2 40 4b 98 8b e8 24 bf 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 e4 4d f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc90003637810 EFLAGS: 00010006
RAX: 000000001fffe000 RBX: ffffffff822bc619 RCX: 703c2640717d1800
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000078 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: dffffc0000000000
R13: ffff8880b863b540 R14: 0000000000000001 R15: 00000000ffff0000
FS:  00007f1317c03880(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f598bdaff98 CR3: 000000007be9e000 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
 signalfd_dequeue fs/signalfd.c:162 [inline]
 signalfd_read_iter+0x2b7/0x980 fs/signalfd.c:216
 new_sync_read fs/read_write.c:491 [inline]
 vfs_read+0x557/0xa30 fs/read_write.c:572
 ksys_read+0x145/0x250 fs/read_write.c:715
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f13174a7407
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:00007ffee8fa3f30 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f1317c03880 RCX: 00007f13174a7407
RDX: 0000000000000080 RSI: 00007ffee8fa4170 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
R13: 0000561fd6e47100 R14: 0000000000000001 R15: 0000000000000000
 </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 00 4b 98 8b be 4b 03 00 00 48 c7 c2 40 4b 98 8b e8 24 bf 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 e4 4d f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc90003637810 EFLAGS: 00010006
RAX: 000000001fffe000 RBX: ffffffff822bc619 RCX: 703c2640717d1800
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: 0000000000000078 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: dffffc0000000000
R13: ffff8880b863b540 R14: 0000000000000001 R15: 00000000ffff0000
FS:  00007f1317c03880(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f598bdaff98 CR3: 000000007be9e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	01 48 c7             	add    %ecx,-0x39(%rax)
   3:	c7 00 4b 98 8b be    	movl   $0xbe8b984b,(%rax)
   9:	4b 03 00             	rex.WXB add (%r8),%rax
   c:	00 48 c7             	add    %cl,-0x39(%rax)
   f:	c2 40 4b             	ret    $0x4b40
  12:	98                   	cwtl
  13:	8b e8                	mov    %eax,%ebp
  15:	24 bf                	and    $0xbf,%al
  17:	71 ff                	jno    0x18
  19:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  20:	fc ff df
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 e4 4d f7 ff       	call   0xfff74e1d
  39:	49 8b 07             	mov    (%r15),%rax
  3c:	a8 03                	test   $0x3,%al
  3e:	75 62                	jne    0xa2