BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: null-ptr-deref in __tcf_idr_release net/sched/act_api.c:162 [inline]
BUG: KASAN: null-ptr-deref in tcf_idrinfo_destroy+0xb9/0x220 net/sched/act_api.c:561

CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
 __dump_stack+0x1e/0x20 lib/dump_stack.c:77
 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118
 check_memory_region_inline mm/kasan/generic.c:141 [inline]
 check_memory_region+0x274/0x280 mm/kasan/generic.c:191
 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
 __tcf_idr_release net/sched/act_api.c:162 [inline]
 tcf_idrinfo_destroy+0xb9/0x220 net/sched/act_api.c:561
 process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290
 kthread+0x31e/0x3a0 kernel/kthread.c:288
kasan: GPF could be caused by NULL-ptr deref or user memory access
CPU: 0 PID: 7 Comm: kworker/u4:0 Tainted: G    B             5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Workqueue: netns cleanup_net
Code: 40 e8 b4 6b af 00 48 85 c0 0f 84 1a 01 00 00 49 89 c4 4c 8d 68 20 4c 89 ef be 04 00 00 00 e8 37 05 1b fe 4c 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 ba 00 00 00 45 8b 6d 00 31 ff 44 89 ee
RAX: 0000000000000002 RBX: ffff8881d601bfa0 RCX: ffff8881f5d6af40
RBP: ffff8881f5db7c08 R08: 0000000000000004 R09: 0000000000000003
R13: 0000000000000010 R14: ffffffff861b59f0 R15: dffffc0000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Call Trace:
CR2: 00007f53408d3d60 CR3: 00000001ec87e000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	40 e8 b4 6b af 00    	rex call 0xaf6bba
   6:	48 85 c0             	test   %rax,%rax
   9:	0f 84 1a 01 00 00    	je     0x129
   f:	49 89 c4             	mov    %rax,%r12
  12:	4c 8d 68 20          	lea    0x20(%rax),%r13
  16:	4c 89 ef             	mov    %r13,%rdi
  19:	be 04 00 00 00       	mov    $0x4,%esi
  1e:	e8 37 05 1b fe       	call   0xfe1b055a
  23:	4c 89 e8             	mov    %r13,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 ba 00 00 00    	jne    0xf1
  37:	45 8b 6d 00          	mov    0x0(%r13),%r13d
  3b:	31 ff                	xor    %edi,%edi
  3d:	44 89 ee             	mov    %r13d,%esi