Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 6566 Comm: syz-executor Not tainted 6.16.0-rc3-next-20250623-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pidfs_free_pid+0xaf/0x140 fs/pidfs.c:162
Code: f0 ff ff 73 e4 43 80 3c 3c 00 74 08 4c 89 f7 e8 a7 1b de ff 49 83 3e 00 0f 85 84 00 00 00 e8 08 f2 79 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 82 1b de ff 4c 8b 33 4d 85 f6 74
RSP: 0000:ffffc90000a08b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888027553c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff888030ac7b70
RBP: 0000000000000001 R08: ffff888030ac7b03 R09: 1ffff11006158f60
R10: dffffc0000000000 R11: ffffed1006158f61 R12: 1ffff11006158f6d
R13: ffffffff81a83684 R14: ffff888030ac7b68 R15: dffffc0000000000
FS:  0000555584de9500(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84086e8704 CR3: 000000006713e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 put_pid+0x9c/0x130 kernel/pid.c:103
 rcu_do_batch kernel/rcu/tree.c:2582 [inline]
 rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2838
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_preemption_disabled+0x17/0x120 lib/smp_processor_id.c:14
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 05 de 1d 32 07 48 89 44 24 08 <65> 8b 05 e6 1d 32 07 65 8b 0d db 1d 32 07 f7 c1 ff ff ff 7f 74 23
RSP: 0000:ffffc9000460fd60 EFLAGS: 00000286
RAX: c3de040a4547b800 RBX: ffffffff820b16f1 RCX: 0000000000000000
RDX: ffff888027553c00 RSI: ffffffff8be322a0 RDI: ffffffff8be32260
RBP: 0000000000000017 R08: 0000000000000000 R09: ffffffff820b16f1
R10: dffffc0000000000 R11: fffff940003f72df R12: 0000000000001255
R13: ffff888027553c00 R14: ffff888024536b80 R15: 0000000000000001
 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
 rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:751
 rcu_read_lock include/linux/rcupdate.h:842 [inline]
 count_memcg_events_mm include/linux/memcontrol.h:975 [inline]
 count_memcg_event_mm+0x5c/0x260 include/linux/memcontrol.h:985
 mm_account_fault mm/memory.c:6264 [inline]
 handle_mm_fault+0x50f/0x8e0 mm/memory.c:6425
 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f84079445e9
Code: da 00 01 5b c3 0f 1f 40 00 48 8d 3d 31 41 da 00 e8 6c 0a 00 00 eb de 66 2e 0f 1f 84 00 00 00 00 00 8b 05 1e 41 da 00 83 e8 01 <89> 05 15 41 da 00 75 16 48 c7 05 0c 41 da 00 00 00 00 00 87 05 fe
RSP: 002b:00007ffeb086f9d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8407985193
RDX: 00000000000001a3 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555584de97d0 R11: 0000000000000246 R12: 00000000000001a3
R13: ffffffffffffffa8 R14: 0000000000000006 R15: 00007ffeb086fb70
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pidfs_free_pid+0xaf/0x140 fs/pidfs.c:162
Code: f0 ff ff 73 e4 43 80 3c 3c 00 74 08 4c 89 f7 e8 a7 1b de ff 49 83 3e 00 0f 85 84 00 00 00 e8 08 f2 79 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 82 1b de ff 4c 8b 33 4d 85 f6 74
RSP: 0000:ffffc90000a08b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888027553c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff888030ac7b70
RBP: 0000000000000001 R08: ffff888030ac7b03 R09: 1ffff11006158f60
R10: dffffc0000000000 R11: ffffed1006158f61 R12: 1ffff11006158f6d
R13: ffffffff81a83684 R14: ffff888030ac7b68 R15: dffffc0000000000
FS:  0000555584de9500(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84086e8704 CR3: 000000006713e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	f0 ff                	lock (bad)
   2:	ff 73 e4             	push   -0x1c(%rbx)
   5:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1)
   a:	74 08                	je     0x14
   c:	4c 89 f7             	mov    %r14,%rdi
   f:	e8 a7 1b de ff       	call   0xffde1bbb
  14:	49 83 3e 00          	cmpq   $0x0,(%r14)
  18:	0f 85 84 00 00 00    	jne    0xa2
  1e:	e8 08 f2 79 ff       	call   0xff79f22b
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 82 1b de ff       	call   0xffde1bbb
  39:	4c 8b 33             	mov    (%rbx),%r14
  3c:	4d 85 f6             	test   %r14,%r14
  3f:	74                   	.byte 0x74