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: 24 Comm: kworker/1:0 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events nsim_dev_hwstats_traffic_work
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 67 19 de ff 49 83 3e 00 0f 85 84 00 00 00 e8 78 ee 79 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 42 19 de ff 4c 8b 33 4d 85 f6 74
RSP: 0018:ffffc90000a08b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801d688000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88805b6610f0
RBP: 0000000000000001 R08: ffff88805b661083 R09: 1ffff1100b6cc210
R10: dffffc0000000000 R11: ffffed100b6cc211 R12: 1ffff1100b6cc21d
R13: ffffffff81a8bfb4 R14: ffff88805b6610e8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002d000 CR3: 0000000040ee0000 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+0x286/0x870 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:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5181
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 e9 27 05 00 00 4c 8b 75 d0 4c 89 e7 e8 5f f5 dd 09 e8 ba fc 35 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900001e7658 EFLAGS: 00000282
RAX: 724238aeb6183100 RBX: 0000000000000000 RCX: 724238aeb6183100
RDX: 0000000000000006 RSI: ffffffff8d991d22 RDI: ffffffff8be320a0
RBP: ffffc900001e76b0 R08: ffffffff8fa193f7 R09: 1ffffffff1f4327e
R10: dffffc0000000000 R11: fffffbfff1f4327f R12: ffff88801d688000
R13: dffffc0000000000 R14: ffff888020758000 R15: ffff8880b873ab18
 context_switch kernel/sched/core.c:5316 [inline]
 __schedule+0x16fd/0x4d00 kernel/sched/core.c:6696
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7019
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:nsim_dev_hwstats_traffic_bump drivers/net/netdevsim/hwstats.c:32 [inline]
RIP: 0010:nsim_dev_hwstats_traffic_work+0x143/0x190 drivers/net/netdevsim/hwstats.c:48
Code: d9 ac fa e9 35 ff ff ff 44 89 e9 80 e1 07 38 c1 0f 8c 3f ff ff ff 4c 89 ef e8 79 03 11 fb e9 32 ff ff ff e8 1f d9 ac fa eb 05 <e8> 18 d9 ac fa 4c 89 f7 e8 20 38 5b 04 48 c7 c0 00 83 bb 8d 48 c1
RSP: 0018:ffffc900001e7a48 EFLAGS: 00000246
RAX: 1ffff1100d58149f RBX: ffff88806ac0a520 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8be32080 RDI: 00000000ffffffff
RBP: dffffc0000000000 R08: ffffffff8fa193f7 R09: 1ffffffff1f4327e
R10: dffffc0000000000 R11: fffffbfff1f4327f R12: ffff88806ac0a4f8
R13: ffff88801ced0e18 R14: ffff88806ac0a468 R15: ffff88806ac0a4f8
 process_one_work kernel/workqueue.c:3239 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 67 19 de ff 49 83 3e 00 0f 85 84 00 00 00 e8 78 ee 79 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 42 19 de ff 4c 8b 33 4d 85 f6 74
RSP: 0018:ffffc90000a08b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801d688000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88805b6610f0
RBP: 0000000000000001 R08: ffff88805b661083 R09: 1ffff1100b6cc210
R10: dffffc0000000000 R11: ffffed100b6cc211 R12: 1ffff1100b6cc21d
R13: ffffffff81a8bfb4 R14: ffff88805b6610e8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002d000 CR3: 0000000040ee0000 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 67 19 de ff       	call   0xffde197b
  14:	49 83 3e 00          	cmpq   $0x0,(%r14)
  18:	0f 85 84 00 00 00    	jne    0xa2
  1e:	e8 78 ee 79 ff       	call   0xff79ee9b
  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 42 19 de ff       	call   0xffde197b
  39:	4c 8b 33             	mov    (%rbx),%r14
  3c:	4d 85 f6             	test   %r14,%r14
  3f:	74                   	.byte 0x74