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: 14896 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: 0018:ffffc90000a08b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888058915a00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88805853ac70
RBP: 0000000000000001 R08: ffff88805853ac03 R09: 1ffff1100b0a7580
R10: dffffc0000000000 R11: ffffed100b0a7581 R12: 1ffff1100b0a758d
R13: ffffffff81a83684 R14: ffff88805853ac68 R15: dffffc0000000000
FS:  000055556d528500(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 0000000077a9a000 CR4: 00000000003526f0
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:x64_sys_call+0x40e/0x21c0 arch/x86/entry/syscall_64.c:37
Code: 00 81 fe 1e 01 00 00 0f 8f b5 1b 00 00 81 fe 1d 01 00 00 0f 84 23 fe ff 00 81 fe 1e 01 00 00 0f 84 a7 87 17 01 e9 79 1d 00 00 <83> fe 2a 0f 8e a8 03 00 00 83 fe 31 0f 8e a8 09 00 00 83 fe 35 0f
RSP: 0018:ffffc90019b5fee8 EFLAGS: 00000216
RAX: 32bddfb7404d7600 RBX: ffffc90019b5fef0 RCX: 32bddfb7404d7600
RDX: 0000000000000000 RSI: 0000000000000037 RDI: ffffc90019b5ff58
RBP: ffffc90019b5ff48 R08: ffffffff8fa18cf7 R09: 1ffffffff1f4319e
R10: dffffc0000000000 R11: fffffbfff1f4319f R12: 0000000000000037
R13: 0000000000000037 R14: ffffc90019b5ff58 R15: ffff888058915a00
 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: 0033:0x7fc78199066a
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffc28572d18 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffc28572da0 RCX: 00007fc78199066a
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffc28572d3c R09: 0079746972756365
R10: 00007ffc28572da0 R11: 0000000000000212 R12: 00007fc781b81780
R13: 00007ffc28572d3c R14: 0000000000000000 R15: 00007fc781b81e40
 </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: 0018:ffffc90000a08b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888058915a00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88805853ac70
RBP: 0000000000000001 R08: ffff88805853ac03 R09: 1ffff1100b0a7580
R10: dffffc0000000000 R11: ffffed100b0a7581 R12: 1ffff1100b0a758d
R13: ffffffff81a83684 R14: ffff88805853ac68 R15: dffffc0000000000
FS:  000055556d528500(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 0000000077a9a000 CR4: 00000000003526f0
----------------
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