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: 9908 Comm: syz.4.1058 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: ffff88802d60da00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880516c36f0
RBP: 0000000000000001 R08: ffff8880516c3683 R09: 1ffff1100a2d86d0
R10: dffffc0000000000 R11: ffffed100a2d86d1 R12: 1ffff1100a2d86dd
R13: ffffffff81a83684 R14: ffff8880516c36e8 R15: dffffc0000000000
FS: 00007fe31a5646c0(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001be000 CR3: 00000000530c2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:208 [inline]
RIP: 0010:perf_sw_event include/linux/perf_event.h:1595 [inline]
RIP: 0010:do_user_addr_fault+0x1ae/0x1390 arch/x86/mm/fault.c:1283
Code: 1b 48 89 de 48 81 e6 00 02 00 00 31 ff e8 fa 2f 4c 00 48 81 e3 00 02 00 00 0f 84 79 0e 00 00 e8 98 bd 53 00 fb 4c 89 7c 24 38 <0f> 1f 44 00 00 e8 f8 2a 4c 00 44 89 f6 83 e6 40 31 ff 48 89 74 24
RSP: 0018:ffffc9000d7e7ae8 EFLAGS: 00000282
RAX: 5cadce53cced0100 RBX: 0000000000000200 RCX: 5cadce53cced0100
RDX: 0000000000000000 RSI: ffffffff8d991910 RDI: ffffffff8be322c0
RBP: dffffc0000000000 R08: ffffffff8fa18cf7 R09: 1ffffffff1f4319e
R10: dffffc0000000000 R11: fffffbfff1f4319f R12: ffffc9000d7e7bd8
R13: 00002000001be000 R14: 0000000000000000 R15: ffff88802d60da00
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: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74
Code: ff 03 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48
RSP: 0018:ffffc9000d7e7c80 EFLAGS: 00050202
RAX: 00007ffffffff001 RBX: 00000000001fefe4 RCX: 00000000000425e4
RDX: 0000000000000001 RSI: 00002000001be000 RDI: ffff88803c1bca00
RBP: 0000200000001600 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffed100783fdfc R12: ffff888059542000
R13: 0000000000000000 R14: ffff88803c000000 R15: 0000200000001600
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x7a/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
vmemdup_user+0x59/0xd0 mm/util.c:250
__bpf_copy_key kernel/bpf/syscall.c:1631 [inline]
map_lookup_and_delete_elem+0x33a/0x870 kernel/bpf/syscall.c:2134
__sys_bpf+0x4ca/0x860 kernel/bpf/syscall.c:6032
__do_sys_bpf kernel/bpf/syscall.c:6085 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6083 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6083
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: 0033:0x7fe31978e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe31a564038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fe3199b5fa0 RCX: 00007fe31978e929
RDX: 0000000000000020 RSI: 0000200000000580 RDI: 0000000000000015
RBP: 00007fe319810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe3199b5fa0 R15: 00007ffe8719ca48
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: ffff88802d60da00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880516c36f0
RBP: 0000000000000001 R08: ffff8880516c3683 R09: 1ffff1100a2d86d0
R10: dffffc0000000000 R11: ffffed100a2d86d1 R12: 1ffff1100a2d86dd
R13: ffffffff81a83684 R14: ffff8880516c36e8 R15: dffffc0000000000
FS: 00007fe31a5646c0(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001be000 CR3: 00000000530c2000 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