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: 7379 Comm: syz.1.341 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
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: ffff888025079e00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880732c8c70
RBP: 0000000000000001 R08: ffff8880732c8c03 R09: 1ffff1100e659180
R10: dffffc0000000000 R11: ffffed100e659181 R12: 1ffff1100e65918d
R13: ffffffff81a8bfb4 R14: ffff8880732c8c68 R15: dffffc0000000000
FS: 00007f5d3ba396c0(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5d3ba38f98 CR3: 0000000033e2c000 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+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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:206 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:238 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:folio_test_swapbacked include/linux/page-flags.h:574 [inline]
RIP: 0010:mm_counter_file include/linux/mm.h:2621 [inline]
RIP: 0010:copy_present_ptes mm/memory.c:1070 [inline]
RIP: 0010:copy_pte_range mm/memory.c:1197 [inline]
RIP: 0010:copy_pmd_range+0x11ce/0x7000 mm/memory.c:1285
Code: e6 01 31 ff e8 e3 6d b3 ff 48 83 e3 01 0f 85 cb 5a 00 00 e8 f4 68 b3 ff 4c 89 ff be 08 00 00 00 e8 37 96 17 00 48 8b 44 24 28 <42> 80 3c 20 00 74 08 4c 89 ff e8 b3 93 17 00 49 8b 37 48 89 f3 48
RSP: 0018:ffffc9000bbe73c0 EFLAGS: 00000256
RAX: 1ffffd40002e9b28 RBX: 0000000000000000 RCX: ffffffff820ceff9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea000174d940
RBP: ffffc9000bbe7630 R08: ffffea000174d947 R09: 1ffffd40002e9b28
R10: dffffc0000000000 R11: fffff940002e9b29 R12: dffffc0000000000
R13: ffff8880275c67a0 R14: ffffea000174d948 R15: ffffea000174d940
copy_pud_range mm/memory.c:1322 [inline]
copy_p4d_range mm/memory.c:1346 [inline]
copy_page_range+0xc46/0x1270 mm/memory.c:1434
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1838
dup_mm kernel/fork.c:1476 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1528
copy_process+0x1706/0x3c00 kernel/fork.c:2168
kernel_clone+0x21e/0x870 kernel/fork.c:2598
__do_sys_clone kernel/fork.c:2741 [inline]
__se_sys_clone kernel/fork.c:2725 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2725
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: 0033:0x7f5d3ab8e929
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:00007f5d3ba38fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f5d3adb5fa0 RCX: 00007f5d3ab8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000060000400
RBP: 00007f5d3ac10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5d3adb5fa0 R15: 00007ffe1519ad48
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: ffff888025079e00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880732c8c70
RBP: 0000000000000001 R08: ffff8880732c8c03 R09: 1ffff1100e659180
R10: dffffc0000000000 R11: ffffed100e659181 R12: 1ffff1100e65918d
R13: ffffffff81a8bfb4 R14: ffff8880732c8c68 R15: dffffc0000000000
FS: 00007f5d3ba396c0(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5d3ba38f98 CR3: 0000000033e2c000 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