Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 17058 Comm: syz.8.2506 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:ffffc90000007b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888032493c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88802f4b70f0
RBP: 0000000000000001 R08: ffff88802f4b7083 R09: 1ffff11005e96e10
R10: dffffc0000000000 R11: ffffed1005e96e11 R12: 1ffff11005e96e1d
R13: ffffffff81a83684 R14: ffff88802f4b70e8 R15: dffffc0000000000
FS: 00007f550000c6c0(0000) GS:ffff888125c25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab0ba23fd7 CR3: 000000007e6d4000 CR4: 00000000003526f0
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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 7b 5a 57 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f3 47 20 f6 65 8b 05 0c ab 2f 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900049bf1e0 EFLAGS: 00000206
RAX: f9cdda22e6476d00 RBX: 0000000000000246 RCX: f9cdda22e6476d00
RDX: 0000000000000000 RSI: ffffffff8d991910 RDI: 0000000000000001
RBP: ffffc900049bf270 R08: ffffffff8fa18cf7 R09: 1ffffffff1f4319e
R10: dffffc0000000000 R11: fffffbfff1f4319f R12: dffffc0000000000
R13: ffffffff8e143280 R14: ffffffff8e143240 R15: 1ffff92000937e3c
rcu_preempt_deferred_qs_irqrestore+0x84b/0xc40 kernel/rcu/tree_plugin.h:-1
rcu_read_unlock_special+0x40b/0x4d0 kernel/rcu/tree_plugin.h:703
__rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438
rcu_read_unlock include/linux/rcupdate.h:873 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_node_noprof+0x276/0x4e0 mm/slub.c:4371
kmalloc_array_node_noprof include/linux/slab.h:1020 [inline]
alloc_slab_obj_exts mm/slub.c:2028 [inline]
account_slab mm/slub.c:2614 [inline]
allocate_slab+0x16a/0x370 mm/slub.c:2674
new_slab mm/slub.c:2709 [inline]
___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kvmalloc_node_noprof+0x429/0x5f0 mm/slub.c:5052
kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline]
io_region_allocate_pages+0x5f/0x4b0 io_uring/memmap.c:164
io_create_region+0x374/0x480 io_uring/memmap.c:224
io_allocate_scq_urings+0x4e9/0x7f0 io_uring/io_uring.c:3559
io_uring_create+0x52b/0xb60 io_uring/io_uring.c:3765
io_uring_setup io_uring/io_uring.c:3855 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3889 [inline]
__se_sys_io_uring_setup+0x264/0x270 io_uring/io_uring.c:3880
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: 0033:0x7f54ff18e929
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:00007f550000c038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007f54ff3b6080 RCX: 00007f54ff18e929
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000006ed0
RBP: 00007f54ff210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f54ff3b6080 R15: 00007ffc87c9f948
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:ffffc90000007b90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888032493c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88802f4b70f0
RBP: 0000000000000001 R08: ffff88802f4b7083 R09: 1ffff11005e96e10
R10: dffffc0000000000 R11: ffffed1005e96e11 R12: 1ffff11005e96e1d
R13: ffffffff81a83684 R14: ffff88802f4b70e8 R15: dffffc0000000000
FS: 00007f550000c6c0(0000) GS:ffff888125c25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab0ba23fd7 CR3: 000000007e6d4000 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