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BUG: KASAN: use-after-free in user_mode arch/x86/include/asm/ptrace.h:131 [inline]
BUG: KASAN: use-after-free in trace_page_fault_entries arch/x86/mm/fault.c:1516 [inline]
BUG: KASAN: use-after-free in do_page_fault+0x66/0x330 arch/x86/mm/fault.c:1528
Read of size 8 at addr ffff8881c6ddff00 by task syz.2.536/2555

CPU: 1 PID: 2555 Comm: syz.2.536 Not tainted 5.4.289-syzkaller-00011-g39762b7a60e9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:

The buggy address belongs to the page:
page:ffffea00071b77c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffea00071b7788 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 __slab_alloc+0x62/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 __kmalloc+0x19b/0x2e0 mm/slub.c:3909
 __kmalloc_node include/linux/slab.h:422 [inline]
 kmalloc_node include/linux/slab.h:599 [inline]
 kvmalloc_node+0x7e/0xf0 mm/util.c:596
 kvmalloc include/linux/mm.h:761 [inline]
 kvmalloc_array include/linux/mm.h:779 [inline]
 __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:470 [inline]
 ptr_ring_init include/linux/ptr_ring.h:488 [inline]
 skb_array_init include/linux/skb_array.h:182 [inline]
 pfifo_fast_init+0x109/0x760 net/sched/sch_generic.c:784
 qdisc_create_dflt+0x129/0x250 net/sched/sch_generic.c:944
 mq_init+0x2c8/0x6b0 net/sched/sch_mq.c:90
 qdisc_create_dflt+0x129/0x250 net/sched/sch_generic.c:944
 attach_default_qdiscs net/sched/sch_generic.c:1113 [inline]
 dev_activate+0x11f/0xc00 net/sched/sch_generic.c:1154
 __dev_open+0x302/0x420 net/core/dev.c:1335
 __dev_change_flags+0x1db/0x6e0 net/core/dev.c:7958
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4955 [inline]
 __free_pages+0x91/0x140 mm/page_alloc.c:4961
 __free_slab+0x221/0x2e0 mm/slub.c:1774
 free_slab mm/slub.c:1789 [inline]
 discard_slab mm/slub.c:1795 [inline]
 unfreeze_partials+0x14e/0x180 mm/slub.c:2288
 put_cpu_partial+0x44/0x180 mm/slub.c:2324
 __slab_free+0x297/0x360 mm/slub.c:2971
 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167
 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260
 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 __kmalloc+0x105/0x2e0 mm/slub.c:3909
 kmalloc include/linux/slab.h:561 [inline]
 allocate_probes kernel/tracepoint.c:64 [inline]
 func_add kernel/tracepoint.c:162 [inline]
 tracepoint_add_func+0x30c/0x710 kernel/tracepoint.c:288
 tracepoint_probe_register_prio kernel/tracepoint.c:390 [inline]
 tracepoint_probe_register+0xff/0x160 kernel/tracepoint.c:410
 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline]
 perf_trace_event_init+0x494/0x920 kernel/trace/trace_event_perf.c:204
 perf_trace_init+0x1bd/0x200 kernel/trace/trace_event_perf.c:228
 perf_tp_event_init+0x89/0x110 kernel/events/core.c:8904
 perf_try_init_event+0x130/0x3e0 kernel/events/core.c:10357

Memory state around the buggy address:
 ffff8881c6ddfe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c6ddfe80: 00 00 00 00 00 00 00 00 ff ff ff ff ff ff ff ff
>ffff8881c6ddff00: ff ff ff ff ff ff ff ff ff ff ff ff f1 f1 f1 f1
                   ^
 ffff8881c6ddff80: 00 f2 f2 f2 04 f3 f3 f3 ff ff ff ff ff ff ff ff
 ffff8881c6de0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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