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BUG: KASAN: use-after-free in atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline]
BUG: KASAN: use-after-free in put_task_struct include/linux/sched/task.h:95 [inline]
BUG: KASAN: use-after-free in _free_event+0x49a/0x1610 kernel/events/core.c:4452
Write of size 4 at addr ffff8801cbb4a120 by task syz-executor0/12749

CPU: 0 PID: 12749 Comm: syz-executor0 Not tainted 4.19.0-rc8+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
 atomic_dec_and_test include/asm-generic/atomic-instrumented.h:259 [inline]
 put_task_struct include/linux/sched/task.h:95 [inline]
 _free_event+0x49a/0x1610 kernel/events/core.c:4452
 free_event+0xb4/0x180 kernel/events/core.c:4473
 perf_event_release_kernel+0x7d8/0xfa0 kernel/events/core.c:4634
 perf_release+0x37/0x50 kernel/events/core.c:4648
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1ad7/0x2610 kernel/exit.c:867
 do_group_exit+0x177/0x440 kernel/exit.c:970
 get_signal+0x8b0/0x1980 kernel/signal.c:2513
 do_signal+0x9c/0x21e0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode+0x342/0x3b0 arch/x86/entry/common.c:197
 retint_user+0x8/0x18
RIP: 0033:          (null)
Code: Bad RIP value.
RSP: 002b:0000000020000208 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000457569
RDX: 0000000020000000 RSI: 0000000020000200 RDI: 0000000000000000
RBP: 000000000072bf00 R08: 0000000020000140 R09: 0000000000000000
R10: 0000000020000100 R11: 0000000000000246 R12: 00007fed8a2676d4
R13: 00000000004bd9e6 R14: 00000000004cc448 R15: 00000000ffffffff

Allocated by task 12748:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc_node+0x144/0x730 mm/slab.c:3644
 alloc_task_struct_node kernel/fork.c:157 [inline]
 dup_task_struct kernel/fork.c:802 [inline]
 copy_process+0x1ff4/0x8780 kernel/fork.c:1707
 _do_fork+0x1cb/0x11d0 kernel/fork.c:2166
 __do_sys_clone kernel/fork.c:2273 [inline]
 __se_sys_clone kernel/fork.c:2267 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2267
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 12748:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x83/0x290 mm/slab.c:3756
 free_task_struct kernel/fork.c:162 [inline]
 free_task+0x16e/0x1f0 kernel/fork.c:416
 copy_process+0x1d9a/0x8780 kernel/fork.c:2098
 _do_fork+0x1cb/0x11d0 kernel/fork.c:2166
 __do_sys_clone kernel/fork.c:2273 [inline]
 __se_sys_clone kernel/fork.c:2267 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2267
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801cbb4a100
 which belongs to the cache task_struct(17:syz0) of size 6080
The buggy address is located 32 bytes inside of
 6080-byte region [ffff8801cbb4a100, ffff8801cbb4b8c0)
The buggy address belongs to the page:
page:ffffea00072ed280 count:1 mapcount:0 mapping:ffff8801bb427b40 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea00071f1688 ffffea0006279908 ffff8801bb427b40
raw: 0000000000000000 ffff8801cbb4a100 0000000100000001 ffff88018caa8780
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88018caa8780

Memory state around the buggy address:
 ffff8801cbb4a000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801cbb4a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801cbb4a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff8801cbb4a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cbb4a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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device team0 left promiscuous mode
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