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BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x420/0x580 include/trace/events/lock.h:13
Read of size 8 at addr ffff88809b71bc98 by task syz-executor.0/20129

CPU: 0 PID: 20129 Comm: syz-executor.0 Not tainted 5.0.0-rc6-next-20190215 #36
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 perf_trace_lock_acquire+0x420/0x580 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x29c/0x3f0 kernel/locking/lockdep.c:3832
 __mutex_lock_common kernel/locking/mutex.c:925 [inline]
 __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 seccomp_notify_release+0x62/0x280 kernel/seccomp.c:982
 __fput+0x2e5/0x8d0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x14a/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x90a/0x2fa0 kernel/exit.c:876
 do_group_exit+0x135/0x370 kernel/exit.c:980
 __do_sys_exit_group kernel/exit.c:991 [inline]
 __se_sys_exit_group kernel/exit.c:989 [inline]
 __x64_sys_exit_group+0x44/0x50 kernel/exit.c:989
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e29
Code: Bad RIP value.
RSP: 002b:00007ffc925cdf88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000000457e29
RDX: 0000001b2f220000 RSI: 00007ffc925cdfc0 RDI: 0000000000000007
RBP: 000000000000015b R08: 00000000863ec701 R09: 000000000000000a
R10: 00000000863ec6fd R11: 0000000000000246 R12: 000000000073bf88
R13: 0000000080000000 R14: 00007efe686fa008 R15: 0000000000001fff

Allocated by task 20133:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_kmalloc mm/kasan/common.c:497 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511
 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615
 kmalloc include/linux/slab.h:548 [inline]
 kzalloc include/linux/slab.h:743 [inline]
 seccomp_prepare_filter kernel/seccomp.c:451 [inline]
 seccomp_prepare_user_filter kernel/seccomp.c:491 [inline]
 seccomp_set_mode_filter kernel/seccomp.c:1260 [inline]
 do_seccomp+0x743/0x2250 kernel/seccomp.c:1374
 __do_sys_seccomp kernel/seccomp.c:1393 [inline]
 __se_sys_seccomp kernel/seccomp.c:1390 [inline]
 __x64_sys_seccomp+0x73/0xb0 kernel/seccomp.c:1390
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 20133:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
 __cache_free mm/slab.c:3491 [inline]
 kfree+0xcf/0x230 mm/slab.c:3816
 seccomp_filter_free kernel/seccomp.c:565 [inline]
 seccomp_filter_free kernel/seccomp.c:561 [inline]
 seccomp_set_mode_filter kernel/seccomp.c:1315 [inline]
 do_seccomp+0xb00/0x2250 kernel/seccomp.c:1374
 __do_sys_seccomp kernel/seccomp.c:1393 [inline]
 __se_sys_seccomp kernel/seccomp.c:1390 [inline]
 __x64_sys_seccomp+0x73/0xb0 kernel/seccomp.c:1390
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809b71bc00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 152 bytes inside of
 192-byte region [ffff88809b71bc00, ffff88809b71bcc0)
The buggy address belongs to the page:
page:ffffea00026dc6c0 count:1 mapcount:0 mapping:ffff88812c3f0040 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002235b08 ffffea000037d9c8 ffff88812c3f0040
raw: 0000000000000000 ffff88809b71b000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809b71bb80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
 ffff88809b71bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809b71bc80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                            ^
 ffff88809b71bd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809b71bd80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
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