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BUG: KASAN: use-after-free in get_kprobe+0xa1/0xc0 kernel/kprobes.c:372
Read of size 8 at addr ffff88800b581228 by task syz-executor.4/6860

CPU: 0 PID: 6860 Comm: syz-executor.4 Not tainted 5.10.79 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0+0x1c/0x210 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x37/0x7c mm/kasan/report.c:562
 get_kprobe+0xa1/0xc0 kernel/kprobes.c:372
 __recover_optprobed_insn+0x31/0x220 arch/x86/kernel/kprobes/opt.c:44
 recover_probed_instruction+0x1c/0xf0 arch/x86/kernel/kprobes/core.c:275
 can_optimize+0x231/0x400 arch/x86/kernel/kprobes/opt.c:321
 arch_prepare_optimized_kprobe+0x3e/0x5f0 arch/x86/kernel/kprobes/opt.c:406
 __prepare_optimized_kprobe kernel/kprobes.c:805 [inline]
 alloc_aggr_kprobe+0x140/0x190 kernel/kprobes.c:828
 try_to_optimize_kprobe kernel/kprobes.c:853 [inline]
 register_kprobe kernel/kprobes.c:1740 [inline]
 register_kprobe+0xb78/0x1330 kernel/kprobes.c:1682
 __register_trace_kprobe kernel/trace/trace_kprobe.c:514 [inline]
 __register_trace_kprobe+0x262/0x2d0 kernel/trace/trace_kprobe.c:482
 create_local_trace_kprobe+0x1e6/0x3b0 kernel/trace/trace_kprobe.c:1837
 perf_kprobe_init+0x18c/0x280 kernel/trace/trace_event_perf.c:272
 perf_kprobe_event_init+0xf8/0x1c0 kernel/events/core.c:9621
 perf_try_init_event+0x130/0x570 kernel/events/core.c:10999
 perf_init_event kernel/events/core.c:11051 [inline]
 perf_event_alloc.part.0+0xd96/0x2b30 kernel/events/core.c:11329
 perf_event_alloc kernel/events/core.c:11708 [inline]
 __do_sys_perf_event_open+0x57c/0x2d00 kernel/events/core.c:11806
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f2ace855b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2acbdcb188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f2ace968f60 RCX: 00007f2ace855b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001d80
RBP: 00007f2ace8aff6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcfce1406f R14: 00007f2acbdcb300 R15: 0000000000022000

Allocated by task 6575:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
 kmalloc_node include/linux/slab.h:570 [inline]
 kzalloc_node include/linux/slab.h:675 [inline]
 create_io_worker+0x84/0x7e0 fs/io-wq.c:689
 io_wq_manager+0x15c/0xb80 fs/io-wq.c:786
 kthread+0x38f/0x470 kernel/kthread.c:313
 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296

The buggy address belongs to the object at ffff88800b581200
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 40 bytes inside of
 192-byte region [ffff88800b581200, ffff88800b5812c0)
The buggy address belongs to the page:
page:000000009f623c9d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b581500 pfn:0xb581
flags: 0x100000000000200(slab)
raw: 0100000000000200 ffffea00011152c8 ffffea00005f79c8 ffff888007c41500
raw: ffff88800b581500 000000000010000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88800b581100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88800b581180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
>ffff88800b581200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88800b581280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88800b581300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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