Update report

report

+[   22.488669] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1403/0x19e0
+[   22.488750] Read of size 8 at addr ffff888063c6fd18 by task syz-executor.0/2912
+[   22.488750] 
+[   22.488750] CPU: 0 PID: 2912 Comm: syz-executor.0 Not tainted 4.20.17 #1
+[   22.488750] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
+[   22.488750] Call Trace:
+[   22.488750]  dump_stack+0xca/0x13e
+[   22.488750]  ? unwind_next_frame+0x1403/0x19e0
+[   22.488750]  print_address_description+0x67/0x237
+[   22.488750]  ? unwind_next_frame+0x1403/0x19e0
+[   22.488750]  kasan_report.cold.6+0x241/0x301
+[   22.488750]  unwind_next_frame+0x1403/0x19e0
+[   22.488750]  ? retint_kernel+0x10/0x10
+[   22.488750]  ? deref_stack_reg+0xe0/0xe0
+[   22.488750]  ? retint_kernel+0x10/0x10
+[   22.488750]  perf_callchain_kernel+0x400/0x5b0
+[   22.488750]  ? arch_perf_update_userpage+0x370/0x370
+[   22.488750]  ? put_callchain_buffers+0x70/0x70
+[   22.488750]  get_perf_callchain+0x370/0x800
+[   22.488750]  ? put_callchain_buffers+0x70/0x70
+[   22.488750]  ? perf_callchain+0x171/0x1c0
+[   22.488750]  perf_callchain+0x163/0x1c0
+[   22.488750]  perf_prepare_sample+0x88d/0x15a0
+[   22.488750]  ? perf_callchain+0x1c0/0x1c0
+[   22.488750]  ? perf_prepare_sample+0x15a0/0x15a0
+[   22.488750]  ? perf_event_output_forward+0x1bf/0x2a0
+[   22.488750]  perf_event_output_forward+0x108/0x2a0
+[   22.488750]  ? perf_prepare_sample+0x15a0/0x15a0
+[   22.488750]  ? __perf_event_overflow+0x1e7/0x360
+[   22.488750]  ? perf_swevent_overflow+0x8d/0x140
+[   22.488750]  __perf_event_overflow+0x13f/0x360
+[   22.488750]  perf_swevent_overflow+0xa7/0x140
+[   22.488750]  perf_swevent_event+0x14d/0x2e0
+[   22.488750]  perf_tp_event+0x26a/0x880
+[   22.488750]  ? perf_swevent_event+0x2e0/0x2e0
+[   22.488750]  ? perf_pmu_nop_int+0x5/0x10
+[   22.488750]  ? group_sched_in+0x177/0x3f0
+[   22.488750]  ? flexible_sched_in+0xbc/0x5f0
+[   22.488750]  ? __lock_acquire+0x5d6/0x4630
+[   22.488750]  ? perf_trace_run_bpf_submit+0x112/0x1b0
+[   22.488750]  ? perf_trace_run_bpf_submit+0x112/0x1b0
+[   22.488750]  perf_trace_run_bpf_submit+0x112/0x1b0
+[   22.488750]  ? memset+0x1f/0x40
+[   22.488750]  perf_trace_lock_acquire+0x374/0x630
+[   22.488750]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[   22.488750]  ? perf_trace_lock+0x520/0x520
+[   22.488750]  ? retint_kernel+0x10/0x10
+[   22.488750]  lock_acquire+0x1ed/0x2e0
+[   22.488750]  ? posix_ktime_get_ts+0x11/0x20
+[   22.488750]  ktime_get_ts64+0x187/0x2e0
+[   22.488750]  ? posix_ktime_get_ts+0x11/0x20
+[   22.488750]  ? __x64_sys_futex+0x361/0x4d8
+[   22.488750]  posix_ktime_get_ts+0x11/0x20
+[   22.488750]  __x64_sys_clock_gettime+0x152/0x240
+[   22.488750]  ? __x64_sys_timer_create+0x1b0/0x1b0
+[   22.488750]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[   22.488750]  ? trace_hardirqs_off_caller+0x55/0x1c0
+[   22.488750]  ? do_syscall_64+0x1a/0x4e0
+[   22.488750]  do_syscall_64+0xbc/0x4e0
+[   22.488750]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[   22.488750] RIP: 0033:0x45b37a
+[   22.488750] Code: 31 f6 31 ff e8 27 fe ff ff b8 40 6b a4 00 48 83 c4 08 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 f3 c3 48 c7 c2 d4 ff ff ff f7 d8 64 89 02
+[   22.488750] RSP: 002b:00007f7fdc56fc78 EFLAGS: 00000202 ORIG_RAX: 00000000000000e4
+[   22.488750] RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045b37a
+[   22.488750] RDX: 00000000004b587f RSI: 00007f7fdc56fc80 RDI: 0000000000000001
+[   22.488750] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f7fdc570700
+[   22.488750] R10: 0000000000000003 R11: 0000000000000202 R12: 00000000004b587f
+[   22.488750] R13: 00000000004c9050 R14: 00007f7fdc5709c0 R15: 00007f7fdc570700
+[   22.488750] 
+[   22.488750] The buggy address belongs to the page:
+[   22.488750] page:ffffea00018f1bc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
+[   22.488750] flags: 0x100000000000000()
+[   22.488750] raw: 0100000000000000 0000000000000000 ffffea00018f1bc8 0000000000000000
+[   22.488750] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
+[   22.488750] page dumped because: kasan: bad access detected
+[   22.488750] 
+[   22.488750] Memory state around the buggy address:
+[   22.488750]  ffff888063c6fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[   22.488750]  ffff888063c6fc80: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04
+[   22.488750] >ffff888063c6fd00: f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00
+[   22.488750]                             ^
+[   22.488750]  ffff888063c6fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[   22.488750]  ffff888063c6fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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