kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 20806 Comm: syz-executor2 Not tainted 4.9.111-g03c70fe #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d82f8000 task.stack: ffff8801a1fb8000
RIP: 0010:[<ffffffff813fd5bd>]  [<ffffffff813fd5bd>] perf_event_count kernel/events/core.c:3583 [inline]
RIP: 0010:[<ffffffff813fd5bd>]  [<ffffffff813fd5bd>] perf_output_read_group kernel/events/core.c:5725 [inline]
RIP: 0010:[<ffffffff813fd5bd>]  [<ffffffff813fd5bd>] perf_output_read+0x62d/0x12e0 kernel/events/core.c:5762
RSP: 0018:ffff8801a1fbeff0  EFLAGS: 00010207
RAX: 000000000000001b RBX: 0000000000000004 RCX: ffffc90004be9000
RDX: 0000000000040000 RSI: ffffffff813fd5af RDI: 00000000000000dc
RBP: ffff8801a1fbf150 R08: ffffed0038800c91 R09: ffffed0038800c90
R10: ffffed0038800c90 R11: ffff8801c4006487 R12: ffff8801a8644148
R13: ffff8801a1fbf318 R14: dffffc0000000000 R15: ffff8801a86440d0
FS:  00007f85b9bda700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000001 CR3: 00000001c2ec9000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 00000000200001c0
DR3: 00000000200001c0 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801a864429c 00000000000084f8 ffff8801a1fbf320 ffffed00343f7e64
 0000000000000008 0000000000000000 ffff8801c5336e80 ffffed00343f7e67
 1ffff100343f7e0d ffff8801c5333320 ffff8801a1fbf338 ffff8801a1fbf330
Call Trace:
 [<ffffffff8141406b>] perf_output_sample+0xedb/0x1770 kernel/events/core.c:5804
 [<ffffffff81415966>] __perf_event_output kernel/events/core.c:6076 [inline]
 [<ffffffff81415966>] perf_event_output_forward+0x126/0x230 kernel/events/core.c:6089
 [<ffffffff813f7caf>] __perf_event_overflow+0x11f/0x320 kernel/events/core.c:7189
 [<ffffffff813f8011>] perf_swevent_overflow+0x161/0x1f0 kernel/events/core.c:7265
 [<ffffffff813f81b5>] perf_swevent_event+0x115/0x270 kernel/events/core.c:7303
 [<ffffffff81417994>] perf_tp_event+0x234/0x660 kernel/events/core.c:7724
 [<ffffffff81417eac>] perf_trace_run_bpf_submit+0xec/0x140 kernel/events/core.c:7698
 [<ffffffff81646244>] perf_trace_android_fs_data_end_template+0x2f4/0x4a0 include/trace/events/android_fs_template.h:44
 [<ffffffff8175c6a9>] trace_android_fs_datawrite_end include/trace/events/android_fs.h:24 [inline]
 [<ffffffff8175c6a9>] ext4_da_write_end+0x7a9/0xbf0 fs/ext4/inode.c:3068
 [<ffffffff81435e19>] generic_perform_write+0x3b9/0x510 mm/filemap.c:2751
 [<ffffffff8143d7f2>] __generic_file_write_iter+0x352/0x540 mm/filemap.c:2865
 [<ffffffff8172cf93>] ext4_file_write_iter+0x463/0xd90 fs/ext4/file.c:165
 [<ffffffff8156ec30>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156ec30>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572a27>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81576859>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576859>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f8cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 74 08 3c 03 0f 8e 52 0a 00 00 41 83 bf 88 00 00 00 01 0f 84 14 07 00 00 e8 61 14 f6 ff 48 8d bb d8 00 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 12 0a 00 00 48 8b 9b d8 00 00 00 48 85 db 
RIP  [<ffffffff813fd5bd>] perf_event_count kernel/events/core.c:3583 [inline]
RIP  [<ffffffff813fd5bd>] perf_output_read_group kernel/events/core.c:5725 [inline]
RIP  [<ffffffff813fd5bd>] perf_output_read+0x62d/0x12e0 kernel/events/core.c:5762
 RSP <ffff8801a1fbeff0>
---[ end trace 09108cfe436b38a7 ]---