syzbot

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 4.15.0-rc8+ #263
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events bpf_map_free_deferred
RIP: 0010:__bpf_map_put+0x64/0x2e0 kernel/bpf/syscall.c:233
RSP: 0018:ffff8801d9fbf458 EFLAGS: 00010293
RAX: ffff8801d9fb0480 RBX: e66001ca00000ec6 RCX: ffffffff817db0d4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: e66001ca00000ec6
RBP: ffff8801d9fbf4e8 R08: 1ffff1003b3f7e6a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003b3f7e8c
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000204f9fe4 CR3: 0000000006822004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bpf_map_put+0x1a/0x20 kernel/bpf/syscall.c:243
 bpf_map_fd_put_ptr+0x15/0x20 kernel/bpf/map_in_map.c:96
 fd_array_map_delete_elem kernel/bpf/arraymap.c:420 [inline]
 bpf_fd_array_map_clear kernel/bpf/arraymap.c:461 [inline]
 array_of_map_free+0x100/0x180 kernel/bpf/arraymap.c:618
 bpf_map_free_deferred+0xb0/0xe0 kernel/bpf/syscall.c:217
 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x37/0x50 arch/x86/entry/entry_64.S:530
Code: b5 41 48 c7 45 80 95 d4 58 86 48 c7 45 88 70 b0 7d 81 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 ec 66 f2 ff <f0> ff 4b 48 74 2f e8 e1 66 f2 ff 48 b8 00 00 00 00 00 fc ff df 
RIP: __bpf_map_put+0x64/0x2e0 kernel/bpf/syscall.c:233 RSP: ffff8801d9fbf458
---[ end trace 6c10653fdfd94c8b ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..