BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 13a92067 P4D 13a92067 PUD 2642e067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 19703 Comm: syz-executor.0 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kasan_record_aux_stack+0x77/0xb0 mm/kasan/generic.c:341
Code: 48 f7 fe 8b 47 24 49 89 f0 48 29 d3 8d 70 ff 41 0f af f0 48 01 ce 48 39 f3 48 0f 46 f3 e8 81 e9 ff ff bf 00 08 00 00 48 89 c3 <8b> 40 08 89 43 0c e8 1e e6 ff ff 89 43 08 5b c3 48 8b 50 08 48 c7
RSP: 0018:ffffc9000bb7fc20 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888090000000
RDX: 0000000000000010 RSI: ffff888090000000 RDI: 0000000000000800
RBP: ffffffff8185fc10 R08: 0000000000400000 R09: ffffffff8f13fa23
R10: ffffffff8132a9c0 R11: 0000000000000000 R12: 0000000000035b40
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f34da497700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000001e147000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __call_rcu kernel/rcu/tree.c:2965 [inline]
 call_rcu+0xbb/0x700 kernel/rcu/tree.c:3038
 free_htab_elem kernel/bpf/hashtab.c:822 [inline]
 free_htab_elem+0x174/0x1c0 kernel/bpf/hashtab.c:813
 htab_map_update_elem+0x61c/0x790 kernel/bpf/hashtab.c:1061
 bpf_map_update_value.isra.0+0x6df/0x8d0 kernel/bpf/syscall.c:202
 map_update_elem kernel/bpf/syscall.c:1125 [inline]
 __do_sys_bpf+0x2d4d/0x4f10 kernel/bpf/syscall.c:4369
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e299
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f34da496c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e299
RDX: 0000000000000020 RSI: 0000000020000000 RDI: 0000000000000002
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffeac47dedf R14: 00007f34da4979c0 R15: 000000000119bf8c
Modules linked in:
CR2: 0000000000000008
---[ end trace c2a7b97309a4e852 ]---
RIP: 0010:kasan_record_aux_stack+0x77/0xb0 mm/kasan/generic.c:341
Code: 48 f7 fe 8b 47 24 49 89 f0 48 29 d3 8d 70 ff 41 0f af f0 48 01 ce 48 39 f3 48 0f 46 f3 e8 81 e9 ff ff bf 00 08 00 00 48 89 c3 <8b> 40 08 89 43 0c e8 1e e6 ff ff 89 43 08 5b c3 48 8b 50 08 48 c7
RSP: 0018:ffffc9000bb7fc20 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888090000000
RDX: 0000000000000010 RSI: ffff888090000000 RDI: 0000000000000800
RBP: ffffffff8185fc10 R08: 0000000000400000 R09: ffffffff8f13fa23
R10: ffffffff8132a9c0 R11: 0000000000000000 R12: 0000000000035b40
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f34da497700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000001e147000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600