BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 29226067 P4D 29226067 PUD 12ea3067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 21880 Comm: syz-executor.1 Not tainted 5.10.0-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:ffffc90006857c20 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88808a400000 RDX: 0000000000000010 RSI: ffff88808a400000 RDI: 0000000000000800 RBP: ffffffff818701f0 R08: 0000000000400000 R09: 000000000000002e R10: ffffffff8132b7ea R11: 000000000000003f R12: 0000000000035b40 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f62cfd4a700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000083400000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xbb/0x710 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+0x770/0x980 kernel/bpf/syscall.c:202 map_update_elem kernel/bpf/syscall.c:1125 [inline] __do_sys_bpf+0x2dea/0x50f0 kernel/bpf/syscall.c:4369 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e149 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:00007f62cfd49c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e149 RDX: 0000000000000020 RSI: 0000000020000000 RDI: 0000000000000002 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffdec0a558f R14: 00007f62cfd4a9c0 R15: 000000000119bf8c Modules linked in: CR2: 0000000000000008 ---[ end trace 924dd88a2c7d4393 ]--- 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:ffffc90006857c20 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88808a400000 RDX: 0000000000000010 RSI: ffff88808a400000 RDI: 0000000000000800 RBP: ffffffff818701f0 R08: 0000000000400000 R09: 000000000000002e R10: ffffffff8132b7ea R11: 000000000000003f R12: 0000000000035b40 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f62cfd4a700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000083400000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400