BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 92cae067 P4D 92cae067 PUD 91127067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8370 Comm: syz-executor.5 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:252 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x60 kernel/kcov.c:202 Code: c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 04 14 00 00 00 74 2c 8b 91 e0 13 00 00 83 fa 02 75 21 48 8b 91 e8 13 00 00 <48> 8b 32 48 8d 7e 01 8b 89 e4 13 00 00 48 39 cf 73 08 48 89 44 f2 RSP: 0018:ffffc9001828f988 EFLAGS: 00010246 RAX: ffffffff839f8336 RBX: 0000000000000001 RCX: ffff88805a9bc5c0 RDX: 0000000000000000 RSI: ffffffff8903523f RDI: ffffffff88e90cfe RBP: dffffc0000000000 R08: ffffffff86ddfb36 R09: fffffbfff162e09f R10: fffffbfff162e09f R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffffffff12c3b30 R14: ffffffff8903523f R15: ffffffff88e90cfe FS: 00007f1e84830700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000a8dda000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_preemption_disabled+0x16/0x240 lib/smp_processor_id.c:13 rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:314 [inline] rcu_is_watching+0x1c/0xa0 kernel/rcu/tree.c:1079 rcu_read_lock include/linux/rcupdate.h:635 [inline] inet_twsk_purge+0x115/0x820 net/ipv4/inet_timewait_sock.c:268 ops_exit_list net/core/net_namespace.c:189 [inline] setup_net+0x606/0x770 net/core/net_namespace.c:364 copy_net_ns+0x339/0x540 net/core/net_namespace.c:482 create_new_namespaces+0x52e/0x9f0 kernel/nsproxy.c:110 copy_namespaces+0x2f6/0x370 kernel/nsproxy.c:179 copy_process+0x203b/0x52f0 kernel/fork.c:2102 _do_fork+0x134/0x650 kernel/fork.c:2444 __do_sys_clone kernel/fork.c:2600 [inline] __se_sys_clone kernel/fork.c:2581 [inline] __x64_sys_clone+0x21c/0x260 kernel/fork.c:2581 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca59 Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1e8482fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00000000004db0a0 RCX: 000000000045ca59 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 00000000e32a8480 RBP: 000000000078c0e0 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000007b R14: 00000000004c33b4 R15: 00007f1e848306d4 Modules linked in: CR2: 0000000000000000 ---[ end trace 3d5b11572a41bc23 ]--- RIP: 0010:__read_once_size include/linux/compiler.h:252 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x60 kernel/kcov.c:202 Code: c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 04 14 00 00 00 74 2c 8b 91 e0 13 00 00 83 fa 02 75 21 48 8b 91 e8 13 00 00 <48> 8b 32 48 8d 7e 01 8b 89 e4 13 00 00 48 39 cf 73 08 48 89 44 f2 RSP: 0018:ffffc9001828f988 EFLAGS: 00010246 RAX: ffffffff839f8336 RBX: 0000000000000001 RCX: ffff88805a9bc5c0 RDX: 0000000000000000 RSI: ffffffff8903523f RDI: ffffffff88e90cfe RBP: dffffc0000000000 R08: ffffffff86ddfb36 R09: fffffbfff162e09f R10: fffffbfff162e09f R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffffffff12c3b30 R14: ffffffff8903523f R15: ffffffff88e90cfe FS: 00007f1e84830700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000a8dda000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400