BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1355 xt_CT: No such helper "netbios-ns" in_atomic(): 0, irqs_disabled(): 0, pid: 17381, name: syz-executor.1 3 locks held by syz-executor.1/17381: #0: 0000000022633430 (&table[i].mutex){+.+.}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: 0000000022633430 (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0x98d/0xf60 net/netfilter/nfnetlink.c:223 #1: 000000002fbe3bc7 (rcu_read_lock){....}, at: ctnetlink_create_conntrack+0x199/0x12c0 net/netfilter/nf_conntrack_netlink.c:1929 #2: 00000000e199349a (&mm->mmap_sem){++++}, at: __do_page_fault+0x3e2/0xde0 arch/x86/mm/fault.c:1341 xt_CT: No such helper "netbios-ns" Preemption disabled at: [] rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1076 [inline] [] rcu_lockdep_current_cpu_online+0x32/0x1b0 kernel/rcu/tree.c:1068 CPU: 1 PID: 17381 Comm: syz-executor.1 Not tainted 4.19.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 ___might_sleep.cold+0x235/0x250 kernel/sched/core.c:6196 __do_page_fault+0x40d/0xde0 arch/x86/mm/fault.c:1355 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0010:0x40 Code: Bad RIP value. RSP: 0018:ffff88820c61f190 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007d6f000 RDX: 1ffff11013722d6f RSI: ffff88820c61f210 RDI: ffff88820c61f260 RBP: ffff8880a44a7500 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 000000002104dae5 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88809b916b40 R15: ffff88820c61f210 xt_CT: No such helper "netbios-ns" xt_CT: No such helper "netbios-ns" BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 PGD 20fb01067 P4D 20fb01067 PUD 20e012067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN xt_CT: No such helper "netbios-ns" CPU: 0 PID: 17381 Comm: syz-executor.1 Tainted: G W 4.19.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x40 Code: Bad RIP value. RSP: 0018:ffff88820c61f190 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007d6f000 RDX: 1ffff11013722d6f RSI: ffff88820c61f210 RDI: ffff88820c61f260 RBP: ffff8880a44a7500 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 000000002104dae5 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88809b916b40 R15: ffff88820c61f210 FS: 00007f878df82700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000016 CR3: 00000001fcdd2000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 xt_CT: No such helper "netbios-ns" Call Trace: Modules linked in: CR2: 0000000000000040 ---[ end trace 1e852a907aa61a87 ]--- RIP: 0010:0x40 Code: Bad RIP value. RSP: 0018:ffff88820c61f190 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90007d6f000 RDX: 1ffff11013722d6f RSI: ffff88820c61f210 RDI: ffff88820c61f260 RBP: ffff8880a44a7500 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 000000002104dae5 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88809b916b40 R15: ffff88820c61f210 FS: 00007f878df82700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007face0abe000 CR3: 00000001fcdd2000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600