BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1333 in_atomic(): 0, irqs_disabled(): 0, pid: 28775, name: syz-executor.0 3 locks held by syz-executor.0/28775: #0: 00000000ac2f8808 (&table[i].mutex){+.+.}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #0: 00000000ac2f8808 (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0x9c1/0xf4b net/netfilter/nfnetlink.c:223 #1: 00000000aa2d2e7d (rcu_read_lock){....}, at: ctnetlink_create_conntrack+0x199/0x1280 net/netfilter/nf_conntrack_netlink.c:1929 #2: 0000000036ea45e4 (&mm->mmap_sem){++++}, at: __do_page_fault+0x39b/0xdd0 arch/x86/mm/fault.c:1319 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: 0 PID: 28775 Comm: syz-executor.0 Not tainted 4.19.108-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+0x188/0x20d lib/dump_stack.c:118 ___might_sleep.cold+0x1bd/0x1f9 kernel/sched/core.c:6192 __do_page_fault+0x3c6/0xdd0 arch/x86/mm/fault.c:1333 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1204 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff888201d8f1d8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90005e86000 RDX: 1ffffffff131c236 RSI: ffff888201d8f210 RDI: ffff888201d8f260 RBP: ffff8880453ce300 R08: ffff8880278a8480 R09: ffff888201d8f260 R10: ffffed10403b1e51 R11: ffff888201d8f28f R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff898e1178 R15: ffff888201d8f210 BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 9d8ed067 P4D 9d8ed067 PUD 1fb0a067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 28775 Comm: syz-executor.0 Tainted: G W 4.19.108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff888201d8f1d8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90005e86000 RDX: 1ffffffff131c236 RSI: ffff888201d8f210 RDI: ffff888201d8f260 RBP: ffff8880453ce300 R08: ffff8880278a8480 R09: ffff888201d8f260 R10: ffffed10403b1e51 R11: ffff888201d8f28f R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff898e1178 R15: ffff888201d8f210 FS: 00007f6031f12700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000282cd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nfnetlink_parse_nat net/netfilter/nf_nat_core.c:847 [inline] nfnetlink_parse_nat_setup+0x230/0x410 net/netfilter/nf_nat_core.c:884 ctnetlink_parse_nat_setup+0xb6/0x640 net/netfilter/nf_conntrack_netlink.c:1521 ctnetlink_setup_nat net/netfilter/nf_conntrack_netlink.c:1596 [inline] ctnetlink_create_conntrack+0x501/0x1280 net/netfilter/nf_conntrack_netlink.c:1984 ctnetlink_new_conntrack+0x4f5/0xde0 net/netfilter/nf_conntrack_netlink.c:2114 nfnetlink_rcv_msg+0xc9e/0xf4b net/netfilter/nfnetlink.c:228 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455 nfnetlink_rcv+0x1b2/0x420 net/netfilter/nfnetlink.c:560 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c4a9 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6031f11c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6031f126d4 RCX: 000000000045c4a9 RDX: 0000000000000000 RSI: 0000000020000640 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000959 R14: 00000000004cbd25 R15: 000000000076bf2c Modules linked in: CR2: 0000000000000000 ---[ end trace 52f3d25ccffdbd28 ]--- RIP: 0010: (null) Code: Bad RIP value. RSP: 0018:ffff888201d8f1d8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90005e86000 RDX: 1ffffffff131c236 RSI: ffff888201d8f210 RDI: ffff888201d8f260 RBP: ffff8880453ce300 R08: ffff8880278a8480 R09: ffff888201d8f260 R10: ffffed10403b1e51 R11: ffff888201d8f28f R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff898e1178 R15: ffff888201d8f210 FS: 00007f6031f12700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000282cd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400