bisecting fixing commit since a14d273ba15968495896a38b7b3399dba66d0270
building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9
testing commit a14d273ba15968495896a38b7b3399dba66d0270 with gcc (GCC) 10.2.1 20210217
kernel signature: ce6bf77db85b3a35e8a2581df87f896000050ffee686ed24c204860d7fdb696c
run #0: crashed: kernel panic: Attempted to kill init!
run #1: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor466292196" "root@10.128.0.92:./syz-executor466292196"]: exit status 1
ssh: connect to host 10.128.0.92 port 22: Connection timed out
lost connection

run #2: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor901456371" "root@10.128.1.104:./syz-executor901456371"]: exit status 1
ssh: connect to host 10.128.1.104 port 22: Connection timed out
lost connection

run #3: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor523912374" "root@10.128.10.9:./syz-executor523912374"]: exit status 1
ssh: connect to host 10.128.10.9 port 22: Connection timed out
lost connection

run #4: crashed: kernel panic: Attempted to kill init!
run #5: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor213554845" "root@10.128.0.244:./syz-executor213554845"]: exit status 1
ssh: connect to host 10.128.0.244 port 22: Connection timed out
lost connection

run #6: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor927526232" "root@10.128.10.12:./syz-executor927526232"]: exit status 1
ssh: connect to host 10.128.10.12 port 22: Connection timed out
lost connection

run #7: crashed: kernel panic: Attempted to kill init!
run #8: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor196167383" "root@10.128.1.27:./syz-executor196167383"]: exit status 1
ssh: connect to host 10.128.1.27 port 22: Connection timed out
lost connection

run #9: crashed: kernel panic: Attempted to kill init!
run #10: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor472914506" "root@10.128.10.20:./syz-executor472914506"]: exit status 1
ssh: connect to host 10.128.10.20 port 22: Connection timed out
lost connection

run #11: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor929494817" "root@10.128.10.14:./syz-executor929494817"]: exit status 1
ssh: connect to host 10.128.10.14 port 22: Connection timed out
lost connection

run #12: crashed: kernel panic: Attempted to kill init!
run #13: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor269101580" "root@10.128.0.48:./syz-executor269101580"]: exit status 1
ssh: connect to host 10.128.0.48 port 22: Connection timed out
lost connection

run #14: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor887086587" "root@10.128.1.53:./syz-executor887086587"]: exit status 1
ssh: connect to host 10.128.1.53 port 22: Connection timed out
lost connection

run #15: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor418503966" "root@10.128.1.121:./syz-executor418503966"]: exit status 1
ssh: connect to host 10.128.1.121 port 22: Connection timed out
lost connection

run #16: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor200772069" "root@10.128.0.151:./syz-executor200772069"]: exit status 1
ssh: connect to host 10.128.0.151 port 22: Connection timed out
lost connection

run #17: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor945289216" "root@10.128.10.17:./syz-executor945289216"]: exit status 1
ssh: connect to host 10.128.10.17 port 22: Connection timed out
lost connection

run #18: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor572244319" "root@10.128.10.24:./syz-executor572244319"]: exit status 1
ssh: connect to host 10.128.10.24 port 22: Connection timed out
lost connection

run #19: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor451417906" "root@10.128.10.30:./syz-executor451417906"]: exit status 1
ssh: connect to host 10.128.10.30 port 22: Connection timed out
lost connection

testing current HEAD 1682d8df20aa505f6ab12c76e934b26ede39c529
testing commit 1682d8df20aa505f6ab12c76e934b26ede39c529 with gcc (GCC) 10.2.1 20210217
kernel signature: 0410e0faa535753e2e2c836473706adbd4175fd9bbe455dfde34af9947054adf
run #0: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #1: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #2: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #3: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #4: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #5: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #6: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #7: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #8: basic kernel testing failed: WARNING in __nf_unregister_net_hook
run #9: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/tmp/syz-executor764726068" "root@10.128.1.125:./syz-executor764726068"]: exit status 1
ssh: connect to host 10.128.1.125 port 22: Connection timed out
lost connection

revisions tested: 2, total time: 21m45.473867447s (build: 14m6.803240261s, test: 7m2.355531805s)
bisection is inconclusive, the first good commit could be any of:
a14d273ba15968495896a38b7b3399dba66d0270
1682d8df20aa505f6ab12c76e934b26ede39c529