bisecting cause commit starting from 0c38740c08962ab109267cb23f4a40df2ccf2bbf building syzkaller on aba2b2fb3544d9e42991237c13d8cada421deda5 testing commit 0c38740c08962ab109267cb23f4a40df2ccf2bbf with gcc (GCC) 10.2.1 20210217 kernel signature: 36985fa0a1e2049476bd686c8568e68ef7782ccfee4d8d00ef2b00cf660090c4 run #0: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #1: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK reproducer seems to be flaky testing release v5.12 testing commit 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 with gcc (GCC) 10.2.1 20210217 kernel signature: ede0a6be35d02bcdc3983e7c04226f9d08a8bc9a29385bbaf2255819d572192e all runs: OK # git bisect start 0c38740c08962ab109267cb23f4a40df2ccf2bbf 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 Bisecting: 9151 revisions left to test after this (roughly 13 steps) [bc6a385132601c29a6da1dbf8148c0d3c9ad36dc] block: fix a race between del_gendisk and BLKRRPART testing commit bc6a385132601c29a6da1dbf8148c0d3c9ad36dc with gcc (GCC) 10.2.1 20210217 kernel signature: c1979b559b07ae6cf45303d9a3ac9e7d4d0520f89bc68eb6ce841e91dbf8d230 all runs: OK # git bisect good bc6a385132601c29a6da1dbf8148c0d3c9ad36dc Bisecting: 4563 revisions left to test after this (roughly 12 steps) [4f9701057a9cc1ae6bfc533204c9d3ba386687de] Merge tag 'iommu-updates-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu testing commit 4f9701057a9cc1ae6bfc533204c9d3ba386687de with gcc (GCC) 10.2.1 20210217 kernel signature: 54b36c7bd55630b73a1a9531b93829f1ffc4ff192ad59615945ce6d443a7d65f 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: crashed: 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: WARNING in __nf_unregister_net_hook run #10: crashed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #13: crashed: WARNING in __nf_unregister_net_hook run #14: crashed: WARNING in __nf_unregister_net_hook run #15: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #16: crashed: WARNING in __nf_unregister_net_hook run #17: crashed: WARNING in __nf_unregister_net_hook run #18: crashed: WARNING in __nf_unregister_net_hook run #19: crashed: WARNING in __nf_unregister_net_hook # git bisect bad 4f9701057a9cc1ae6bfc533204c9d3ba386687de Bisecting: 2293 revisions left to test after this (roughly 11 steps) [cad4162a90aeff737a16c0286987f51e927f003a] Merge branch 'stmmac-swmac-desc-prefetch' testing commit cad4162a90aeff737a16c0286987f51e927f003a with gcc (GCC) 10.2.1 20210217 kernel signature: 51d9fe4e19de4a062617b47c996eb98bfaaf8336627831794600d30b5bf44ac9 run #0: basic kernel testing failed: failed to copy test binary to VM: timedout ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/bin/linux_amd64/syz-execprog" "root@10.128.0.125:./syz-execprog"] Warning: Permanently added '10.128.0.125' (ECDSA) to the list of known hosts. run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK # git bisect good cad4162a90aeff737a16c0286987f51e927f003a Bisecting: 1382 revisions left to test after this (roughly 10 steps) [95275402f66e88c56144a2d859c13594b651b29b] Merge tag 'drm-next-2021-04-30' of git://anongit.freedesktop.org/drm/drm testing commit 95275402f66e88c56144a2d859c13594b651b29b with gcc (GCC) 10.2.1 20210217 kernel signature: 3b2727dfc884f0349f9da7e4632ea5918391f88d7a69e31f25394e42b27c95ce 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: crashed: WARNING in __nf_unregister_net_hook run #10: crashed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #13: crashed: WARNING in __nf_unregister_net_hook run #14: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #15: crashed: WARNING in __nf_unregister_net_hook run #16: crashed: WARNING in __nf_unregister_net_hook run #17: crashed: WARNING in __nf_unregister_net_hook run #18: crashed: WARNING in __nf_unregister_net_hook run #19: crashed: WARNING in __nf_unregister_net_hook # git bisect bad 95275402f66e88c56144a2d859c13594b651b29b Bisecting: 438 revisions left to test after this (roughly 9 steps) [8ca5297e7e38f2dc8c753d33a5092e7be181fff0] Merge tag 'kconfig-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild testing commit 8ca5297e7e38f2dc8c753d33a5092e7be181fff0 with gcc (GCC) 10.2.1 20210217 kernel signature: 29317207dcb5bbe6f43f9ff34f02550e34810e3910856d8f74a96f7e37a0f704 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: crashed: 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: WARNING in __nf_unregister_net_hook run #10: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: crashed: WARNING in __nf_unregister_net_hook run #13: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #14: crashed: WARNING in __nf_unregister_net_hook run #15: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #16: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #17: crashed: WARNING in __nf_unregister_net_hook run #18: crashed: WARNING in __nf_unregister_net_hook run #19: crashed: WARNING in __nf_unregister_net_hook # git bisect bad 8ca5297e7e38f2dc8c753d33a5092e7be181fff0 Bisecting: 230 revisions left to test after this (roughly 8 steps) [1e5e4acb66ed8f337e60bb1b15b46cc91361d181] Merge tag 'mlx5-updates-2021-04-21' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux testing commit 1e5e4acb66ed8f337e60bb1b15b46cc91361d181 with gcc (GCC) 10.2.1 20210217 kernel signature: 11dc5b144674b8779210d58db1b018bc0a9e067bba07083d8ffaf817cc3e4935 all runs: OK # git bisect good 1e5e4acb66ed8f337e60bb1b15b46cc91361d181 Bisecting: 118 revisions left to test after this (roughly 7 steps) [69e16d01d1de4f1249869de342915f608feb55d5] net: fix a concurrency bug in l2tp_tunnel_register() testing commit 69e16d01d1de4f1249869de342915f608feb55d5 with gcc (GCC) 10.2.1 20210217 kernel signature: f9930c8cd89cdcb704965c65b37415fa7cc2485e7b3177eb3ed8bd61baa31d73 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: WARNING in __nf_unregister_net_hook run #10: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #13: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #14: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #15: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #16: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #17: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #18: crashed: WARNING in __nf_unregister_net_hook run #19: basic kernel testing failed: WARNING in __nf_unregister_net_hook # git bisect bad 69e16d01d1de4f1249869de342915f608feb55d5 Bisecting: 66 revisions left to test after this (roughly 6 steps) [6876a18d3361e1893187970e1881a1d88d894d3f] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 6876a18d3361e1893187970e1881a1d88d894d3f with gcc (GCC) 10.2.1 20210217 kernel signature: fb0f5961f91731434bdb98adf2dd11173cd3df1c8397a202cb41cb929b206b49 all runs: OK # git bisect good 6876a18d3361e1893187970e1881a1d88d894d3f Bisecting: 33 revisions left to test after this (roughly 5 steps) [517a882aa2b586b5c1b3cf9b1dec1593d191776d] dt-bindings: net: dwmac: Add Rockchip DWMAC support testing commit 517a882aa2b586b5c1b3cf9b1dec1593d191776d with gcc (GCC) 10.2.1 20210217 kernel signature: 5d5888123dbe2b96b966140748d0b367da56efd3db478abffbe3bba7843c759c 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: crashed: 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: WARNING in __nf_unregister_net_hook run #10: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #13: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #14: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #15: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #16: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #17: crashed: WARNING in __nf_unregister_net_hook run #18: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #19: crashed: WARNING in __nf_unregister_net_hook # git bisect bad 517a882aa2b586b5c1b3cf9b1dec1593d191776d Bisecting: 16 revisions left to test after this (roughly 4 steps) [593268ddf3887362ba8b8998cb85433596a3e8f5] netfilter: nf_log_syslog: Unset bridge logger in pernet exit testing commit 593268ddf3887362ba8b8998cb85433596a3e8f5 with gcc (GCC) 10.2.1 20210217 kernel signature: bfb02668a57e5d6a8ee34bd0e2fbd4c509ea59347b35de9c74b52acafc991b06 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: crashed: 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: WARNING in __nf_unregister_net_hook run #10: crashed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #13: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #14: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #15: crashed: WARNING in __nf_unregister_net_hook run #16: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #17: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #18: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #19: crashed: WARNING in __nf_unregister_net_hook # git bisect bad 593268ddf3887362ba8b8998cb85433596a3e8f5 Bisecting: 7 revisions left to test after this (roughly 3 steps) [6c0717545f2ca61c95f5f739da845e77cc8bd498] netfilter: ip6tables: unregister the tables by name testing commit 6c0717545f2ca61c95f5f739da845e77cc8bd498 with gcc (GCC) 10.2.1 20210217 kernel signature: 990fdb1d6528a14b19d0070fec646e8194e882f076b27e25f25604c17efef57a all runs: OK # git bisect good 6c0717545f2ca61c95f5f739da845e77cc8bd498 Bisecting: 3 revisions left to test after this (roughly 2 steps) [ae689334225ff0e4ef112459ecd24aea932c2b00] netfilter: ip_tables: pass table pointer via nf_hook_ops testing commit ae689334225ff0e4ef112459ecd24aea932c2b00 with gcc (GCC) 10.2.1 20210217 kernel signature: 45fb961bbfdcc489f01204ef8a4aa0007c4ca8e327063b5f9acd7c361c76a206 all runs: OK # git bisect good ae689334225ff0e4ef112459ecd24aea932c2b00 Bisecting: 1 revision left to test after this (roughly 1 step) [ee177a54413a33fe474d55fabb5f8ff390bb27d7] netfilter: ip6_tables: pass table pointer via nf_hook_ops testing commit ee177a54413a33fe474d55fabb5f8ff390bb27d7 with gcc (GCC) 10.2.1 20210217 kernel signature: ef0b630b536d2b77f0b99872361bf9f152c88ba50ffd3bf59ed47a3499303fe1 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: crashed: 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: crashed: WARNING in __nf_unregister_net_hook run #10: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #13: crashed: WARNING in __nf_unregister_net_hook run #14: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #15: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #16: crashed: WARNING in __nf_unregister_net_hook run #17: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #18: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #19: basic kernel testing failed: WARNING in __nf_unregister_net_hook # git bisect bad ee177a54413a33fe474d55fabb5f8ff390bb27d7 Bisecting: 0 revisions left to test after this (roughly 0 steps) [f9006acc8dfe59e25aa75729728ac57a8d84fc32] netfilter: arp_tables: pass table pointer via nf_hook_ops testing commit f9006acc8dfe59e25aa75729728ac57a8d84fc32 with gcc (GCC) 10.2.1 20210217 kernel signature: ca773587faf6b7e9473e944148474b55ed490f053a8f553b8ec678df297af555 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: crashed: WARNING in __nf_unregister_net_hook run #3: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #4: crashed: WARNING in __nf_unregister_net_hook run #5: crashed: 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: WARNING in __nf_unregister_net_hook run #10: crashed: WARNING in __nf_unregister_net_hook run #11: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #12: crashed: WARNING in __nf_unregister_net_hook run #13: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #14: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #15: crashed: WARNING in __nf_unregister_net_hook run #16: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #17: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #18: basic kernel testing failed: WARNING in __nf_unregister_net_hook run #19: crashed: WARNING in __nf_unregister_net_hook # git bisect bad f9006acc8dfe59e25aa75729728ac57a8d84fc32 f9006acc8dfe59e25aa75729728ac57a8d84fc32 is the first bad commit commit f9006acc8dfe59e25aa75729728ac57a8d84fc32 Author: Florian Westphal Date: Wed Apr 21 09:51:08 2021 +0200 netfilter: arp_tables: pass table pointer via nf_hook_ops Same change as previous patch. Only difference: no need to handle NULL template_ops parameter, the only caller (arptable_filter) always passes non-NULL argument. This removes all remaining accesses to net->ipv4.arptable_filter. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso include/linux/netfilter_arp/arp_tables.h | 2 +- net/ipv4/netfilter/arp_tables.c | 43 +++++++++++++++++++++----------- net/ipv4/netfilter/arptable_filter.c | 6 ++--- 3 files changed, 32 insertions(+), 19 deletions(-) culprit signature: ca773587faf6b7e9473e944148474b55ed490f053a8f553b8ec678df297af555 parent signature: 45fb961bbfdcc489f01204ef8a4aa0007c4ca8e327063b5f9acd7c361c76a206 Reproducer flagged being flaky revisions tested: 16, total time: 3h35m9.773265062s (build: 1h51m39.212005202s, test: 1h41m33.399522679s) first bad commit: f9006acc8dfe59e25aa75729728ac57a8d84fc32 netfilter: arp_tables: pass table pointer via nf_hook_ops recipients (to): ["coreteam@netfilter.org" "davem@davemloft.net" "dsahern@kernel.org" "fw@strlen.de" "fw@strlen.de" "kadlec@netfilter.org" "kuba@kernel.org" "netdev@vger.kernel.org" "netfilter-devel@vger.kernel.org" "pablo@netfilter.org" "pablo@netfilter.org" "yoshfuji@linux-ipv6.org"] recipients (cc): ["linux-kernel@vger.kernel.org"] crash: WARNING in __nf_unregister_net_hook ------------[ cut here ]------------ hook not found, pf 3 num 0 WARNING: CPU: 1 PID: 162 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x17a/0x560 net/netfilter/core.c:480 Modules linked in: CPU: 1 PID: 162 Comm: kworker/u4:3 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:__nf_unregister_net_hook+0x17a/0x560 net/netfilter/core.c:480 Code: 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 03 00 00 8b 53 1c 44 89 e6 48 c7 c7 20 bc 9e 89 4c 89 04 24 e8 6e 3a 62 01 <0f> 0b 4c 8b 04 24 e9 ba 00 00 00 48 89 ea 48 c1 e2 04 49 8d 7c 10 RSP: 0018:ffffc900010afbf0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff888021db7b00 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffff52000215f70 RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ba11fa1b R10: ffffed1017423f43 R11: 0000000000000001 R12: 0000000000000003 R13: ffff888028f58000 R14: ffff888021db7b1c R15: ffff888028f58f60 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f02c17486c0 CR3: 000000000a68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nf_unregister_net_hook net/netfilter/core.c:502 [inline] nf_unregister_net_hooks+0xb1/0xf0 net/netfilter/core.c:576 ops_pre_exit_list net/core/net_namespace.c:165 [inline] cleanup_net+0x3a4/0x990 net/core/net_namespace.c:583 process_one_work+0x84c/0x13b0 kernel/workqueue.c:2275 worker_thread+0x598/0xf80 kernel/workqueue.c:2421 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294