bisecting cause commit starting from 4ca0d9ac3fd8f9f90b72a15d8da2aca3ffb58418 building syzkaller on 424dd8e7b52828cad44ce653a5d4ac30670f5e2c testing commit 4ca0d9ac3fd8f9f90b72a15d8da2aca3ffb58418 with gcc (GCC) 8.1.0 kernel signature: 160a12b1975b61a71819eca19347d8900bf3fdde42b3154227a2b5200f33eb47 all runs: crashed: WARNING in rtnl_delete_link testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: a9dacc52fd1e71560f78ed18dfb3c360ad9f03fbb749d28a67cef7eedaa581bb run #0: crashed: WARNING in rtnl_delete_link run #1: crashed: WARNING in rtnl_delete_link run #2: crashed: WARNING in rtnl_delete_link run #3: crashed: WARNING in rtnl_delete_link run #4: crashed: WARNING in rtnl_delete_link run #5: crashed: WARNING in rtnl_delete_link run #6: crashed: WARNING in rtnl_delete_link run #7: crashed: WARNING in rtnl_delete_link run #8: crashed: WARNING in rtnl_delete_link run #9: boot failed: can't ssh into the instance testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: 149f78323053df7739e68281af8d7d3db477d063d8ef7fe26b5439955a4531ca all runs: crashed: WARNING in rtnl_delete_link testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: f0d4ded9a488668e3ee994ca33142fc9be61d263c73f7dce1a88b4db3f109209 all runs: crashed: WARNING in rtnl_delete_link testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: baef74b25be6426512dc1c8b46f976498631c4b649df606da04bc172c0670192 all runs: crashed: WARNING in rtnl_delete_link testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 640d18e18ce24b9daec54a1d7e654f326f3de7b9dd5904cfd9d665530d842b36 all runs: crashed: WARNING in rtnl_delete_link testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 2f42b9e8859e698d014a50063abaf778551337aa5dd05da4b66ef681a70bcfd5 all runs: crashed: WARNING in rtnl_delete_link testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 651bfc6d91995094a356182d483cc30a99f03ab234f60828fc579d5cda0806a6 all runs: crashed: WARNING in rtnl_delete_link testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 9daccc3d1e0ecc27a30e411ff7133689622622182e1f0654c222797cb5d5c7cd all runs: crashed: WARNING in rtnl_delete_link testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: c630f20d54d376c9c3e438260844e1e6db652e37284ba2e37562a23b8c676fc4 all runs: crashed: WARNING in rtnl_delete_link testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 49b122897b99574697d1876526c13c97c401e170d700acef7cf150b3fef19c1b run #0: crashed: WARNING in rtnl_delete_link run #1: crashed: WARNING in rtnl_delete_link run #2: crashed: WARNING in rtnl_delete_link run #3: crashed: general protection fault in batadv_iv_ogm_queue_add run #4: crashed: WARNING in rtnl_delete_link run #5: crashed: WARNING in rtnl_delete_link run #6: crashed: WARNING in rtnl_delete_link run #7: crashed: WARNING in rtnl_delete_link run #8: crashed: WARNING in rtnl_delete_link run #9: crashed: WARNING in rtnl_delete_link testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 0cea10662a4d98a4e7392dc39d3e522ff578bd2609322ec2e314302c69305995 run #0: crashed: WARNING in rtnl_delete_link run #1: crashed: WARNING in rtnl_delete_link run #2: crashed: WARNING in rtnl_delete_link run #3: crashed: WARNING in rtnl_delete_link run #4: crashed: KASAN: null-ptr-deref Read in batadv_tvlv_container_ogm_append run #5: crashed: WARNING in rtnl_delete_link run #6: crashed: WARNING in rtnl_delete_link run #7: crashed: WARNING in rtnl_delete_link run #8: crashed: WARNING in rtnl_delete_link run #9: crashed: WARNING in rtnl_delete_link testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 89cc2e0e050b7c41e85aa070b8591bca1885edcae6f51178c1c976245640c84d all runs: crashed: WARNING in rtnl_delete_link testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 5471cd44a41bb293a00d87b5c1374143c3c548eb0a559698632b5402c33039b3 all runs: crashed: possible deadlock in bond_get_stats testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: ac96cea3791d453ad2e015cb1e220ae39c824c4c79353743713b4d1bb5a18120 all runs: crashed: possible deadlock in bond_get_stats testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: a53424f4ff084a197fd889dbebc3e041052aa555c780b75e66e14b3b52b243ce all runs: crashed: possible deadlock in bond_get_stats testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 3d7f96a3e0c7f5ad30b81b012ee077a6d346db0f09d7bfa8697bac18b14cef2a all runs: crashed: possible deadlock in bond_get_stats testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: c394a5f0f0f6d7f6a221a3c7782dc1735b81af5a2cdb8c1180a36b072362a607 run #0: crashed: possible deadlock in team_vlan_rx_add_vid run #1: crashed: possible deadlock in team_vlan_rx_add_vid run #2: crashed: possible deadlock in team_vlan_rx_add_vid run #3: crashed: possible deadlock in team_vlan_rx_add_vid run #4: crashed: possible deadlock in team_vlan_rx_add_vid run #5: crashed: possible deadlock in team_vlan_rx_add_vid run #6: crashed: unregister_netdevice: waiting for DEV to become free run #7: crashed: unregister_netdevice: waiting for DEV to become free run #8: crashed: unregister_netdevice: waiting for DEV to become free run #9: OK testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: f794b52486e0bcd6da83c688186a29d4ed34ce230e6865be3fd5e9f45663a5eb all runs: crashed: BUG: sleeping function called from invalid context in tap_get_minor testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: 10490afeb69849211b4d15637615930ab61ee15019a98653fa33435c39b977a2 all runs: crashed: BUG: sleeping function called from invalid context in tap_get_minor testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: 7dc32c9e5ba1c61fd262a92441cc8f704cd663974d5b05b00ab07fe9a8e31211 run #0: crashed: possible deadlock in bond_get_stats run #1: crashed: possible deadlock in bond_get_stats run #2: crashed: possible deadlock in bond_get_stats run #3: crashed: WARNING in nf_unregister_net_hook run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 3e7fc976dd300fedaafbbc5c36c07a03f64dff7a075dba10e53184425d12b87c run #0: crashed: possible deadlock in bond_get_stats run #1: crashed: WARNING in nf_unregister_net_hook run #2: crashed: possible deadlock in bond_get_stats run #3: crashed: possible deadlock in bond_get_stats run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 6a860f263d11af10e1e49b7c4aef1beeb2c39ea66b0eae66f6141b80aa94f282 run #0: crashed: possible deadlock in bond_get_stats run #1: crashed: possible deadlock in bond_get_stats run #2: crashed: possible deadlock in bond_get_stats run #3: crashed: possible deadlock in bond_get_stats run #4: crashed: possible deadlock in bond_get_stats run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 6a25919ba4b72e1d5ae9b52b862b29a5d095fffa1cedd1c305b976f0fb19b658 run #0: crashed: possible deadlock in bond_get_stats run #1: crashed: possible deadlock in bond_get_stats run #2: crashed: possible deadlock in bond_get_stats run #3: crashed: possible deadlock in bond_get_stats run #4: crashed: KASAN: use-after-free Read in macsec_notify run #5: crashed: KASAN: use-after-free Read in macsec_notify run #6: crashed: KASAN: use-after-free Read in macsec_notify run #7: crashed: KASAN: use-after-free Read in macsec_notify run #8: crashed: KASAN: use-after-free Read in macsec_notify run #9: crashed: KASAN: use-after-free Read in macsec_notify testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: c422a853761c206ce6935f7add725921818e3f59585bc647aa5f92e03b64d543 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 25, total time: 4h18m15.455404486s (build: 2h14m8.780387392s, test: 2h0m17.574738518s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered forwarding state IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5883 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 sysfs: cannot create duplicate filename '/class/macvtap/tap50' Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 5883 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ffff8800b245efc8 ffffffff82c65e52 ffffffff85c81040 ffff8800b245f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 ffff8800b245f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x136/0x1d4 lib/dump_stack.c:51 [] panic+0x1af/0x348 kernel/panic.c:152 [] __warn+0x18d/0x1b0 kernel/panic.c:504 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527 [] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51 [] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] [] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92 [] device_add_class_symlinks drivers/base/core.c:891 [inline] [] device_add+0x677/0x1350 drivers/base/core.c:1086 [] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709 [] device_create_vargs drivers/base/core.c:1749 [inline] [] device_create+0x88/0xa0 drivers/base/core.c:1785 [] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298 [] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93 [] __raw_notifier_call_chain kernel/notifier.c:394 [inline] [] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401 [] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643 [] call_netdevice_notifiers net/core/dev.c:1659 [inline] [] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027 [] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316 [] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471 [] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466 [] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513 [] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277 [] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519 [] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline] [] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240 [] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xb5/0xf0 net/socket.c:622 [] SYSC_sendto net/socket.c:1648 [inline] [] SyS_sendto+0x1ca/0x290 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled