bisecting cause commit starting from c2568c8c9e636a56abf31da4b28b65d3ded02524 building syzkaller on 1880b4a9f394370a7d1fcb5c1cfca0fa1127b463 testing commit c2568c8c9e636a56abf31da4b28b65d3ded02524 with gcc (GCC) 8.1.0 kernel signature: e5197ded3654b4b10b75dccdc30ff619acba7621a980192e954c807162e0b1ae all runs: crashed: WARNING in ieee80211_probe_client testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: 6ef2e43043e3c7ffa3e858e58c29242c1d97d9a1a61783188392eccbbbf3263b all runs: crashed: WARNING in ieee80211_probe_client testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: badc6bee9d55f5dad6f9e832222c9eb646c70a326a7ebe55fb78cb2c4e117c6f all runs: crashed: WARNING in ieee80211_probe_client testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: a526f5b30a24ac328e4ac21d3472b4d38752682f97b89736b10c59e4e83e64af run #0: crashed: WARNING in ieee80211_probe_client run #1: crashed: WARNING in ieee80211_probe_client run #2: crashed: WARNING in ieee80211_probe_client run #3: crashed: WARNING in ieee80211_probe_client run #4: crashed: WARNING in ieee80211_probe_client run #5: crashed: WARNING in ieee80211_probe_client run #6: crashed: WARNING in ieee80211_probe_client run #7: crashed: WARNING in ieee80211_probe_client run #8: crashed: WARNING in ieee80211_probe_client run #9: boot failed: can't ssh into the instance testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 6273aebb077aae26d6954d78e89e8f84db6fe49cbbc21bef33ecd8461c00e5ed all runs: crashed: WARNING in ieee80211_probe_client testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: a33282a94a8fd890e3f41ab33bb8ffa9f5d1bcd55753bb8744ed195002191e2f all runs: crashed: WARNING in ieee80211_probe_client testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 5adf04a8b7f3372cee14754934c6aa7a2b041e7e4d97bc1607f64e0172365794 all runs: crashed: WARNING in ieee80211_probe_client testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 1fb4aff4e7f7c8cf85ace3d247f93e132ac4938b24b9eec09962a8de0fe7d2f1 all runs: crashed: WARNING in ieee80211_probe_client testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: ae589fd4be68b0b758ef8304078cdb3297d38457a3476029022fe459ae84b329 all runs: crashed: WARNING in ieee80211_probe_client testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: e7ee3dd9396d64734ca8d125c10a941384a308dca383852f136f574ee39fb2c2 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 9b213cf652a9355fddd1c3fca4a3216fc3a56c285f084513600fe8d7ced88cd0 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 8b97d77b1ce67593d2e81451266b78c1d673751140eaf854c0dd7437f77a5e30 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: ad353dfe1dc9ffbc5606f21c548724d0b896f03af53b7f6431a6d76c0679a3cb all runs: crashed: WARNING in ieee80211_probe_client testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: db731a866ca3584e14bdefa544ca206d71d47d908c334124adad8d10bddb028d all runs: crashed: WARNING in ieee80211_probe_client testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: d592ac3bf97cb68203875e45df7ae7c329940500da751769a483208fc8c6f222 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 7d5dac4ba3dca5da5e4a14de9b3dac1d3000b078d6c42145e727d5dd63a1be03 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 4c3d528c3cc11247667ff925fab3183a07ef62cafdf7e586ba5c1201a9e6eff0 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: ffb83ac50a8affef0d84a0288722ca21397f4ca2e39d94bde5fcdd69e036a7c8 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: c506d480a4b54497d23b2870eab5ba4401a4abe708094459e7106bf03b41a69d 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: e67e2f9f83ceca7685814a08dd072b6f884a9f5cac7eb7d4b5a4e897d09bf688 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: 6455b5a8c17ede747bacf5eed2b67eb722bed653720be116293ef90eb72b06ec all runs: crashed: WARNING in ieee80211_probe_client testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: c3376134e34e103134cf77925be3f21728fc3371c255cbf62c73fce82b005290 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 2a740f9ee0c14b643671e0afa718f8353ea48dc0189a4ccc5bfc397b87943970 all runs: crashed: WARNING in ieee80211_probe_client testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: beff34e30d8735036089b932eda9baaeca463b90e3af8fcbebc7e2eab792a0fb run #0: crashed: general protection fault in batadv_iv_ogm_queue_add 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 testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 95b7833646b19561ed9b5d1548d497510ae2a86281087497ccc2e13c2d69bcee all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 25, total time: 4h2m34.887097328s (build: 2h26m21.077184934s, test: 1h32m5.793021126s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup bond0: Enslaving bond_slave_0 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5938 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: 5938 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ffff8800b1fb6fc8 ffffffff82e18b12 ffffffff85e81040 ffff8800b1fb70a0 ffffffff85f2bc00 ffffffff8191bd7b 0000000000000009 ffff8800b1fb7090 ffffffff8160d884 0000000041b58ab3 ffffffff86b3fd6a 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