bisecting cause commit starting from 906c40438bb669b253d0daeaf5f37a9f78a81b41 building syzkaller on 05736b290dd5af17adbb0fb5ea67405a0167a7c8 testing commit 906c40438bb669b253d0daeaf5f37a9f78a81b41 with gcc (GCC) 8.1.0 kernel signature: f7a0f723bb5a6ab6757910b1c0a3b05dc3fd2fb096ff10af88e7a2d740317aa1 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 507daea1fc8a647494d2ddd335dfc86800f8daa3b4e852cdd38c54fec21ff8fc all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 6957d368136dc10d388a3f6420d454ecbf57df3d6c8805224f9d87cd577761e2 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: bc3aafd4bfcdb927b5cf227c5485832bbca98e750e88d13f8cbf8a2471f8b056 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: a98cbaf228fbb6e6062419eccdbf8d9fa28d545083ea9c38c833c0dabbf7d2c4 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 0db0c6e77f68fec55ff74841fc4bfd8679607a3f0040faac69d238c29f6670d9 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 869170063096b55ffb0dbee679002f22fbc9538735243eb89c493f9db9ee4fa9 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: d8d2039f17da999a8fd0a5be1d3a1310bf537317e06da1fe302a2b0319d7b9f4 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 08c155fbc6b505cc2445637a6ff72afe852ddde8a388c4e8ff74150f6e811235 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 622658518d01f180dcd8e37e3a1a59e256ecb9f788c8630c60971b56022d50d5 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 2cad371a4f9871c75fd88b5cad7bb60db6a7cbc58e64a2f395028dbc6b492890 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 94730e60db212498050e834302018bb7d0acc7986b1550388d80238ab9ab3769 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 92fa7503b85e0959e090577d3ac375bf8bc9fe14658781f29e29eed31b5c5047 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 4aec33023d33015a31ceae1168783f78028ec430a5bafa13b2407a3bc4cc2e2f all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 5af6d06af79a7d4d560c534f6e76b00f9a555a4719ccb0323aec82f33f8b4b9d all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: ab8237e7ab15b9e52f331c7e372c3592f777d077448c01dbdfbf6bab8fe0ae27 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: a7e603d5d1c529727d95a258c6b5fa9ce55c2eebf0bbf69a0c21ddf45d4edce7 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: 8a0f48f8f49a6aaa4f75876ced0b159215a5b9024b25bd37e2db7a6f55baba15 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: b6ad230a587e9c5af60339239b34c5627651382ae5e035cb4891848b2ccb76f3 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 39411919b2923acf5a3d938bfe525ae7ff6c72406e9746d5d8a8dbe11426e7c7 all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 66b3b32b1c25000f2fceef685e41d47ad19a3606185292a63b021f9629d89d7a all runs: crashed: KASAN: slab-out-of-bounds Read in selinux_xfrm_alloc_user testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: eac26773e59bbe1b0cba7c65366ff5f4968c71a01dda6f64ec65d23b3567ef0a all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 22, total time: 3h7m52.252938773s (build: 1h54m16.822690211s, test: 1h11m9.135631389s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup device bridge_slave_0 entered promiscuous mode bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5882 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: 5882 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 1ffffffff0d95756 ffff880128a0efb0 ffffffff82c74fc6 ffffffff85c81040 ffff880128a0f088 ffffffff85d2bac0 ffffffff81922ccb ffff880128a0f078 ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xe6/0x120 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.2+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+0x689/0x1360 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+0x88a/0xce0 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+0x455/0x660 net/netlink/af_netlink.c:1240 [] netlink_sendmsg+0x893/0xb40 net/netlink/af_netlink.c:1786 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xb5/0xf0 net/socket.c:622 [] SYSC_sendto+0x1c9/0x300 net/socket.c:1648 [] SyS_sendto+0x9/0x10 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled