bisecting cause commit starting from 11a48a5a18c63fd7621bb050228cebf13566e4d8 building syzkaller on 2b41159686513694e75f8c376b4a32c66c8b709f testing commit 11a48a5a18c63fd7621bb050228cebf13566e4d8 with gcc (GCC) 8.1.0 kernel signature: 6115329124d177c454d807aa5a6fe62baf687069b6e126835987bc146601a7b5 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 804e830983271f29e25e7c0b0f3ac59e08f55072edf6af36f3afe83cbb3331a2 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 66ede1bc5ea3922cef866f5db0d3171b0eefeeb62d261d4ff39f590cbb3b44e0 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 4efa576428ebc58c19d1cbd0da899c82b5d2329547f0da4c3b67a580bb93e42e all runs: crashed: KASAN: use-after-free Write in release_tty testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 288beff53e0e49e7653465cf05bb5b884317c4dfc03c9fc44bbefa842790524b all runs: crashed: KASAN: use-after-free Write in release_tty testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: f648e114b2a9c4631b76a95829235069981926389492d835f5f30c4137f4c006 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: f2a00001ea2301caee3ce72abce463d95c69d1c581fd9b72db20c4179a950836 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 17fd3186c51ccbc2bdcd1bd61f2ad37e42ee14802a9dc5a74f2776d5aa6f51e2 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 36715d9dcf42528bbd0785d17f48affecdedd6b4f5070d6d2fbad985d16cd438 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: bebcc035147949261a17478f248fca24b7fc4efc82cede965a8b990a2f71ceae all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 7f22ac874377d1f1c3fca82858ff01fee3ffa2f7400de618e2358c065d6bb6e8 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: a1593a9693e3ed0cc3da955e1fb3d83b90ea56a4a1a07201435000f52a479a53 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 37970ffa5144bfa75afb6749b8473bf74fa7c8a306f4df9feb1ce5882ae3cd3e all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: a1ed0f79b26daf2063c8357398bf705eedbd191bff968803af2fd1ce43868c84 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 5c8335a3ad56695b77225d1ca7abdaf6f16d1b297778aa6982e83adf58cd5fe7 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 80319f26043b1ad34707a4d93ebe0bda4b24deb4db2a5315e1d8b3c13baf5343 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: 09a5f7e0c7b162bb2e3031f26eb816434d4f0b76c4bae80e69c8e58788b69aad 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: 93745260cebd79018870d83d3e18fc9a7fba7ad92ecb8bd4bec82d506f687b8e all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 2fc5f412c33a68988ebe3e33fe01f67ceccafa82be2af5247eef5eb117054d94 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 5e31a841dfc8c19bd817586527e9238819cc6865b7c335be41aa788b80b812b9 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 6d894336668efa133416dc954a4bc4dbff3bd260537fbc66d7a145fa15951316 all runs: crashed: KASAN: use-after-free Write in release_tty testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: a52682308037d9a643dc23e9176b142419813ebfd19ab6dec856b306be07aca0 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 22, total time: 3h21m32.420858705s (build: 2h2m23.169136456s, test: 1h16m42.887357139s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode bond0: Enslaving bond_slave_0 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7605 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: 7605 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 1ffffffff0d95756 ffff88012a856fb0 ffffffff82c74fc6 ffffffff85c81040 ffff88012a857088 ffffffff85d2bac0 ffffffff81922ccb ffff88012a857078 ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 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