bisecting cause commit starting from ccc1d052eff9f3cfe59d201263903fe1d46c79a5 building syzkaller on 5abc3f1ab298244473b613c289f1536e366fcf04 testing commit ccc1d052eff9f3cfe59d201263903fe1d46c79a5 with gcc (GCC) 8.1.0 kernel signature: bcf26836fc5ca7fb7f41cfdd1d25d8c0fef0f3c61e7d8be2ab930a9f4ba7f790 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_xa_dir testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: 9dfffb10b2696a8d36ca4895ed6cda798b2b7c494bdb21d541006d3d447b2f12 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in open_xa_dir testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: 8858a7c44b0b4560c45ff07b382dfeae5e66082ff52d8b82df8251b4c9958bf9 all runs: crashed: general protection fault in open_xa_dir testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: bb5dc3ef9b1a4a0f017f33d67709c2db54f9260b2abc92c3689a26c81f2dae1b all runs: crashed: general protection fault in open_xa_dir testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: f2838b971f419d65b7267b5d7f65eb5dfd442efc060613a1106cfa5455db2e54 all runs: crashed: general protection fault in open_xa_dir testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 0f1b7c4745c44939aa4b35d530d75e093e5862322191c843a37ce5d6d0c9a3b8 all runs: crashed: general protection fault in open_xa_dir testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 4ed52d0939e0441d6dfcac4b73e081c6f816c0c5eb43454d28784f74b7a92924 all runs: crashed: general protection fault in open_xa_dir testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: f69a4a3821499344b65d31490d398d14f84666b9469b87dd0166a9c8b7670264 all runs: crashed: general protection fault in open_xa_dir testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: b69a582f4849b3d2cd7971d00fe38fb8eeb4f673b63c194d886e224edb13d0af all runs: crashed: general protection fault in open_xa_dir testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 6d6b6275533e6911281562dd38a9dc1d392f6233d0a4b5341ff6c348f000b615 all runs: crashed: general protection fault in open_xa_dir testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 7220981558874cc9b00999e5c11bd71b108c4d9de093f99a3c1e09b2ac033c58 all runs: crashed: general protection fault in open_xa_dir testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 17a28b6a00887a3516ded09601497a135969614fa1d53b62c9f95deb09558add all runs: crashed: general protection fault in open_xa_dir testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: b0d5cc177c9a323629bdfb0bfecf870554ad985e7f9935237fb98a4648882096 all runs: crashed: general protection fault in open_xa_dir testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 1235a84b9cc336438b1edfab7686975cdbac684100f741ffb9b1cc58bd9ab1bf all runs: crashed: general protection fault in open_xa_dir testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 0f0b910b3c605322f05e5cb465a2b080968f92795440abafe90afe7ee03be09a all runs: crashed: general protection fault in open_xa_dir testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 08b083268dbd29613411bad712020dccdae4877e0e61f48df436f0361de1c806 all runs: crashed: general protection fault in open_xa_dir testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 5d0efe91d2fad73ef57d2f0078dc4a67924d7614bcd6451754d719389c2d174c all runs: crashed: general protection fault in open_xa_dir testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 9790a2d2b2155ae9cc358cb028f4e30176dde420630855ab1479bd9e7e1854e2 all runs: crashed: general protection fault in open_xa_dir testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 583b28458b479139a56b8ce178cacefe3a961ee0ddeb203e2e6bbdc9e9371112 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: 0b17cc5a31d7880db0fcc1d1dcdbf12b7bcad74f99568e15f129b24c2dd630be 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: a7c2638497ed549c611bbdfa7e38ce6734e589e6d71de0f03ed70e0ea20ad62a all runs: crashed: general protection fault in open_xa_dir testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 9d83eba4ec1c236367811c021789592cf46ad68130b4d18d465d25ed43e27c38 all runs: crashed: general protection fault in open_xa_dir testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 574d7e88fb1361fde86433029a416e3e4df0a00f9fdcb31925d8db981c8040dc all runs: crashed: general protection fault in open_xa_dir testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 73de62789b57ef60bd23667d6b04116599445e03b9366441619eaed1b82ca210 run #0: crashed: KASAN: null-ptr-deref Read run #1: crashed: general protection fault in open_xa_dir run #2: crashed: general protection fault in open_xa_dir run #3: crashed: general protection fault in open_xa_dir run #4: crashed: general protection fault in open_xa_dir run #5: crashed: general protection fault in open_xa_dir run #6: crashed: general protection fault in open_xa_dir run #7: crashed: general protection fault in open_xa_dir run #8: crashed: general protection fault in open_xa_dir run #9: crashed: general protection fault in open_xa_dir testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 1203c8eb55ebb74fd54a5e338ae5ab34a6473a376ec9be437e15eb731e9474b4 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 25, total time: 3h55m9.497553905s (build: 2h27m17.661556461s, test: 1h24m1.183656706s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5912 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: 1 PID: 5912 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 0000000000000000 ffff8800b597efc8 ffffffff82e18b12 ffffffff85e81040 ffff8800b597f0a0 ffffffff85f2bc00 ffffffff8191bd7b 0000000000000009 ffff8800b597f090 ffffffff8160d884 0000000041b58ab3 ffffffff86b4158a 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