bisecting cause commit starting from 359c92c02bfae1a6f1e8e37c298e518fd256642c building syzkaller on a75b198cd071926905c294db80393240f55a9a0f testing commit 359c92c02bfae1a6f1e8e37c298e518fd256642c with gcc (GCC) 8.1.0 kernel signature: abe1bfc17861cee36fef0d169af90cb141006a4d918fb924c0d1a6b57e9758a3 all runs: crashed: general protection fault in fbcon_cursor testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 7e9f859fa4db41bf8c62e1a061c4f177e90d327769ea199440bc21615015325f all runs: crashed: general protection fault in fbcon_cursor testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 5f51a23cd255d159cb3466c578bfe69430896f1d6b93dc8386a51a94f33dfaa4 all runs: crashed: general protection fault in fbcon_cursor testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 01e514002f2ed606429538a07e85f19a7dbf2177a2b8e89d9dca18ec67a643dd all runs: crashed: general protection fault in fbcon_cursor testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 4133042b5ac342081ad144d370caed28cc9cce01a295fddf3775dc80cc390b95 all runs: crashed: general protection fault in fbcon_cursor testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 08c8dab661782702a0da82350baea0917ca92677fda75eb35fc9e118a3dfe3ed all runs: crashed: general protection fault in fbcon_cursor testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 03b338e39594aeee9f75765f43916eea7a25082b9950a3fc4e5793593cdd2548 all runs: crashed: general protection fault in fbcon_cursor testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 7650a982f3132b0e60f47fe831ea84af4efb189fabe2776ed94e2031e8205915 all runs: crashed: general protection fault in fbcon_cursor testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: b7ac48b0a94baeed1cb277ed04d823c41288759db1f9f4885394663fed8614c7 all runs: crashed: general protection fault in fbcon_cursor testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 320c93cd8652a3c80db7749cab7ba857f48e6ef79d703a5362ea6f25e1efa633 all runs: crashed: general protection fault in fbcon_cursor testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 683195407587bfbd48b5385b9ad23c3258c9f7d71814724edb56307d8deb9039 all runs: crashed: general protection fault in fbcon_cursor testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 0b2546f78773616676395c3140c00de9001511958f78695458baafe668b8abd7 all runs: crashed: general protection fault in fbcon_cursor testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 324d884bb5a4207ad7688aa55f65e4aa0d3c0155ad73f7eac1092a4e39ee993e all runs: crashed: general protection fault in fbcon_cursor testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: e4f44a3d4c8d5ac83fbbfc19ebc1caddff7d49ec4b4304e73e68b1e380177c07 all runs: crashed: general protection fault in fbcon_cursor testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 1291ce09254500f9278f3f00c38733d7fb0a8488c48f7991346b10b8f6c25acf all runs: crashed: general protection fault in fbcon_cursor testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 2082eb179a3afebf663adf951892a1015f53f6070ebe6b873b0dff70526e3949 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: 58484dc8c6b2913fd9874099a2e1d3ab6f03a09e494cb7653f542fc12678b94c 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: 0a1344187f9d90a62c366b64e14a8aaa281235160284881ac4f50dc4ccf0f5f6 all runs: crashed: general protection fault in do_update_region testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 85a7ef8c5f101a8327c05477ce571ea51e2f35c545fc6929a7e4a198400cb296 all runs: crashed: general protection fault in do_update_region testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 29721c4499527dd6331006b09c3464688619d19b1bf1edcfd8864aa993df4a2f all runs: crashed: general protection fault in do_update_region testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: d1b68e5cd7590b82afce0443005fb7f6cbd8bbd2384ff4779c10140dcad17749 all runs: crashed: general protection fault in do_update_region testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: c72b465847897551ab6393a619880b660d6dafb38134e67334bf6330ba3235a9 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 22, total time: 3h19m26.316815722s (build: 2h1m51.961891543s, test: 1h14m35.799030345s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready bond0: Enslaving bond_slave_0 as an active interface with an up link ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7101 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: 7101 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 1ffffffff0d95756 ffff8800b77befb0 ffffffff82c74fc6 ffffffff85c81040 ffff8800b77bf088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b77bf078 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