bisecting cause commit starting from e6e6ec48dd0fa12e8a2d1ff6b55cd907401bd7fe building syzkaller on d850e9d08467726cd94b6a9caaf8090c594721ba testing commit e6e6ec48dd0fa12e8a2d1ff6b55cd907401bd7fe with gcc (GCC) 8.1.0 kernel signature: 5fa1c484d8047663bd4008a2f035011dd24a82f2f2446a3da4c0b4910dcfbfe5 run #0: crashed: KASAN: out-of-bounds Read in kvm_vm_ioctl_unregister_coalesced_mmio run #1: crashed: no output from test machine run #2: crashed: no output from test machine run #3: crashed: no output from test machine run #4: crashed: no output from test machine run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: e655df9dc6cfa423654515d966c19ee90759c4289ccdfe690f8248e9db290590 run #0: crashed: KASAN: out-of-bounds Read in kvm_mmu_free_roots run #1: crashed: no output from test machine run #2: crashed: no output from test machine run #3: crashed: no output from test machine run #4: crashed: no output from test machine run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 1c2fd55e963cea5d0bd63690637c6ab29474a87390f6cfcead8a64da348e029b run #0: crashed: KASAN: out-of-bounds Read in bts_update run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: unexpected kernel reboot run #7: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor477189514" "root@10.128.10.30:./syz-executor477189514"]: exit status 1 ssh: connect to host 10.128.10.30 port 22: Connection timed out lost connection run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: fe14146893d67cd0625212f8254e8acd46f54ed90e8f71c247ae32431961185c all runs: crashed: unexpected kernel reboot testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 70950d2c7db74fd9768e9123cbaa3c4085eb0fe16236ab2b2ba9dd6f1ce4d2a7 all runs: crashed: unexpected kernel reboot testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: dd0265f41f64ceaec2b66e560d4f28917e4a544d41ac645cb3c6a132fe20c568 run #0: crashed: unexpected kernel reboot run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: unexpected kernel reboot run #7: crashed: unexpected kernel reboot run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 956056852269ea313d0afcb1e40f3c944e2ca5f3fa23feb5c4d21c16e9cc1698 all runs: crashed: unexpected kernel reboot testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: f911e3b4c73b049986f5bea3a1e992c940830b482f0062ae6e464f29b0c30bf2 run #0: crashed: unexpected kernel reboot run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: unexpected kernel reboot run #7: crashed: unexpected kernel reboot run #8: crashed: unexpected kernel reboot run #9: crashed: no output from test machine testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 34df9f7a4be7cd0b00b1f9ae0a8be79b62789e2b1c9cb9110b9c02e415eccb5e run #0: crashed: unexpected kernel reboot run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: unexpected kernel reboot run #7: crashed: unexpected kernel reboot run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 6de584aa2f6433aff3dba5a5aaec5497754c2c2ff9dfe47e73631a9734a11ef2 all runs: crashed: unexpected kernel reboot testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 020ac611cd9a74e3d055169da283427508e90bffbc0357ec9be7fdf2c54dfe6f run #0: crashed: unexpected kernel reboot run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: unexpected kernel reboot run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 0a4613381523edc9931acce7f9ba4d549dd2e6f2bd21a32c168e31c056bc14da all runs: crashed: unexpected kernel reboot testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 57084f0a6b2354a8b7bbee500785639b9b272b41f7d32e1d6664f91e21a3f599 all runs: crashed: unexpected kernel reboot testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 23114f7bf7167625a3a1dfe1d2d7a8fbe68a0e504b86c7c061d5e63648a6654a all runs: crashed: unexpected kernel reboot testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 0ffd21545f24b1b7ba8d09beaf1d928d16a1d96dc2212eba18923f176abc7262 all runs: crashed: unexpected kernel reboot testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: cc6fe756833bdae1f736dc3485a9139035c8622b2af20453fdc776b201d9545d 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: 7629f138c1339fbe0f50523e36eae1b1e78358268d191c83849c3df4161c86bd 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: baf65704f804d2d13cacd266da341856152971d9220f44e1761b265e8230398d run #0: crashed: unexpected kernel reboot run #1: crashed: unexpected kernel reboot run #2: crashed: unexpected kernel reboot run #3: crashed: unexpected kernel reboot run #4: crashed: unexpected kernel reboot run #5: crashed: unexpected kernel reboot run #6: crashed: unexpected kernel reboot run #7: crashed: unexpected kernel reboot run #8: crashed: unexpected kernel reboot run #9: crashed: no output from test machine testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 29c492a1eeb5aebb56f3b9f50f24fec1bdf14889b28dc31fed1e1c9aa43ff78f all runs: crashed: unexpected kernel reboot testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: 47b5b8defcec3cc66077b6842c6f97a9a5e083a9c8b2347db143360072a4141d all runs: crashed: unexpected kernel reboot testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 95abcdf4e6b6cc543533b845505d2335f2fbad8c171f79b37bba4d5ce085675c run #0: crashed: general protection fault in getname_kernel run #1: crashed: general protection fault in ext4_release_file run #2: crashed: general protection fault in irqtime_account_process_tick run #3: crashed: INFO: trying to register non-static key in addrconf_verify_rtnl run #4: crashed: general protection fault in __rb_insert_augmented run #5: crashed: general protection fault in __skb_try_recv_datagram run #6: crashed: unexpected kernel reboot run #7: crashed: INFO: trying to register non-static key in inode_doinit_with_dentry run #8: crashed: general protection fault in fib6_walk_continue run #9: crashed: unexpected kernel reboot testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 786ecb4752454b7fa375a43f290992ee3770311e6d9ff615b5f48921e543b815 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 22, total time: 3h55m38.079089782s (build: 1h55m46.191131031s, test: 1h57m24.740212156s) 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 blocking state bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7766 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: 7766 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 1ffffffff0d95756 ffff8800b163efb0 ffffffff82c74fc6 ffffffff85c81040 ffff8800b163f088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b163f078 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