bisecting cause commit starting from 171d4ff79f965c1f164705ef0aaea102a6ad238b building syzkaller on 54289b0835634ca07a8117613c48b73e9e647d13 testing commit 171d4ff79f965c1f164705ef0aaea102a6ad238b with gcc (GCC) 8.1.0 kernel signature: 2eebe023bffe6a3f3f5f9af5d494d9951f52df0a8bdf0f1b2fa37fbde91d17cb all runs: crashed: UBSAN: array-index-out-of-bounds in ieee80211_del_key testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: 5d43e334571608d946b4f4f6f695cdee9db5f2e7daa1044c9a0c5a04cf2df910 all runs: crashed: UBSAN: array-index-out-of-bounds in ieee80211_del_key testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: c4fb5fdbe40c9d245a2512b5bbb55772a55d585195f11e71ce4ed0ee0f59b51e all runs: crashed: UBSAN: array-index-out-of-bounds in ieee80211_del_key testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: ebeabc43849f429ef4cad88f5dfa43afc7dbe021cdf4980775563919c95fa7a9 all runs: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: a792d216d753e05639685c27098da9f71eca1a1a4823aae7b83e86188c0804df all runs: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: c951a3a40173128c25c1bfaca47a2a475049c0e506bfc1d53bb3cebab6fc763b all runs: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: e3b09fb5ca6bf28faa6752d917cb8bcc641d6756cc95a8584a3d6e25deb59fc4 all runs: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: ffeba673dbd2a8830f34d645d0d2932154c2eaa11498d82ce46daf4315406669 all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 17cdc8be8332b3414b88d95be72663c3067be27082cf3589275f2b2c70723b77 all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 788b18fbd9c183c0a7bfcdda1b486916d20caf618137205dd1760c7f57d57398 run #0: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #1: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #2: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #3: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #4: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #5: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #6: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #7: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #8: crashed: UBSAN: undefined-behaviour in ieee80211_del_key run #9: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: c89b36c469f587b3801ba7f734d3a617e35049305086fe0fa4cb7f573d5710b0 run #0: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #1: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #2: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #3: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #4: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #5: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #6: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #7: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #8: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset run #9: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: f92364565e965b7b741aab1f6c2610da1b7605ada5fe7f34e38c089b419ba371 all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 0522ef87dcba3f10db70884c3544c9dc9c8a19ca7ff25be69f71df5a094dd056 all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 450cff4b549ffb91d1529e0a61a95f80a4f5a7e04bb889e73201740c89adfb5b all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 15c6ae13680e43fc6ac9ee859723ae91eba2f639ef66a2809584d70027ab7db9 all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_vq_reset testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 ./arch/x86/include/asm/bootparam_utils.h:37: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:39: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:42: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:45: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:48: undefined reference to `__ubsan_handle_type_mismatch_v1' testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 ./arch/x86/include/asm/bootparam_utils.h:37: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:39: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:42: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:45: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:48: undefined reference to `__ubsan_handle_type_mismatch_v1' testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 ./arch/x86/include/asm/bootparam_utils.h:36: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:38: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:41: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:44: undefined reference to `__ubsan_handle_type_mismatch_v1' ./arch/x86/include/asm/bootparam_utils.h:47: undefined reference to `__ubsan_handle_type_mismatch_v1' testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 arch/x86/entry/common.c:173: undefined reference to `__ubsan_handle_type_mismatch_v1' ./include/linux/compiler.h:254: undefined reference to `__ubsan_handle_type_mismatch_v1' ./include/linux/tracehook.h:190: undefined reference to `__ubsan_handle_type_mismatch_v1' ./include/linux/thread_info.h:60: undefined reference to `__ubsan_handle_type_mismatch_v1' ./include/trace/events/syscalls.h:17: undefined reference to `__ubsan_handle_type_mismatch_v1' testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: 2f6b2a7320d39d9212bfca4215bf830b751250a30503404ea5e14f93fdf2a01a all runs: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: 920edc3926b46c78643cc07e0820ff60e8198de55c3fa7a5b3710a602ab8dac2 run #0: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #1: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #2: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #3: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #4: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #5: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #6: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #7: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #8: basic kernel testing failed: UBSAN: undefined-behaviour in vhost_init_is_le run #9: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 33f702b7a07e867e0d1a67ddf1905c02dba162cdc83d837aeba0d81d1fff5bae all runs: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: e4acd648f94c8d90a71847e9b7072ae6ef9be863ebce3e99511abf2406785607 all runs: crashed: UBSAN: undefined-behaviour in ieee80211_del_key testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 7490fc364c85b9d4b526f39e470c45364d53ab7b2fddfa73b1ab20f4aeadbbf4 run #0: crashed: UBSAN: undefined-behaviour in ip_idents_reserve run #1: crashed: UBSAN: undefined-behaviour in ip_idents_reserve run #2: crashed: UBSAN: undefined-behaviour in ip_idents_reserve run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 7d3e804cdf966734b99f5172d1b9085ea5ce0f89aa645733b8e552612df7ae32 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 25, total time: 3h41m5.01271412s (build: 2h28m39.465335591s, test: 1h8m4.127519338s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5901 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: 5901 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ffff8800b99eeef0 ffffffff836c94e1 1ffffffff11345ba 0000000041b58ab3 ffffffff882802cf ffffffff836c9324 ffff8800b99eeeb0 0000000000000000 ffff8800b99eeeb8 ffffffff81586869 0000000000000562 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x1bd/0x29c lib/dump_stack.c:51 [] panic+0x1bb/0x44a kernel/panic.c:152 [] __warn+0x194/0x1d0 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+0xeb/0x110 fs/sysfs/symlink.c:51 [] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] [] sysfs_create_link+0x3f/0xb0 fs/sysfs/symlink.c:92 [] device_add_class_symlinks drivers/base/core.c:891 [inline] [] device_add+0x47c/0x15d0 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+0x228/0x350 drivers/net/macvtap.c:1298 [] notifier_call_chain+0xac/0x280 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+0x4c/0x90 net/core/dev.c:1643 [] call_netdevice_notifiers net/core/dev.c:1659 [inline] [] register_netdevice+0x9d7/0x1310 net/core/dev.c:7027 [] macvlan_common_newlink+0xa15/0x1720 drivers/net/macvlan.c:1316 [] macvtap_newlink+0x128/0x230 drivers/net/macvtap.c:471 [] rtnl_newlink+0xe5e/0x1780 net/core/rtnetlink.c:2466 [] rtnetlink_rcv_msg+0x22b/0xc20 net/core/rtnetlink.c:3513 [] netlink_rcv_skb+0x1bb/0x2c0 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+0x419/0x630 net/netlink/af_netlink.c:1240 [] netlink_sendmsg+0x9a3/0xeb0 net/netlink/af_netlink.c:1786 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xdd/0x160 net/socket.c:622 [] SYSC_sendto net/socket.c:1648 [inline] [] SyS_sendto+0x1dd/0x2d0 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled