bisecting cause commit starting from 1b649e0bcae71c118c1333e02249a7510ba7f70a building syzkaller on e8e6c7d21dbd86f502f66737883b1a0c3ae8eeb1 testing commit 1b649e0bcae71c118c1333e02249a7510ba7f70a with gcc (GCC) 8.1.0 kernel signature: ec866d77b2327afdf3ff539c60033fee2f06addf3e1f535a3309ac92ae1c3d18 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: fbbb1e999d3d2f7f9de5e87d809c4f6a578be7e6bc5e5ecf6dca8f0870852929 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 7af9f72e5fa8fff128039b990cf7930cc24b4dafd6ec76a2d289378db0e85903 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 632bc65409ba81708839204b70ac9787329214f8bc5b375eedd7d5232e610edd all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 897c41938132bd076ca56cd3b9d42263133d5bbeb12090a6ac379a140a7b70e8 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: f2fb8b8b4f32ab00b0f195576b0248f86696ca2b47976a6b066cafff0359ab00 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: e3d073d51e4f5d6d2141f23076fa1841d229b9e3651545f3096ac35ed35913f4 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 8d754c76e4ea7696dd9c57d40d61fc2984c7e57a1b617e52484f171d6d99c5bf all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 07d253a0e106d644d858745fe135e04fdfc4f704df2a256ef97bcac5134ee6a0 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 063636973f945ed079a9acd9f6289f3f50b4da605945b1fcb41eda99e3c83147 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 58fbaee630479521b64edbafe4aaf5cfbe28d62cdcf0a59353034d07de7ad381 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 80e0c34fc12286c620ed70fb668bc95d2862eb35be3486c5bacd7f4786e8f8b6 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 638f69f69f14d7bec8c11a6e2f5c49fcfd526857944e674e4e7c85df899eca96 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 93a88f0cf7014e20afed3a6bb4d6539ddd5139c93bb23d35f3b483be814f2424 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: c91ab3777aba1ebfdc51aa2d4539ea92ff44f1c652b04a2e93c25e0760e954a7 all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 536f94507238a6ad82c94e7ddbf6b3fa413b7bbeccd8b3ae3c643d850c4b495f 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: 427a00070f6b1b3692329ac48716c055ef982ac144e70d0c439f322313327285 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: d94a05a50a0cf0e720b48652c190613fe7f1cdcdd2bcc6494cb0a1920bd787da all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 797eaa5188b93d1e0fc42e5be30f25f85fe48bbc38813cd4329c1106801df5cc run #0: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #1: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #2: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #3: crashed: KASAN: slab-out-of-bounds Read in skip_spaces run #4: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #5: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #6: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #7: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #8: crashed: KASAN: slab-out-of-bounds Read in vsscanf run #9: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: bed0f73875d87f669690ee65e588d24321ebc5554e69ae099ccf591353704cad all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: 2cb82289cfdf888f7914ceb359c947b2df1d19f77f1f07a104c26c6127b7193b all runs: crashed: KASAN: slab-out-of-bounds Read in vsscanf testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 2ada9aea1da3ac6e157040299ed831bc85687a5cbfbea778b6b46b6416b65c6b all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 22, total time: 3h10m28.502311138s (build: 1h55m3.122637049s, test: 1h11m27.857663038s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup bond0: Enslaving bond_slave_0 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5893 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: 5893 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 1ffffffff0d95756 ffff8800b9896fb0 ffffffff82c74fc6 ffffffff85c81040 ffff8800b9897088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b9897078 ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xe6/0x120 lib/dump_stack.c:51 [] ? sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] panic+0x1af/0x348 kernel/panic.c:152 [] ? set_ti_thread_flag+0xf/0xf include/linux/thread_info.h:73 [] ? sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] __warn+0x18d/0x1b0 kernel/panic.c:504 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527 [] ? __warn+0x1b0/0x1b0 kernel/panic.c:494 [] ? spin_unlock_irqrestore include/linux/spinlock.h:362 [inline] [] ? kernfs_path_from_node+0x4a/0x60 fs/kernfs/dir.c:234 [] 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_private_init+0x180/0x180 drivers/base/core.c:996 [] ? kfree_const+0x1d/0x20 mm/util.c:35 [] ? kobject_set_name_vargs+0xb4/0x130 lib/kobject.c:285 [] 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 [] ? device_create_vargs+0x20/0x20 drivers/base/core.c:1751 [] ? macvlan_set_mac_address+0x150/0x150 drivers/net/macvlan.c:697 [] 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 [] ? netdev_change_features+0x80/0x80 net/core/dev.c:6801 [] ? trace_kmalloc include/trace/events/kmem.h:45 [inline] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 mm/slab.c:3448 [] ? dev_get_nest_level+0x10c/0x1a0 net/core/dev.c:5974 [] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316 [] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471 [] ? __netlink_ns_capable+0xc7/0xf0 net/netlink/af_netlink.c:783 [] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466 [] ? rtnl_link_ops_get+0x5d/0x90 net/core/rtnetlink.c:284 [] ? rtnl_newlink+0x319/0x1230 net/core/rtnetlink.c:2322 [] ? load_balance+0x990/0x1ea0 kernel/sched/fair.c:7284 [] ? rtnl_setlink+0x2f0/0x2f0 net/core/rtnetlink.c:2067 [] ? debug_check_no_locks_freed+0x3c0/0x3c0 include/linux/sched.h:1954 [] ? __netlink_ns_capable+0xc7/0xf0 net/netlink/af_netlink.c:783 [] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513 [] ? memset+0x28/0x30 mm/kasan/kasan.c:303 [] ? rtnetlink_rcv+0x30/0x30 net/core/rtnetlink.c:3521 [] ? __mutex_lock_common kernel/locking/mutex.c:601 [inline] [] ? mutex_lock_nested+0x638/0xb30 kernel/locking/mutex.c:618 [] ? rtnl_lock net/core/rtnetlink.c:70 [inline] [] ? rtnetlink_rcv+0x16/0x30 net/core/rtnetlink.c:3518 [] ? rcu_read_lock include/linux/rcupdate.h:871 [inline] [] ? netlink_lookup+0xd4/0x630 net/netlink/af_netlink.c:457 [] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277 [] ? rtnetlink_rcv+0x30/0x30 net/core/rtnetlink.c:3521 [] 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_deliver_tap_kernel net/netlink/af_netlink.c:275 [inline] [] ? netlink_unicast_kernel net/netlink/af_netlink.c:1213 [inline] [] ? netlink_unicast+0x3b5/0x660 net/netlink/af_netlink.c:1240 [] ? netlink_attachskb+0x730/0x730 include/linux/sched.h:2918 [] netlink_sendmsg+0x893/0xb40 net/netlink/af_netlink.c:1786 [] ? netlink_unicast+0x660/0x660 include/net/sock.h:1975 [] ? __might_fault+0xf1/0x1b0 mm/memory.c:3876 [] ? security_socket_sendmsg+0x6a/0xa0 security/security.c:1238 [] ? netlink_unicast+0x660/0x660 include/net/sock.h:1975 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xb5/0xf0 net/socket.c:622 [] SYSC_sendto+0x1c9/0x300 net/socket.c:1648 [] ? SYSC_connect+0x2a0/0x2a0 net/socket.c:1540 [] ? mnt_get_count+0x1c0/0x1c0 fs/namespace.c:184 [] ? rcu_read_unlock include/linux/rcupdate.h:922 [inline] [] ? mntput_no_expire+0xb1/0x600 fs/namespace.c:1095 [] ? rcu_lock_release include/linux/rcupdate.h:491 [inline] [] ? rcu_read_unlock include/linux/rcupdate.h:926 [inline] [] ? mntput_no_expire+0xce/0x600 fs/namespace.c:1095 [] ? mnt_get_count+0x1c0/0x1c0 fs/namespace.c:184 [] ? mntput+0x52/0x70 fs/namespace.c:1143 [] ? ___might_sleep+0x331/0x440 kernel/sched/core.c:7435 [] ? trace_hardirqs_off+0xd/0x10 kernel/locking/lockdep.c:2772 [] ? exit_to_usermode_loop+0xcb/0x1c0 arch/x86/entry/common.c:240 [] ? trace_hardirqs_on_thunk+0x1b/0x1d [] SyS_sendto+0x9/0x10 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled