bisecting cause commit starting from 7ae77150d94d3b535c7b85e6b3647113095e79bf
building syzkaller on bc258b506da8ceda014bf1d40d695d1890e9f785
testing commit 7ae77150d94d3b535c7b85e6b3647113095e79bf with gcc (GCC) 8.1.0
kernel signature: f892f83e9f84c3395d6257ef8d6bf9c577c02b57bd4b06bfa4599b10051336f4
all runs: crashed: no output from test machine
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0
kernel signature: 69152f1ac0a88ba3de33023477d31efd74ccf7ad04220130ed7c1e8ef0252ee1
all runs: crashed: no output from test machine
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: 807577880568d95191bdf296bb9eceef8f8832ea8269a9ac0b68036b99ee14ba
all runs: crashed: no output from test machine
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 2b1f40db93cb567e8ba3ad6eeb418206aa042a6232fd7b00d73798ea181f6b7f
all runs: crashed: no output from test machine
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 5332a6e4668319f49bb0608469cf4e076cb27dd934ac6d3a0f6d8ace18dfcb51
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: 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 v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: bf64a9191e6fec42977b232ba2b53b27651cbbf590f59d9a42090d366e4b1509
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: 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 v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 992bc2e4fe4575559bc21f068dcca5d3f85c06c8ed76ac9e669e9902955f5240
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: 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 v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 7ee7da80f574e06d66256595fd050ad28c0c9210f5a2c03836711a5cf60b305f
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
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 v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 1b9b1470451b8a7141af8c57202857b53d42947e6c3c5ab30eecb7de0e0d7b30
all runs: crashed: unexpected kernel reboot
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 2dbb0e68310ad6202ddc0afc4dc3111a6a74862f6b9e4d41ef34abb52e6e82a6
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: 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 v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: b236224f3ca6cc34acbccfd45e87f0ecba8f0d74a8436a22d370a5c22001dab6
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: 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 v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: af14424a66d85e3f51f04bfb3b2482f2d365c65bc644de48bdbe1701cec33fdc
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 v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 77431f3294f0a4f921349316f077e1e2956f4a23f2660c121d42a91e117ff8a3
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: 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 v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 6461f2685473a32264d40992c04b822e0a2400202b4350fc2c02c423b2698619
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 v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: ef4b95430bcc3c510354aac7ca9dbea1b22611a4c28f451cce95846c3badf874
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 v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: e02d103a9b66f040a838d2d4f41d6aba6d3338fc7554b83735897f284a9dca57
all runs: crashed: unexpected kernel reboot
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: 523d6503d148fda00fd61434d6817d86a97a0528e6d851a701d183dbee9f0862
all runs: crashed: unexpected kernel reboot
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 85a0ed6f51f07b684f983779e1b13dbf492606c13f658bdfa4a05395da9efbb9
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: 30404b3a69ddb159ba35473c7cc10a4d50f363e2554dbe28da94c3589d75505e
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: 126aafe146b03e2aa4b48ec25620b70053d57eb51ebfb5204d7ab6ab068f1e65
all runs: crashed: unexpected kernel reboot
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: c3613ca64ee419c6378b970589faf55dc8812bfa541a83d270f6b08d74fa0c14
all runs: crashed: unexpected kernel reboot
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 446e805d1d3ffcb4326714c72cb0a2c470348da1ef27141e632f3e46c606dc85
all runs: crashed: unexpected kernel reboot
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: dac62ccdf398c1c5ad1c1449a05e6974e17270e70097f732f3241c64541a9a51
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: general protection fault in unlink_anon_vmas
run #5: crashed: general protection fault in __blkdev_put
run #6: crashed: BUG: unable to handle kernel paging request in cpuacct_charge
run #7: crashed: unexpected kernel reboot
run #8: crashed: general protection fault in ipv6_get_ifaddr
run #9: crashed: unexpected kernel reboot
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 08d720300c61316b033055a6d0a1e470c069bdd8c31d7256ea5a0eecd45b91fd
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 4h51m28.844997182s (build: 2h15m5.666850034s, test: 2h30m57.29496023s)
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 disabled state
device bridge_slave_1 entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5888 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: 5888 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
 0000000000000000 ffff8800b1d96fc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b1d970a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b1d97090 ffffffff8160d884 0000000041b58ab3 ffffffff868f05e2
Call Trace:
 [<ffffffff82c65e52>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c65e52>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8160d884>] panic+0x1af/0x348 kernel/panic.c:152
 [<ffffffff81335ecd>] __warn+0x18d/0x1b0 kernel/panic.c:504
 [<ffffffff81335f82>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527
 [<ffffffff8191bd7b>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff8191c5f1>] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff8191c653>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff8191c653>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83530677>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83530677>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff835316b8>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff835317b8>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff835317b8>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d0aa4>] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298
 [<ffffffff81399feb>] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93
 [<ffffffff8139a0f1>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff8139a0f1>] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401
 [<ffffffff84920ba7>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849455f8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849455f8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c81f9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838cee6f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff849760ab>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84970b52>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84af4172>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff84970925>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84af2d0a>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84af2d0a>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84af393b>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848cfe35>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848cfe35>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848d3c2a>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848d3c2a>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b70c40>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled