bisecting cause commit starting from e99332e7b4cda6e60f5b5916cf9943a79dbef902
building syzkaller on 8742a2b9dba1ce2869b29fff6c5359cc9116c719
testing commit e99332e7b4cda6e60f5b5916cf9943a79dbef902 with gcc (GCC) 8.1.0
kernel signature: d778933bcd91b8548651e5b01546947172d55f7216bceb52557a7c8860de60ab
all runs: crashed: no output from test machine
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: 00d8f3cbe88078c0931f7df61e41fd1b57aecfe8ac4c1a538525ad3a751a8ee2
all runs: crashed: no output from test machine
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: da69f2bdf2fa8fdbb80eff3acfb646c9fd4c1d13d7d2ea3a0791bf853f59017f
all runs: crashed: no output from test machine
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 191f72502d594a6725cd78d371c3a4dedaec4c4dbbc2b9a638020fca24f9f48a
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 v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 0eed4088366aa59311c0a84379de7b733143c6218614a63b5bc23e7d856e456d
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
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 v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 203368e729e38bf96a61884d121edbd2b4f379905da84fa5a26594e5fc432ed3
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: 1e31fcebfca155d07340a5d46de48de99457edb4e6d80b026bb0409314945c96
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 v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 1d251b3969c83320ab63312725cbd99c2655db1bb887f275fb93decc530e1542
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 v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 30a94fd81ef56f61e9457a7b6316097c2436933c02dcebea8a240075f2865098
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 v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: dba1fca9cc7db6cd84d565883c84aa785de2fa679e60536e72acfcd7357f2437
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: b274fb38faa08f76ed344519e23c4e2af0190ef198168ffb2ad123cd6b8fbbbf
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 v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 7434913182c1a7aba57655c0f28665dd33319ab7db6f1fbb67e39d7551dae6cf
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: 52b5d28b5118f622f61d33ff3188527bb4e38429d9a690bbe7889398cc8fe410
all runs: crashed: unexpected kernel reboot
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 7b907bed8565d1a1c878e748c9a9d3677ec6ad53c7e73dbbc2e013a3cf7a914f
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 v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 20bac222756edd5c106405769bccd6e0064dcd12c31067208a25efa38beb960c
all runs: crashed: unexpected kernel reboot
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: 825d0fe6000260e6924b4336916b91c8c397eb9a3f96d5b833c222a59810c82f
all runs: crashed: unexpected kernel reboot
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: e4d44ce664eb027c2afe54326454d72e3b355cd95038fa01f0efac058a65fc1c
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: 66856aea138a3b289673ae8f5b05976efd2f55045e538984e435147c82c39a40
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: 6d8159ea60078bfe2a2ab6ca5728ec824241c8bf573927b414db0ab0cb017ad6
all runs: crashed: unexpected kernel reboot
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: c05a38e1b5d209b7913074387017eb3a2a945ab080585c1e5e77197b1d3b2ae1
all runs: crashed: unexpected kernel reboot
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: cebfcada8b0aa2662026e2812f0f62e36e91520cead30581bd223186b3532190
all runs: crashed: unexpected kernel reboot
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: 102cb3ddba8326b772371811a554b91913e59df060791dcc6160253e76a318d9
run #0: crashed: general protection fault in rt6_score_route
run #1: crashed: general protection fault in __rb_erase_color
run #2: crashed: INFO: trying to register non-static key in addrconf_verify_rtnl
run #3: crashed: WARNING in timespec_trunc
run #4: crashed: BUG: unable to handle kernel paging request in fib_table_insert
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: INFO: trying to register non-static key in sock_def_write_space
run #8: crashed: WARNING: ODEBUG bug in __do_softirq
run #9: crashed: unexpected kernel reboot
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 95b577dfdc52764df06bf0643cf0358ae263dd51621146a40cbe42ff04d67c02
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 23, total time: 4h17m21.794036812s (build: 2h1m15.327644606s, test: 2h13m23.622542124s)
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: 5866 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: 5866 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800ba32efc8 ffffffff82c65932 ffffffff85c81040
 ffff8800ba32f0a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009
 ffff8800ba32f090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a
Call Trace:
 [<ffffffff82c65932>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c65932>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8160d374>] 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
 [<ffffffff8191b86b>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff8191c0e1>] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff8191c143>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff8191c143>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83530157>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83530157>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff83531198>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff83531298>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff83531298>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d0584>] 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
 [<ffffffff84920687>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849450d8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849450d8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c7cd9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838ce94f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff84975b8b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84970632>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84af3c52>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff84970405>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84af27ea>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84af27ea>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84af341b>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848cf915>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848cf915>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848d370a>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848d370a>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b70740>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled