bisecting cause commit starting from d3590ebf6f91350192737dd1d1b219c05277f067
building syzkaller on 233283a191b3c32a48c56928985c8e2cfc004aeb
testing commit d3590ebf6f91350192737dd1d1b219c05277f067 with gcc (GCC) 8.1.0
kernel signature: be5620f572165d2e2fcbf963bb4ccd1ea9bbbe6076ebb858b49a3d20fda8f632
run #0: crashed: BUG: unable to handle kernel paging request in match_subs_info
run #1: crashed: general protection fault in match_subs_info
run #2: crashed: BUG: unable to handle kernel paging request in match_subs_info
run #3: crashed: general protection fault in match_subs_info
run #4: crashed: BUG: unable to handle kernel paging request in match_subs_info
run #5: crashed: general protection fault in match_subs_info
run #6: crashed: general protection fault in match_subs_info
run #7: crashed: INFO: task hung in odev_release
run #8: crashed: INFO: task hung in odev_open
run #9: crashed: INFO: task hung in devtmpfs_submit_req
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0
kernel signature: 67e6a69c064d2d4d5884c71a9656a88671abc997ff31aa97106cf7121872967a
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: cf08e74bad440f36d26cef4da9caef251d579190f12b8ca923a85e140be48d91
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: fc9e4f3465fd76a909856adfae798ee3e976a6c4343d389bb1a33512dbe912c5
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: b589d26d1bb1b4498c02dd8346bcdf9b3541f72a441d8da722b0b33c31811b4c
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 8b540833f6b9a660ead96782a0e6698766085b1f311a691072c7fec4b85f6dc9
run #0: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: c37913db5d195d941ce571ac8f7cd020c384bd673e9c1b0be08717295841d8a8
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: b9a7e796cfce95789c2277d228c11f0c3c5c85ac8945024ff862ca3e888ae169
run #0: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 810db22a2f884c20c98d5783c18f74bf85a262dcb13820a770d46b284a8c209a
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 26016ca8f585f0d62a0f1a3cc1d406c9ae810f175aaf73b84c488624e0347869
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 1a45d92dd37c7cad1b5e51c9356639f0a3277491f9d7678746a17a8d10fc6161
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: b58bbbba42b84c1f0242326a3f11175adbe9c79035ad514cb9b4309a5c05ad17
run #0: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: bcfbcf45d646ab659e7fb14a2fa96fb9f4b845c137957c5164de0fd302c2f061
run #0: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 1ec7b3144483c4b8e0b1dabf785c055bb9639fb0a1ff2014d48d4993ff586b88
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 39677a2c6c7817a3c21a37b2f6240056200adc9406d3a82283964881d8385992
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 388460f97e04490dfcc981a06acdc7df8011baeff9d2bc082fde81685dce4c51
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: ba809f47a39cdd2fb8f0f2e6e7da3906c68b292e81fcb6d08ad46d7924c30553
run #0: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #3: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #4: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #7: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #8: crashed: KASAN: invalid-free in snd_seq_port_disconnect
run #9: crashed: KASAN: invalid-free in snd_seq_port_disconnect
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: bd9fae7e86893c0353aa08034d3c91438908f0b4cb4b3b2b2e6eda68d4ab9eb2
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: 67bdc2006614555b0e838b8582c39ccbbb54eea203a938977d217f4e60fc830b
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: 43f365cec7af34d1b0c63e4cdf8b0c81a2b6b76b668cafd5fcddc16fd4f27402
run #0: crashed: BUG: Double free or freeing an invalid pointer
run #1: crashed: BUG: Double free or freeing an invalid pointer
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: BUG: Double free or freeing an invalid pointer
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: BUG: Double free or freeing an invalid pointer
run #7: crashed: BUG: Double free or freeing an invalid pointer
run #8: crashed: BUG: Double free or freeing an invalid pointer
run #9: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: 95ad5d7fc73424da88dc32004b45df94a60d42baf974a06818f8550e62a7ef7c
run #0: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #1: crashed: BUG: Double free or freeing an invalid pointer
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: BUG: Double free or freeing an invalid pointer
run #4: crashed: BUG: Double free or freeing an invalid pointer
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: BUG: Double free or freeing an invalid pointer
run #7: crashed: BUG: Double free or freeing an invalid pointer
run #8: crashed: BUG: Double free or freeing an invalid pointer
run #9: crashed: BUG: Double free or freeing an invalid pointer
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 33b2bc026bcc1c249a3732269c001cb2253ec591aed3e0a9d86a419ae8610b93
run #0: crashed: BUG: Double free or freeing an invalid pointer
run #1: crashed: BUG: Double free or freeing an invalid pointer
run #2: crashed: BUG: Double free or freeing an invalid pointer
run #3: crashed: BUG: Double free or freeing an invalid pointer
run #4: crashed: BUG: Double free or freeing an invalid pointer
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #7: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #8: crashed: BUG: Double free or freeing an invalid pointer
run #9: crashed: BUG: Double free or freeing an invalid pointer
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: d6f261ddab7ab1fd6db5be67565b8c18fbfc0b07129d22582d5370779f81df8e
run #0: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #1: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #2: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #3: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #4: crashed: kernel BUG at arch/x86/mm/physaddr.c:LINE!
run #5: crashed: KASAN: use-after-free Read in delete_and_unsubscribe_port
run #6: crashed: kernel BUG at arch/x86/mm/physaddr.c:LINE!
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: BUG: spinlock lockup suspected in quarantine_put
run #9: crashed: no output from test machine
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: df8b8d611130c727b31105cfdd7ef336b1df1e1904476ef244f68f93a5dd3bdd
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 3h55m46.192760016s (build: 2h11m29.316153572s, test: 1h39m20.782082078s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
8021q: adding VLAN 0 to HW filter on device bond0
IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5889 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: 1 PID: 5889 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 ffff8800b0c8efc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b0c8f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b0c8f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a
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
 [<ffffffff83531337>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83531337>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff83532378>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff83532478>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff83532478>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d1764>] 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
 [<ffffffff84928557>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff8494cfa8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff8494cfa8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c8eb9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838cfb2f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff8497da5b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84978502>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84afbb22>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff849782d5>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84afa6ba>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84afa6ba>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84afb2eb>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848d77e5>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848d77e5>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848db5da>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848db5da>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b78600>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled