bisecting cause commit starting from bcf876870b95592b52519ed4aafcf9d95999bc9c
building syzkaller on 196277c4035b5442b7a259953677543566c9b9a9
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0
kernel signature: 015aa6379bce4fd2ab749704397ac80bec3829f64ca5db72046702d0138c5335
run #0: crashed: WARNING: refcount bug in do_enable_set
run #1: crashed: WARNING: refcount bug in do_enable_set
run #2: crashed: WARNING: refcount bug in do_enable_set
run #3: crashed: WARNING: refcount bug in do_enable_set
run #4: crashed: WARNING: refcount bug in do_enable_set
run #5: crashed: WARNING: refcount bug in do_enable_set
run #6: crashed: WARNING: refcount bug in do_enable_set
run #7: crashed: WARNING: refcount bug in do_enable_set
run #8: crashed: WARNING: refcount bug in do_enable_set
run #9: boot failed: can't ssh into the instance
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0
kernel signature: 54e5ea700785b8ecbc6ba5d932625388941c9a3d70d34a623e706f79bf0c5c81
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: WARNING: refcount bug in do_enable_set
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: WARNING: refcount bug in do_enable_set
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: WARNING: refcount bug in do_enable_set
run #8: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #9: crashed: KASAN: use-after-free Write in l2cap_chan_put
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: d670ac57503cbcae52005332999eecc97c61f8cc3ff838c41f7cdf39b4e251b5
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: WARNING: refcount bug in do_enable_set
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: WARNING: refcount bug in do_enable_set
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #9: boot failed: can't ssh into the instance
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: a6a5112ececa0fc12ecf66e851b3f1e2794b1cb595759f87c75c9b8ab77fa5f1
run #0: crashed: WARNING: refcount bug in do_enable_set
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: WARNING: refcount bug in do_enable_set
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: WARNING: refcount bug in do_enable_set
run #5: crashed: WARNING: refcount bug in do_enable_set
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: WARNING: refcount bug in do_enable_set
run #9: crashed: WARNING: refcount bug in do_enable_set
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: cbdb4fa9e8a3b4f0c7fd21720fbb78f02f4bccac66befa613fb8016c9dfc707e
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #7: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 7ace68f008b9d540fb7597a778ba62c935e7d13b21bac3c0b4277a13f8be81a7
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 69289abd03e43f03cb426676aab58d1af4d703f98b9dcd0178a7fbe3c8b9539e
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #7: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #8: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 007ac47c1f6c1690bd5461c0a8fc643b22f578eaf7840c470e7d88cefedec4b9
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #9: OK
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: aaa64a670e58c6e464d770c2946d7f97ac415b4e669d5351c47ae73bfa67a354
run #0: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #1: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: e56d53dcafbf169d1e4860ffe3d2bbd6d779183c3a6a9c0c9831ee611cc3b855
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 7d41e8ebe57bd22de8696cf5c3b525a4e44ffeb3e72eabd77cf60f8388526824
run #0: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: ba9d45d0cacf51c90c40bcb7c8fe6df66c44329e948b085842a4b40b4987240a
run #0: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #9: crashed: KASAN: use-after-free Read in l2cap_chan_close
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 1531ff5f8dd93dab586a1e4bcdfb6ef20e461aa46df97b640d21e3cfff60a893
run #0: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #1: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 42003c9230c6292124b610038f09302997f390d5c2b010e442b896d9090b27c9
run #0: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #3: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #7: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: KASAN: use-after-free Read in l2cap_chan_close
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 30902f959ee46b0f958312574ac893992f8ae18c8eef794f345d5863bd7f36fa
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: kernel BUG at ADDR [verbose debug info unavailable]
run #5: crashed: kernel BUG at ADDR [verbose debug info unavailable]
run #6: crashed: kernel BUG at ADDR [verbose debug info unavailable]
run #7: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #8: crashed: kernel BUG at ADDR [verbose debug info unavailable]
run #9: crashed: kernel BUG at ADDR [verbose debug info unavailable]
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: f0cd0c13ba52732aa6929d0d240a1bedf24288829d19b9234bfdc9a500cf5ecb
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: INFO: task hung in synchronize_rcu
run #2: crashed: INFO: task hung in synchronize_rcu
run #3: crashed: INFO: task hung in synchronize_rcu
run #4: crashed: INFO: task hung in synchronize_rcu
run #5: crashed: INFO: task hung in synchronize_rcu
run #6: crashed: INFO: task hung in synchronize_rcu
run #7: crashed: INFO: task hung in synchronize_rcu
run #8: crashed: INFO: task hung in synchronize_rcu
run #9: crashed: INFO: task hung in synchronize_rcu
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: 0e96fbb0a2a45a69be1d34d6bf4da467df48a1cd65aaf3596f8809d978103a2a
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #6: crashed: INFO: task hung in synchronize_rcu
run #7: crashed: INFO: task hung in synchronize_rcu
run #8: crashed: INFO: task hung in synchronize_rcu
run #9: crashed: INFO: task hung in synchronize_rcu
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 8ef518069b46c8c99ecdf51f74e3cea3b647dbebb0de8c3d3fed0f88ea81bb7d
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: 7829754515dd9c55d48a9b05afe53b2d3d10cac5a94efbfce2000e8edc5ea8e6
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: 46406b4c98a208901f178b3fa0833c961cb6e63e1d26840691184377924ee841
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: e32e533a4a78f8d6d0f00358458836e0eb5100e6d0949a5a33eb20715900ca29
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 5366b2d2f346d8502cadc1b392fa25fe3aa108e6b249f5c389a038dce9f5d2fa
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: unregister_netdevice: waiting for DEV to become free
run #5: crashed: unregister_netdevice: waiting for DEV to become free
run #6: crashed: unregister_netdevice: waiting for DEV to become free
run #7: OK
run #8: OK
run #9: OK
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: 7d2baa5fb44132f6a9c3ad4de70dd907c329a8ec88a7fad085af59f8e228eae5
run #0: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #1: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #2: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #4: crashed: KASAN: use-after-free Read in l2cap_chan_close
run #5: crashed: unregister_netdevice: waiting for DEV to become free
run #6: crashed: unregister_netdevice: waiting for DEV to become free
run #7: OK
run #8: OK
run #9: OK
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 16f471bf07c41c16c00bc7694fd9912934c293fb53ea68494b890a53d2bc9b47
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 4h36m26.182306102s (build: 2h13m14.578629862s, test: 2h19m36.785699941s)
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
bond0: Enslaving bond_slave_0 as an active interface with an up link
IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5890 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: 5890 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
 0000000000000000 ffff8800b2596fc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b25970a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b2597090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a
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
 [<ffffffff84946047>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff8496aa98>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff8496aa98>] 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
 [<ffffffff8499b54b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84995ff2>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84b19612>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff84995dc5>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84b181aa>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84b181aa>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84b18ddb>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848f52d5>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848f52d5>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848f90ca>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848f90ca>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b96100>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled