bisecting cause commit starting from 63623fd44972d1ed2bfb6e0fb631dfcf547fd1e7
building syzkaller on c88c7b75a4e022b758f4b0f1bf3db8ebb2fb25e6
testing commit 63623fd44972d1ed2bfb6e0fb631dfcf547fd1e7 with gcc (GCC) 8.1.0
kernel signature: 3b70dae25f12a5cfecb9bf7e40b728433cdbba6cb6fde8b2f9f43924676f12e9
run #0: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in __init_work
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: KASAN: use-after-free Read in route4_get
run #5: crashed: KASAN: use-after-free Read in route4_get
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 71d7133001ff0045a13bab68c60f900e14c5fc3aff83d4a49bb326a73d144392
run #0: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #5: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #6: crashed: KASAN: use-after-free Read in route4_get
run #7: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: b3dd525c75da5060b729849cff80b5854d376530a18203107be4b2649a7720e4
all runs: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 21d028934117f61ab2cc562910671176dbf1d79153d685c35565b622c651c63c
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #5: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: a9bce48d3a5209fd5435f0905858b38df098305345d4d2c43b69f6cc4c5e6487
run #0: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: KASAN: use-after-free Read in route4_get
run #5: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 8f27e1a3e51a567657ecb456ee57f10cf5b146f4b7818f441deb8bbe4aa11105
all runs: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 797a02bd0424e40921ee96f8b626ad973615f02f765cadbc1778598b558443d3
run #0: crashed: WARNING: locking bug in corrupted
run #1: crashed: WARNING: ODEBUG bug in corrupted
run #2: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #3: crashed: WARNING: locking bug in corrupted
run #4: crashed: WARNING: locking bug in corrupted
run #5: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: locking bug in corrupted
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: cca9272df1371d7b5a8d9a535d0215e7e59ee45298064de57fcaa7184d63645e
run #0: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in corrupted
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #5: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #6: crashed: WARNING: ODEBUG bug in __init_work
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: a327d465f9fdceafd9adf11f0ff3d241fee7e468c9e5ad7100dbaebd431fc873
run #0: crashed: WARNING: ODEBUG bug in __init_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #5: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: 5420e462012b6ee5f1cd194573d631dca19fc77d2cb4b6156b8aa6bf738d55d6
run #0: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #3: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #4: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #5: crashed: KASAN: use-after-free Read in route4_get
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: a5af2f8c59abae1cf90181caef6c11949484cd83481136c76fb8674cb0b4919f
all runs: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: a4e6ddd7e5691423b457e53f1e35eb910befef260cbd53845f9ccd94109c01e3
run #0: crashed: WARNING: ODEBUG bug in __route4_delete_filter
run #1: crashed: WARNING: ODEBUG bug in route4_change
run #2: crashed: WARNING: ODEBUG bug in route4_change
run #3: crashed: WARNING: ODEBUG bug in route4_change
run #4: crashed: WARNING: ODEBUG bug in route4_change
run #5: crashed: WARNING: ODEBUG bug in route4_change
run #6: crashed: WARNING: ODEBUG bug in route4_change
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: ODEBUG bug in route4_change
run #9: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: a67c1a290a621131212d8297385f6096ec3eb9a90e4c10b0527a58bebeaf4c7d
run #0: crashed: WARNING: ODEBUG bug in route4_change
run #1: crashed: WARNING: ODEBUG bug in route4_change
run #2: crashed: KASAN: use-after-free Read in route4_get
run #3: crashed: KASAN: use-after-free Read in route4_get
run #4: crashed: WARNING: ODEBUG bug in __route4_delete_filter
run #5: crashed: KASAN: use-after-free Read in route4_get
run #6: crashed: WARNING: ODEBUG bug in route4_change
run #7: crashed: WARNING: ODEBUG bug in route4_change
run #8: crashed: WARNING: ODEBUG bug in route4_change
run #9: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 9a057338447825db7a805ce542e011adf1c8a3082d4825a53f9a07e1dfdd95bd
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: KASAN: use-after-free Read in route4_get
run #2: crashed: WARNING: ODEBUG bug in route4_change
run #3: crashed: WARNING: ODEBUG bug in route4_change
run #4: crashed: KASAN: use-after-free Read in route4_get
run #5: crashed: WARNING: ODEBUG bug in route4_change
run #6: crashed: WARNING: ODEBUG bug in route4_change
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: ODEBUG bug in route4_change
run #9: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: e8d824452a05cae7a2bf45fa57361738cc7089230d21ce50caae5e06c79a4702
run #0: crashed: WARNING: ODEBUG bug in route4_change
run #1: crashed: WARNING: ODEBUG bug in route4_change
run #2: crashed: KASAN: use-after-free Read in route4_get
run #3: crashed: KASAN: use-after-free Read in route4_get
run #4: crashed: WARNING: ODEBUG bug in route4_change
run #5: crashed: WARNING: ODEBUG bug in route4_change
run #6: crashed: KASAN: use-after-free Read in route4_get
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: ODEBUG bug in route4_change
run #9: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 6ac49865fd0e8f98de4c2e09ffc90b44d3431455e5bdfa9971a9edb9d540a618
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: d380f3cecd2abd1cc6d9aaef6b68b48873f9f0a62e0979ae036b8a7d82866210
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: 71aabc0b3dd5702bfdfaa47e8639bb3cef2a5ec19a819f26753fab7153b257bc
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: KASAN: use-after-free Read in route4_get
run #2: crashed: WARNING: ODEBUG bug in route4_change
run #3: crashed: WARNING: ODEBUG bug in route4_change
run #4: crashed: WARNING: ODEBUG bug in route4_change
run #5: crashed: WARNING: ODEBUG bug in route4_change
run #6: crashed: WARNING: ODEBUG bug in route4_change
run #7: crashed: WARNING: ODEBUG bug in route4_change
run #8: crashed: KASAN: use-after-free Read in route4_get
run #9: crashed: KASAN: use-after-free Read in route4_get
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: 06b96d06e1b13ec1696de477202247920c8dc3d54b045e121634325cf940347c
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: KASAN: use-after-free Read in route4_get
run #2: crashed: KASAN: use-after-free Read in route4_get
run #3: crashed: WARNING: ODEBUG bug in route4_change
run #4: crashed: WARNING: ODEBUG bug in route4_change
run #5: crashed: KASAN: use-after-free Read in route4_get
run #6: crashed: KASAN: use-after-free Read in route4_get
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: KASAN: use-after-free Read in route4_get
run #9: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 806c4ca60edce8b5cbb8bf2f6c301d1ab9d214add28d04f464378680ef5471d3
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: KASAN: use-after-free Read in route4_get
run #2: crashed: WARNING: ODEBUG bug in route4_change
run #3: crashed: KASAN: use-after-free Read in route4_get
run #4: crashed: WARNING: ODEBUG bug in route4_change
run #5: crashed: KASAN: use-after-free Read in route4_get
run #6: crashed: KASAN: use-after-free Read in route4_get
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: KASAN: use-after-free Read in route4_get
run #9: crashed: WARNING: ODEBUG bug in route4_change
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: f167364a9101ee76533983014f27ab8bbd7fae77fc8fc0125936e7bc2605c273
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: WARNING: ODEBUG bug in route4_change
run #2: crashed: WARNING: ODEBUG bug in route4_change
run #3: crashed: KASAN: use-after-free Read in route4_get
run #4: crashed: KASAN: use-after-free Read in route4_get
run #5: crashed: KASAN: use-after-free Read in route4_get
run #6: crashed: KASAN: use-after-free Read in route4_get
run #7: crashed: KASAN: use-after-free Read in route4_get
run #8: crashed: WARNING: ODEBUG bug in route4_change
run #9: crashed: KASAN: use-after-free Read in route4_get
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 4e2aa375f1f355320e1054b7ae2feea91bc776058033b8aac30b7228cb0cd542
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 22, total time: 3h26m10.676650368s (build: 1h58m58.556998462s, test: 1h24m40.362217505s)
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): bridge0: link is not ready
bond0: Enslaving bond_slave_0 as an active interface with an up link
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7437 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: 7437 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
 1ffffffff0d95756 ffff8800b4d06fb0 ffffffff82c74fc6 ffffffff85c81040
 ffff8800b4d07088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b4d07078
 ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f
Call Trace:
 [<ffffffff82c74fc6>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c74fc6>] dump_stack+0xe6/0x120 lib/dump_stack.c:51
 [<ffffffff8160cf4e>] panic+0x1af/0x348 kernel/panic.c:152
 [<ffffffff8133960d>] __warn+0x18d/0x1b0 kernel/panic.c:504
 [<ffffffff813396c2>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527
 [<ffffffff81922ccb>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff81923561>] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff819235c3>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff819235c3>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83547c79>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83547c79>] device_add+0x689/0x1360 drivers/base/core.c:1086
 [<ffffffff83548cb8>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff83548db8>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff83548db8>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838e7554>] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298
 [<ffffffff8139f90b>] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93
 [<ffffffff8139fa11>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff8139fa11>] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401
 [<ffffffff84942177>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff84967eca>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff84967eca>] register_netdevice+0x88a/0xce0 net/core/dev.c:7027
 [<ffffffff838e02a9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838e610f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff8499522b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff849905d2>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84b1a1b2>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff849903a5>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84b18db5>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84b18db5>] netlink_unicast+0x455/0x660 net/netlink/af_netlink.c:1240
 [<ffffffff84b19853>] netlink_sendmsg+0x893/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848f20f5>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848f20f5>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848f30c9>] SYSC_sendto+0x1c9/0x300 net/socket.c:1648
 [<ffffffff848f53b9>] SyS_sendto+0x9/0x10 net/socket.c:1616
 [<ffffffff85b9bf00>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled