bisecting cause commit starting from 63623fd44972d1ed2bfb6e0fb631dfcf547fd1e7
building syzkaller on c88c7b75a4e022b758f4b0f1bf3db8ebb2fb25e6
testing commit 63623fd44972d1ed2bfb6e0fb631dfcf547fd1e7 with gcc (GCC) 8.1.0
kernel signature: fe11d8d8dab72867fdbe75e5177b85fd61bd199c90336594392fc32e77a5b560
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: 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 __init_work
run #7: crashed: WARNING: ODEBUG bug in __init_work
run #8: crashed: KASAN: use-after-free Read in route4_get
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: 43e1d8accced50c09a2f77a2cf44b98736634c504d6ff90e92b93c0cac1512ce
all runs: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 488654bd8f2bf5a7ffee7fc1893866e716954879f5331f7dfb1f49e4bf8ba784
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: e96500a64ac4bab82f55b33b0ce3cf6fb0eeeeb6b021f7a54daa4e1a1515a236
all runs: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 825f6cda97ced59001aed5ac0aa659ccb4dbea4beb3bac0fba154b49f09cf314
all runs: crashed: WARNING: ODEBUG bug in tcf_queue_work
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 133791dd19417c11411bebffa641ea32ef308a5be4ad68dd163950e228e2d401
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: aeb18f61e9bfe6d9b916d5f69020f4d52ef585e7c9ebdc0a0f77567e1912c733
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 corrupted
run #3: crashed: WARNING: ODEBUG bug in __init_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: locking bug in corrupted
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
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: 58fa93aa7b81b5be2c790e6118e73a462b2d905b5c1c3684812f1709f6418b1a
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 corrupted
run #6: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #7: crashed: WARNING: locking bug in corrupted
run #8: crashed: WARNING: locking bug in corrupted
run #9: crashed: WARNING: ODEBUG bug in corrupted
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 163d605b2b866ee1b4856d5cbdaa2b33e097e8251ce6549855d1417238805611
run #0: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #1: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #2: crashed: KASAN: use-after-free Read in route4_get
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: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: WARNING: ODEBUG bug in tcf_queue_work
run #9: crashed: WARNING: ODEBUG bug in __route4_delete_filter
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: e9f7ddf76651a41858359e0c73915a09f3c08afb375afa5e72d48b2cd2565764
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: KASAN: use-after-free Read in route4_get
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: WARNING: ODEBUG bug in tcf_queue_work
run #8: crashed: KASAN: use-after-free Read in route4_get
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: 35a749dea8cb5ab7c8d6194a8dd0aef79df8be696fa85e73c898b57f250ac9cf
run #0: crashed: WARNING: ODEBUG bug in route4_change
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: 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 v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 6d36dcc039f82bc2164290af9ac0548af660b389fc0a72a534f9fa2369761de4
run #0: crashed: WARNING: ODEBUG bug in route4_change
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: 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: 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: 5d44ebfdaa976cd580db8d11142a3d28a027017454e4647b5dad61c606fafa44
run #0: crashed: WARNING: ODEBUG bug in route4_change
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: KASAN: use-after-free Read in route4_get
run #7: crashed: WARNING: ODEBUG bug in route4_change
run #8: crashed: WARNING: ODEBUG bug in route4_change
run #9: crashed: KASAN: use-after-free Read in route4_get
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 68d285aa4b2f48db7c88f438b88dfb487fe0e0c74144a03b79bc28040f744bec
run #0: crashed: WARNING: ODEBUG bug in route4_change
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_delete_filter
run #4: crashed: WARNING: ODEBUG bug in __route4_delete_filter
run #5: crashed: WARNING: ODEBUG bug in route4_change
run #6: crashed: KASAN: use-after-free Read in route4_get
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 v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: ab9ae2936ac4816a6d1abe4c362f7446cf76cb52f0f01707f9c2960b58185c6b
run #0: crashed: WARNING: ODEBUG bug in route4_change
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: 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: KASAN: use-after-free Read in route4_get
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: b2ad2ac567ae39c60a0520c1ac8b087e9371f8ba86aff02ce63c0b9833026a12
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: 3f1c3e20ce76a5fe1e61c704c0a8341d238cbb1672014e16bbfd722cbc545291
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: 3a2b9bef60bdb6e28ca6fbed676c755792291c4950610079d2ffee1b377be75f
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: 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: 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: KASAN: use-after-free Read in route4_get
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: b26e70c6df91d0b009fcd127468e189d63d2898a2a6c9be43e59aa2d781fbbf7
run #0: crashed: KASAN: use-after-free Read in route4_get
run #1: crashed: WARNING: ODEBUG bug in route4_change
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: WARNING: ODEBUG bug in route4_change
run #6: crashed: KASAN: use-after-free Read in route4_get
run #7: crashed: WARNING: ODEBUG bug in route4_change
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: 1d90ac261bb07dad9ced03bf1c600e1c442d6276b05ab1c690145712c65f6257
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: 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 route4_change
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: KASAN: use-after-free Read in route4_get
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: 6e198d24d3fec9a44105d11ce2241a891afbebbcf7376270fee7e8a89eb96a3a
all runs: crashed: KASAN: use-after-free Read in route4_get
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 8c12ea7f3f2d3e3cedc8763e3ed00aa58b3e6ba9dfb7ba66f890630268aea013
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 22, total time: 3h22m40.023324715s (build: 2h2m48.504140477s, test: 1h17m28.869935086s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_1 entered promiscuous mode
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6947 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: 6947 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 1ffffffff0d95756 ffff8800b9cf6fb0 ffffffff82c74fc6 ffffffff85c81040
 ffff8800b9cf7088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b9cf7078
 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