bisecting cause commit starting from d6efb3ac3e6c19ab722b28bdb9252bae0b9676b6
building syzkaller on cb436c69d9bcb0330518a48559649c9436ed5e7a
testing commit d6efb3ac3e6c19ab722b28bdb9252bae0b9676b6 with gcc (GCC) 8.1.0
kernel signature: 0fbda28d2e89b16a17fafad30c033bd5406e544a19c0571db4826a0ee49830df
run #0: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #1: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #2: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #6: OK
run #7: OK
run #8: OK
run #9: crashed: BUG: sleeping function called from invalid context in exc_page_fault
testing release v5.8
testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0
kernel signature: d05fd903daab8571a0485c57f274eea98c9a055af9319f0710660788d54e6dfb
run #0: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #1: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0
kernel signature: b26d7b70fcfee13cfe84d7ceb874887c7bae4e94daf3298f5e35fdf01d9950c2
run #0: crashed: KASAN: use-after-free Read in __queue_work
run #1: crashed: general protection fault in __queue_work
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: 28aaaf63a98628f688bb96511492d555ebf914f893eca5e583f1f5db9a88f16d
run #0: crashed: general protection fault in __queue_work
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in netdev_run_todo
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: general protection fault in __queue_work
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 2c7b233317d4c9a25cf63ad963f792d408700284ce809d8ba0a83e6d469fa66b
run #0: crashed: general protection fault in __queue_work
run #1: crashed: KASAN: use-after-free Read in __queue_work
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: KASAN: use-after-free Read in __queue_work
run #4: OK
run #5: crashed: general protection fault in __queue_work
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: db374f9823842e939eaa498cb9c4bc42e64c8d79252f67e24688f17f39ce6a78
run #0: crashed: general protection fault in __queue_work
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
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 v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: fe89fa30d16a359508bed54db2e6e76b4f301591df85c121e7ac62269033e94c
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 0baa232816aa218d5142808f106ccba202de48d4bd8eb80a1d53083c3bc5a3f0
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: KASAN: use-after-free Read in __queue_work
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 075ae541960af19dcf0328921828da6a723c858031ab68a76d4a8bd849ffc12d
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
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 v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 43f483d0115e13abb53533da77bd1748be3088af76bc39af5456713eb33eb460
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: OK
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING: ODEBUG bug in corrupted
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: cb75fbe12c02c376420a9b2063b6bb449c527565054bfc546728e8df8bbca313
run #0: crashed: KASAN: use-after-free Read in __queue_work
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 707318c538832cbd9ab6ade44faaae0a5f789c05011c7c1d19c04844ef0eec22
run #0: crashed: KASAN: use-after-free Read in __queue_work
run #1: crashed: general protection fault in __queue_work
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: WARNING: ODEBUG bug in bt_host_release
run #6: OK
run #7: OK
run #8: crashed: WARNING: ODEBUG bug in bt_host_release
run #9: OK
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: 9bbf44b7f8777c284f59992aff9e52ab15d2a69037050f10ed12075e08dc26f6
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: KASAN: use-after-free Read in __queue_work
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 871705ac65fdd0c814460190370e73606aee176e3ba47e1bf5751fd096371642
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
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 v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: ed472df06bc66bfdc6e72e867b1ee904cdf8c58866b8fd720461856e0ae649b6
run #0: crashed: general protection fault in __queue_work
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 0db428d124875a1c25986da1c37c8edff46c4ba03b13fab5d53e48999b5d8215
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: general protection fault in __queue_work
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: general protection fault in __queue_work
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 72e0db7faeb260762d30af71ab49ef936d099dc65697ca779b648356a3c76afa
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: WARNING: ODEBUG bug in bt_host_release
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: ba04ac39a520e6dea47b7ef376dbdd59b5432855a2827d8d9fcb3681d85d234e
run #0: crashed: KASAN: use-after-free Read in __queue_work
run #1: crashed: WARNING: ODEBUG bug in bt_host_release
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING: ODEBUG bug in bt_host_release
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: WARNING: ODEBUG bug in bt_host_release
run #6: crashed: WARNING: ODEBUG bug in bt_host_release
run #7: crashed: KASAN: use-after-free Read in __queue_work
run #8: crashed: general protection fault in __queue_work
run #9: crashed: WARNING: ODEBUG bug in bt_host_release
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 43d43535046004444d3a15826467dd5fedbfda4eaf9c15c6c0568ec53e5873d0
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: be0cb2926eb8b7efc159dc9724f67c083044dcf1f48f82fe7e23d8c8c228b456
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: 3dc52af5cb0b0bb091d2f70317526a97c644d35bec2b49d71e25538098752ae6
run #0: crashed: WARNING in nf_unregister_net_hook
run #1: crashed: WARNING in corrupted
run #2: crashed: WARNING in nf_unregister_net_hook
run #3: crashed: WARNING in batadv_mcast_mla_update
run #4: crashed: WARNING in nf_unregister_net_hook
run #5: crashed: WARNING in nf_unregister_net_hook
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: 8f730e226387a06bc66fb3a35fc17409feac8d1c572b377d3de8e7068ef5f2db
run #0: crashed: general protection fault in br_multicast_group_expired
run #1: crashed: WARNING in nf_unregister_net_hook
run #2: crashed: WARNING in nf_unregister_net_hook
run #3: crashed: WARNING in nf_unregister_net_hook
run #4: OK
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: 52f4b0c56bf1e65099ef978a36cd27a4a1374a5b0655654526158400fcc23547
run #0: crashed: KASAN: use-after-free Read in lockref_get_not_dead
run #1: crashed: KASAN: use-after-free Read in batadv_iv_ogm_queue_add
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 v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: f1fcce977eca7b96661eea5169602c7fe6d627dceb57f16d88beb84ccfe9463c
run #0: crashed: KASAN: use-after-free Read in lockref_get_not_dead
run #1: crashed: KASAN: use-after-free Read in lockref_get_not_dead
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 v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 03d3bd7bb1ab21579142e9f984018b358fd43086579128733bf0e082542d8a82
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 25, total time: 5h58m6.098492043s (build: 2h12m34.79335991s, test: 3h41m45.827121394s)
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
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
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: 1 PID: 5892 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: 5892 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 ffff8800b1d76fc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b1d770a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b1d77090 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