bisecting cause commit starting from ac3a0c8472969a03c0496ae774b3a29eb26c8d5a
building syzkaller on 80a0690249dc4dbbbed95ba197192b99c73694c5
testing commit ac3a0c8472969a03c0496ae774b3a29eb26c8d5a with gcc (GCC) 8.1.0
kernel signature: fc825e033009901ef218f5b788edaa4f0b901c7f8ecb721ffcd9bcd5734a5051
run #0: crashed: WARNING: ODEBUG bug in bt_host_release
run #1: crashed: WARNING: locking bug in hci_dev_reset
run #2: crashed: BUG: sleeping function called from invalid context in exc_page_fault
run #3: crashed: WARNING in hci_dev_reset
run #4: crashed: BUG: sleeping function called from invalid context in exc_page_fault
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: e77447903ec7cc195e389b94e59d8abd5e1be16b161a0b4fd50182c38cd93eb5
run #0: crashed: WARNING: locking bug in hci_dev_reset
run #1: crashed: WARNING: locking bug in hci_dev_reset
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING: locking bug in hci_dev_reset
run #4: crashed: general protection fault in __queue_work
run #5: crashed: WARNING: locking bug in hci_dev_reset
run #6: crashed: WARNING: ODEBUG bug in bt_host_release
run #7: OK
run #8: OK
run #9: OK
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: ba85bd36a540295ba9cbce9b9ba2870c166ed8a88f1bbe118a2cfe3780a9ee3a
run #0: crashed: WARNING in mark_lock
run #1: crashed: WARNING in mark_lock
run #2: crashed: WARNING: ODEBUG bug in bt_host_release
run #3: crashed: WARNING in mark_lock
run #4: crashed: WARNING in mark_lock
run #5: crashed: WARNING in mark_lock
run #6: crashed: WARNING in mark_lock
run #7: crashed: BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
run #8: OK
run #9: crashed: WARNING in mark_lock
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 0decd0d7b60e640ff8e312e4d1831a39570785d6e7e331d3ba19ef645f2b3f8e
run #0: crashed: general protection fault in __queue_work
run #1: crashed: general protection fault in __queue_work
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: crashed: WARNING in mark_lock
run #6: crashed: general protection fault in __queue_work
run #7: crashed: WARNING in mark_lock
run #8: OK
run #9: OK
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 35fd76551bd2aeac7d4b3cf5c7d967032426779998df435e86616a62f9814fa0
run #0: crashed: WARNING in mark_lock
run #1: crashed: WARNING in mark_lock
run #2: crashed: general protection fault in __queue_work
run #3: crashed: WARNING in mark_lock
run #4: crashed: general protection fault in __queue_work
run #5: crashed: WARNING in mark_lock
run #6: crashed: KASAN: use-after-free Read in hci_dev_reset
run #7: crashed: WARNING in mark_lock
run #8: crashed: general protection fault in __queue_work
run #9: crashed: WARNING in mark_lock
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 6f1dbaf8c9960355d4c06ef71bda27078c566962fd4a72fd6d79dc194e703304
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: general protection fault in __queue_work
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: KASAN: use-after-free Read in skb_dequeue
run #5: crashed: general protection fault in __queue_work
run #6: crashed: KASAN: use-after-free Read in skb_dequeue
run #7: crashed: general protection fault in __queue_work
run #8: crashed: KASAN: use-after-free Read in skb_dequeue
run #9: OK
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: ee2c02ea25c52a89cfa35b1ddb60b7697a4a8dc8169ad2382bed16782c8c8792
run #0: crashed: WARNING: locking bug in hci_dev_reset
run #1: crashed: KASAN: use-after-free Read in hci_dev_reset
run #2: crashed: general protection fault in __queue_work
run #3: crashed: WARNING: locking bug in hci_dev_reset
run #4: crashed: general protection fault in __queue_work
run #5: crashed: WARNING: locking bug in hci_dev_reset
run #6: crashed: general protection fault in __queue_work
run #7: crashed: general protection fault in __queue_work
run #8: crashed: KASAN: use-after-free Read in hci_dev_reset
run #9: OK
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 07a502768ef80feb00b35a2c27efa72d27b36c717fc4675f0e1c4698b1687e5a
run #0: crashed: general protection fault in __queue_work
run #1: crashed: general protection fault in __queue_work
run #2: crashed: WARNING: locking bug in hci_dev_reset
run #3: crashed: KASAN: use-after-free Read in hci_dev_reset
run #4: crashed: WARNING: locking bug in hci_dev_reset
run #5: crashed: WARNING: locking bug in hci_dev_reset
run #6: crashed: WARNING: locking bug in hci_dev_reset
run #7: crashed: general protection fault in __queue_work
run #8: crashed: WARNING: locking bug in hci_dev_reset
run #9: crashed: WARNING: locking bug in hci_dev_reset
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: b6b9c3b43b3f6725c7147825bcced34b72aead5329c7d51256a237aaedd51a62
run #0: crashed: general protection fault in __queue_work
run #1: crashed: general protection fault in __queue_work
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: general protection fault in __queue_work
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: general protection fault in __queue_work
run #7: crashed: general protection fault in __queue_work
run #8: OK
run #9: OK
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 264feef285c1d7dcd7380a34add04d133a00075241fa18481787de447fb47db8
run #0: crashed: general protection fault in __queue_work
run #1: crashed: general protection fault in __queue_work
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: KASAN: use-after-free Read in skb_dequeue
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: KASAN: use-after-free Read in skb_dequeue
run #7: OK
run #8: OK
run #9: OK
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 00a03e84b89972128a42bc07757fd6d7c6093145fd58509ea1b09c5cfd56ed4b
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: general protection fault in __queue_work
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: KASAN: use-after-free Read in skb_dequeue
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: KASAN: use-after-free Read in skb_dequeue
run #7: OK
run #8: OK
run #9: OK
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: 40fc8d840f7a9d5dd3405898395c27d65b4ff476fb7fc8d38a98f33d86dd2e9f
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: general protection fault in batadv_iv_ogm_queue_add
run #5: crashed: general protection fault in __queue_work
run #6: crashed: WARNING: ODEBUG bug in bt_host_release
run #7: crashed: KASAN: use-after-free Read in skb_dequeue
run #8: crashed: general protection fault in __queue_work
run #9: crashed: KASAN: use-after-free Read in skb_dequeue
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 25b607c7cde34ce5653dc0a6d172dd6a7d17453ce8c0951ad071876b8baa8ab1
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: general protection fault in __queue_work
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: general protection fault in __queue_work
run #5: crashed: general protection fault in __queue_work
run #6: crashed: KASAN: use-after-free Read in skb_dequeue
run #7: crashed: general protection fault in __queue_work
run #8: crashed: KASAN: use-after-free Read in skb_dequeue
run #9: OK
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 2ec7e6f19e5aac43098bd04163623d0eed460dc9a048295297fede056dee8c21
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: general protection fault in __queue_work
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: KASAN: use-after-free Read in skb_dequeue
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: KASAN: use-after-free Read in skb_dequeue
run #7: crashed: general protection fault in __queue_work
run #8: crashed: KASAN: invalid-free in batadv_iv_ogm_iface_disable
run #9: OK
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 8fd1b1a0e28112dfaf9a4732d649081cf7112787181c17df1f0c9fc6b86007aa
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: general protection fault in __queue_work
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: KASAN: use-after-free Read in skb_dequeue
run #7: crashed: general protection fault in __queue_work
run #8: crashed: general protection fault in __queue_work
run #9: crashed: KASAN: use-after-free Read in skb_dequeue
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: cde58dd0ddc9e9ff2c2c8e35a65b2638a9f6fedaf675b1994cb26c3fb3fd088c
run #0: crashed: general protection fault in __queue_work
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: general protection fault in __queue_work
run #3: crashed: general protection fault in __queue_work
run #4: crashed: KASAN: use-after-free Read in skb_dequeue
run #5: crashed: general protection fault in __queue_work
run #6: crashed: general protection fault in batadv_iv_ogm_queue_add
run #7: crashed: KASAN: use-after-free Read in skb_dequeue
run #8: crashed: general protection fault in __queue_work
run #9: OK
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: e8a15ae0e474797efe8e243a701da5726049e80d7356bd4478f2ec90c73e8acc
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: general protection fault in __queue_work
run #2: crashed: KASAN: use-after-free Read in skb_dequeue
run #3: crashed: KASAN: use-after-free Read in skb_dequeue
run #4: crashed: WARNING: ODEBUG bug in bt_host_release
run #5: crashed: KASAN: use-after-free Read in skb_dequeue
run #6: crashed: general protection fault in __queue_work
run #7: OK
run #8: OK
run #9: OK
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 76393986f40de41f1691018526b6bcfc4225e26c5f6c649cc97474c0e34a9994
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: 620913a8659da97a8f7cbd77e50a9fad97c0fea02a34c00694f2895c634231fc
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: fc2e00a0a339714b3b9a00d758c317fa64d4f0dedda1a5d49f34cfac287b4e7d
run #0: crashed: KASAN: use-after-free Read in skb_dequeue
run #1: crashed: KASAN: use-after-free Read in skb_dequeue
run #2: crashed: WARNING in corrupted
run #3: crashed: WARNING in nf_unregister_net_hook
run #4: crashed: KASAN: use-after-free Read in skb_dequeue
run #5: crashed: WARNING in nf_unregister_net_hook
run #6: crashed: WARNING in nf_unregister_net_hook
run #7: crashed: WARNING in nf_unregister_net_hook
run #8: crashed: KASAN: use-after-free Read in skb_dequeue
run #9: crashed: KASAN: use-after-free Read in lockref_get_not_dead
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: b22d409af109026ac96bbf05204786cd4be169ff010b2ea7252460fe48f1016b
run #0: crashed: WARNING in nf_unregister_net_hook
run #1: crashed: WARNING in nf_unregister_net_hook
run #2: crashed: KASAN: use-after-free Read in vlan_device_event
run #3: crashed: WARNING in nf_unregister_net_hook
run #4: crashed: WARNING in nf_unregister_net_hook
run #5: crashed: BUG: Double free or freeing an invalid pointer
run #6: crashed: general protection fault in batadv_iv_ogm_queue_add
run #7: crashed: general protection fault in batadv_iv_ogm_queue_add
run #8: OK
run #9: OK
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 238003efa211f628def2940f8688ccfb1199e229dfe8c38b38555c3fd3df7b8d
run #0: crashed: KASAN: use-after-free Read in lockref_get_not_dead
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 v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: a368188b6e17feb87cdde52dba72c642e16b9c4db87651ce2cb1f11203f486d6
run #0: crashed: KASAN: use-after-free Read in cancel_delayed_work_sync
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 v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 09542fa0f9febc3faf561e22b7e27a38c63623edcb90ad42369d8b5230eceb3b
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 5h32m18.197067179s (build: 2h9m43.355270499s, test: 3h18m53.688307267s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
8021q: adding VLAN 0 to HW filter on device bond0
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5880 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: 5880 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800b25a6fc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b25a70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b25a7090 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