bisecting cause commit starting from 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf
building syzkaller on 510951950dc0ee69cfdaf746061d3dbe31b49fd8
testing commit 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf with gcc (GCC) 8.1.0
kernel signature: 49f099576107809e80c3890bb2e6ad50a5286c759aa250d7e133297749fe167f
run #0: crashed: no output from test machine
run #1: crashed: no output from test machine
run #2: crashed: no output from test machine
run #3: crashed: no output from test machine
run #4: crashed: no output from test machine
run #5: crashed: no output from test machine
run #6: crashed: no output from test machine
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
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: 2ff49e0ea1a0684ce0a11090daa036bebda8c4275890f5d9a088b27ea61ba35e
run #0: crashed: BUG: sleeping function called from invalid context in do_page_fault
run #1: crashed: general protection fault in pvclock_gtod_notify
run #2: crashed: BUG: sleeping function called from invalid context in do_page_fault
run #3: crashed: no output from test machine
run #4: crashed: no output from test machine
run #5: crashed: no output from test machine
run #6: crashed: no output from test machine
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: 24d9b864b30fc2697580a4c6db4eab16c6701f399ed69b6e2f5d1090d408c606
all runs: crashed: no output from test machine
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 25ea619a127feec1987e10cac971e459c8d2b5c3c637a7476f7bedfbad89331f
all runs: crashed: no output from test machine
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 390fb57cae8b6831f52444819e4c5ddd300e169efe6d0884f71bd80c8081aedd
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: a9f301ba5b758dc8baad60c4ca40dea0b2503cf95326636b21db7b0671f1bc30
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: b84b5e09822e24460fb5c479213fb2cf5da2337a98904a718fe672efddcae090
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: general protection fault in prepare_exit_to_usermode
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: bf8b97790cc3cef3b6b5edd18f150ffc1cc064175fa13b635beb151f703b37c0
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 03df269d0741ff120b1be906e7cb3962fafa6c535f218d47579f12256924554f
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: a29d7f808ae5731ada142dc23e9e136892b60fc1a457ec44027cbfc5a5dc2392
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 6f65a0af6d462e12ddc75dd73382e7e47d25b9ecf041cf27ff8a55bbb0c8bd00
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: no output from test machine
run #6: crashed: no output from test machine
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: b03c845a689b65853283b63240f2498db7114267d0f063901a69f25ae7f1a1cd
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: a29b9e33d0ed670bb1d738b0dfa8d8ecf6a8223030b34419ab1fcdbd68717997
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 6a141d831ff44757dbddcc19c61b7e2a5ea4ddff2699499b038355aaee54d60d
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 0f60333758a0c01679abb17bd85a9bdf34b8da90bd6e0b87db84141e5fffe45a
run #0: crashed: unexpected kernel reboot
run #1: crashed: unexpected kernel reboot
run #2: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 254c31dc044da85ebffcea62b560675c1e8b4c2d15157be0491f35c2ca7481cd
run #0: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: unexpected kernel reboot
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #9: crashed: unexpected kernel reboot
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: e179c0b26f228893b0a8e6e8d21f518a60461ed3f846c4ede63901ddebb90d45
all runs: crashed: unexpected kernel reboot
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: a1478c6f093047dfadf3fe59748d72d2c46eb7a293f97d70cec795a817ca7672
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: 18299b4b99b703a61662f1ea13ab60c045c9d4796caf73d687307cbe9d7eeed0
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: 34173721d69485c7588d573eb6f893a6436f90cb231bbc389c73131da4f4df3c
all runs: crashed: unexpected kernel reboot
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: aefd840b73466d45cdd38aad3658ae0bdad724c66a1c4b9a5bd9fb271daefa99
all runs: crashed: unexpected kernel reboot
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 81d23b95f1471bffaccee33a7f3c419843280cca18f62295307dd39a2f677a5b
all runs: crashed: unexpected kernel reboot
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: 4ee0395c656afcc5ba0fea48a36a9f62d218a116feaf171969ac870cb1f69b9d
run #0: crashed: WARNING: ODEBUG bug in corrupted
run #1: crashed: unexpected kernel reboot
run #2: crashed: BUG: unable to handle kernel paging request in resize
run #3: crashed: general protection fault in check_lifetime
run #4: crashed: unexpected kernel reboot
run #5: crashed: general protection fault in fib6_walk_continue
run #6: crashed: unexpected kernel reboot
run #7: crashed: WARNING in account_entity_enqueue
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 02d385f6dc85a344b13f2101f9f223f193301efd878495cdbe4ba5818cc9967a
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 4h40m45.050706837s (build: 2h4m6.62181916s, test: 2h33m0.754586134s)
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): bridge_slave_1: link is not ready
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5868 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: 5868 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800b47b6fc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b47b70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b47b7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f05e2
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
 [<ffffffff83530677>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83530677>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff835316b8>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff835317b8>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff835317b8>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d0aa4>] 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
 [<ffffffff84920ba7>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849455f8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849455f8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c81f9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838cee6f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff849760ab>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84970b52>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84af4172>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff84970925>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84af2d0a>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84af2d0a>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84af393b>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848cfe35>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848cfe35>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848d3c2a>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848d3c2a>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b70c40>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled