bisecting cause commit starting from 30bb5572ce7a8710fa9ea720b6ecb382791c9800
building syzkaller on 35f53e457420e79fa28e3260cdbbf9f37b9f97e4
testing commit 30bb5572ce7a8710fa9ea720b6ecb382791c9800 with gcc (GCC) 8.1.0
kernel signature: 0ae2d76160dbff4a05d1826f19a643c030e86be4bb90d1061658298973f7d391
run #0: crashed: BUG: sleeping function called from invalid context in do_page_fault
run #1: crashed: BUG: sleeping function called from invalid context in do_page_fault
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: crashed: no output from test machine
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 6c2337ed11bb9bd2053e508b8f818940652038ccc4bec1b7714ceeeaf75e7976
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
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 v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: e53aa189c7cb0028026604221cbc07bd01a88d0602bde15cbd6c6e175948186f
run #0: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #1: crashed: unexpected kernel reboot
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: general protection fault in do_syscall_64
run #5: crashed: BUG: sleeping function called from invalid context in __do_page_fault
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: 266c08ae0ed0e2e04636e2d63aa936f708d518b546eb719bf322c3e53b92f80e
run #0: crashed: general protection fault in do_fast_syscall_32
run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #5: crashed: BUG: sleeping function called from invalid context in __do_page_fault
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 v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 19c65a6f0629c55b277b31da7477596c8f0bd81f5d4477758e3c3415a610c529
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #5: crashed: unexpected kernel reboot
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in do_fast_syscall_32
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: c3bbceb5b6f0123e1b308c166d110bfdba79bb7d2dce93e9bea145b2edcac3bf
run #0: crashed: general protection fault in do_fast_syscall_32
run #1: crashed: general protection fault in do_fast_syscall_32
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: general protection fault in do_fast_syscall_32
run #6: crashed: general protection fault in do_fast_syscall_32
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 v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 21463159c68bad75f3859a41978ba726364aa6a75a914564f43a5da651fb2a1d
run #0: crashed: general protection fault in do_int80_syscall_32
run #1: crashed: general protection fault in do_fast_syscall_32
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: general protection fault in do_fast_syscall_32
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 v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 06da3cabad05d999206453dd917fa87fb6b3a8b1dc37e3159f104aac4b03ec9d
run #0: crashed: general protection fault in do_fast_syscall_32
run #1: crashed: general protection fault in do_fast_syscall_32
run #2: crashed: general protection fault in do_fast_syscall_32
run #3: crashed: general protection fault in do_fast_syscall_32
run #4: crashed: general protection fault in do_fast_syscall_32
run #5: crashed: general protection fault in do_fast_syscall_32
run #6: crashed: unexpected kernel reboot
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: general protection fault in do_fast_syscall_32
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 19c79482e958d7bc30769cf151a02bc09b17fa9c8883fa2ba2d68b55743f3470
run #0: crashed: general protection fault in do_fast_syscall_32
run #1: crashed: general protection fault in do_fast_syscall_32
run #2: crashed: unexpected kernel reboot
run #3: crashed: general protection fault in do_fast_syscall_32
run #4: crashed: general protection fault in do_fast_syscall_32
run #5: crashed: BUG: unable to handle kernel paging request in update_vsyscall
run #6: crashed: general protection fault in do_fast_syscall_32
run #7: crashed: BUG: unable to handle kernel paging request in update_vsyscall
run #8: crashed: unexpected kernel reboot
run #9: crashed: general protection fault in do_fast_syscall_32
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: 89b943ea8470e59ee00a096f0218f537b84a5fdfc25cffa86ed431c677fa6ee3
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: BUG: sleeping function called from invalid context in __do_page_fault
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: b191386aaddae1850663c5508507e35b1f762715eb555d7846c67962e17dd7bf
run #0: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #2: crashed: unexpected kernel reboot
run #3: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #4: crashed: unexpected kernel reboot
run #5: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #6: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #7: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #8: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #9: crashed: unexpected kernel reboot
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: c60ba59a4afe982bead004a7b169591a92dff791e8893784001538fa5259788b
run #0: crashed: unexpected kernel reboot
run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #2: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #3: crashed: unexpected kernel reboot
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 v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 194365c1aa6f22480d2a311e94a5f05cadcafc684b9c873dfa44451e68d05d80
run #0: crashed: unexpected kernel reboot
run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #2: crashed: BUG: sleeping function called from invalid context in __do_page_fault
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: unexpected kernel reboot
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: 96461f44c7729192b8a6621cc7a5ee21b9715078d590e1d4e4d6cdd112755f01
run #0: crashed: unexpected kernel reboot
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: BUG: sleeping function called from invalid context in __do_page_fault
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 v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: 377c241a5d7d383b19e9551f429af771f9c4f2467b1d984e27d2f702deef7661
run #0: crashed: general protection fault in do_fast_syscall_32
run #1: crashed: unexpected kernel reboot
run #2: crashed: general protection fault in do_fast_syscall_32
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: unexpected kernel reboot
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 6ec1d5504efcfaf5a179ade6ac6f56a5b5ee7823ebdf34c827046f873cf05608
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: 8a4b9756651622af0bd08d2242926ff3e811240386b4e5c3601f2ed3654ba533
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: 876aa1c66365a0af8cc9fbdf7f03840403e9141a79287003f1c5760cbc69f0b6
run #0: crashed: general protection fault in do_fast_syscall_32
run #1: crashed: general protection fault in do_fast_syscall_32
run #2: crashed: general protection fault in do_fast_syscall_32
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall
run #4: crashed: general protection fault in do_fast_syscall_32
run #5: crashed: general protection fault in do_fast_syscall_32
run #6: crashed: general protection fault in do_fast_syscall_32
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: unexpected kernel reboot
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: 45eb0f527b8f93a5fa13b49147735cec90da4a236179099b9f0009fa6826dee6
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: general protection fault in do_fast_syscall_32
run #8: crashed: unexpected kernel reboot
run #9: crashed: unexpected kernel reboot
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: e6750ecbf972a22806fe2fe74d8b296100f835ba93ea190039a5e84aec3d549c
all runs: crashed: unexpected kernel reboot
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: baea41aa8b9256a3f034afae736dbc155d4f2e429f6672213a4ea0b37cd8449f
run #0: crashed: general protection fault in ip6t_do_table
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: general protection fault in delayed_work_timer_fn
run #6: crashed: general protection fault in __rb_erase_color
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: unexpected kernel reboot
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 4401c0c20e28937ae0a20c648ea080d1a8362eff0636fc82a00b0018198d916a
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 22, total time: 4h8m16.897622688s (build: 2h1m8.833180872s, test: 2h4m48.237090278s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
device bridge_slave_0 entered promiscuous mode
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: 0 PID: 7513 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: 0 PID: 7513 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 ffff8800b4386e00 ffffffff82c74fc6 ffffffff85c81040
 ffff8800b4386ed8 ffffffff85d2bac0 ffffffff81922ccb ffff8800b4386ec8
 ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 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
 [<ffffffff838e6c74>] 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
 [<ffffffff84941897>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849675ea>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849675ea>] register_netdevice+0x88a/0xce0 net/core/dev.c:7027
 [<ffffffff838df9c9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838e582f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff8499494b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff8498fcf2>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84b198d2>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff8498fac5>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84b184d5>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84b184d5>] netlink_unicast+0x455/0x660 net/netlink/af_netlink.c:1240
 [<ffffffff84b18f73>] netlink_sendmsg+0x893/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848f1815>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848f1815>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848f27e9>] SYSC_sendto+0x1c9/0x300 net/socket.c:1648
 [<ffffffff848f4ad9>] SyS_sendto+0x9/0x10 net/socket.c:1616
 [<ffffffff849dd492>] C_SYSC_socketcall net/compat.c:810 [inline]
 [<ffffffff849dd492>] compat_SyS_socketcall+0x482/0x7d0 net/compat.c:768
 [<ffffffff810084e4>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff810084e4>] do_fast_syscall_32+0x324/0xa70 arch/x86/entry/common.c:454
 [<ffffffff85b9dc34>] entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
Kernel Offset: disabled