bisecting cause commit starting from f66ed1ebbfde37631fba289f7c399eaa70632abf
building syzkaller on 58ae5e18624eaaac79cab00e63d6f32c9bd64ee0
testing commit f66ed1ebbfde37631fba289f7c399eaa70632abf with gcc (GCC) 8.1.0
kernel signature: a886e1eb3b4aafb731a3faa2b8c4234fbecdb7192cb1965931f6139b0742dc4a
run #0: crashed: general protection fault in do_syscall_64
run #1: crashed: general protection fault in do_syscall_64
run #2: crashed: general protection fault in do_syscall_64
run #3: crashed: general protection fault in do_syscall_64
run #4: crashed: general protection fault in do_syscall_64
run #5: crashed: general protection fault in do_syscall_64
run #6: crashed: general protection fault in do_syscall_64
run #7: crashed: general protection fault in do_syscall_64
run #8: crashed: BUG: sleeping function called from invalid context in corrupted
run #9: crashed: no output from test machine
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: 84c360e68aa7feffd5ceff0810e938471cc3df32c99fda61318f4c978ef96ac1
run #0: crashed: BUG: sleeping function called from invalid context in do_page_fault
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #2: crashed: BUG: sleeping function called from invalid context in do_page_fault
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #4: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #5: crashed: general protection fault in exit_to_usermode_loop
run #6: crashed: BUG: sleeping function called from invalid context in do_page_fault
run #7: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #9: crashed: BUG: sleeping function called from invalid context in do_page_fault
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: 4475dfb8d0581b1a257be81a19f48f2066d50f7d869708a07b880511bed5c625
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 paging request in do_syscall_64
run #3: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #5: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #8: crashed: general protection fault in syscall_trace_enter
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 348604357bd55d2c8cb57cd0acb22d40c34b34e0611ee1f13da953d4d82133c1
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 81e3f18fe31cbc6d2cf3eb858a531af8f7853129180a503e4c8a93a4914ab25e
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: f089c011ed18eb179cd2043e051bbad114a2f9e103ee57c5525623fab68b0268
run #0: crashed: KASAN: use-after-free Read in sync_regs
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 v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 4397e94a296fdc95e39618b15b792cc45d3c38474a832b05cbed145364321503
run #0: crashed: invalid opcode in do_syscall_64
run #1: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #2: crashed: general protection fault in do_syscall_64
run #3: crashed: general protection fault in do_syscall_64
run #4: crashed: general protection fault in do_syscall_64
run #5: crashed: general protection fault in do_syscall_64
run #6: crashed: general protection fault in do_syscall_64
run #7: crashed: unexpected kernel reboot
run #8: crashed: general protection fault in do_syscall_64
run #9: crashed: invalid opcode in update_vsyscall
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 4aa4b3f82bc90b40e385c60aea9d8fc99f1f2bc9e8b459e99d19a512573d98c3
run #0: crashed: invalid opcode in do_syscall_64
run #1: crashed: invalid opcode in do_syscall_64
run #2: crashed: invalid opcode in do_syscall_64
run #3: crashed: invalid opcode in do_syscall_64
run #4: crashed: invalid opcode in do_syscall_64
run #5: crashed: general protection fault in syscall_trace_enter
run #6: crashed: BUG: sleeping function called from invalid context in corrupted
run #7: crashed: general protection fault in update_vsyscall
run #8: crashed: general protection fault in syscall_return_slowpath
run #9: crashed: invalid opcode in do_syscall_64
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 470fc050ee316e0f8c094f97ad21758264c34f1b0f9356565da43153da5952cc
run #0: crashed: general protection fault in update_vsyscall
run #1: crashed: general protection fault in syscall_return_slowpath
run #2: crashed: KASAN: stack-out-of-bounds Write in preempt_count_add
run #3: crashed: BUG: sleeping function called from invalid context in corrupted
run #4: crashed: invalid opcode in do_syscall_64
run #5: crashed: invalid opcode in do_syscall_64
run #6: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #7: crashed: invalid opcode in do_syscall_64
run #8: crashed: invalid opcode in do_syscall_64
run #9: crashed: invalid opcode in do_syscall_64
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 75312743faa72978350d2cd575ebdfd91c29ca09e8d2638198e316f844ca179e
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: adceebfa627cd2ea39d9d97103585d3da55d3e2418afafa3d1410f57f3c1319c
run #0: crashed: general protection fault in do_syscall_64
run #1: crashed: general protection fault in syscall_return_slowpath
run #2: crashed: general protection fault in update_vsyscall
run #3: crashed: invalid opcode in do_syscall_64
run #4: crashed: general protection fault in update_vsyscall
run #5: crashed: general protection fault in do_syscall_64
run #6: crashed: general protection fault in do_syscall_64
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
run #8: crashed: general protection fault in do_syscall_64
run #9: crashed: general protection fault in do_syscall_64
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 1115d84a7d4d47d2a3dfa8821e92f14607caea249b553314f61584fd0ba6b0dd
run #0: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #1: crashed: KASAN: out-of-bounds Write in do_syscall_64
run #2: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #3: crashed: general protection fault in update_vsyscall
run #4: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #5: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #6: crashed: general protection fault in do_syscall_64
run #7: crashed: BUG: unable to handle kernel paging request in do_syscall_64
run #8: crashed: general protection fault in syscall_trace_enter
run #9: crashed: general protection fault in syscall_trace_enter
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: efdfdf8afe617fe4ac076b0a66a0994baa0f9c9cecbdd0a58a8af830f848eeeb
run #0: crashed: invalid opcode in do_syscall_64
run #1: crashed: invalid opcode in do_syscall_64
run #2: crashed: BUG: sleeping function called from invalid context in corrupted
run #3: crashed: invalid opcode in do_syscall_64
run #4: crashed: invalid opcode in do_syscall_64
run #5: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #6: crashed: invalid opcode in do_syscall_64
run #7: crashed: general protection fault in do_syscall_64
run #8: crashed: invalid opcode in do_syscall_64
run #9: crashed: invalid opcode in do_syscall_64
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 7e25d6649ab2543cb99d28e88767953d5233f862bdf8d3c97f4f0c0f0f1182be
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: 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 v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: edd98ccd4f01f1a522da3f108e12d1f120285a7eda240501c7835efd968fdc1f
all runs: crashed: unexpected kernel reboot
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: 19d0eed293290d2a578caa176e4d7bd0720becbdce3c7f5a871e0cdb59ebb1dc
run #0: crashed: BUG: sleeping function called from invalid context in __do_page_fault
run #1: crashed: invalid opcode in corrupted
run #2: crashed: invalid opcode in syscall_trace_enter
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in syscall_return_slowpath
run #4: crashed: invalid opcode in corrupted
run #5: crashed: invalid opcode in syscall_trace_enter
run #6: crashed: unexpected kernel reboot
run #7: crashed: general protection fault in prepare_exit_to_usermode
run #8: crashed: invalid opcode in do_syscall_64
run #9: crashed: BUG: sleeping function called from invalid context in corrupted
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 8f73ab2536ab94012434292d2a49a8841f9fdcb967c116acf8710953df36b8aa
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: 297abb3615e4c184604764b6eba037c0c887e4cec79147ea996022344ab91c5e
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: af6c4ff1c7a24af14c7fbb7110f7629d11ccd8bb3ffa5d4e4c2cd8d0b0df3203
run #0: crashed: BUG: unable to handle kernel paging request in syscall_return_slowpath
run #1: crashed: general protection fault in syscall_return_slowpath
run #2: crashed: BUG: unable to handle kernel paging request in update_vsyscall
run #3: crashed: BUG: unable to handle kernel paging request in update_vsyscall
run #4: crashed: general protection fault in syscall_return_slowpath
run #5: crashed: BUG: unable to handle kernel paging request in update_vsyscall
run #6: crashed: BUG: unable to handle kernel paging request in update_vsyscall
run #7: crashed: unexpected kernel reboot
run #8: crashed: unexpected kernel reboot
run #9: crashed: no output from test machine
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: f7f1c88d79dd0d36c6a0e516b8b6f28607e03eeeff4475a5d623a71bf5fb8849
run #0: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall
run #1: crashed: general protection fault in prepare_exit_to_usermode
run #2: crashed: unexpected kernel reboot
run #3: crashed: unexpected kernel reboot
run #4: crashed: unexpected kernel reboot
run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in update_vsyscall
run #6: crashed: invalid opcode in corrupted
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 v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: 45bb88051d44af4d517db1e7f6af3bf032a6ad93b70b314045b395a0132e088c
run #0: crashed: invalid opcode in prepare_exit_to_usermode
run #1: crashed: BUG: unable to handle kernel paging request in corrupted
run #2: crashed: BUG: unable to handle kernel
run #3: crashed: general protection fault in prepare_exit_to_usermode
run #4: crashed: invalid opcode in prepare_exit_to_usermode
run #5: crashed: invalid opcode in prepare_exit_to_usermode
run #6: crashed: invalid opcode in prepare_exit_to_usermode
run #7: crashed: KASAN: out-of-bounds Read in prepare_exit_to_usermode
run #8: crashed: general protection fault in do_syscall_64
run #9: crashed: unexpected kernel reboot
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: 8fdccd627aa971418c122b4d38427efcc2a80f5d18a6c09be466fde1f26a99e4
run #0: crashed: BUG: Bad page map
run #1: crashed: general protection fault in ipv6_add_addr
run #2: crashed: BUG: unable to handle kernel paging request in veth_xmit
run #3: crashed: kernel BUG at net/ipv6/ip6_fib.c:LINE!
run #4: crashed: BUG: Bad page map
run #5: crashed: general protection fault in prepare_exit_to_usermode
run #6: crashed: WARNING in lo_release
run #7: crashed: BUG: unable to handle kernel paging request in percpu_ref_switch_to_atomic_rcu
run #8: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor701882193" "root@10.128.0.97:./syz-executor701882193"]: exit status 1
ssh: connect to host 10.128.0.97 port 22: Connection timed out
lost connection

run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in do_syscall_64
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: 39ee05c4b5620e9a13d2cd8ea5d830e9dbb3c0c0bf49e96fdfa88227a7f83e78
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 23, total time: 3h53m14.072643204s (build: 2h6m41.07759419s, test: 1h43m41.426039568s)
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: 1 PID: 5866 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: 5866 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800afef6fc8 ffffffff82c65932 ffffffff85c81040
 ffff8800afef70a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009
 ffff8800afef7090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a
Call Trace:
 [<ffffffff82c65932>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c65932>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8160d374>] 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
 [<ffffffff8191b86b>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff8191c0e1>] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff8191c143>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff8191c143>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83530157>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83530157>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff83531198>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff83531298>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff83531298>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d0584>] 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
 [<ffffffff84920687>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849450d8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849450d8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c7cd9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838ce94f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff84975b8b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84970632>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84af3c52>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff84970405>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84af27ea>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84af27ea>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84af341b>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848cf915>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848cf915>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848d370a>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848d370a>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b70740>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled