IPVS: Creating netns size=2536 id=51
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8840 at lib/list_debug.c:36 __list_add+0x169/0x1c0 lib/list_debug.c:34
list_add double add: new=ffff8801bb7e71d8, prev=ffffffff847116a0, next=ffff8801bb7e71d8.
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8840 Comm: syz-executor2 Not tainted 4.9.122-g54068d6 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff88019d4bf8a8 ffffffff81eb8829 ffffffff83c48ac0 00000000ffffffff
 0000000000000000 0000000000000000 0000000000000024 ffff88019d4bf968
 ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76
Call Trace:
 [<ffffffff81eb8829>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb8829>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81423f35>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81424221>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff81138212>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81f20589>] __list_add+0x169/0x1c0 lib/list_debug.c:34
 [<ffffffff813b44cc>] list_add include/linux/list.h:63 [inline]
 [<ffffffff813b44cc>] blk_trace_startstop+0x24c/0x340 kernel/trace/blktrace.c:626
 [<ffffffff8277ef7d>] sg_ioctl+0x11ad/0x2940 drivers/scsi/sg.c:1135
 [<ffffffff815b67dc>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b67dc>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b67dc>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b785f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b785f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Shutting down cpus with NMI
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..