------------[ cut here ]------------
WARNING: CPU: 0 PID: 7374 at lib/list_debug.c:36 __list_add+0x169/0x1c0 lib/list_debug.c:34
list_add double add: new=ffff8801d34c7a18, prev=ffffffff847116a0, next=ffff8801d34c7a18.
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7374 Comm: syz-executor310 Not tainted 4.9.120-gf85543b #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b8bd78a8 ffffffff81eb8049 ffffffff83c48ac0 00000000ffffffff
 0000000000000000 0000000000000000 0000000000000024 ffff8801b8bd7968
 ffffffff814239b5 0000000041b58ab3 ffffffff843bb7e8 ffffffff814237f6
Call Trace:
 [<ffffffff81eb8049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb8049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff814239b5>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81423ca1>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff81137c92>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81f1fd79>] __list_add+0x169/0x1c0 lib/list_debug.c:34
 [<ffffffff813b3f4c>] list_add include/linux/list.h:63 [inline]
 [<ffffffff813b3f4c>] blk_trace_startstop+0x24c/0x340 kernel/trace/blktrace.c:626
 [<ffffffff8277e73d>] sg_ioctl+0x11ad/0x2940 drivers/scsi/sg.c:1135
 [<ffffffff815b5c9c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b5c9c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b5c9c>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b6d1f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b6d1f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839ffcd3>] 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..