WARNING in __list_add (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: f85543ba Merge 4.9.120 into android-4.9
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=1795ccba400000
kernel config: https://syzkaller.appspot.com/x/.config?x=b62520caa9df174
dashboard link: https://syzkaller.appspot.com/bug?extid=832716454338eb9a805f
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167815ee400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=133baa12400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+832716...@syzkaller.appspotmail.com

------------[ 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..


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