------------[ cut here ]------------
WARNING: CPU: 1 PID: 10137 at kernel/sched/tune.c:519 schedtune_cancel_attach+0x1c/0x20 kernel/sched/tune.c:519
blk_update_request: 509 callbacks suppressed
blk_update_request: I/O error, dev loop0, sector 4864
blk_update_request: I/O error, dev loop0, sector 5119
blk_update_request: I/O error, dev loop0, sector 2240
buffer_io_error: 509 callbacks suppressed
Buffer I/O error on dev loop0, logical block 280, lost async page write
blk_update_request: I/O error, dev loop0, sector 2232
Buffer I/O error on dev loop0, logical block 279, lost async page write
SchedTune cancel attach not implemented[  128.034051] Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10137 Comm: syz-executor5 Not tainted 4.9.124-g09eb2ba #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8887640 ffffffff81eb95e9 ffffffff83c48ac0 00000000ffffffff
 0000000000000000 0000000000000001 0000000000000207 ffff8801d8887700
 ffffffff81423eb5 0000000041b58ab3 ffffffff843bb8e8 ffffffff81423cf6
Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81423eb5>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff814241a1>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff81138252>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81228d0c>] schedtune_cancel_attach+0x1c/0x20 kernel/sched/tune.c:519
 [<ffffffff81315f0e>] cgroup_taskset_migrate+0xade/0xea0 kernel/cgroup.c:2597
 [<ffffffff81317fc3>] cgroup_update_dfl_csses kernel/cgroup.c:3121 [inline]
 [<ffffffff81317fc3>] cgroup_apply_control+0x523/0x650 kernel/cgroup.c:3357
 [<ffffffff81318ac2>] cgroup_subtree_control_write+0x9d2/0xf40 kernel/cgroup.c:3490
 [<ffffffff8130d44d>] cgroup_file_write+0x10d/0x550 kernel/cgroup.c:3517
 [<ffffffff81710e0e>] kernfs_fop_write+0x2ae/0x460 fs/kernfs/file.c:316
 [<ffffffff81573175>] __vfs_write+0x115/0x580 fs/read_write.c:507
 [<ffffffff81577237>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff8157b069>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff8157b069>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..