syzbot

INFO: task syz.3.20:6102 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:28368 pid:6102  tgid:6087  ppid:5957   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1585/0x5340 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7004
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 blk_trace_startstop+0x8f/0x610 kernel/trace/blktrace.c:901
 blk_trace_ioctl+0x315/0x740 kernel/trace/blktrace.c:947
 blkdev_common_ioctl+0x13a7/0x3250 block/ioctl.c:724
 blkdev_ioctl+0x528/0x740 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f530c39bf79
RSP: 002b:00007f530d2e4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f530c616180 RCX: 00007f530c39bf79
RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000007
RBP: 00007f530c4327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f530c616218 R14: 00007f530c616180 R15: 00007ffdd027c568
 </TASK>
INFO: task syz.2.19:6109 blocked for more than 150 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:26720 pid:6109  tgid:6091  ppid:5955   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5295 [inline]
 __schedule+0x1585/0x5340 kernel/sched/core.c:6907
 __schedule_loop kernel/sched/core.c:6989 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7004
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 relay_open+0x3b8/0x920 kernel/relay.c:516
 blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:716
 blk_trace_setup+0x2c0/0x430 kernel/trace/blktrace.c:789
 blk_trace_ioctl+0x380/0x740 kernel/trace/blktrace.c:935