INFO: task syz-executor.1:9227 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc5+ #137
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D24112  9227      1 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 exp_funnel_lock kernel/rcu/tree_exp.h:308 [inline]
 synchronize_rcu_expedited+0x544/0x5b0 kernel/rcu/tree_exp.h:816
 bdi_remove_from_list mm/backing-dev.c:924 [inline]
 bdi_unregister+0x167/0x5b0 mm/backing-dev.c:930
 release_bdi mm/backing-dev.c:952 [inline]
 kref_put include/linux/kref.h:65 [inline]
 bdi_put+0x15e/0x190 mm/backing-dev.c:961
 generic_shutdown_super+0x2b0/0x370 fs/super.c:472
 kill_anon_super+0x3e/0x60 fs/super.c:1102
 fuse_kill_sb_anon+0x1e/0x30 fs/fuse/inode.c:1258
 deactivate_locked_super+0x95/0x100 fs/super.c:331
 deactivate_super fs/super.c:362 [inline]
 deactivate_super+0x1b2/0x1d0 fs/super.c:358
 cleanup_mnt+0x351/0x4b0 fs/namespace.c:1102
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c257
Code: ff 00 00 0f 85 ef fe ff ff f3 0f 6f 46 20 f3 0f 6f 4f 20 66 0f 74 c8 66 0f d7 c1 48 35 ff ff 00 00 0f 85 c7 fe ff ff f3 0f 6f <46> 30 f3 0f 6f 4f 30 66 0f 74 c8 66 0f d7 c1 48 35 ff ff 00 00 0f
RSP: 002b:0000000000a6ecb8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 000000000008afd9 RCX: 000000000045c257
RDX: 0000000000403520 RSI: 0000000000000002 RDI: 0000000000a6ed60
RBP: 0000000000000a27 R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000005 R11: 0000000000000202 R12: 0000000000a6fdf0
R13: 0000555555691940 R14: 0000000000000000 R15: 0000000000a6fdf0
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc5+ #137
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0x9d0/0xef0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60