syzbot

INFO: task syz-executor.0:20299 blocked for more than 143 seconds.
      Not tainted 5.7.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29024 20299   7204 0x80004006
Call Trace:
 context_switch kernel/sched/core.c:3367 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4083
 schedule+0x188/0x220 kernel/sched/core.c:4158
 rwsem_down_write_slowpath+0x7d0/0xd60 kernel/locking/rwsem.c:1235
 __down_write kernel/locking/rwsem.c:1389 [inline]
 down_write+0x125/0x130 kernel/locking/rwsem.c:1532
 unregister_netdevice_notifier+0x30/0x380 net/core/dev.c:1776
 inode_lock include/linux/fs.h:797 [inline]
 __sock_release net/socket.c:604 [inline]
 sock_close+0x94/0x260 net/socket.c:1283
 bcm_release+0x77/0x800 net/can/bcm.c:1474
 atomic64_set include/asm-generic/atomic-instrumented.h:854 [inline]
 atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 rwsem_set_owner kernel/locking/rwsem.c:176 [inline]
 __down_write kernel/locking/rwsem.c:1391 [inline]
 down_write+0xcd/0x130 kernel/locking/rwsem.c:1532
 __sock_release net/socket.c:605 [inline]
 sock_close+0xd8/0x260 net/socket.c:1283
 sock_mmap+0x90/0x90 net/socket.c:1278
 __fput+0x2ed/0x750 fs/file_table.c:280
 task_work_run+0x147/0x1d0 kernel/task_work.c:123
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x5ef/0x1f80 kernel/exit.c:796
 do_group_exit+0x15e/0x2c0 kernel/exit.c:894
 get_signal+0x13cf/0x1d60 kernel/signal.c:2739
 alloc_file_pseudo+0x1d9/0x240 fs/file_table.c:233
 do_signal+0x33/0x610 arch/x86/kernel/signal.c:784
 rcu_read_unlock_sched include/linux/rcupdate.h:732 [inline]
 __fd_install+0x251/0x490 fs/file.c:613
 arch_static_branch arch/x86/include/asm/jump_label.h:25 [inline]
 static_key_false include/linux/jump_label.h:200 [inline]
 trace_irq_enable_rcuidle+0x1f/0x1d0 include/trace/events/preemptirq.h:40
 exit_to_usermode_loop arch/x86/entry/common.c:148 [inline]
 prepare_exit_to_usermode+0x280/0x600 arch/x86/entry/common.c:196
 exit_to_usermode_loop arch/x86/entry/common.c:161 [inline]
 prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xf9/0x420 arch/x86/entry/common.c:278
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 1138 Comm: khungtaskd Not tainted 5.7.0-rc6-syzkaller #0
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+0x1e9/0x30e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 arch_trigger_cpumask_backtrace+0x10/0x10 arch/x86/kernel/apic/hw_nmi.c:38
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xd2a/0xd40 kernel/hung_task.c:289
 kthread+0x353/0x380 kernel/kthread.c:268
 hungtask_pm_notify+0x50/0x50 kernel/hung_task.c:265
 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60