syzbot

Bluetooth: hci5: command 0x0406 tx timeout
Bluetooth: hci3: command 0x0406 tx timeout
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=35665, q=2495)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294976912-4294966409), jiffies_till_next_fqs=1, root ->qsmask 0x0
kworker/u4:10   R  running task    25664  9811      2 0x80000000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <IRQ>
 sched_show_task.cold+0x332/0x396 kernel/sched/core.c:5337
 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline]
 check_cpu_stall kernel/rcu/tree.c:1557 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0xb37/0xe19 kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1650
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1465 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527
 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:200 [inline]
RIP: 0010:atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:73 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x7b7/0xae0 kernel/locking/qspinlock.c:498
Code: df 48 c1 ea 03 0f b6 04 02 3c 03 7f 0c 84 c0 74 08 4c 89 ef e8 fa c3 4c 00 8b 44 24 60 ba 01 00 00 00 89 04 24 f0 0f b1 55 00 <0f> 84 76 fa ff ff 48 ba 00 00 00 00 00 fc ff df 4c 89 e9 48 c1 e9
RSP: 0018:ffff888058686cc8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040001 RBX: 0000000000000000 RCX: ffffffff814b9db1
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888058686d28
RBP: ffff888235104cc0 R08: 0000000000000000 R09: ffffed100b0d0da5
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888058686d28 R14: 0000000000000001 R15: ffff8880ba02be00
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:679 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:53 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:88 [inline]
 do_raw_spin_lock+0x189/0x220 kernel/locking/spinlock_debug.c:113
 spin_lock include/linux/spinlock.h:329 [inline]
 ext4_lock_group fs/ext4/ext4.h:3022 [inline]
 ext4_mb_discard_group_preallocations+0xada/0x12c0 fs/ext4/mballoc.c:3943
 ext4_mb_discard_preallocations fs/ext4/mballoc.c:4478 [inline]
 ext4_mb_new_blocks+0x1d1d/0x4370 fs/ext4/mballoc.c:4593
 ext4_ext_map_blocks+0x2aa2/0x7390 fs/ext4/extents.c:4493
 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657
 mpage_map_one_extent fs/ext4/inode.c:2477 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2530 [inline]
 ext4_writepages+0x1d1d/0x37f0 fs/ext4/inode.c:2882
 do_writepages+0xe5/0x290 mm/page-writeback.c:2344
 __writeback_single_inode+0x10c/0x11d0 fs/fs-writeback.c:1385
 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1716
 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1822
 wb_check_old_data_flush fs/fs-writeback.c:1924 [inline]
 wb_do_writeback fs/fs-writeback.c:1977 [inline]
 wb_workfn+0x8ba/0x1250 fs/fs-writeback.c:2006
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
rcu: rcu_preempt kthread starved for 10545 jiffies! g35665 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29016    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1818
 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415