Bluetooth: hci7: command 0x0406 tx timeout
========================================================
WARNING: possible irq lock inversion dependency detected
6.4.0-rc7-next-20230623 #1 Not tainted
--------------------------------------------------------
syz-fuzzer/266 just changed the state of lock:
ffffffff85815818 (blkg_stat_lock){+.-.}-{2:2}, at: __blkcg_rstat_flush.isra.0+0x11f/0x4e0
but this lock was taken by another, HARDIRQ-safe lock in the past:
(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu)){-.-.}-{2:2}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(blkg_stat_lock);
local_irq_disable();
lock(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu));
lock(blkg_stat_lock);
<Interrupt>
lock(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu));
*** DEADLOCK ***
2 locks held by syz-fuzzer/266:
#0: ffffffff8560b5a0 (rcu_callback){....}-{0:0}, at: rcu_core+0x83e/0x28b0
#1: ffffffff8560b6c0 (rcu_read_lock){....}-{1:2}, at: __blkcg_rstat_flush.isra.0+0x93/0x4e0
the shortest dependencies between 2nd lock and 1st lock:
-> (per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu)){-.-.}-{2:2} {
IN-HARDIRQ-W at:
lock_acquire+0x19a/0x4c0
_raw_spin_lock_irqsave+0x3a/0x60
cgroup_rstat_updated+0xcb/0x2e0
__cgroup_account_cputime_field+0xa0/0x120
account_system_index_time+0x199/0x2c0
update_process_times+0x26/0x150
tick_sched_handle+0x8e/0x170
tick_sched_timer+0xe6/0x110
__hrtimer_run_queues+0x17f/0xb60
hrtimer_interrupt+0x2ef/0x750
__sysvec_apic_timer_interrupt+0xff/0x380
sysvec_apic_timer_interrupt+0x69/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
__sanitizer_cov_trace_pc+0x4/0x70
security_inode_alloc+0x2b/0x160
inode_init_always+0xbb2/0xea0
alloc_inode+0x84/0x240
new_inode+0x25/0x1f0
proc_pid_make_inode+0x26/0x230
proc_pid_make_base_inode.constprop.0+0x25/0x180
proc_pid_instantiate+0x54/0x1f0
proc_pid_lookup+0x20d/0x450
proc_root_lookup+0x24/0x70
__lookup_slow+0x252/0x470
walk_component+0x345/0x5b0
link_path_walk.part.0+0x76e/0xd90
path_openat+0x254/0x2710
do_filp_open+0x1ba/0x410
do_sys_openat2+0x164/0x1d0
__x64_sys_openat+0x143/0x200
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x6e/0xd8
IN-SOFTIRQ-W at:
lock_acquire+0x19a/0x4c0
_raw_spin_lock_irqsave+0x3a/0x60
cgroup_rstat_updated+0xcb/0x2e0
__cgroup_account_cputime_field+0xa0/0x120
account_system_index_time+0x199/0x2c0
update_process_times+0x26/0x150
tick_sched_handle+0x8e/0x170
tick_sched_timer+0xe6/0x110
__hrtimer_run_queues+0x17f/0xb60
hrtimer_interrupt+0x2ef/0x750
__sysvec_apic_timer_interrupt+0xff/0x380
sysvec_apic_timer_interrupt+0x33/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
__do_softirq+0x177/0x7d4
irq_exit_rcu+0x93/0xc0
common_interrupt+0x7c/0xa0
asm_common_interrupt+0x26/0x40
cgroup_kn_unlock+0x101/0x420
__cgroup_procs_write+0x3b6/0x6b0
cgroup_procs_write+0x26/0x60
cgroup_file_write+0x1e5/0x7c0
kernfs_fop_write_iter+0x3f7/0x610
vfs_write+0x97d/0xda0
ksys_write+0x122/0x250
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x6e/0xd8
INITIAL USE at:
lock_acquire+0x19a/0x4c0
_raw_spin_lock_irqsave+0x3a/0x60
cgroup_rstat_flush_locked+0x131/0xd80
cgroup_rstat_flush+0x37/0x50
do_flush_stats+0x97/0xf0
flush_memcg_stats_dwork+0x9/0x50
process_one_work+0xabf/0x1770
worker_thread+0x64f/0x12a0
kthread+0x33f/0x440
ret_from_fork+0x2c/0x50
}
... key at: [<ffffffff87b7e760>] __key.0+0x0/0x40
... acquired at:
_raw_spin_lock+0x2b/0x40
__blkcg_rstat_flush.isra.0+0x11f/0x4e0
blkcg_rstat_flush+0x87/0xb0
cgroup_rstat_flush_locked+0x706/0xd80
cgroup_rstat_flush+0x37/0x50
do_flush_stats+0x97/0xf0
flush_memcg_stats_dwork+0x9/0x50
process_one_work+0xabf/0x1770
worker_thread+0x64f/0x12a0
kthread+0x33f/0x440
ret_from_fork+0x2c/0x50
-> (blkg_stat_lock){+.-.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x19a/0x4c0
_raw_spin_lock+0x2b/0x40
__blkcg_rstat_flush.isra.0+0x11f/0x4e0
__blkg_release+0xfa/0x3b0
rcu_core+0x8c8/0x28b0
__do_softirq+0x1b7/0x7d4
irq_exit_rcu+0x93/0xc0
sysvec_apic_timer_interrupt+0x38/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
IN-SOFTIRQ-W at:
lock_acquire+0x19a/0x4c0
_raw_spin_lock+0x2b/0x40
__blkcg_rstat_flush.isra.0+0x11f/0x4e0
__blkg_release+0xfa/0x3b0
rcu_core+0x8c8/0x28b0
__do_softirq+0x1b7/0x7d4
irq_exit_rcu+0x93/0xc0
sysvec_apic_timer_interrupt+0x38/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
INITIAL USE at:
lock_acquire+0x19a/0x4c0
_raw_spin_lock+0x2b/0x40
__blkcg_rstat_flush.isra.0+0x11f/0x4e0
blkcg_rstat_flush+0x87/0xb0
cgroup_rstat_flush_locked+0x706/0xd80
cgroup_rstat_flush+0x37/0x50
do_flush_stats+0x97/0xf0
flush_memcg_stats_dwork+0x9/0x50
process_one_work+0xabf/0x1770
worker_thread+0x64f/0x12a0
kthread+0x33f/0x440
ret_from_fork+0x2c/0x50
}
... key at: [<ffffffff85815818>] blkg_stat_lock+0x18/0x60
... acquired at:
__lock_acquire+0x8b8/0x6340
lock_acquire+0x19a/0x4c0
_raw_spin_lock+0x2b/0x40
__blkcg_rstat_flush.isra.0+0x11f/0x4e0
__blkg_release+0xfa/0x3b0
rcu_core+0x8c8/0x28b0
__do_softirq+0x1b7/0x7d4
irq_exit_rcu+0x93/0xc0
sysvec_apic_timer_interrupt+0x38/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
stack backtrace:
CPU: 0 PID: 266 Comm: syz-fuzzer Not tainted 6.4.0-rc7-next-20230623 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x91/0xf0
print_irq_inversion_bug.part.0+0x3d5/0x570
mark_lock.part.0+0x900/0x2f50
__lock_acquire+0x8b8/0x6340
lock_acquire+0x19a/0x4c0
_raw_spin_lock+0x2b/0x40
__blkcg_rstat_flush.isra.0+0x11f/0x4e0
__blkg_release+0xfa/0x3b0
rcu_core+0x8c8/0x28b0
__do_softirq+0x1b7/0x7d4
irq_exit_rcu+0x93/0xc0
sysvec_apic_timer_interrupt+0x38/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x410719
Code: 04 0f 85 44 01 00 00 80 78 09 00 0f 85 8c 00 00 00 48 8b 40 10 eb 5d 48 ff c2 48 83 c1 04 48 83 fa 08 73 3a 8b 5c 24 38 39 19 <75> eb 0f b6 1c 02 80 fb 01 76 e2 48 8b 4c 24 28 0f b6 49 51 48 0f
RSP: 002b:000000c0001a7c00 EFLAGS: 00000246
RAX: 000000c001eedff0 RBX: 00000000f2f454fb RCX: 000000c001eedff8
RDX: 0000000000000000 RSI: 0000000000957680 RDI: 0000000000000038
RBP: 000000c0001a7c18 R08: 0000000000000000 R09: 0000000000203001
R10: 0000000000000002 R11: 0000000000000011 R12: 00000000000000f1
R13: 0000000000000000 R14: 0000000000e5dacd R15: 0000000000000000
</TASK>
Bluetooth: hci0: command 0x0406 tx timeout