rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 ticks this GP) idle=dd84/1/0x4000000000000000 softirq=19525/19525 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P2811/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=21381, q=282 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6468 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
RIP: 0010:lock_release+0x5d1/0x9f0 kernel/locking/lockdep.c:5776
Code: 08 48 8b 5c 24 28 49 89 dd 4c 8d b4 24 90 00 00 00 48 c7 c7 00 ca ca 8b e8 0c 15 16 0a b8 ff ff ff ff 65 0f c1 05 bf e8 8f 7e <83> f8 01 0f 85 9a 00 00 00 4c 89 f3 48 c1 eb 03 42 80 3c 3b 00 74
RSP: 0018:ffffc90000a18b20 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000046 RCX: ffffc90000a18b03
RDX: 0000000000000001 RSI: ffffffff8bcaca00 RDI: ffffffff8c1fe1a0
RBP: ffffc90000a18c50 R08: ffffffff8fad38af R09: 1ffffffff1f5a715
R10: dffffc0000000000 R11: fffffbfff1f5a716 R12: 1ffff92000143170
R13: 0000000000000046 R14: ffffc90000a18bb0 R15: dffffc0000000000
FS: 00007fa17904d6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31337000 CR3: 000000006a0e2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
_raw_spin_unlock_irqrestore+0x79/0x140 kernel/locking/spinlock.c:194
snd_hrtimer_callback+0x1e8/0x370 sound/core/hrtimer.c:50
__run_hrtimer kernel/time/hrtimer.c:1687 [inline]
__hrtimer_run_queues+0x5a5/0xd50 kernel/time/hrtimer.c:1751
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1813
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
__sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 8e 95 68 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 93 2f d2 f5 65 8b 05 c4 60 70 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc900043afa00 EFLAGS: 00000206
RAX: 9590583227aa1400 RBX: 1ffff92000875f44 RCX: ffffffff8172e86a
RDX: dffffc0000000000 RSI: ffffffff8bcab880 RDI: 0000000000000001
RBP: ffffc900043afa90 R08: ffffffff92fb1697 R09: 1ffffffff25f62d2
R10: dffffc0000000000 R11: fffffbfff25f62d3 R12: dffffc0000000000
R13: 1ffff92000875f40 R14: ffffc900043afa20 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
class_spinlock_irqsave_destructor include/linux/spinlock.h:574 [inline]
snd_timer_stop1+0x7e6/0x950 sound/core/timer.c:634
__snd_timer_user_ioctl+0x868/0x5340
snd_timer_user_ioctl+0x65/0xa0 sound/core/timer.c:2058
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa17827cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa17904d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa1783abf80 RCX: 00007fa17827cee9
RDX: 0000000000000000 RSI: 00000000000054a3 RDI: 0000000000000004
RBP: 00007fa1782c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa1783abf80 R15: 00007fa1784cfa98
task:kworker/u8:7 state:R running task stack:23208 pid:2811 tgid:2811 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6745
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:7017
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:725
rcu_read_lock include/linux/rcupdate.h:782 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0x10b/0x610 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g21381 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=7894
rcu: rcu_preempt kthread starved for 10502 jiffies! g21381 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:26320 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x17e8/0x4a50 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244