rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P136/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=156805, q=524 ncpus=2)
task:kworker/u8:5 state:R running task stack:24056 pid:136 tgid:136 ppid:2 task_flags:0x4208160 flags:0x00080000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:get_current arch/x86/include/asm/current.h:23 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xf/0x70 kernel/kcov.c:216
Code: 00 00 00 5b e9 52 02 f1 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 85 7f 02 12 48 8b 34 24 <65> 48 8b 15 61 7f 02 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00
RSP: 0018:ffffc90002e7fa98 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff8b53481c
RDX: 0000000000000001 RSI: ffffffff8b534508 RDI: ffff888020f52500
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88807afb4e40 R14: 000000000000005f R15: ffff88805d5f7540
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:774 [inline]
batadv_iv_ogm_schedule_buff+0x778/0x1520 net/batman-adv/bat_iv_ogm.c:829
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x6dd/0x860 net/batman-adv/bat_iv_ogm.c:1747
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
process_scheduled_works kernel/workqueue.c:3397 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 10491 jiffies! g156805 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=97143
rcu: rcu_preempt kthread starved for 10492 jiffies! g156805 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:28216 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 21100 Comm: syz.4.4069 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 61 00 be 03 00 00 00 5b e9 52 02 f1 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 85 7f 02 12 <48> 8b 34 24 65 48 8b 15 61 7f 02 12 a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc90000007d98 EFLAGS: 00000046
RAX: 0000000000010001 RBX: ffff888079d44000 RCX: ffffffff899c4ce2
RDX: ffff888041040000 RSI: ffffffff89600c47 RDI: ffff888079d44000
RBP: ffff8880266a4800 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 18b1a8c2a0bbe3f9 R14: ffff8880266a6c00 R15: ffff8880266a6c00
FS: 00007f32817856c0(0000) GS:ffff88812436d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31505ff8 CR3: 000000003e378000 CR4: 00000000003526f0
Call Trace:
__netif_schedule.part.0+0xe/0x2f0 net/core/dev.c:3403
__netif_schedule+0x4f/0x70 net/core/dev.c:3405
advance_sched+0x740/0xd20 net/sched/sch_taprio.c:993
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 46 a2 56 f6 48 89 df e8 1e f2 56 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 bb 46 f6 65 8b 05 1e 3f 7d 08 85 c0 74 16 5b
RSP: 0018:ffffc90005cc7b28 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9b1ae118 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8df22fb5 RDI: ffffffff8c1c4180
RBP: 0000000000000286 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff9b1ade80
R13: 0000000000000000 R14: ffffc90005cc7c80 R15: 7fffffffffffffff
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
__do_adjtimex+0x892/0xe70 kernel/time/timekeeping.c:2871
do_adjtimex+0xa0/0x370 kernel/time/timekeeping.c:2914
do_clock_adjtime kernel/time/posix-timers.c:1154 [inline]
__do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1166
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f328099ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3281785028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f3280c16180 RCX: 00007f328099ce59
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f3280a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3280c16218 R14: 00007f3280c16180 R15: 00007ffd8cdd6da8