rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5776/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=72989, q=288 ncpus=2)
task:syz-executor state:R running task stack:21128 pid:5776 ppid:5773 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1107 [inline]
copy_pmd_range mm/memory.c:1168 [inline]
copy_pud_range mm/memory.c:1205 [inline]
copy_p4d_range mm/memory.c:1229 [inline]
copy_page_range+0x2be5/0x3700 mm/memory.c:1323
dup_mmap kernel/fork.c:769 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm+0x1751/0x1e30 kernel/fork.c:1749
copy_process+0x16c9/0x3da0 kernel/fork.c:2510
kernel_clone+0x24b/0x8a0 kernel/fork.c:2919
__do_sys_clone kernel/fork.c:3062 [inline]
__se_sys_clone kernel/fork.c:3046 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3046
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f021b3c6bd2
RSP: 002b:00007ffee4dcb1b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffee4dcb1b0 RCX: 00007f021b3c6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffee4dcb33c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555913c07d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 000000000006a1ee R15: 00007ffee4dcb390
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g72989 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=29427
rcu: rcu_preempt kthread starved for 10500 jiffies! g72989 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:27848 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: bat_events batadv_nc_worker
RIP: 0010:kasan_check_range+0x1ba/0x290 mm/kasan/generic.c:-1
Code: 49 01 dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 6b 49 ff c3 49 ff cc 75 f2 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 45 84 ff 0f 85 91 00 00 00 41 f7 c7
RSP: 0000:ffffc90000007c58 EFLAGS: 00000056
RAX: 0000000000000001 RBX: ffffffff975927d0 RCX: ffffffff8169f11d
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff975927d0
RBP: ffffc90000007d50 R08: ffffffff975927d3 R09: 1ffffffff2eb24fa
R10: dffffc0000000000 R11: fffffbfff2eb24fb R12: 0000000000000001
R13: ffff8880687b0340 R14: fffffbfff2eb24fb R15: 1ffffffff2eb24fa
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7cb0f279c0 CR3: 0000000065d32000 CR4: 00000000003506f0
Call Trace:
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline]
debug_spin_unlock kernel/locking/spinlock_debug.c:100 [inline]
do_raw_spin_unlock+0x4d/0x230 kernel/locking/spinlock_debug.c:140
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline]
_raw_spin_unlock_irqrestore+0x79/0x120 kernel/locking/spinlock.c:194
debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
__run_hrtimer kernel/time/hrtimer.c:1722 [inline]
__hrtimer_run_queues+0x2cc/0xc10 kernel/time/hrtimer.c:1818
hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5794
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0000:ffffc90000107a40 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 2541f7b2fd6e7b00
RDX: 0000000000000000 RSI: ffffffff8acade60 RDI: ffffffff8b1d4020
RBP: ffffc90000107b48 R08: dffffc0000000000 R09: 1ffffffff223e0a0
R10: dffffc0000000000 R11: fffffbfff223e0a1 R12: 1ffff92000020f54
R13: ffffffff8d1320e0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xef/0x600 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293