rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29/2:b..l P12557/1:b..l P5792/5:b..l
rcu: (detected by 0, t=10502 jiffies, g=49425, q=265 ncpus=2)
task:syz-executor state:R running task stack:22168 pid:5792 tgid:5792 ppid:5791 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14de/0x51d0 kernel/sched/core.c:6902
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7229
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x97/0x2c0 mm/kasan/generic.c:200
Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 9e 01 00 00 49 ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd
RSP: 0018:ffffc90004cd7370 EFLAGS: 00000246
RAX: 1ffffffff3275d01 RBX: ffffffffffffffff RCX: ffffffff822fbd34
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801c1f4c28
RBP: ffff88801c1f4be0 R08: ffff88801c1f4c2b R09: 1ffff1100383e985
R10: dffffc0000000000 R11: ffffed100383e985 R12: 0000000000000001
R13: 000000000004e426 R14: ffffed100383e986 R15: 1ffff1100383e985
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
page_table_check_set+0x294/0x610 mm/page_table_check.c:120
page_table_check_ptes_set include/linux/page_table_check.h:76 [inline]
set_ptes include/linux/pgtable.h:292 [inline]
__copy_present_ptes mm/memory.c:1102 [inline]
copy_present_ptes mm/memory.c:1181 [inline]
copy_pte_range mm/memory.c:1304 [inline]
copy_pmd_range+0x3ad0/0x7bd0 mm/memory.c:1392
copy_pud_range mm/memory.c:1429 [inline]
copy_p4d_range mm/memory.c:1453 [inline]
copy_page_range+0xad0/0x1110 mm/memory.c:1539
dup_mmap+0xf7c/0x1b70 mm/mmap.c:1827
dup_mm kernel/fork.c:1530 [inline]
copy_mm+0x13b/0x4b0 kernel/fork.c:1582
copy_process+0x18be/0x3d00 kernel/fork.c:2223
kernel_clone+0x249/0x7f0 kernel/fork.c:2654
__do_sys_clone kernel/fork.c:2795 [inline]
__se_sys_clone kernel/fork.c:2779 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2779
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8294ad4a12
RSP: 002b:00007fffc128e300 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fffc128e300 RCX: 00007f8294ad4a12
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fffc128e48c R08: 0000000000000000 R09: 0000000000000001
R10: 000055556acb47d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000caf74 R15: 00007fffc128e4e0
task:kworker/u8:20 state:R running task stack:23720 pid:12557 tgid:12557 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound nsim_dev_trap_report_work
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14de/0x51d0 kernel/sched/core.c:6902
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7086
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
__migrate_enable include/linux/sched.h:2384 [inline]
migrate_enable include/linux/sched.h:2424 [inline]
rt_spin_unlock+0xf0/0x200 kernel/locking/spinlock_rt.c:81
spin_unlock include/linux/spinlock_rt.h:109 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:893 [inline]
nsim_dev_trap_report_work+0xacb/0xbc0 drivers/net/netdevsim/dev.c:921
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
task:ktimers/1 state:R running task stack:22920 pid:29 tgid:29 ppid:2 task_flags:0x4208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14de/0x51d0 kernel/sched/core.c:6902
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7086
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:194
unlock_rt_mutex_safe kernel/locking/rtmutex.c:344 [inline]
rt_mutex_slowunlock+0x4a7/0x8b0 kernel/locking/rtmutex.c:1454
spin_unlock_irqrestore include/linux/spinlock_rt.h:129 [inline]
class_spinlock_irqsave_destructor include/linux/spinlock.h:618 [inline]
snd_seq_timer_interrupt+0x34f/0x470 sound/core/seq/seq_timer.c:131
snd_timer_process_callbacks sound/core/timer.c:785 [inline]
snd_timer_interrupt+0x10a8/0x1360 sound/core/timer.c:901
snd_hrtimer_callback+0x213/0x3a0 sound/core/hrtimer.c:51
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x553/0xd10 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x192/0x5d0 kernel/time/hrtimer.c:1858
handle_softirqs+0x1de/0x640 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1138
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: rcu_preempt kthread starved for 10502 jiffies! g49425 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:28112 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5290 [inline]
__schedule+0x14de/0x51d0 kernel/sched/core.c:6902
__schedule_loop kernel/sched/core.c:6984 [inline]
schedule+0x164/0x360 kernel/sched/core.c:6999
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 84 4c 02 e9 13 c2 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 d2 17 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8d807dc0 EFLAGS: 00000246
RAX: 0000000001165f8b RBX: ffffffff81985b7d RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d3443b4 RDI: ffffffff8b861680
RBP: ffffffff8d807eb0 R08: ffff8880b8833cdb R09: 1ffff1101710679b
R10: dffffc0000000000 R11: ffffed101710679c R12: ffffffff8f48f770
R13: 1ffffffff1b205d8 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812659c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3c202e CR3: 000000002f892000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1bd/0x500 kernel/sched/idle.c:332
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
rest_init+0x2de/0x300 init/main.c:757
start_kernel+0x380/0x3d0 init/main.c:1206
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147