rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1208/1:b..l P10889 P10848/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=44157, q=114 ncpus=2)
task:syz.6.1089 state:R running task stack:19640 pid:10848 tgid:10844 ppid:7496 task_flags:0x400840 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x14bc/0x5030 kernel/sched/core.c:6864
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7191
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x16c/0x350 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 54 ec d7 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003406880 EFLAGS: 00000206
RAX: 438459c9ce637800 RBX: 0000000000000000 RCX: 438459c9ce637800
RDX: 0000000000000000 RSI: ffffffff8d977664 RDI: ffffffff8bbf7760
RBP: ffffffff82043cb0 R08: 0000000000000000 R09: ffffffff82043cb0
R10: dffffc0000000000 R11: fffffbfff1efbe6f R12: 0000000000000002
R13: ffffffff8df3d700 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
add_nr_deferred_memcg mm/shrinker.c:275 [inline]
add_nr_deferred mm/shrinker.c:363 [inline]
do_shrink_slab+0x8b1/0x1120 mm/shrinker.c:462
shrink_slab_memcg mm/shrinker.c:550 [inline]
shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628
shrink_node_memcgs mm/vmscan.c:6020 [inline]
shrink_node+0xb03/0x35b0 mm/vmscan.c:6059
shrink_zones mm/vmscan.c:6298 [inline]
do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6360
try_to_free_mem_cgroup_pages+0x2ea/0x7d0 mm/vmscan.c:6688
try_charge_memcg+0xa39/0x1280 mm/memcontrol.c:2388
try_charge mm/memcontrol.c:2530 [inline]
charge_memcg+0x9f/0x180 mm/memcontrol.c:4728
__mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:4745
mem_cgroup_charge include/linux/memcontrol.h:663 [inline]
folio_prealloc+0x51/0x180 mm/memory.c:1198
wp_page_copy mm/memory.c:3719 [inline]
do_wp_page+0x1231/0x5800 mm/memory.c:4180
handle_pte_fault mm/memory.c:6289 [inline]
__handle_mm_fault mm/memory.c:6411 [inline]
handle_mm_fault+0x14c8/0x32c0 mm/memory.c:6580
do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:104
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <89> 01 31 c9 0f 01 ca e9 01 83 03 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900034078b8 EFLAGS: 00050202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00002000000e5030
RDX: ffff88802df88000 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc90003407a30 R08: ffffc90003407667 R09: 1ffff92000680ecc
R10: dffffc0000000000 R11: fffff52000680ecd R12: 0000000000000002
R13: 00002000000e5000 R14: 0000000000000000 R15: dffffc0000000000
____sys_recvmsg+0x2f5/0x4c0 net/socket.c:2881
___sys_recvmsg+0x1b5/0x510 net/socket.c:2910
do_recvmmsg+0x307/0x770 net/socket.c:3005
__sys_recvmmsg net/socket.c:3079 [inline]
__do_sys_recvmmsg net/socket.c:3102 [inline]
__se_sys_recvmmsg net/socket.c:3095 [inline]
__x64_sys_recvmmsg+0x190/0x240 net/socket.c:3095
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3fa518f749
RSP: 002b:00007f3fa33f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f3fa53e6090 RCX: 00007f3fa518f749
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f3fa5213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fa53e6128 R14: 00007f3fa53e6090 R15: 00007ffdd53fb6a8
task:syz.7.1102 state:R running task stack:25192 pid:10889 tgid:10888 ppid:10112 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task+0x49d/0x630 kernel/sched/core.c:7823
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall+0xf7a/0x1340 kernel/rcu/tree_stall.h:681
check_cpu_stall kernel/rcu/tree_stall.h:857 [inline]
rcu_pending kernel/rcu/tree.c:3671 [inline]
rcu_sched_clock_irq+0xa47/0x11b0 kernel/rcu/tree.c:2706
update_process_times+0x23c/0x2f0 kernel/time/timer.c:2474
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x3e9/0x710 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x4d0/0xc70 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x410 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:64 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:141 [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+0x6b/0x2c0 mm/kasan/generic.c:200
Code: 00 ff f3 0f 1e fa 4c 39 cf 0f 82 58 02 00 00 49 89 ff 49 c1 ef 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 17 49 ff c8 4d 89 c1 <49> c1 e9 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d
RSP: 0018:ffffc900033878c8 EFLAGS: 00000282
RAX: ffffffff897b0401 RBX: ffffc90003387a08 RCX: ffffffff897b04ec
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801c730000
RBP: 000000007fffffff R08: ffff88801c730007 R09: ffff88801c730007
R10: dffffc0000000000 R11: ffffed10038e6000 R12: 00000000190d92d0
R13: dffffc0000000000 R14: 1ffff92000670f41 R15: 1ffff110038e6000
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
test_ti_thread_flag include/linux/thread_info.h:131 [inline]
test_tsk_thread_flag include/linux/sched.h:2018 [inline]
signal_pending include/linux/sched/signal.h:393 [inline]
bpf_test_timer_continue+0x6c/0x320 net/bpf/test_run.c:64
bpf_test_run+0x397/0x7a0 net/bpf/test_run.c:427
bpf_prog_test_run_skb+0xda9/0x1d70 net/bpf/test_run.c:1158
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4712
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6191
__do_sys_bpf kernel/bpf/syscall.c:6283 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6281 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6281
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2f638f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa2f714c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa2f65e5fa0 RCX: 00007fa2f638f749
RDX: 000000000000009f RSI: 0000200000000900 RDI: 000000000000000a
RBP: 00007fa2f6413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa2f65e6038 R14: 00007fa2f65e5fa0 R15: 00007ffed93a5048
task:kworker/1:2 state:R running task stack:24296 pid:1208 tgid:1208 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events cleanup_vm_area_work
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x14bc/0x5030 kernel/sched/core.c:6864
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7191
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0xb0/0x350 kernel/locking/lockdep.c:5844
Code: b5 90 df 0d 00 0f 84 fa 00 00 00 65 8b 05 b8 32 d8 10 85 c0 0f 85 eb 00 00 00 65 48 8b 04 25 08 80 76 92 83 b8 2c 0b 00 00 00 <0f> 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00 9c 8f 44 24 30 4c 89
RSP: 0018:ffffc9000453f878 EFLAGS: 00000246
RAX: ffff888026c31e80 RBX: 0000000000000000 RCX: 1067a23da75fe700
RDX: 0000000000000000 RSI: ffffffff8231ad35 RDI: 1ffffffff1be7ae0
RBP: ffffffff8231ad19 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed102808e139 R12: 0000000000000002
R13: ffffffff8df3d700 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
percpu_ref_put+0x35/0x180 include/linux/percpu-refcount.h:351
css_put include/linux/cgroup_refcnt.h:79 [inline]
obj_cgroup_uncharge_pages mm/memcontrol.c:2804 [inline]
__memcg_kmem_uncharge_page+0xea/0x170 mm/memcontrol.c:2890
free_pages_prepare mm/page_alloc.c:1320 [inline]
__free_frozen_pages+0x17b/0xd30 mm/page_alloc.c:2943
vfree+0x25a/0x400 mm/vmalloc.c:3466
cleanup_vm_area_work+0xa2/0x100 mm/vmalloc.c:3763
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9f5/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 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 2313 jiffies! g44157 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:27144 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x14bc/0x5030 kernel/sched/core.c:6864
__schedule_loop kernel/sched/core.c:6946 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6961
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc 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 40 0c 00 f3 0f 1e fa fb f4 c8 f2 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8dc07d80 EFLAGS: 000002c6
RAX: 0b1634dd2488af00 RBX: ffffffff8197a977 RCX: 0b1634dd2488af00
RDX: 0000000000000001 RSI: ffffffff8d790e8f RDI: ffffffff8bbf7760
RBP: ffffffff8dc07ea8 R08: ffff8880b86336db R09: 1ffff110170c66db
R10: dffffc0000000000 R11: ffffed10170c66dc R12: ffffffff8f7df370
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b92a60
FS: 0000000000000000(0000) GS:ffff888125eb8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd6cb723944 CR3: 0000000027710000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000404
DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x1e7/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
rest_init+0x2de/0x300 init/main.c:757
start_kernel+0x3a7/0x410 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