rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11628/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=313033, q=362 ncpus=2)
task:syz.5.9741 state:R running task stack:26104 pid:11628 tgid:11626 ppid:6877 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x156/0x20a0 arch/x86/kernel/unwind_orc.c:494
Code: 0a 00 00 41 f6 86 88 00 00 00 03 0f 85 71 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8d 75 35 4c 89 f2 48 c1 ea 03 0f b6 04 02 <4c> 89 f2 83 e2 07 38 d0 7f 08 84 c0 0f 85 e4 09 00 00 48 89 e9 41
RSP: 0018:ffffc9000e246cc8 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff92001c48dad RSI: ffffffff8bf21100 RDI: ffffffff8dd69ee0
RBP: ffffc9000e246d80 R08: 00000000cdac3f13 R09: 00000000b19a5ccf
R10: ffff888027cfaff0 R11: 00000000fb19a5cc R12: ffffc9000e246d88
R13: ffffc9000e246d38 R14: ffffc9000e246d6d R15: ffff888027cfa4c0
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__set_page_owner+0x91/0x560 mm/page_owner.c:332
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1845
prep_new_page mm/page_alloc.c:1853 [inline]
get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3879
__alloc_frozen_pages_noprof+0x25f/0x2440 mm/page_alloc.c:5183
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
folio_alloc_mpol_noprof+0x36/0xe0 mm/mempolicy.c:2435
vma_alloc_folio_noprof+0xed/0x1e0 mm/mempolicy.c:2470
folio_prealloc mm/memory.c:1190 [inline]
wp_page_copy mm/memory.c:3680 [inline]
do_wp_page+0x13a4/0x5690 mm/memory.c:4141
handle_pte_fault mm/memory.c:6250 [inline]
__handle_mm_fault+0x1af2/0x2ad0 mm/memory.c:6366
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6535
do_user_addr_fault+0x2e4/0xda0 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x64/0xc0 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 0f 1f 80 00 00 00 00 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 c1 b7 03 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000e2479e8 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00002000001c3030
RDX: 0000000000080000 RSI: ffffffff892c3fa3 RDI: 0000000000000005
RBP: ffffc9000e247d88 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
R13: 00002000001c3000 R14: ffffc9000e247dcc R15: 0000000000000002
____sys_recvmsg+0x2ee/0x6b0 net/socket.c:2816
___sys_recvmsg+0x114/0x1a0 net/socket.c:2845
do_recvmmsg+0x2fe/0x750 net/socket.c:2940
__sys_recvmmsg net/socket.c:3014 [inline]
__do_sys_recvmmsg net/socket.c:3037 [inline]
__se_sys_recvmmsg net/socket.c:3030 [inline]
__x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3030
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7b1ed8f749
RSP: 002b:00007f7b1fc86038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f7b1efe6090 RCX: 00007f7b1ed8f749
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f7b1ee13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b1efe6128 R14: 00007f7b1efe6090 R15: 00007ffe43cd6d88
rcu: rcu_preempt kthread starved for 10551 jiffies! g313033 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27792 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 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: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 76 70 02 e9 93 2f 03 00 0f 1f 00 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 13 13 24 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197de8 EFLAGS: 000002c2
RAX: 000000001699bef3 RBX: 0000000000000001 RCX: ffffffff8b6646f9
RDX: 0000000000000000 RSI: ffffffff8dabd2db RDI: ffffffff8bf21180
RBP: ffffed1003b55498 R08: 0000000000000001 R09: ffffed10170a671d
R10: ffff8880b85338eb R11: 00000000ffffffff R12: 0000000000000001
R13: ffff88801daaa4c0 R14: ffffffff90871dd0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124a60000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001a000 CR3: 000000009ec0f000 CR4: 00000000003526f0
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+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x38d/0x510 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148