rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5601/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=179001, q=839 ncpus=2)
task:syz-executor state:R running task stack:22120 pid:5601 tgid:5601 ppid:5600 task_flags:0x400100 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x920 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:114 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:128 [inline]
RIP: 0010:lock_release+0x94/0x3c0 kernel/locking/lockdep.c:5960
Code: 85 17 02 00 00 65 4c 8b 3d f1 76 f2 12 41 83 bf a4 0b 00 00 00 0f 85 01 02 00 00 49 81 3e e0 c4 57 95 0f 84 f4 01 00 00 9c 5b 48 c7 c7 b2 41 48 8e e8 3f 3b 45 0a 65 ff 05 70 bb f2 12 c7 44
RSP: 0018:ffffc9000208f718 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000206 RCX: 8000000000000001
RDX: ffffc9000208f801 RSI: ffffffff8c6ddb60 RDI: ffffffff8c6ddb20
RBP: 1ffffffff2445001 R08: ffffc9000208fdd0 R09: ffffc9000208f878
R10: dffffc0000000000 R11: fffff52000411f11 R12: ffffc90002088000
R13: ffffffff817811df R14: ffffffff8fd5c8e0 R15: ffff888034bc5dc0
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:183
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
__slab_free+0x274/0x2c0 mm/slub.c:5823
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5414 [inline]
__kmalloc_noprof+0x36b/0x720 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
alloc_pipe_info+0x1f9/0x4c0 fs/pipe.c:900
get_pipe_inode fs/pipe.c:977 [inline]
create_pipe_files+0x88/0x7c0 fs/pipe.c:1009
__do_pipe_flags+0x46/0x1f0 fs/pipe.c:1071
do_pipe2+0xaa/0x190 fs/pipe.c:1119
__do_sys_pipe2 fs/pipe.c:1137 [inline]
__se_sys_pipe2 fs/pipe.c:1135 [inline]
__x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1135
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6042f9d589
RSP: 002b:00007ffe3dcc24f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000125
RAX: ffffffffffffffda RBX: 00005555644c0330 RCX: 00007f6042f9d589
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffe3dcc2510
RBP: 00007ffe3dcc2ae0 R08: 0000000000000800 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe3dcc2640
R13: 00005555644c7cc8 R14: 00005555644c02e8 R15: 00007ffe3dcc2660
rcu: rcu_preempt kthread starved for 8744 jiffies! g179001 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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 0 to CPUs 1:
NMI backtrace for cpu 1
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 08/26/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 1b 8b 02 e9 1e 8f 27 f5 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 d5 20 00 fb f4 f7 8e 27 f5 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001a7e40 EFLAGS: 00000242
RAX: 000000000219d051 RBX: ffffffff819bec0c RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e469822 RDI: ffffffff8c6ddb80
RBP: ffffc900001a7f10 R08: ffff8880b8533a1b R09: 1ffff110170a6743
R10: dffffc0000000000 R11: ffffed10170a6744 R12: 0000000000000000
R13: 1ffff11003e5ebb8 R14: 1ffff92000034fd0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555586ba38 CR3: 000000007e6ab000 CR4: 0000000000350ef0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:767 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:768
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x1cc/0x540 kernel/sched/idle.c:355
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x157