rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8163/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=26625, q=376 ncpus=2)
task:syz.1.601 state:R running task stack:25608 pid:8163 ppid:6607 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__rcu_read_lock+0x31/0x60 kernel/rcu/tree_plugin.h:404
Code: 8b 1d f3 37 92 7e 48 81 c3 3c 04 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 11 ff 03 8b 03 <3d> 00 00 00 40 7d 02 5b c3 0f 0b eb fa 89 d9 80 e1 07 80 c1 03 38
RSP: 0018:ffffc9000d407ec8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff888027c9de3c RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888027c9da00
RBP: 0000000000000001 R08: ffffffff8e8ae5ef R09: 1ffffffff1d15cbd
R10: dffffc0000000000 R11: fffffbfff1d15cbe R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888027c9da00
rcu_read_lock include/linux/rcupdate.h:784 [inline]
__task_pid_nr_ns+0x21/0x470 kernel/pid.c:500
task_tgid_vnr include/linux/sched.h:1649 [inline]
__ia32_sys_getpid+0x1d/0x20 kernel/sys.c:960
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: 0033:0x7f422bd96bd7
RSP: 002b:00007ffecf5c7408 EFLAGS: 00000202 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 00007ffecf5c7570 RCX: 00007f422bd96bd7
RDX: 00007ffecf5c7440 RSI: 00007ffecf5c7570 RDI: 0000000000000021
RBP: 0000000000000000 R08: 0000000000745d1e R09: 0000000000000000
R10: 00007ffecf5c7ae0 R11: 0000000000000202 R12: 00007ffecf5c7b00
R13: 00007f422c015fac R14: 0000000000035246 R15: 00007ffecf5c7ae0
rcu: rcu_preempt kthread starved for 10514 jiffies! g26625 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:27656 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x111/0x120 kernel/locking/spinlock.c:194
rcu_gp_fqs_loop+0x326/0x1590 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: 6379 Comm: syz-execprog Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:131 [inline]
RIP: 0010:lock_acquire+0x1d7/0x420 kernel/locking/lockdep.c:5757
Code: 09 b8 ff ff ff ff 65 0f c1 05 bd 85 9a 7e 83 f8 01 0f 85 03 01 00 00 43 c6 44 3c 04 00 48 c7 84 24 80 00 00 00 00 00 00 00 9c <8f> 84 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c
RSP: 0018:ffffc90003727718 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 5e72f24763442300
RDX: 0000000000000000 RSI: ffffffff8acadce0 RDI: ffffffff8b1c7be0
RBP: ffffc90003727830 R08: dffffc0000000000 R09: 1ffffffff22378a2
R10: dffffc0000000000 R11: fffffbfff22378a3 R12: 1ffff920006e4ef0
R13: ffff8880b8e28a00 R14: 0000000000000046 R15: dffffc0000000000
FS: 00003624f8f6e090(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000075d4a000 CR4: 00000000003506f0
Call Trace:
do_write_seqcount_begin_nested include/linux/seqlock.h:515 [inline]
do_write_seqcount_begin include/linux/seqlock.h:541 [inline]
psi_write_begin kernel/sched/psi.c:179 [inline]
psi_task_switch+0xff/0x930 kernel/sched/psi.c:940
psi_sched_switch kernel/sched/stats.h:189 [inline]
__schedule+0x21d3/0x4660 kernel/sched/core.c:6695
schedule+0xbd/0x170 kernel/sched/core.c:6774
futex_wait_queue+0x138/0x1b0 kernel/futex/waitwake.c:355
futex_wait+0x1e9/0x5c0 kernel/futex/waitwake.c:656
do_futex+0x2ff/0x3e0 kernel/futex/syscalls.c:134
__do_sys_futex kernel/futex/syscalls.c:211 [inline]
__se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
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: 0033:0x493de3
Code: 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 002b:00003624f6d5de50 EFLAGS: 00000206 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000493de3
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000033d9590
RBP: 00003624f6d5de98 R08: 0000000000000000 R09: 0000000000000000
R10: 00003624f6d5de88 R11: 0000000000000206 R12: 00003624f6d5de88
R13: 0000000000000000 R14: 00003624f7010f00 R15: 0000000000000001