rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 1, t=10502 jiffies, g=16125, q=909 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294961204-4294950704), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10501 jiffies! g16125 f0x2 RCU_GP_CLEANUP(7) ->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:27232 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4c90 kernel/sched/core.c:6961
preempt_schedule_irq+0xb4/0x140 kernel/sched/core.c:7288
irqentry_exit+0x6c/0x80 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_gp_slow_is_suppressed kernel/rcu/tree.c:1364 [inline]
RIP: 0010:rcu_gp_slow kernel/rcu/tree.c:1371 [inline]
RIP: 0010:rcu_gp_cleanup+0x609/0xfa0 kernel/rcu/tree.c:2202
Code: 24 30 42 80 3c 30 00 74 0c 48 c7 c7 00 12 a1 8d e8 7c 78 7b 00 48 8b 05 a5 3f fa 0b 48 89 05 de 2a 2d 0c 44 8b 35 57 9d a9 17 <48> 8b 1d d0 9d a9 17 48 85 db 74 3a 48 89 df be 04 00 00 00 e8 be
RSP: 0018:ffffc90000157c30 EFLAGS: 00000246
RAX: 00000000ffffbf30 RBX: ffff88801c695ea9 RCX: 55a91dd9bb325300
RDX: ffff88801c695a00 RSI: ffffffff8d6b7e21 RDI: ffffffff8b9e2080
RBP: ffffffff8dd3f480 R08: ffffffff8f586737 R09: 1ffffffff1eb0ce6
R10: dffffc0000000000 R11: fffffbfff1eb0ce7 R12: ffffffff8dd3f534
R13: 1ffffffff1ba7e99 R14: 0000000000000000 R15: ffffffff8dd3f518
rcu_gp_kthread+0xa7/0x390 kernel/rcu/tree.c:2289
kthread+0x70e/0x890 kernel/kthread.c:463
ret_from_fork+0x435/0x7c0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 6454 Comm: syz.1.38 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:futex_hash+0x101/0x2d0 kernel/futex/core.c:310
Code: 75 d4 ea ff 48 89 df 31 f6 e8 fb 01 00 00 49 89 c4 4c 8d 68 58 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 ef e8 55 5f 70 00 4d 8b 6d 00 4d 85 ed 74 20 e8 17 d5
RSP: 0018:ffffc90002eb7960 EFLAGS: 00000246
RAX: 1ffff1100f2ab443 RBX: ffffc90002eb7b08 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffc90002eb7b10 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8dd3a160 R09: ffffffff81b1eab0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807955a1c0
R13: ffff88807955a218 R14: 0000000000000000 R15: ffffffff81b1eab0
FS: 00007fb4b7f436c0(0000) GS:ffff888126510000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000007666a000 CR4: 00000000003526f0
Call Trace:
class_hb_constructor kernel/futex/futex.h:240 [inline]
futex_wait_setup+0xc9/0x590 kernel/futex/waitwake.c:623
__futex_wait+0x148/0x3e0 kernel/futex/waitwake.c:682
futex_wait+0x104/0x360 kernel/futex/waitwake.c:715
do_futex+0x333/0x420 kernel/futex/syscalls.c:102
__do_sys_futex kernel/futex/syscalls.c:179 [inline]
__se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x8a/0x300 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb4b718eba9
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:00007fb4b7f430e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fb4b73d5fa8 RCX: 00007fb4b718eba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb4b73d5fa8
RBP: 00007fb4b73d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb4b73d6038 R14: 00007ffe6c1bf9c0 R15: 00007ffe6c1bfaa8