rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4270/1:b..l
(detected by 0, t=10503 jiffies, g=9693, q=160 ncpus=2)
task:syz-executor state:R running task stack:22144 pid:4270 ppid:4263 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__preempt_count_add kernel/rcu/tree.c:717 [inline]
RIP: 0010:rcu_is_watching+0x2/0xa0 kernel/rcu/tree.c:720
Code: eb 99 e8 91 bd ac 08 48 c7 c7 a0 17 b3 8c 4c 89 f6 e8 c2 a3 c3 02 e9 53 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 <41> 56 53 65 ff 05 bc 5a 97 7e e8 0f d2 ac 08 89 c3 83 f8 08 73 60
RSP: 0018:ffffc90003c47720 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88801ead5940
RDX: 0000000000000000 RSI: ffffffff8a8c1700 RDI: ffffffff8adef760
RBP: 0000000000000cc0 R08: dffffc0000000000 R09: fffffbfff215c449
R10: fffffbfff215c449 R11: 1ffffffff215c448 R12: 0000000000000000
R13: 0000000000000098 R14: ffff88801ead596c R15: dffffc0000000000
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309
task_css include/linux/cgroup.h:509 [inline]
mem_cgroup_from_task+0x96/0x110 mm/memcontrol.c:985
get_obj_cgroup_from_current+0x163/0x280 mm/memcontrol.c:3023
memcg_slab_pre_alloc_hook mm/slab.h:485 [inline]
slab_pre_alloc_hook+0x91/0x310 mm/slab.h:715
slab_alloc_node mm/slub.c:3279 [inline]
slab_alloc mm/slub.c:3367 [inline]
__kmem_cache_alloc_lru mm/slub.c:3374 [inline]
kmem_cache_alloc+0x56/0x2f0 mm/slub.c:3383
vm_area_dup+0x23/0x1a0 kernel/fork.c:467
dup_mmap kernel/fork.c:646 [inline]
dup_mm kernel/fork.c:1541 [inline]
copy_mm+0xa7e/0x15c0 kernel/fork.c:1590
copy_process+0x1953/0x4020 kernel/fork.c:2351
kernel_clone+0x225/0x8b0 kernel/fork.c:2757
__do_sys_clone kernel/fork.c:2898 [inline]
__se_sys_clone kernel/fork.c:2882 [inline]
__x64_sys_clone+0x17c/0x1d0 kernel/fork.c:2882
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f602db85e13
RSP: 002b:00007ffe98eb6b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f602db85e13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055558a2847d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000000169cc R15: 00007ffe98eb6cc0
rcu: rcu_preempt kthread starved for 10539 jiffies! g9693 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:26880 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4490 Comm: syz.4.24 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:trace_hardirqs_off+0x15/0x40 kernel/trace/trace_preemptirq.c:78
Code: 6a ff ff ff 48 c7 c7 b0 6c 1f 8e e8 e5 cf 49 00 e9 59 ff ff ff 53 48 8b 5c 24 08 48 89 df e8 e2 9d 90 08 65 8b 05 b3 00 7c 7e <85> c0 75 19 65 c7 05 a4 00 7c 7e 01 00 00 00 65 8b 05 ad 39 7b 7e
RSP: 0018:ffffc90004f37c10 EFLAGS: 00000082
RAX: 0000000000000000 RBX: ffffffff8a21e82a RCX: 85dd8cc67490af00
RDX: 0000000000000002 RSI: ffffffff8a8c0580 RDI: ffffffff8adef760
RBP: ffffc90004f37c98 R08: ffffc90004f30000 R09: fffffbfff1c3ed56
R10: fffffbfff1c3ed56 R11: 1ffffffff1c3ed55 R12: ffff888056cbd940
R13: dffffc0000000000 R14: 1ffff920009e6f84 R15: dffffc0000000000
FS: 00007ff5f07f66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002613b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
_raw_spin_lock_irq+0x7a/0xe0 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:376 [inline]
__set_current_blocked+0xe7/0x240 kernel/signal.c:3058
__ia32_sys_rt_sigreturn+0x184/0x790 arch/x86/kernel/signal.c:673
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff5f252b789
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007ff5f07f5b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007ff5f27e6188 RCX: 00007ff5f252b789
RDX: 00007ff5f07f5b40 RSI: 00007ff5f07f5c70 RDI: 0000000000000011
RBP: 00007ff5f27e6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff5f27e6218 R14: 00007fff7bef9640 R15: 00007fff7bef9728
sched: RT throttling activated