rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=2f34/0/0x1 softirq=43172/43172 fqs=1
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11290/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=39453, q=56 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-syzkaller-12063-g37816488247d #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:timerqueue_add+0x28f/0x330 lib/timerqueue.c:40
Code: 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 69 48 8b 04 24 48 89 ef 48 89 68 08 48 89 c6 e8 f4 85 ff ff 48 85 ed <41> 0f 95 c6 e9 25 ff ff ff e8 33 b7 2c f6 90 0f 0b 90 e9 ab fd ff
RSP: 0018:ffffc90000a08e00 EFLAGS: 00000082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8b8ed998
RDX: 1ffff1100f850e68 RSI: ffff8880b8527dd0 RDI: ffff88807c287340
RBP: ffff88807c287340 R08: 0000000000000006 R09: ffff88807c287340
R10: ffff88807c287340 R11: ffffffff9b0d1428 R12: ffff8880b8527c80
R13: 0000000000000000 R14: ffff88807c287340 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881247c4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000397030 CR3: 000000005b3d8000 CR4: 00000000003526f0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x8ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 2c 63 02 c3 cc cc cc cc 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 f3 52 17 00 fb f4 4c 0d 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df8 EFLAGS: 000002c2
RAX: 0000000000d26ddf RBX: 0000000000000001 RCX: ffffffff8b92bc29
RDX: 0000000000000000 RSI: ffffffff8de4e889 RDI: ffffffff8c161180
RBP: ffffed1003c5d488 R08: 0000000000000001 R09: ffffed10170a6655
R10: ffff8880b85332ab R11: 0000000000000000 R12: 0000000000000001
R13: ffff88801e2ea440 R14: ffffffff90ab0090 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148
task:syz-executor state:R running task stack:28952 pid:11290 tgid:11290 ppid:5841 task_flags:0x400040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5872
Code: f7 3d 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 62 37 13 0f 0f 82 74 02 00 00 8b 35 2a 69 13 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 b9 f6 3d 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc9001dcb7910 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5c1160 RCX: 00000000b315e02b
RDX: 0000000000000000 RSI: ffffffff8de29498 RDI: ffffffff8c161180
RBP: 0000000000000002 R08: 3dcec2d5cd23f461 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
xa_load+0xcd/0x2c0 lib/xarray.c:1617
memcg_list_lru_allocated mm/list_lru.c:510 [inline]
memcg_list_lru_alloc+0x1c0/0x740 mm/list_lru.c:521
__memcg_slab_post_alloc_hook+0x133/0x960 mm/memcontrol.c:3163
memcg_slab_post_alloc_hook mm/slub.c:2216 [inline]
slab_post_alloc_hook mm/slub.c:4190 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_lru_noprof+0x30f/0x3b0 mm/slub.c:4248
shmem_alloc_inode+0x25/0x50 mm/shmem.c:5211
alloc_inode+0x64/0x240 fs/inode.c:346
new_inode+0x22/0x1c0 fs/inode.c:1145
__shmem_get_inode mm/shmem.c:3110 [inline]
shmem_get_inode+0x19a/0xfb0 mm/shmem.c:3184
shmem_symlink+0xf8/0x9f0 mm/shmem.c:4158
vfs_symlink fs/namei.c:4730 [inline]
vfs_symlink+0x403/0x680 fs/namei.c:4714
do_symlinkat+0x261/0x310 fs/namei.c:4756
__do_sys_symlinkat fs/namei.c:4772 [inline]
__se_sys_symlinkat fs/namei.c:4769 [inline]
__x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4769
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcad658e167
RSP: 002b:00007fff34530408 EFLAGS: 00000202 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcad658e167
RDX: 00007fcad66136cd RSI: 00000000ffffff9c RDI: 00007fff345304a0
RBP: 00007fff3453044c R08: 0000000000000013 R09: 00007fff34530157
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000016d
R13: 00000000000927c0 R14: 0000000000054572 R15: 00007fff345304a0
rcu: rcu_preempt kthread starved for 10500 jiffies! g39453 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:27784 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d4/0x6f0 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: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-syzkaller-12063-g37816488247d #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 2c 63 02 c3 cc cc cc cc 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 f3 52 17 00 fb f4 4c 0d 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e207e08 EFLAGS: 000002c2
RAX: 0000000000d6bdcb RBX: 0000000000000000 RCX: ffffffff8b92bc29
RDX: 0000000000000000 RSI: ffffffff8de4e889 RDI: ffffffff8c161180
RBP: fffffbfff1c52ef8 R08: 0000000000000001 R09: ffffed1017086655
R10: ffff8880b84332ab R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8e2977c0 R14: ffffffff90ab0090 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881246c4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000404030 CR3: 0000000074af4000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
rest_init+0x16b/0x2b0 init/main.c:744
start_kernel+0x3ee/0x4d0 init/main.c:1097
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148