rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8755/1:b..l P8733/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=25057, q=412 ncpus=2)
task:syz.0.697 state:R running task stack:26184 pid:8733 tgid:8722 ppid:5815 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0xfee/0x6120 kernel/sched/core.c:6908
preempt_schedule_notrace+0x5f/0xd0 kernel/sched/core.c:7185
preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:753
rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
hash_net6_list+0xbc1/0x1290 net/netfilter/ipset/ip_set_hash_gen.h:1376
ip_set_dump_do+0x1093/0x1d00 net/netfilter/ipset/ip_set_core.c:1660
netlink_dump+0x539/0xd30 net/netlink/af_netlink.c:2325
__netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2440
netlink_dump_start include/linux/netlink.h:341 [inline]
ip_set_dump net/netfilter/ipset/ip_set_core.c:1717 [inline]
ip_set_dump+0x1c2/0x200 net/netfilter/ipset/ip_set_core.c:1705
nfnetlink_rcv_msg+0x9f4/0x1200 net/netfilter/nfnetlink.c:302
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
nfnetlink_rcv+0x1b3/0x440 net/netfilter/nfnetlink.c:669
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x9e1/0xb70 net/socket.c:2592
___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
__sys_sendmsg+0x170/0x220 net/socket.c:2678
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f797ad9c799
RSP: 002b:00007f797bc94028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f797b016090 RCX: 00007f797ad9c799
RDX: 0000000000000080 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007f797ae32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f797b016128 R14: 00007f797b016090 R15: 00007ffdb661b6a8
task:syz.1.702 state:R running task stack:28392 pid:8755 tgid:8752 ppid:5805 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0xfee/0x6120 kernel/sched/core.c:6908
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7235
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5872
Code: 05 3b ab 28 12 83 f8 07 0f 87 f0 00 00 00 48 0f a3 05 06 9d f4 0e 0f 82 c2 02 00 00 8b 35 ee d0 f4 0e 85 f6 0f 85 dd 00 00 00 <48> 8b 44 24 30 65 48 2b 05 dd aa 28 12 0f 85 02 03 00 00 48 83 c4
RSP: 0018:ffffc900034c7688 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8de4ec18 RDI: ffffffff8c1afaa0
RBP: ffffffff8e7e75e0 R08: 00000000e1bfe1d1 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0xd1/0x1ea0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:165
__reset_page_owner+0x84/0x190 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0x7e1/0x10d0 mm/page_alloc.c:2978
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xe0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4542 [inline]
slab_alloc_node mm/slub.c:4869 [inline]
kmem_cache_alloc_lru_noprof+0x246/0x6e0 mm/slub.c:4888
__d_alloc+0x34/0xa80 fs/dcache.c:1740
d_alloc+0x4a/0x1e0 fs/dcache.c:1819
lookup_one_qstr_excl+0x175/0x250 fs/namei.c:1801
__start_dirop fs/namei.c:2925 [inline]
start_dirop+0x59/0xb0 fs/namei.c:2934
simple_start_creating+0xf9/0x110 fs/libfs.c:2314
debugfs_start_creating.part.0+0x82/0x170 fs/debugfs/inode.c:394
debugfs_start_creating fs/debugfs/inode.c:371 [inline]
__debugfs_create_file+0xb3/0x4f0 fs/debugfs/inode.c:428
debugfs_create_file_full+0x41/0x60 fs/debugfs/inode.c:460
kvm_create_vm_debugfs virt/kvm/kvm_main.c:1067 [inline]
kvm_create_vm virt/kvm/kvm_main.c:1203 [inline]
kvm_dev_ioctl_create_vm virt/kvm/kvm_main.c:5499 [inline]
kvm_dev_ioctl+0x16c7/0x1a50 virt/kvm/kvm_main.c:5541
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c2639c799
RSP: 002b:00007f6c271a8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6c26615fa0 RCX: 00007f6c2639c799
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 00007f6c26432bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c26616038 R14: 00007f6c26615fa0 R15: 00007fff3a551328
rcu: rcu_preempt kthread starved for 243 jiffies! g25057 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:27736 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0xfee/0x6120 kernel/sched/core.c:6908
__schedule_loop kernel/sched/core.c:6990 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7005
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x754/0xd80 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 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: e8 82 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 03 f1 1b 00 fb f4 fc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000a085c8 EFLAGS: 00000242
RAX: 0000000001ce6f0e RBX: 0000000000000003 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffffffff8de74ced RDI: ffffffff8c1afaa0
RBP: ffff888079542140 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000003 R14: ffff8880b853c080 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124447000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002e000 CR3: 0000000074370000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
kvm_wait arch/x86/kernel/kvm.c:1101 [inline]
kvm_wait+0x124/0x160 arch/x86/kernel/kvm.c:1083
pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
__pv_queued_spin_lock_slowpath+0x4b0/0xc00 kernel/locking/qspinlock.c:325
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x1e0/0x260 kernel/locking/spinlock_debug.c:116
spin_lock include/linux/spinlock.h:341 [inline]
__netif_tx_lock include/linux/netdevice.h:4713 [inline]
__dev_queue_xmit+0x2875/0x4800 net/core/dev.c:4831
dev_queue_xmit include/linux/netdevice.h:3384 [inline]
can_send+0x5d7/0xbd0 net/can/af_can.c:279
can_can_gw_rcv net/can/gw.c:569 [inline]
can_can_gw_rcv+0x820/0xca0 net/can/gw.c:458
deliver net/can/af_can.c:575 [inline]
can_rcv_filter+0x157/0x900 net/can/af_can.c:602
can_receive+0x2cb/0x500 net/can/af_can.c:674
can_rcv+0x29e/0x300 net/can/af_can.c:699
__netif_receive_skb_one_core+0x1b2/0x1e0 net/core/dev.c:6164
__netif_receive_skb+0x1f/0x120 net/core/dev.c:6277
process_backlog+0x37a/0x1580 net/core/dev.c:6628
__napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7692
napi_poll net/core/dev.c:7755 [inline]
net_rx_action+0xa40/0xf20 net/core/dev.c:7912
handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: e8 82 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 03 f1 1b 00 fb f4 fc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df0 EFLAGS: 00000242
RAX: 0000000001ce6d43 RBX: ffff88801e6a24c0 RCX: ffffffff8b8f9c75
RDX: 0000000000000000 RSI: ffffffff8de74ced RDI: ffffffff8c1afaa0
RBP: 0000000000000001 R08: 0000000000000001 R09: ffffed10170a6795
R10: ffff8880b8533cab R11: 0000000000000000 R12: ffffed1003cd4498
R13: 0000000000000001 R14: ffffffff90d98210 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x35b/0x4b0 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148