rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=bfbc/1/0x4000000000000000 softirq=30608/30608 fqs=339
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5621
rcu: (detected by 1, t=10502 jiffies, g=36389, q=131 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5621 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4855 [inline]
RIP: 0010:__lock_acquire+0x210/0x2630 kernel/locking/lockdep.c:5187
Code: 48 8d 04 80 48 8d 04 80 48 8d 04 c5 60 ab 11 96 0f b6 90 c4 00 00 00 0f b7 43 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 10 46 2d 14 <0f> 83 b6 05 00 00 48 8d 04 80 48 8d 04 80 48 8d 04 c5 60 ab 11 96
RSP: 0018:ffffc90000007c90 EFLAGS: 00000003
RAX: 0000000000000007 RBX: ffff88807c5d30e0 RCX: 0000000000000002
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff8e7e54e0
RBP: ffff88807c5d2500 R08: 0000000000000000 R09: 0000000000080000
R10: ffffffff8e7e54e0 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000007 R14: 0000000000020000 R15: 0000000000000000
FS: 0000555590fc7500(0000) GS:ffff888124372000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 000000005a96b000 CR4: 00000000003526f0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
advance_sched+0x718/0xd20 net/sched/sch_taprio.c:992
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:124 [inline]
RIP: 0010:lock_release+0x75/0x310 kernel/locking/lockdep.c:5881
Code: f3 0e 45 85 c0 0f 84 48 01 00 00 65 8b 05 3b 9c 26 12 85 c0 0f 85 39 01 00 00 65 4c 8b 25 bb 54 26 12 41 8b bc 24 8c 0b 00 00 <85> ff 0f 85 21 01 00 00 48 81 3b 00 a7 11 94 0f 84 14 01 00 00 9c
RSP: 0018:ffffc90003f47760 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8e7e54e0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8c1c3780 RDI: 0000000000000000
RBP: ffffffff827e9857 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: ffff88807c5d2500
R13: 0000000000000024 R14: ffff88813fffb100 R15: 0000000000000001
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock+0x1c/0x60 include/linux/rcupdate.h:869
lruvec_stat_mod_folio+0x22d/0x2e0 mm/memcontrol.c:987
mod_lruvec_page_state include/linux/vmstat.h:528 [inline]
vm_area_alloc_pages mm/vmalloc.c:3709 [inline]
__vmalloc_area_node mm/vmalloc.c:3878 [inline]
__vmalloc_node_range_noprof+0x5e4/0x1630 mm/vmalloc.c:4064
__vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4124
alloc_counters net/ipv6/netfilter/ip6_tables.c:815 [inline]
copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
do_ip6t_get_ctl+0x696/0xac0 net/ipv6/netfilter/ip6_tables.c:1677
nf_getsockopt+0x7c/0xe0 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x207/0x2a0 net/ipv6/ipv6_sockglue.c:1464
tcp_getsockopt+0xa1/0x110 net/ipv4/tcp.c:4870
do_sock_getsockopt+0x50a/0x6e0 net/socket.c:2487
__sys_getsockopt+0x148/0x260 net/socket.c:2518
__do_sys_getsockopt net/socket.c:2525 [inline]
__se_sys_getsockopt net/socket.c:2522 [inline]
__x64_sys_getsockopt+0xbd/0x160 net/socket.c:2522
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b71b9e5aa
Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffec9b155c8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffec9b15650 RCX: 00007f5b71b9e5aa
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffec9b155ec R09: 0000000000000000
R10: 00007ffec9b15650 R11: 0000000000000212 R12: 00007f5b71de9b80
R13: 00007ffec9b155ec R14: 0000000000000000 R15: 00007f5b71deafc0
task:syz-executor state:R running task stack:24040 pid:5621 tgid:5621 ppid:5606 task_flags:0x400140 flags:0x00080010
Call Trace:
rcu: rcu_preempt kthread starved for 9824 jiffies! g36389 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:28904 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
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+0x72b/0xd50 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:
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 04/18/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: d6 92 02 e9 c3 42 03 00 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 e3 00 21 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df0 EFLAGS: 00000246
RAX: 000000000056b52b RBX: ffff88801e2c2500 RCX: ffffffff8b8a9095
RDX: 0000000000000000 RSI: ffffffff8df21135 RDI: ffffffff8c1c3800
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10170a67b5
R10: ffff8880b8533dab R11: 0000000000000000 R12: 0000000000000001
R13: ffffed1003c584a0 R14: 0000000000000001 R15: ffffffff90d7ae50
FS: 0000000000000000(0000) GS:ffff888124472000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558603ea5be0 CR3: 0000000035dd7000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [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:199 [inline]
do_idle+0x464/0x590 kernel/sched/idle.c:352
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148