rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5807/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=35433, q=119 ncpus=2)
task:syz-executor state:R running task stack:22616 pid:5807 tgid:5807 ppid:5804 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7256
irqentry_exit+0x36/0x90 kernel/entry/common.c:211
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x79/0x350 kernel/locking/lockdep.c:5872
Code: 82 74 02 00 00 8b 35 aa 40 ea 0e 85 f6 0f 85 8d 00 00 00 48 8b 44 24 30 65 48 2b 05 49 c5 0b 12 0f 85 c7 02 00 00 48 83 c4 38 <5b> 5d 41 5c 41 5d 41 5e 41 5f e9 c8 bc d1 09 65 8b 05 55 c5 0b 12
RSP: 0018:ffffc900035d7130 EFLAGS: 00000296
RAX: 0000000000000000 RBX: ffffffff8e3c4460 RCX: 00000000b5e88f8c
RDX: 0000000000000000 RSI: ffffffff8dae09c4 RDI: ffffffff8bf1de40
RBP: 0000000000000002 R08: 72182be7e97fcce2 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
__page_table_check_zero+0x13d/0x5d0 mm/page_table_check.c:138
page_table_check_alloc include/linux/page_table_check.h:35 [inline]
post_alloc_hook+0x1af/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
__alloc_pages_noprof mm/page_alloc.c:5217 [inline]
alloc_pages_bulk_noprof+0x71c/0x1410 mm/page_alloc.c:5137
___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
__kasan_populate_vmalloc mm/kasan/shadow.c:370 [inline]
kasan_populate_vmalloc+0x112/0x2d0 mm/kasan/shadow.c:435
alloc_vmap_area+0x960/0x29e0 mm/vmalloc.c:2098
__get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3193
__vmalloc_node_range_noprof+0x271/0x1480 mm/vmalloc.c:3857
__vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3960
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+0x6b6/0xae0 net/ipv6/netfilter/ip6_tables.c:1677
nf_getsockopt+0x7c/0xe0 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x1f7/0x280 net/ipv6/ipv6_sockglue.c:1473
tcp_getsockopt+0xa1/0x100 net/ipv4/tcp.c:4810
do_sock_getsockopt+0x34d/0x440 net/socket.c:2421
__sys_getsockopt+0x12f/0x260 net/socket.c:2450
__do_sys_getsockopt net/socket.c:2457 [inline]
__se_sys_getsockopt net/socket.c:2454 [inline]
__x64_sys_getsockopt+0xbd/0x160 net/socket.c:2454
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe9f3d90d0a
RSP: 002b:00007ffda0f4f2f8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffda0f4f380 RCX: 00007fe9f3d90d0a
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffda0f4f31c R09: 0079746972756365
R10: 00007ffda0f4f380 R11: 0000000000000212 R12: 00007fe9f3fb3a20
R13: 00007ffda0f4f31c R14: 0000000000000000 R15: 00007fe9f3fb4e60
rcu: rcu_preempt kthread starved for 10552 jiffies! g35433 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:27816 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0xd/0xc0 kernel/rcu/tree.c:751
Code: 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 65 ff 05 73 d8 02 12 5e e3 c5 09 48 c7 c3 a8 22 a6 93 89 c5 83 f8 07 0f 87 82 00 00
RSP: 0018:ffffc90000007548 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81ce802f
RDX: ffffffff8e097a00 RSI: ffffffff81ce80de RDI: 0000000000000005
RBP: ffffffff91ff6900 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff81a841e0
R13: ffffc90000007678 R14: 0000000000000000 R15: ffffffff8e097a00
FS: 0000000000000000(0000) GS:ffff8881249d1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fae7ff8 CR3: 0000000052ec6000 CR4: 00000000003526f0
Call Trace:
rcu_read_unlock include/linux/rcupdate.h:895 [inline]
is_bpf_text_address+0x123/0x1a0 kernel/bpf/core.c:746
kernel_text_address kernel/extable.c:125 [inline]
kernel_text_address+0x8d/0x100 kernel/extable.c:94
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x59/0xa0 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xa6/0x100 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
kasan_save_track+0x14/0x30 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:342 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4962 [inline]
slab_alloc_node mm/slub.c:5272 [inline]
kmem_cache_alloc_node_noprof+0x28a/0x770 mm/slub.c:5324
kmalloc_reserve+0x18b/0x2c0 net/core/skbuff.c:579
__alloc_skb+0x166/0x380 net/core/skbuff.c:670
skb_copy+0x1c9/0x3a0 net/core/skbuff.c:2125
mac80211_hwsim_tx_frame_no_nl.isra.0+0xb6e/0x13c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891
mac80211_hwsim_tx_frame+0x1f1/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2258
__mac80211_hwsim_beacon_tx drivers/net/wireless/virtual/mac80211_hwsim.c:2275 [inline]
mac80211_hwsim_beacon_tx+0x595/0xa40 drivers/net/wireless/virtual/mac80211_hwsim.c:2359
__iterate_interfaces+0x2e5/0x650 net/mac80211/util.c:761
ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:797
mac80211_hwsim_beacon+0x105/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2389
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x219/0x8e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052
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:82
Code: 57 73 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 43 35 22 00 fb f4 3c 0a 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e007df8 EFLAGS: 000002c6
RAX: 0000000002fda959 RBX: 0000000000000000 RCX: ffffffff8b67f2a9
RDX: 0000000000000000 RSI: ffffffff8db06380 RDI: ffffffff8bf1de40
RBP: fffffbfff1c12f40 R08: 0000000000000001 R09: ffffed1017086655
R10: ffff8880b84332ab R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff8e097a00 R14: ffffffff90833ad0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x38d/0x500 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
rest_init+0x16b/0x2b0 init/main.c:757
start_kernel+0x3f6/0x4e0 init/main.c:1111
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148