rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9051
(detected by 1, t=10506 jiffies, g=34305, q=466 ncpus=2)
task:syz.4.1612 state:R running task stack:25712 pid:9051 ppid:4283 flags:0x00004002
Call Trace:
sched_show_task+0x497/0x5b0 kernel/sched/core.c:8954
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
print_other_cpu_stall+0x10a9/0x1430 kernel/rcu/tree_stall.h:606
check_cpu_stall kernel/rcu/tree_stall.h:778 [inline]
rcu_pending kernel/rcu/tree.c:3895 [inline]
rcu_sched_clock_irq+0x88a/0x1230 kernel/rcu/tree.c:2394
update_process_times+0x143/0x1b0 kernel/time/timer.c:2072
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1501
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x50b/0xd50 kernel/time/hrtimer.c:1815
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1877
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:mac80211_hwsim_tx_frame_no_nl+0x78d/0x12c0 drivers/net/wireless/mac80211_hwsim.c:1691
Code: 24 20 01 00 00 48 c7 84 24 28 01 00 00 00 00 00 00 4c 39 6c 24 38 74 6d 4d 8d b5 08 3d 00 00 4c 89 f0 48 c1 e8 03 0f b6 04 18 <84> c0 0f 85 f0 06 00 00 41 80 3e 00 74 57 4d 8d b5 09 3d 00 00 4c
RSP: 0018:ffffc900001e0940 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807c5d1e00
RDX: 0000000000000100 RSI: 0000000000000004 RDI: ffffc900001e08c0
RBP: ffffc900001e0ae0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c118 R12: 1ffff9200003c140
R13: ffff88807db7b320 R14: ffff88807db7f028 R15: ffff88807d4c35b8
mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/mac80211_hwsim.c:2058
mac80211_hwsim_beacon_tx+0x61e/0xae0 drivers/net/wireless/mac80211_hwsim.c:2121
__iterate_interfaces+0x243/0x500 net/mac80211/util.c:788
ieee80211_iterate_active_interfaces_atomic+0xd7/0x170 net/mac80211/util.c:824
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1832
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_switch+0x25/0xe0 kernel/kcov.c:348
Code: 0f 1f 44 00 00 48 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 08 0f 92 c0 b2 8b d2 ea 20 c2 80 fa 01 0f 85 b3 00 00 00 48 8b 06 <48> 85 c0 0f 84 a7 00 00 00 41 57 41 56 41 54 53 48 8b 0c cd d8 2f
RSP: 0018:ffffc90005bcf4b0 EFLAGS: 00000246
RAX: 0000000000000020 RBX: 000000642e523ef5 RCX: 0000000000000003
RDX: ffffc9000ea1a001 RSI: ffffffff8cb768c0 RDI: 0000000000000005
RBP: 0000000000000005 R08: ffff88807c5d1e00 R09: 0000000000000020
R10: 000000000000001f R11: 0000000000000002 R12: 00000000000ba6a5
R13: 0000000000000330 R14: dffffc0000000000 R15: ffff8880177ea340
check_buffer+0x2ac/0x900 kernel/trace/ring_buffer.c:3492
__rb_reserve_next+0x511/0xd70 kernel/trace/ring_buffer.c:3621
rb_reserve_next_event kernel/trace/ring_buffer.c:3756 [inline]
ring_buffer_lock_reserve+0xafa/0xf10 kernel/trace/ring_buffer.c:3815
__trace_buffer_lock_reserve kernel/trace/trace.c:956 [inline]
trace_event_buffer_lock_reserve+0x1ce/0x6f0 kernel/trace/trace.c:2843
trace_event_buffer_reserve+0x2a8/0x3d0 kernel/trace/trace_events.c:647
do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_event_raw_event_bpf_trace_printk+0x112/0x230 kernel/trace/bpf_trace.h:11
trace_bpf_trace_printk+0x199/0x220 kernel/trace/bpf_trace.h:11
____bpf_trace_printk kernel/trace/bpf_trace.c:391 [inline]
bpf_trace_printk+0x13e/0x1c0 kernel/trace/bpf_trace.c:374
bpf_prog_6b6697f7147dac0a+0x3d/0x60
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_test_run+0x4c1/0x830 net/bpf/test_run.c:402
bpf_prog_test_run_skb+0xd88/0x1890 net/bpf/test_run.c:1222
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695
__sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5049
__do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7834d9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7835bdf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7835015fa0 RCX: 00007f7834d9ce59
RDX: 0000000000000050 RSI: 0000200000000180 RDI: 000000000000000a
RBP: 00007f7834e32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7835016038 R14: 00007f7835015fa0 R15: 00007fff363b96d8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10429 jiffies! g34305 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=21074
rcu: rcu_preempt kthread starved for 10430 jiffies! g34305 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27248 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8970 Comm: syz.2.1583 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:is_idle_task include/linux/sched.h:1929 [inline]
RIP: 0010:irq_enter_rcu+0x76/0xe0 kernel/softirq.c:641
Code: b6 04 30 84 c0 75 73 c7 03 00 00 00 00 e8 12 f7 df 08 65 48 8b 3d 4a fb b2 7e 48 8d 5f 2c 48 89 d8 48 c1 e8 03 42 0f b6 04 30 <84> c0 75 30 f6 03 02 74 1e 65 8b 05 32 fb b2 7e 25 00 ff ff 00 3d
RSP: 0018:ffffc90000007d28 EFLAGS: 00000803
RAX: 0000000000000000 RBX: ffff888079953c2c RCX: db2079cdc56b3900
RDX: 0000000000000000 RSI: ffffffff8adf2040 RDI: ffff888079953c00
RBP: 0000000000000000 R08: ffffffff8e2029ef R09: 1ffffffff1c4053d
R10: dffffc0000000000 R11: fffffbfff1c4053e R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5316610d58 CR3: 000000005b042000 CR4: 00000000003506f0
DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x45/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1c8/0x930 kernel/softirq.c:584
Code: 89 7c 24 44 0f b7 db 48 c7 c7 80 10 8b 8a e8 0f 00 e0 08 65 66 c7 05 65 34 b4 7e 00 00 e8 40 79 39 00 fb 49 c7 c6 c0 a0 80 8c <89> 5c 24 4c b8 ff ff ff ff 0f bc 44 24 4c 41 89 c5 41 ff c5 0f 84
RSP: 0018:ffffc90000007e00 EFLAGS: 00000286
RAX: db2079cdc56b3900 RBX: 0000000000000200 RCX: db2079cdc56b3900
RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060
RBP: ffffc90000007f30 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8c80a0c0 R15: 000000000000000a
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x0/0x510 kernel/rcu/tree_plugin.h:630
Code: 16 45 66 00 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 94 49 89 fd 4c 89 f7 e8 fc 44 66 00 4c 89 ef eb 84 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec c0 00
RSP: 0018:ffffc9000573f098 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88807995403c RCX: ffff888079953c00
RDX: 0000000000000000 RSI: ffffffff8adf2040 RDI: ffff888079953c00
RBP: dffffc0000000000 R08: ffff88801a92f4ff R09: 1ffff11003525e9f
R10: dffffc0000000000 R11: ffffed1003525ea0 R12: 1ffff1100f32a807
R13: 0000000000000000 R14: ffff888079954040 R15: dffffc0000000000
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
page_ext_put+0x91/0xb0 mm/page_ext.c:182
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1486 [inline]
free_pcp_prepare mm/page_alloc.c:1536 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413
free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554
release_pages+0x1fa6/0x2220 mm/swap.c:1035
__pagevec_release+0x6d/0xe0 mm/swap.c:1055
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
shmem_undo_range+0x7c2/0x20c0 mm/shmem.c:946
shmem_truncate_range mm/shmem.c:1062 [inline]
shmem_evict_inode+0x25b/0xa80 mm/shmem.c:1171
evict+0x4c9/0x8d0 fs/inode.c:705
__dentry_kill+0x431/0x650 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfa/0x1d0 fs/dcache.c:918
__fput+0x5e0/0x920 fs/file_table.c:328
task_work_run+0x1d0/0x260 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0x982/0x2480 kernel/exit.c:881
do_group_exit+0x217/0x2d0 kernel/exit.c:1024
get_signal+0x1272/0x1350 kernel/signal.c:2871
arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1485
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f5315652b27
Code: Unable to access opcode bytes at 0x7f5315652afd.
RSP: 002b:00007f53165f1120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f531579ce59
RDX: 00007f53165f1140 RSI: 00007f53165f1270 RDI: 000000000000000b
RBP: 00007f5315832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f5315a16128 R14: 00007f5315a16090 R15: 00007ffded42f258