rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P28856
(detected by 1, t=10502 jiffies, g=328773, q=1030 ncpus=2)
task:syz.1.17454 state:R running task stack:24656 pid:28856 ppid:23567 flags:0x00004000
Call Trace:
sched_show_task+0x497/0x5b0 kernel/sched/core.c:8955
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
print_other_cpu_stall+0x1054/0x13d0 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+0x88c/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+0x4e7/0xc90 kernel/time/hrtimer.c:1815
hrtimer_interrupt+0x399/0x980 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:unwind_next_frame+0x62e/0x1fd0 arch/x86/kernel/unwind_orc.c:475
Code: e8 03 0f b6 04 28 84 c0 0f 85 ea 14 00 00 49 0f bf 04 24 49 01 c6 e9 a8 08 00 00 4c 8d 73 40 4c 89 f0 48 c1 e8 03 80 3c 28 00 <74> 08 4c 89 f7 e8 c8 76 9a 00 49 8b 16 4d 8d 74 24 01 4c 89 e0 48
RSP: 0018:ffffc900001e0420 EFLAGS: 00000246
RAX: 1ffff9200003c0a1 RBX: ffffc900001e04c8 RCX: ffffffff8e32cdc4
RDX: ffffffff8ea3e3be RSI: ffffffff8e32cdc0 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000001 R09: 000000000000000c
R10: dffffc0000000000 R11: fffff5200003c0a5 R12: ffffffff8ea3e3be
R13: ffffffff8ea3e3c2 R14: ffffc900001e0508 R15: 1ffffffff1d47c78
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
slab_alloc_node mm/slub.c:3359 [inline]
kmem_cache_alloc_node+0x1ad/0x310 mm/slub.c:3404
__alloc_skb+0xf9/0x7d0 net/core/skbuff.c:505
__netdev_alloc_skb+0x114/0x4f0 net/core/skbuff.c:579
netdev_alloc_skb include/linux/skbuff.h:3261 [inline]
dev_alloc_skb include/linux/skbuff.h:3274 [inline]
__ieee80211_beacon_get+0xd5d/0x1520 net/mac80211/tx.c:5368
ieee80211_beacon_get_tim+0x63/0x4e0 net/mac80211/tx.c:5490
ieee80211_beacon_get include/net/mac80211.h:5335 [inline]
mac80211_hwsim_beacon_tx+0x21c/0xae0 drivers/net/wireless/mac80211_hwsim.c:2092
__iterate_interfaces+0x225/0x4c0 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:2148
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
handle_softirqs+0x291/0x910 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:____bpf_clone_redirect net/core/filter.c:2468 [inline]
RIP: 0010:bpf_clone_redirect+0x16c/0x4a0 net/core/filter.c:2445
Code: 49 8b 3c 24 48 8b 74 24 08 e8 f0 50 f6 ff 48 85 c0 0f 84 d7 01 00 00 49 89 c4 4c 89 f7 be 20 0a 00 00 e8 27 66 f1 ff 48 85 c0 <0f> 84 cc 01 00 00 48 89 44 24 10 4c 89 64 24 08 49 8d 7e 70 48 89
RSP: 0018:ffffc9000581f818 EFLAGS: 00000286
RAX: ffff888066316dc0 RBX: 0000000000000000 RCX: ffffffff882ffc36
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88803001cee0
RBP: 0000000000000000 R08: ffff88803001cee3 R09: 1ffff110060039dc
R10: dffffc0000000000 R11: ffffed10060039dd R12: ffff8880271fc000
R13: ffff8880437bb3d0 R14: ffff8880437bb3c0 R15: dffffc0000000000
bpf_prog_bf17f61a12bc632f+0x56/0x5b
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:608 [inline]
bpf_prog_run include/linux/filter.h:615 [inline]
bpf_test_run+0x2b6/0x830 net/bpf/test_run.c:402
bpf_prog_test_run_skb+0xdaf/0x18e0 net/bpf/test_run.c:1222
bpf_prog_test_run+0x31c/0x390 kernel/bpf/syscall.c:3695
__sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5050
__do_sys_bpf kernel/bpf/syscall.c:5136 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5134 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134
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: 0033:0x7f0d33b9e159
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:00007f0d349d9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0d33e25fa0 RCX: 00007f0d33b9e159
RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007f0d33c3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d33e26038 R14: 00007f0d33e25fa0 R15: 00007ffe6a776d68
rcu: rcu_preempt kthread timer wakeup didn't happen for 10461 jiffies! g328773 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=183787
rcu: rcu_preempt kthread starved for 10462 jiffies! g328773 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:26800 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1350 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: 28859 Comm: syz.2.17445 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13
Code: bc 8c 4c 89 f6 e8 9d 65 0b fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 40 68 df 8a 48 c7 c6 80 68 df 8a eb 00 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65
RSP: 0018:ffffc90005cb7760 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff88802e02bc00 RCX: 0000000000000001
RDX: ffff88802e02bc00 RSI: ffffffff8a8c2a20 RDI: ffffffff8adf68a0
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff2161e48
R10: dffffc0000000000 R11: fffffbfff2161e49 R12: 0000000000000000
R13: 0000000000000046 R14: ffffffff8cb2d7e0 R15: ffff88802e02c6e0
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f45eabeb840 CR3: 0000000028ca8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
lock_is_held_type+0x100/0x190 kernel/locking/lockdep.c:5722
trace_call_bpf+0x19e/0x6b0 kernel/trace/bpf_trace.c:135
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10037
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 32 7b 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90005cb7ae0 EFLAGS: 00000206
RAX: ada99f54bc314900 RBX: 1ffff92000b96f64 RCX: ada99f54bc314900
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0
RBP: ffffc90005cb7bd8 R08: ffffffff90b0f24f R09: 1ffffffff2161e49
R10: dffffc0000000000 R11: fffffbfff2161e4a R12: 0000000000000246
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8cb32e18
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock+0x85/0xa0 include/linux/rcupdate.h:823
dput+0xe2/0x1d0 fs/dcache.c:911
__fput+0x597/0x8b0 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+0x9d5/0x2570 kernel/exit.c:887
__do_sys_exit kernel/exit.c:997 [inline]
__se_sys_exit kernel/exit.c:995 [inline]
__x64_sys_exit+0x3c/0x40 kernel/exit.c:995
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: 0033:0x7f199599e159
Code: Unable to access opcode bytes at 0x7f199599e12f.
RSP: 002b:00007f19967bdfd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f1995c26090 RCX: 00007f199599e159
RDX: 00007f19967be9c8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f1995a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1995c26128 R14: 00007f1995c26090 R15: 00007ffdcccb89b8