rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7722
rcu: (detected by 0, t=10502 jiffies, g=21249, q=1079 ncpus=2)
task:syz.4.737 state:R running task stack:24456 pid:7722 tgid:7721 ppid:5826 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8139
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall+0xfca/0x1380 kernel/rcu/tree_stall.h:681
check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
rcu_pending kernel/rcu/tree.c:3679 [inline]
rcu_sched_clock_irq+0x939/0x1050 kernel/rcu/tree.c:2716
update_process_times+0x234/0x2d0 kernel/time/timer.c:2475
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3bc/0xb10 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x455/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x4e/0xb0 kernel/rcu/tree.c:752
Code: ff df 4c 8d 34 dd 90 a7 8f 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 1c 5a 84 00 48 c7 c3 98 3e 77 92 49 03 1e <48> 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d b9
RSP: 0018:ffffc9001d53e7f8 EFLAGS: 00000283
RAX: 1ffffffff1b1f4f2 RBX: ffff8880b8833e98 RCX: 0000000080000001
RDX: ffffffff90128300 RSI: ffffffff8ba83cc0 RDI: ffffffff8ba83c80
RBP: dffffc0000000000 R08: 0000000000000022 R09: ffffffff8dfc8100
R10: ffffc9001d53e938 R11: ffffffff81afc300 R12: 00007f4e3e0a6028
R13: ffffc9001d538000 R14: ffffffff8d8fa790 R15: dffffc0000000000
rcu_read_unlock include/linux/rcupdate.h:867 [inline]
class_rcu_destructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0x1b76/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6246 [inline]
kfree+0x1c5/0x6c0 mm/slub.c:6561
skb_kfree_head net/core/skbuff.c:1075 [inline]
skb_free_head net/core/skbuff.c:1087 [inline]
skb_release_data+0x828/0xa60 net/core/skbuff.c:1114
skb_release_all net/core/skbuff.c:1189 [inline]
__kfree_skb+0x5d/0x210 net/core/skbuff.c:1203
kfree_skb_reason include/linux/skbuff.h:1322 [inline]
kfree_skb include/linux/skbuff.h:1331 [inline]
veth_xmit+0xaa8/0xda0 drivers/net/veth.c:360
__netdev_start_xmit include/linux/netdevice.h:5343 [inline]
netdev_start_xmit include/linux/netdevice.h:5352 [inline]
xmit_one net/core/dev.c:3888 [inline]
dev_hard_start_xmit+0x2df/0x860 net/core/dev.c:3904
__dev_queue_xmit+0x1428/0x3900 net/core/dev.c:4870
dev_queue_xmit_accel include/linux/netdevice.h:3407 [inline]
macvlan_queue_xmit drivers/net/macvlan.c:571 [inline]
macvlan_start_xmit+0x3ba/0x600 drivers/net/macvlan.c:595
__netdev_start_xmit include/linux/netdevice.h:5343 [inline]
netdev_start_xmit include/linux/netdevice.h:5352 [inline]
xmit_one net/core/dev.c:3888 [inline]
dev_hard_start_xmit+0x2df/0x860 net/core/dev.c:3904
__dev_queue_xmit+0x1428/0x3900 net/core/dev.c:4870
dev_queue_xmit include/linux/netdevice.h:3401 [inline]
__bpf_tx_skb net/core/filter.c:2147 [inline]
__bpf_redirect_common net/core/filter.c:2191 [inline]
__bpf_redirect+0xcfb/0x13c0 net/core/filter.c:2198
____bpf_clone_redirect net/core/filter.c:2488 [inline]
bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2451
bpf_prog_46aad13ec368be47+0x5b/0x64
bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline]
__bpf_prog_run include/linux/filter.h:722 [inline]
bpf_prog_run include/linux/filter.h:729 [inline]
bpf_test_run+0x354/0x830 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0xe2c/0x2260 net/bpf/test_run.c:1192
bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4746
__sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6270
__do_sys_bpf kernel/bpf/syscall.c:6365 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6363 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6363
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e3fe4c819
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:00007f4e3e0a6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4e400c5fa0 RCX: 00007f4e3fe4c819
RDX: 0000000000000050 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007f4e3fee2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e400c6038 R14: 00007f4e400c5fa0 R15: 00007ffefe7e2c98
rcu: rcu_preempt kthread timer wakeup didn't happen for 10432 jiffies! g21249 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=11355
rcu: rcu_preempt kthread starved for 10433 jiffies! g21249 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27768 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x169e/0x54f0 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11b0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 2b 5a 02 e9 c3 c6 03 00 cc cc cc 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 eb 13 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001e7e20 EFLAGS: 00000242
RAX: 0000000000030329 RBX: ffffffff81997a4a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d64dfae RDI: ffffffff8ba83ce0
RBP: ffffc900001e7f10 R08: ffff8880b8933e9b R09: 1ffff110171267d3
R10: dffffc0000000000 R11: ffffed10171267d4 R12: 0000000000000001
R13: 1ffff11003ad1b88 R14: 0000000000000001 R15: 1ffff11003ad1b88
FS: 0000000000000000(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2103241357 CR3: 00000000386f2000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x36a/0x5f0 kernel/sched/idle.c:352
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x147