rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P846
(detected by 0, t=10502 jiffies, g=194417, q=736 ncpus=2)
task:syz.3.7615 state:R running task stack:22896 pid:846 ppid:26202 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+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65
Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01
RSP: 0018:ffffc900063861a8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc90006386288 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc900063862e8
RBP: ffffffff8eaa56f4 R08: ffffc900063862e7 R09: ffffc900063862d8
R10: dffffc0000000000 R11: fffff52000c70c5d R12: 1ffff92000c70c52
R13: dffffc0000000000 R14: ffffc900063862d8 R15: ffffc900063862bd
unwind_next_frame+0xb8a/0x20b0 arch/x86/kernel/unwind_orc.c:546
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:127
__set_page_owner+0x19/0x60 mm/page_owner.c:190
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559
prep_new_page mm/page_alloc.c:2566 [inline]
get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657
alloc_slab_page+0x5d/0x160 mm/slub.c:1799
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1997
___slab_alloc+0xbc6/0x1240 mm/slub.c:3154
__slab_alloc mm/slub.c:3240 [inline]
slab_alloc_node mm/slub.c:3325 [inline]
kmem_cache_alloc_node+0x1e5/0x320 mm/slub.c:3404
__alloc_skb+0xfc/0x7e0 net/core/skbuff.c:505
__pskb_copy_fclone+0xa6/0x1110 net/core/skbuff.c:1771
__pskb_copy include/linux/skbuff.h:1367 [inline]
hsr_create_tagged_frame+0x21f/0xc80 net/hsr/hsr_forward.c:301
hsr_forward_do net/hsr/hsr_forward.c:-1 [inline]
hsr_forward_skb+0xf26/0x20f0 net/hsr/hsr_forward.c:626
hsr_dev_xmit+0x1e3/0x340 net/hsr/hsr_device.c:238
__netdev_start_xmit include/linux/netdevice.h:4894 [inline]
netdev_start_xmit include/linux/netdevice.h:4908 [inline]
xmit_one net/core/dev.c:3695 [inline]
dev_hard_start_xmit+0x262/0x870 net/core/dev.c:3711
__dev_queue_xmit+0x1aa3/0x37c0 net/core/dev.c:4375
dev_queue_xmit include/linux/netdevice.h:3051 [inline]
br_dev_queue_push_xmit+0x6af/0x870 net/bridge/br_forward.c:53
NF_HOOK+0x34d/0x3e0 include/linux/netfilter.h:302
br_forward_finish+0xcf/0x120 net/bridge/br_forward.c:66
NF_HOOK+0x34d/0x3e0 include/linux/netfilter.h:302
__br_forward+0x433/0x610 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:190
br_flood+0x2fc/0x450 net/bridge/br_forward.c:232
br_dev_xmit+0x11a2/0x16f0 net/bridge/br_device.c:-1
__netdev_start_xmit include/linux/netdevice.h:4894 [inline]
netdev_start_xmit include/linux/netdevice.h:4908 [inline]
xmit_one net/core/dev.c:3695 [inline]
dev_hard_start_xmit+0x262/0x870 net/core/dev.c:3711
__dev_queue_xmit+0x1aa3/0x37c0 net/core/dev.c:4375
dev_queue_xmit include/linux/netdevice.h:3051 [inline]
__bpf_tx_skb net/core/filter.c:2134 [inline]
__bpf_redirect_common net/core/filter.c:2182 [inline]
__bpf_redirect+0xbdf/0x1180 net/core/filter.c:2189
____bpf_clone_redirect net/core/filter.c:2473 [inline]
bpf_clone_redirect+0x30b/0x4a0 net/core/filter.c:2436
bpf_prog_2ed4f07f6b249946+0x19/0x1d
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: 0033:0x7f960299ce59
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:00007f9603771028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f9602c15fa0 RCX: 00007f960299ce59
RDX: 0000000000000050 RSI: 00002000000003c0 RDI: 000000000000000a
RBP: 00007f9602a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9602c16038 R14: 00007f9602c15fa0 R15: 00007ffe3805e538
rcu: rcu_preempt kthread timer wakeup didn't happen for 10426 jiffies! g194417 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=107212
rcu: rcu_preempt kthread starved for 10427 jiffies! g194417 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:27440 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 844 Comm: syz.3.7615 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:184 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2c/0x80 kernel/kcov.c:320
Code: 04 24 65 48 8b 0d b4 ef 7f 7e 65 8b 15 b5 ef 7f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 1c 16 00 00 00 74 4e <8b> 91 f8 15 00 00 83 fa 03 75 43 48 8b 91 00 16 00 00 44 8b 89 fc
RSP: 0018:ffffc90005e379c8 EFLAGS: 00000046
RAX: ffffffff81a59e36 RBX: 0000000000000000 RCX: ffff88813fef1e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: ffffffff8cb80500
R13: dffffc0000000000 R14: ffff8880b8f00000 R15: dffffc0000000000
FS: 00005555683e7500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3193e3 CR3: 00000000345a8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000008d24
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
interrupt_context_level include/linux/preempt.h:97 [inline]
get_recursion_context kernel/events/internal.h:214 [inline]
perf_swevent_get_recursion_context+0xa6/0x150 kernel/events/core.c:9755
perf_trace_buf_alloc+0x54/0x300 kernel/trace/trace_event_perf.c:414
perf_trace_preemptirq_template+0x143/0x320 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 82 30 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:ffffc90005e37c00 EFLAGS: 00000206
RAX: 82bf26f3aae13900 RBX: 1ffff92000bc6f88 RCX: 82bf26f3aae13900
RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060
RBP: ffffc90005e37cf8 R08: ffffffff90aff24f R09: 1ffffffff215fe49
R10: dffffc0000000000 R11: fffffbfff215fe4a R12: 0000000000000246
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffff8cb33498
__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+0x5e0/0x920 fs/file_table.c:328
task_work_run+0x1d0/0x260 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f960299ce59
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:00007ffe3805e698 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f9602c17da0 RCX: 00007f960299ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f9602c17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f9602c17cb0 R11: 0000000000000246 R12: 0000000000176106
R13: 00007f9602c15fac R14: 0000000000175e62 R15: 00007ffe3805e7a0