rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8553/1:b..l
(detected by 0, t=10503 jiffies, g=60157, q=700 ncpus=2)
task:syz.2.364 state:R running task stack:25040 pid:8553 ppid:8548 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6562
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6731
preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6755
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
filemap_map_pages+0xf0f/0x11e0 mm/filemap.c:3531
do_fault_around mm/memory.c:4598 [inline]
do_read_fault mm/memory.c:4624 [inline]
do_fault mm/memory.c:4758 [inline]
handle_pte_fault mm/memory.c:5029 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x25e5/0x3d40 mm/memory.c:5292
faultin_page mm/gup.c:1026 [inline]
__get_user_pages+0x40d/0xec0 mm/gup.c:1250
__get_user_pages_locked mm/gup.c:1454 [inline]
get_dump_page+0x18c/0x670 mm/gup.c:1952
dump_user_range+0x123/0x840 fs/coredump.c:975
elf_core_dump+0x30ca/0x3630 fs/binfmt_elf.c:2354
do_coredump+0x16c1/0x2480 fs/coredump.c:824
get_signal+0x1093/0x1340 kernel/signal.c:2858
arch_do_signal_or_restart+0xc4/0x1310 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: 0033:0x0
RSP: 002b:0000200000000508 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc036a26090 RCX: 00007fc03679de59
RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000002000000
RBP: 00007fc036833e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc036a26128 R14: 00007fc036a26090 R15: 00007ffc000e2b08
rcu: rcu_preempt kthread starved for 10541 jiffies! g60157 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:26800 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x107f/0x4030 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+0x303/0x1350 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8555 Comm: syz.6.355 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__local_bh_enable_ip+0x1/0x1c0 kernel/softirq.c:399
Code: 0b eb d0 48 c7 c1 64 56 21 8e 80 e1 07 80 c1 03 38 c1 7c a0 48 c7 c7 64 56 21 8e e8 e9 0c 84 00 eb 92 0f 1f 80 00 00 00 00 55 <48> 89 e5 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec 60 89 f3 65 48
RSP: 0018:ffffc900001e0770 EFLAGS: 00000206
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 19d7601fc5a84300
RDX: 0000000000000100 RSI: 0000000000000200 RDI: ffffffff88d9f5e1
RBP: ffffc900001e0960 R08: ffffc900001e08df R09: ffffc900001e08c0
R10: dffffc0000000000 R11: fffff5200003c11c R12: 1ffff9200003c114
R13: 0000000000000001 R14: ffff888026a96040 R15: 0000000000000001
FS: 00007ff3c71b86c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28287eb540 CR3: 000000001e3b0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
local_bh_enable include/linux/bottom_half.h:33 [inline]
ipt_do_table+0x1371/0x1580 net/ipv4/netfilter/ip_tables.c:359
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xb9/0x200 net/netfilter/core.c:614
nf_hook include/linux/netfilter.h:257 [inline]
NF_HOOK+0x219/0x3b0 include/linux/netfilter.h:300
__netif_receive_skb_one_core net/core/dev.c:5619 [inline]
__netif_receive_skb+0xcc/0x290 net/core/dev.c:5733
process_backlog+0x37c/0x710 net/core/dev.c:6061
__napi_poll+0xbb/0x460 net/core/dev.c:6628
napi_poll net/core/dev.c:6695 [inline]
net_rx_action+0x622/0xbc0 net/core/dev.c:6809
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:finish_task_switch+0x267/0x8e0 kernel/sched/core.c:5124
Code: d6 08 85 c0 0f 84 38 01 00 00 48 85 db 0f 85 57 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 d3 e3 e0 08 e8 8e 04 2f 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc900037a78c0 EFLAGS: 00000282
RAX: 19d7601fc5a84300 RBX: 0000000000000000 RCX: 19d7601fc5a84300
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf42e0
RBP: ffffc900037a7910 R08: ffffffff90b1027f R09: 1ffffffff216204f
R10: dffffc0000000000 R11: fffffbfff2162050 R12: ffff88802ff20000
R13: 1ffff110171e76fa R14: dffffc0000000000 R15: ffff8880b8f3b7d0
context_switch kernel/sched/core.c:5248 [inline]
__schedule+0x1087/0x4030 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:perf_trace_init+0x9e/0x2d0 kernel/trace/trace_event_perf.c:223
Code: e0 2c b8 8c 0f 84 75 01 00 00 4c 89 24 24 4c 8d 63 40 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 17 01 00 00 4d 63 24 24 <4c> 89 ff 4c 89 e6 e8 b7 04 f8 ff 4d 39 e7 0f 85 a9 00 00 00 4c 8d
RSP: 0018:ffffc900037a7c38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8def7d60 RCX: 0000000000080000
RDX: ffffc9000e6e9000 RSI: 00000000000026b1 RDI: 00000000000026b2
RBP: 0000000000000002 R08: ffffffff8e2121af R09: 1ffffffff1c42435
R10: dffffc0000000000 R11: fffffbfff1c42436 R12: 0000000000000c6b
R13: 0000000000000000 R14: dffffc0000000000 R15: 000000000000011d
perf_tp_event_init+0x89/0x110 kernel/events/core.c:10119
perf_try_init_event+0x12b/0x3d0 kernel/events/core.c:11634
perf_init_event kernel/events/core.c:11698 [inline]
perf_event_alloc+0xea0/0x21e0 kernel/events/core.c:11990
__do_sys_perf_event_open kernel/events/core.c:12526 [inline]
__se_sys_perf_event_open+0x701/0x1ec0 kernel/events/core.c:12418
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: 0033:0x7ff3c639de59
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:00007ff3c71b8028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007ff3c6625fa0 RCX: 00007ff3c639de59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007ff3c6433e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff3c6626038 R14: 00007ff3c6625fa0 R15: 00007ffc1cb8d1e8