rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5843/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=15717, q=1544743 ncpus=2)
task:syz-executor state:R running task stack:19936 pid:5843 tgid:5843 ppid:5822 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x8/0x90 kernel/kcov.c:288
Code: 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 <65> 48 8b 14 25 c0 d5 03 00 65 8b 05 80 51 64 7e 25 00 01 ff 00 74
RSP: 0018:ffffc9000416fac0 EFLAGS: 00000293
RAX: ffffffff820f4858 RBX: 0000000000000008 RCX: ffff88802750da00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000005
RBP: 00000000000016d3 R08: ffffffff820f4866 R09: 1ffff11003aac358
R10: dffffc0000000000 R11: ffffed1003aac359 R12: 0000000000000005
R13: dffffc0000000000 R14: ffff88801d561b04 R15: ffff88801d561b10
__update_page_owner_free_handle mm/page_owner.c:268 [inline]
__reset_page_owner+0x126/0x430 mm/page_owner.c:298
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659
discard_slab mm/slub.c:2688 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3157
put_cpu_partial+0x17c/0x250 mm/slub.c:3232
__slab_free+0x290/0x380 mm/slub.c:4483
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4119 [inline]
slab_alloc_node mm/slub.c:4168 [inline]
kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175
getname_flags+0xb7/0x540 fs/namei.c:139
user_path_at+0x24/0x60 fs/namei.c:3069
ksys_umount fs/namespace.c:2031 [inline]
__do_sys_umount fs/namespace.c:2039 [inline]
__se_sys_umount fs/namespace.c:2037 [inline]
__x64_sys_umount+0xf1/0x170 fs/namespace.c:2037
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c38b87057
RSP: 002b:00007ffdf2fe0748 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f1c38c018f4 RCX: 00007f1c38b87057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdf2fe0800
RBP: 00007ffdf2fe0800 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdf2fe1880
R13: 00007f1c38c018f4 R14: 00007ffdf2fe18c0 R15: 0000000000000047
rcu: rcu_preempt kthread starved for 1540 jiffies! g15717 f0x2 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:26264 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.13.0-rc7-syzkaller-01131-g8d20dcda404d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:in_task_stack+0x0/0x40 arch/x86/kernel/dumpstack.c:34
Code: 00 48 c7 c7 c0 61 76 8e 4c 89 fe e8 3a 5e 2e f9 e9 51 ff ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 48 8b 4e 20 48 8d b1 00 80 00 00 48 39 f9 41 0f 96 c0
RSP: 0018:ffffc900001e6570 EFLAGS: 00000282
RAX: 1ffff9200003cccf RBX: ffff88801cee8000 RCX: ffffc900001e6660
RDX: ffffc900001e6640 RSI: ffff88801cee8000 RDI: ffffc900001e65e0
RBP: ffffc900001e65e0 R08: ffffc900001e669f R09: 0000000000000000
R10: ffffc900001e6640 R11: fffff5200003ccd4 R12: ffffc900001e6640
R13: ffffc900001e6668 R14: ffffc900001e6660 R15: 1ffff9200003cccd
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32ee5452d8 CR3: 000000005ff4c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
get_stack_info_noinstr+0x1a/0x130 arch/x86/kernel/dumpstack_64.c:173
get_stack_info+0x3c/0xf0 arch/x86/kernel/dumpstack_64.c:199
__unwind_start+0x434/0x740 arch/x86/kernel/unwind_orc.c:729
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
ref_tracker_alloc+0x188/0x490 lib/ref_tracker.c:209
__netdev_tracker_alloc include/linux/netdevice.h:4266 [inline]
netdev_hold include/linux/netdevice.h:4295 [inline]
dst_init+0xee/0x490 net/core/dst.c:52
dst_alloc+0x14f/0x190 net/core/dst.c:93
rt_dst_alloc net/ipv4/route.c:1626 [inline]
__mkroute_output net/ipv4/route.c:2620 [inline]
ip_route_output_key_hash_rcu+0x13cc/0x2390 net/ipv4/route.c:2842
ip_route_output_key_hash+0x193/0x2b0 net/ipv4/route.c:2671
__ip_route_output_key include/net/route.h:169 [inline]
ip_route_output_flow+0x29/0x140 net/ipv4/route.c:2899
ip_route_output_key include/net/route.h:179 [inline]
ip_route_me_harder+0x877/0x1360 net/ipv4/netfilter.c:53
synproxy_send_tcp+0x356/0x6c0 net/netfilter/nf_synproxy_core.c:431
synproxy_send_client_synack+0x8a4/0xe20 net/netfilter/nf_synproxy_core.c:484
nft_synproxy_eval_v4+0x3ca/0x610 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x362/0xa60 net/netfilter/nft_synproxy.c:141
expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
nft_do_chain+0x4ad/0x1da0 net/netfilter/nf_tables_core.c:288
nft_do_chain_inet+0x418/0x6b0 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:269 [inline]
NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
__netif_receive_skb_one_core net/core/dev.c:5837 [inline]
__netif_receive_skb+0x2bf/0x650 net/core/dev.c:5950
process_backlog+0x662/0x15b0 net/core/dev.c:6298
__napi_poll+0xcb/0x490 net/core/dev.c:7115
napi_poll net/core/dev.c:7184 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:7306
handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
run_ksoftirqd+0xca/0x130 kernel/softirq.c:950
smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244