rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P24640/1:b..l rcu: (detected by 1, t=10503 jiffies, g=95325, q=201 ncpus=2) task:syz.1.9053 state:R running task stack:25304 pid:24640 tgid:24638 ppid:5865 flags:0x00004006 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:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_switch+0x9d/0x120 kernel/kcov.c:351 Code: 00 00 4d 85 d2 0f 84 8b 00 00 00 4c 8b 4c 24 20 65 4c 8b 1c 25 00 d6 03 00 31 d2 eb 08 48 ff c2 49 39 d2 74 71 4c 8b 74 d6 10 <65> 8b 05 74 4d 64 7e 25 00 01 ff 00 74 11 3d 00 01 00 00 75 de 41 RSP: 0018:ffffc9000c437388 EFLAGS: 00000202 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffff888060c95a00 RDX: 0000000000000001 RSI: ffffffff9000ffe0 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000007 R09: ffffffff8bc7276b R10: 0000000000000002 R11: ffff888060c95a00 R12: 1ffff92001886e9b R13: ffffc9000c4374d8 R14: 0000000000000003 R15: ffffffffffffffff xas_find+0xfb/0x960 lib/xarray.c:1262 find_get_entry mm/filemap.c:1982 [inline] find_lock_entries+0x269/0xbb0 mm/filemap.c:2086 mapping_try_invalidate+0x42e/0x550 mm/truncate.c:467 drop_pagecache_sb+0x1ab/0x260 fs/drop_caches.c:40 iterate_supers+0xc6/0x190 fs/super.c:934 drop_caches_sysctl_handler+0x8c/0x160 fs/drop_caches.c:64 proc_sys_call_handler+0x5ec/0x920 fs/proc/proc_sysctl.c:601 do_iter_readv_writev+0x600/0x880 vfs_writev+0x376/0xba0 fs/read_write.c:1050 do_pwritev fs/read_write.c:1146 [inline] __do_sys_pwritev fs/read_write.c:1192 [inline] __se_sys_pwritev fs/read_write.c:1187 [inline] __x64_sys_pwritev+0x1b7/0x2d0 fs/read_write.c:1187 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: 0033:0x7fecbc185d29 RSP: 002b:00007fecbcffa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 00007fecbc375fa0 RCX: 00007fecbc185d29 RDX: 0000000000000003 RSI: 0000000020000800 RDI: 0000000000000003 RBP: 00007fecbc201b08 R08: 0000000000000009 R09: 0000000000000000 R10: 000000000000ffff R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fecbc375fa0 R15: 00007fecbc49fa28 rcu: rcu_preempt kthread starved for 4743 jiffies! g95325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:25880 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: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.13.0-rc7-syzkaller-00019-gc45323b7560e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__in6_dev_get include/net/addrconf.h:330 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:421 [inline] RIP: 0010:find_match+0xb2/0xc10 net/ipv6/route.c:747 Code: e8 23 01 97 f7 4c 89 64 24 40 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 f4 00 97 f7 4c 8b 23 e8 dc 15 5a 01 89 c3 31 ff RSP: 0018:ffffc90000156100 EFLAGS: 00000246 RAX: 1ffff1100c32fc18 RBX: ffff88806197e0c0 RCX: dffffc0000000000 RDX: ffff88801cacda00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88807fc728b8 R08: ffffffff8a6eeb5f R09: ffffc90000156430 R10: ffffc90000156420 R11: fffff5200002ac52 R12: ffffc90000156430 R13: ffff88807fc728cf R14: 1ffff1100ff8e519 R15: 1ffff1100ff8e517 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdc9ed7b08b CR3: 00000000637ba000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __find_rr_leaf+0x275/0x8e0 net/ipv6/route.c:835 find_rr_leaf net/ipv6/route.c:856 [inline] rt6_select net/ipv6/route.c:900 [inline] fib6_table_lookup+0x413/0xbb0 net/ipv6/route.c:2195 ip6_pol_route+0x273/0x15d0 net/ipv6/route.c:2231 pol_lookup_func include/net/ip6_fib.h:616 [inline] fib6_rule_lookup+0x58c/0x790 net/ipv6/fib6_rules.c:117 ip6_route_input_lookup net/ipv6/route.c:2300 [inline] ip6_route_input+0x859/0xd90 net/ipv6/route.c:2596 ip6_rcv_finish+0x144/0x180 net/ipv6/ip6_input.c:77 ip_sabotage_in+0x203/0x290 net/bridge/br_netfilter_hooks.c:1021 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 __netif_receive_skb_one_core net/core/dev.c:5704 [inline] __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5817 netif_receive_skb_internal net/core/dev.c:5903 [inline] netif_receive_skb+0x1e8/0x890 net/core/dev.c:5962 NF_HOOK+0x9e/0x400 include/linux/netfilter.h:314 br_handle_frame_finish+0x18ed/0x1fe0 br_nf_hook_thresh+0x472/0x590 br_nf_pre_routing_finish_ipv6+0xaa0/0xdd0 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x379/0x770 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x14eb/0x4690 net/core/dev.c:5598 __netif_receive_skb_one_core net/core/dev.c:5702 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5817 process_backlog+0x662/0x15b0 net/core/dev.c:6149 __napi_poll+0xcb/0x490 net/core/dev.c:6902 napi_poll net/core/dev.c:6971 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7093 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 net_ratelimit: 4432 callbacks suppressed bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) net_ratelimit: 4208 callbacks suppressed bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on 3@ÿ with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)