rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P30040/1:b..l rcu: (detected by 1, t=10503 jiffies, g=211425, q=475 ncpus=2) task:syz-executor state:R running task stack:20704 pid:30040 tgid:30040 ppid:30017 flags:0x20004002 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x184f/0x4c30 kernel/sched/core.c:6690 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012 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 kernel/rcu/tree.c:4767 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0x4/0x120 kernel/rcu/tree.c:4771 Code: 7a 03 e9 53 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <41> 57 41 56 53 65 8b 0d 58 b3 88 7e b0 01 f7 c1 00 00 f0 00 0f 85 RSP: 0018:ffffc90005027520 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88801e7b5a00 RDX: 0000000000000000 RSI: ffffffff8c610840 RDI: ffffffff8c610800 RBP: 0000000000000120 R08: ffffffff820b725e R09: 1ffffffff2859b00 R10: dffffc0000000000 R11: fffffbfff2859b01 R12: 000000000004cb01 R13: ffffea000132c048 R14: ffffffff820b7190 R15: ffff88801bd80000 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline] rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349 lookup_page_ext mm/page_ext.c:254 [inline] page_ext_get+0x192/0x2a0 mm/page_ext.c:526 __reset_page_owner+0x30/0x430 mm/page_owner.c:290 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 discard_slab mm/slub.c:2677 [inline] __put_partials+0xeb/0x130 mm/slub.c:3145 put_cpu_partial+0x17c/0x250 mm/slub.c:3220 __slab_free+0x2ea/0x3d0 mm/slub.c:4449 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:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822 security_inode_getattr+0x130/0x330 security/security.c:2373 vfs_getattr+0x45/0x430 fs/stat.c:204 vfs_statx_path fs/stat.c:251 [inline] vfs_statx+0x199/0x490 fs/stat.c:315 do_statx fs/stat.c:728 [inline] __do_sys_statx fs/stat.c:795 [inline] __se_sys_statx+0x208/0x2b0 fs/stat.c:771 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7eff579 RSP: 002b:00000000f74eea40 EFLAGS: 00000206 ORIG_RAX: 000000000000017f RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000f74eeda0 RDX: 0000000000000900 RSI: 00000000000007ff RDI: 00000000f74eeafc RBP: 00000000f74eec60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10309 jiffies! g211425 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:24432 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x184f/0x4c30 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 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 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x6c7/0x22d0 arch/x86/kernel/unwind_orc.c:494 Code: 00 4d 89 ec 4d 89 ee 48 89 e8 4c 29 f0 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 1c 46 48 89 d8 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 48 63 03 48 RSP: 0018:ffffc90000156210 EFLAGS: 00000a06 RAX: 1ffffffff206bdb4 RBX: ffffffff9035eda0 RCX: 0000000000000009 RDX: 00000000000b0001 RSI: ffffffff90af7c56 RDI: 0000000000000001 RBP: ffffffff9035edb4 R08: 000000000000000a R09: ffffc900001563d0 R10: ffffc90000156330 R11: ffffffff818092c0 R12: ffffffff9035ed90 R13: ffffffff9035ed90 R14: ffffffff9035ed90 R15: ffffffff81fe656e FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f50f2ad8 CR3: 0000000032de8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kmem_cache_free+0x1a2/0x420 mm/slub.c:4681 packet_rcv+0x16f/0x14b0 net/packet/af_packet.c:2290 dev_queue_xmit_nit+0xad4/0xc10 net/core/dev.c:2347 xmit_one net/core/dev.c:3584 [inline] dev_hard_start_xmit+0x15f/0x7e0 net/core/dev.c:3604 __dev_queue_xmit+0x1b11/0x3ed0 net/core/dev.c:4432 dev_queue_xmit include/linux/netdevice.h:3094 [inline] br_dev_queue_push_xmit+0x703/0x8d0 net/bridge/br_forward.c:53 NF_HOOK+0x3a7/0x460 include/linux/netfilter.h:314 br_forward_finish+0xd8/0x130 net/bridge/br_forward.c:66 NF_HOOK+0x3a7/0x460 include/linux/netfilter.h:314 __br_forward+0x489/0x660 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:190 br_flood+0x2e4/0x660 net/bridge/br_forward.c:236 br_handle_frame_finish+0x18ba/0x1fe0 net/bridge/br_input.c:215 nf_hook_bridge_pre net/bridge/br_input.c:299 [inline] br_handle_frame+0xbf8/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x13e8/0x4570 net/core/dev.c:5564 __netif_receive_skb_one_core net/core/dev.c:5668 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5783 process_backlog+0x662/0x15b0 net/core/dev.c:6115 __napi_poll+0xcb/0x490 net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6970 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:927 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: 50456 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) net_ratelimit: 63051 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:5a:32:16:34:6a:6d, vlan:0)