rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9867/1:b..l rcu: (detected by 0, t=10503 jiffies, g=54153, q=994 ncpus=2) task:syz-executor state:R running task stack:23968 pid:9867 tgid:9867 ppid:1 task_flags:0x40054c flags:0x00080003 Call Trace: context_switch kernel/sched/core.c:5504 [inline] __schedule+0x125c/0x6730 kernel/sched/core.c:7228 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7552 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x205/0xa00 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline] RIP: 0010:unwind_next_frame+0xcf5/0x2090 arch/x86/kernel/unwind_orc.c:614 Code: 03 00 00 48 89 4c 24 20 3c 02 0f 85 60 f6 ff ff 49 8d 76 f8 ba 08 00 00 00 4d 8d 7d 34 4c 89 ef 48 89 74 24 28 e8 2b f1 ff ff <84> c0 0f 84 4f f6 ff ff 48 8b 7c 24 28 e8 f9 ea ff ff 48 89 ee 48 RSP: 0018:ffffc900052df588 EFLAGS: 00000296 RAX: ffffc900052e0001 RBX: 0000000000000001 RCX: ffffffff91892b3c RDX: ffffc900052df901 RSI: ffffc900052df930 RDI: ffffc900052df608 RBP: ffffc900052df640 R08: ffffffff91892b40 R09: 0000000000000000 R10: ffffc900052df5f8 R11: 0000000000016b61 R12: ffffc900052df648 R13: ffffc900052df5f8 R14: ffffc900052df938 R15: ffffc900052df62c arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x162/0x1e0 mm/page_owner.c:165 __reset_page_owner+0x84/0x190 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] free_pages_prepare+0x586/0xd80 mm/page_alloc.c:1451 __free_contig_range_common+0x14f/0x250 mm/page_alloc.c:6895 __free_contig_range mm/page_alloc.c:6940 [inline] free_pages_bulk+0x12a/0x200 mm/page_alloc.c:5257 vm_area_free_pages+0xad/0x2b0 mm/vmalloc.c:3439 vfree mm/vmalloc.c:3488 [inline] vfree+0x107/0x750 mm/vmalloc.c:3462 kcov_put kernel/kcov.c:447 [inline] kcov_put kernel/kcov.c:443 [inline] kcov_close+0x34/0x60 kernel/kcov.c:554 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1004 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f670c15d68e RSP: 002b:00007ffd05180678 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000555558633500 RCX: 00007f670c15d68e RDX: 00007ffd051806d0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffd0518073c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000057 R13: 0000000000000063 R14: 000000000006718a R15: 00007ffd05180790 net_ratelimit: 20620 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:1) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:1) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:1) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:1) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:1)