rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6143/2:b..l rcu: (detected by 0, t=10503 jiffies, g=11329, q=4162 ncpus=2) task:syz.0.46 state:R running task stack:25480 pid:6143 tgid:6143 ppid:5825 task_flags:0x2040004c flags:0x00080001 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7256 irqentry_exit+0x36/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5872 Code: cd 08 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 a2 df e9 0e 0f 82 74 02 00 00 8b 35 fa 0f ea 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 b9 cc 08 12 0f 85 c7 02 00 00 48 83 c4 RSP: 0000:ffffc9000b486b10 EFLAGS: 00000206 RAX: 0000000000000046 RBX: ffffffff8e3c45a0 RCX: 00000000c639c71c RDX: 0000000000000000 RSI: ffffffff8da02a09 RDI: ffffffff8bf075c0 RBP: 0000000000000002 R08: f501fefe41178ce3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:559 slab_free_hook mm/slub.c:2500 [inline] slab_free mm/slub.c:6634 [inline] kmem_cache_free+0x15e/0x6c0 mm/slub.c:6744 mempool_free+0x102/0x750 mm/mempool.c:576 bio_put_percpu_cache block/bio.c:805 [inline] bio_put+0x355/0x5b0 block/bio.c:824 bio_endio+0x713/0x860 block/bio.c:1672 blk_update_request+0x93e/0x15f0 block/blk-mq.c:998 blk_mq_end_request+0x4f/0x90 block/blk-mq.c:1160 blk_mq_complete_request block/blk-mq.c:1338 [inline] blk_mq_complete_request+0x8b/0xb0 block/blk-mq.c:1335 nullb_complete_cmd drivers/block/null_blk/main.c:1402 [inline] null_handle_cmd drivers/block/null_blk/main.c:1454 [inline] null_queue_rq+0xb69/0xfd0 drivers/block/null_blk/main.c:1693 null_queue_rqs+0xe9/0x2f0 drivers/block/null_blk/main.c:1707 __blk_mq_flush_list block/blk-mq.c:2837 [inline] __blk_mq_flush_list+0x9a/0xc0 block/blk-mq.c:2833 blk_mq_dispatch_queue_requests+0x184/0x7b0 block/blk-mq.c:2882 blk_mq_flush_plug_list+0x1f2/0x600 block/blk-mq.c:2970 blk_add_rq_to_plug+0x1ca/0x540 block/blk-mq.c:1399 blk_mq_submit_bio+0x1ecc/0x3380 block/blk-mq.c:3222 __submit_bio+0x3cf/0x690 block/blk-core.c:637 __submit_bio_noacct_mq block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x53d/0xc10 block/blk-core.c:755 submit_bio_noacct+0x5bd/0x1f60 block/blk-core.c:879 __block_write_full_folio+0x735/0xe00 fs/buffer.c:1933 block_write_full_folio+0x341/0x400 fs/buffer.c:2753 blkdev_writepages+0xb8/0x140 block/fops.c:491 do_writepages+0x27a/0x600 mm/page-writeback.c:2604 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:379 __filemap_fdatawrite_range+0xb9/0x100 mm/filemap.c:422 filemap_write_and_wait_range mm/filemap.c:694 [inline] filemap_write_and_wait_range+0xa3/0x130 mm/filemap.c:685 filemap_write_and_wait include/linux/pagemap.h:68 [inline] sync_blockdev block/bdev.c:260 [inline] sync_blockdev block/bdev.c:256 [inline] bdev_release+0x4d3/0x6d0 block/bdev.c:1126 blkdev_release+0x15/0x20 block/fops.c:709 __fput+0x402/0xb70 fs/file_table.c:468 task_work_run+0x150/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x86f/0x2bf0 kernel/exit.c:966 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 __do_sys_exit_group kernel/exit.c:1118 [inline] __se_sys_exit_group kernel/exit.c:1116 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1116 x64_sys_call+0x150b/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f23e078f6c9 RSP: 002b:00007fff75d9b018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f23e078f6c9 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fff75d9b07c R08: 0000001275d9b10f R09: 00000000000927c0 R10: 0000000000000150 R11: 0000000000000246 R12: 000000000000000a R13: 00000000000927c0 R14: 00000000000182a8 R15: 00007fff75d9b0d0 bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)