rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7077/1:b..l rcu: (detected by 0, t=10503 jiffies, g=21461, q=6560 ncpus=2) task:syz.3.308 state:R running task stack:23928 pid:7077 tgid:7076 ppid:5853 task_flags:0x2040054c flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:kasan_save_stack+0x48/0x60 mm/kasan/common.c:48 Code: 89 e7 ba 00 02 00 00 4c 89 ff 31 f6 e8 71 90 5b 09 4c 89 ff be 40 00 00 00 31 d2 e8 62 66 89 ff 4c 89 ff 89 c6 44 89 f2 89 d9 73 4c e3 02 48 8d 65 e8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc 0f RSP: 0018:ffffc90003896910 EFLAGS: 00000246 RAX: 000000000000001d RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000001d RDI: ffffc90003896910 RBP: ffffc90003896b38 R08: 0000000000000000 R09: ffffffff81cee2f6 R10: ffffc90003896818 R11: ffffffff81ac8020 R12: dffffc0000000000 R13: 1ffff92000712d7c R14: 0000000000000000 R15: ffffc90003896910 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3123 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243 slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x309/0x400 mm/slub.c:4782 blk_update_request+0x57e/0xe60 block/blk-mq.c:989 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1151 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+0xbfe/0xe30 drivers/block/null_blk/main.c:1693 null_queue_rqs+0x123/0x270 drivers/block/null_blk/main.c:1707 __blk_mq_flush_list block/blk-mq.c:2828 [inline] blk_mq_dispatch_queue_requests+0x414/0x800 block/blk-mq.c:2873 blk_mq_flush_plug_list+0x432/0x550 block/blk-mq.c:2961 blk_add_rq_to_plug+0x175/0x450 block/blk-mq.c:1390 blk_mq_submit_bio+0xbcb/0x2520 block/blk-mq.c:3212 __submit_bio+0x207/0x5a0 block/blk-core.c:635 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x4ab/0xb50 block/blk-core.c:751 __block_write_full_folio+0x810/0xe10 fs/buffer.c:1933 blkdev_writepages+0xd1/0x170 block/fops.c:483 do_writepages+0x32b/0x550 mm/page-writeback.c:2634 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] filemap_write_and_wait_range+0x21f/0x320 mm/filemap.c:691 filemap_write_and_wait include/linux/pagemap.h:68 [inline] sync_blockdev block/bdev.c:260 [inline] bdev_release+0x192/0x650 block/bdev.c:1126 blkdev_release+0x15/0x20 block/fops.c:699 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6b5/0x2300 kernel/exit.c:961 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fda6ab8eb69 RSP: 002b:00007fda689f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000f00000 RBX: 00007fda6adb5fa0 RCX: 00007fda6ab8eb69 RDX: 00000000fffffd2c RSI: 0000200000000000 RDI: 0000000000000008 RBP: 00007fda6ac11df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fda6adb5fa0 R15: 00007ffc925a8a08 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)