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Fri, 11 Jul 2025 06:28:29 -0700 (PDT) Date: Fri, 11 Jul 2025 06:28:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6871117d.a00a0220.26a83e.004c.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in wb_workfn (4) From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 57FBD180002 X-Stat-Signature: jt499i5yo4rej4yzg88atawxbeag1ah5 X-Rspam-User: X-HE-Tag: 1752240510-40346 X-HE-Meta: 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 bZJ6A9Er 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 0GrySWx0 dULBZL/tMc3mh0Z6xIiF3u3yn7IkPOlJeNIZWgD5Q8MG7I9+oMZ/OvyPo/n84qvZ/OgpeWTkSEfTpNvR8VmFOIBXw0rXfHKPfryM4leBmlRcVmjYU9yGYL/LKYRoUD+xkSuEV3tTy7jXX7RDmXu0DHchp2aoNmiegW7YQwJ0tE9g2J5eucJEiLHKcmbmA9bc9YMpA+By+kOoNmEXP4zQRC/Qzci4Dh8fDl0tk3523XpWOpvHxWYR3Z9XUASmoH5E08MIncVCC6gvayDkz0jjNzKy0zRLSmenUbMoDddHxf1LMYL9bqK27/B4OuB686auS8b8Dt+gFkiwd/SwPdKjCutDM1+7qix3HXdMSDxGFsp+9MnTXZT0RMLJI/HzL+1xUAaNasErI4DX2zVXgIntT3xPfqiaq5cZaFt8wAuSvTw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: d7b8f8e20813 Linux 6.16-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10a4128c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f51185bd4f40ad44 dashboard link: https://syzkaller.appspot.com/bug?extid=5b4f4f81240931b16844 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f933e0e4a6c5/disk-d7b8f8e2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a82be954c91b/vmlinux-d7b8f8e2.xz kernel image: https://storage.googleapis.com/syzbot-assets/66dbc3de1264/bzImage-d7b8f8e2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5b4f4f81240931b16844@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P49/2:b..l rcu: (detected by 1, t=10503 jiffies, g=31169, q=1383791 ncpus=2) task:kworker/u8:3 state:R running task stack:21880 pid:49 tgid:49 ppid:2 task_flags:0x24208160 flags:0x00004000 Workqueue: writeback wb_workfn (flush-250:0) Call Trace: context_switch kernel/sched/core.c:5401 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6790 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7113 irqentry_exit+0x36/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_release+0xa/0x2f0 kernel/locking/lockdep.c:5879 Code: 8b 4c 24 18 4c 8b 54 24 10 44 8b 5c 24 0c eb 8c 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 <41> 54 49 89 f4 53 48 89 fb 48 83 ec 18 65 48 8b 05 f9 07 38 12 48 RSP: 0018:ffffc90000b966d8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90000b96bd0 RCX: ffffc90000b98001 RDX: 0000000000000000 RSI: ffffffff816acad4 RDI: ffffffff8e5c4940 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000f4f1 R12: ffffc90000b967b8 R13: ffffc90000b96768 R14: ffffc90000b96bd0 R15: ffffc90000b9679c rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x3f9/0x20a0 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:47 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548 __call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3094 slab_free_hook mm/slub.c:2345 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x16d/0x4d0 mm/slub.c:4745 mempool_free+0xe7/0x3b0 mm/mempool.c:548 bio_put_percpu_cache block/bio.c:801 [inline] bio_put+0x355/0x5b0 block/bio.c:820 bio_endio+0x70a/0x850 block/bio.c:1645 blk_update_request+0x96b/0x1630 block/blk-mq.c:987 blk_mq_end_request+0x5b/0x630 block/blk-mq.c:1149 blk_mq_complete_request block/blk-mq.c:1327 [inline] blk_mq_complete_request+0x8b/0xb0 block/blk-mq.c:1324 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:2826 [inline] __blk_mq_flush_list+0x97/0xc0 block/blk-mq.c:2822 blk_mq_dispatch_queue_requests+0x184/0x7b0 block/blk-mq.c:2871 blk_mq_flush_plug_list+0x1f2/0x600 block/blk-mq.c:2959 blk_add_rq_to_plug+0x1ca/0x540 block/blk-mq.c:1388 blk_mq_submit_bio+0x18d5/0x26a0 block/blk-mq.c:3208 __submit_bio+0x3cf/0x690 block/blk-core.c:635 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x660/0xd30 block/blk-core.c:751 submit_bio_noacct+0x50d/0x1eb0 block/blk-core.c:874 __block_write_full_folio+0x735/0xe00 fs/buffer.c:1939 block_write_full_folio+0x341/0x400 fs/buffer.c:2760 blkdev_writepages+0xb8/0x140 block/fops.c:483 do_writepages+0x27a/0x600 mm/page-writeback.c:2636 __writeback_single_inode+0x160/0xfb0 fs/fs-writeback.c:1680 writeback_sb_inodes+0x601/0xf90 fs/fs-writeback.c:1976 __writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2047 wb_writeback+0x7f3/0xb70 fs/fs-writeback.c:2158 wb_check_old_data_flush fs/fs-writeback.c:2262 [inline] wb_do_writeback fs/fs-writeback.c:2315 [inline] wb_workfn+0x8ca/0xbe0 fs/fs-writeback.c:2343 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup