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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:170f:b0:431:d763:193b with SMTP id e9e14a558f8ab-4320f79b3e8mr21701555ab.24.1761599912295; Mon, 27 Oct 2025 14:18:32 -0700 (PDT) Date: Mon, 27 Oct 2025 14:18:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68ffe1a8.050a0220.3344a1.03a1.GAE@google.com> Subject: [syzbot] [nilfs?] WARNING: ODEBUG bug in nilfs_detach_log_writer (2) From: syzbot To: konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org, linux-nilfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b98c94eed4a9 arm64: mte: Do not warn if the page is alread.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=14144be2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=158bd6857eb7a550 dashboard link: https://syzkaller.appspot.com/bug?extid=24d8b70f039151f65590 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ce5d2f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16136e7c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2c82e514449b/disk-b98c94ee.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a322ed38c368/vmlinux-b98c94ee.xz kernel image: https://storage.googleapis.com/syzbot-assets/059db7d7114e/Image-b98c94ee.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/3ad719caa640/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+24d8b70f039151f65590@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: __ll_sc_atomic64_andnot arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: arch_atomic64_andnot arch/arm64/include/asm/atomic.h:64 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: raw_atomic64_andnot include/linux/atomic/atomic-arch-fallback.h:3675 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: raw_atomic_long_andnot include/linux/atomic/atomic-long.h:964 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: arch_clear_bit include/asm-generic/bitops/atomic.h:25 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: clear_bit include/asm-generic/bitops/instrumented-atomic.h:42 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: clear_nilfs_purging fs/nilfs2/the_nilfs.h:206 [inline] ODEBUG: free active (active state 0) object: 00000000dacb411a object type: timer_list hint: nilfs_construction_timeout+0x0/0x50 fs/nilfs2/segment.c:2893 WARNING: CPU: 0 PID: 6673 at lib/debugobjects.c:615 debug_print_object lib/debugobjects.c:612 [inline] WARNING: CPU: 0 PID: 6673 at lib/debugobjects.c:615 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] WARNING: CPU: 0 PID: 6673 at lib/debugobjects.c:615 debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129 Modules linked in: CPU: 0 UID: 0 PID: 6673 Comm: syz-executor Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : debug_print_object lib/debugobjects.c:612 [inline] pc : __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] pc : debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129 lr : debug_print_object lib/debugobjects.c:612 [inline] lr : __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] lr : debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129 sp : ffff8000a1547910 x29: ffff8000a1547950 x28: ffff0000cf608400 x27: 0000000000000000 x26: ffff80008aed7f20 x25: ffff0000cf608270 x24: ffff800082080a4c x23: ffff0000d8cabfc0 x22: ffff0000cf608000 x21: dfff800000000000 x20: 0000000000000000 x19: ffff0000cf608000 x18: 00000000ffffffff x17: 626f206131313462 x16: ffff800082de9540 x15: 0000000000000001 x14: 1fffe000337db6fa x13: 0000000000000000 x12: 0000000000000000 x11: ffff6000337db6fb x10: 0000000000ff0100 x9 : c941407f25652900 x8 : c941407f25652900 x7 : ffff8000805638d4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000807d4f2c x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: debug_print_object lib/debugobjects.c:612 [inline] (P) __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] (P) debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129 (P) slab_free_hook mm/slub.c:2454 [inline] slab_free mm/slub.c:6611 [inline] kfree+0x120/0x600 mm/slub.c:6818 nilfs_segctor_destroy fs/nilfs2/segment.c:2811 [inline] nilfs_detach_log_writer+0x668/0x8cc fs/nilfs2/segment.c:2877 nilfs_put_super+0x4c/0x12c fs/nilfs2/super.c:509 generic_shutdown_super+0x12c/0x2b8 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 136662 hardirqs last enabled at (136661): [] vprintk_store+0x898/0xac8 kernel/printk/printk.c:2329 hardirqs last disabled at (136662): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434 softirqs last enabled at (136170): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (136168): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer NILFS (loop1): disposed unprocessed dirty file(s) when stopping log writer --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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