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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3983:b0:430:c78c:75d6 with SMTP id e9e14a558f8ab-4320f7a5ee9mr39505485ab.2.1761634445589; Mon, 27 Oct 2025 23:54:05 -0700 (PDT) Date: Mon, 27 Oct 2025 23:54:05 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6900688d.050a0220.32483.011d.GAE@google.com> Subject: Re: [syzbot] [nilfs?] WARNING: ODEBUG bug in nilfs_detach_log_writer (2) From: syzbot To: eadavis@qq.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING: ODEBUG bug in nilfs_detach_log_writer sci 000000002fc63a1f sctask 00000000cb1c8b43 nilfs_segctor_destroy ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: 00000000243cd50f 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: 00000000243cd50f object type: timer_list hint: arch_atomic64_andnot arch/arm64/include/asm/atomic.h:64 [inline] ODEBUG: free active (active state 0) object: 00000000243cd50f object type: timer_list hint: raw_atomic64_andnot include/linux/atomic/atomic-arch-fallback.h:3675 [inline] ODEBUG: free active (active state 0) object: 00000000243cd50f object type: timer_list hint: raw_atomic_long_andnot include/linux/atomic/atomic-long.h:964 [inline] ODEBUG: free active (active state 0) object: 00000000243cd50f object type: timer_list hint: arch_clear_bit include/asm-generic/bitops/atomic.h:25 [inline] ODEBUG: free active (active state 0) object: 00000000243cd50f object type: timer_list hint: clear_bit include/asm-generic/bitops/instrumented-atomic.h:42 [inline] ODEBUG: free active (active state 0) object: 00000000243cd50f object type: timer_list hint: clear_nilfs_purging fs/nilfs2/the_nilfs.h:206 [inline] ODEBUG: free active (active state 0) object: 00000000243cd50f object type: timer_list hint: nilfs_construction_timeout+0x0/0x50 fs/nilfs2/segment.c:2899 WARNING: CPU: 1 PID: 7086 at lib/debugobjects.c:615 debug_print_object lib/debugobjects.c:612 [inline] WARNING: CPU: 1 PID: 7086 at lib/debugobjects.c:615 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] WARNING: CPU: 1 PID: 7086 at lib/debugobjects.c:615 debug_check_no_obj_freed+0x390/0x470 lib/debugobjects.c:1129 Modules linked in: CPU: 1 UID: 0 PID: 7086 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 : ffff8000a1b578f0 x29: ffff8000a1b57930 x28: ffff0000dbe26c00 x27: 0000000000000000 x26: ffff80008aed7f20 x25: ffff0000dbe26a70 x24: ffff800082080b44 x23: ffff0000ca04be70 x22: ffff0000dbe26000 x21: dfff800000000000 x20: 0000000000000000 x19: ffff0000dbe26800 x18: 00000000ffffffff x17: 626f206630356463 x16: ffff800082de9640 x15: 0000000000000001 x14: 1ffff0001436ae54 x13: 0000000000000000 x12: 0000000000000000 x11: 00000000778946ad x10: 0000000000ff0100 x9 : 73910471fe57b500 x8 : 73910471fe57b500 x7 : ffff8000805638d4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000002 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:2817 [inline] nilfs_detach_log_writer+0x684/0x9c4 fs/nilfs2/segment.c:2883 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: 393728 hardirqs last enabled at (393727): [] vprintk_store+0x898/0xac8 kernel/printk/printk.c:2329 hardirqs last disabled at (393728): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434 softirqs last enabled at (393526): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (393526): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:650 softirqs last disabled at (392817): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ end trace 0000000000000000 ]--- kthread start to stop (sci 000000005be7e884)sctask 000000008631ea2b, nilfs_segctor_destroy kthread stopped (sci 000000005be7e884)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000009d71d04a)sctask 00000000a0141cfe, nilfs_segctor_destroy kthread stopped (sci 000000009d71d04a)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000002b2f1418)sctask 000000006c451d11, nilfs_segctor_destroy kthread stopped (sci 000000002b2f1418)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000effbdfa6)sctask 00000000a6318a24, nilfs_segctor_destroy kthread stopped (sci 00000000effbdfa6)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000000fdbe516)sctask 0000000026c32dd0, nilfs_segctor_destroy kthread stopped (sci 000000000fdbe516)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000001905d913)sctask 0000000050a4687e, nilfs_segctor_destroy kthread stopped (sci 000000001905d913)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000a3eeddcd)sctask 0000000079f3d7c8, nilfs_segctor_destroy kthread stopped (sci 00000000a3eeddcd)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000095360f23)sctask 0000000017af06a9, nilfs_segctor_destroy kthread stopped (sci 0000000095360f23)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000005a9a2e80)sctask 00000000450f99c2, nilfs_segctor_destroy kthread stopped (sci 000000005a9a2e80)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000a5326494)sctask 000000003bc4f8b8, nilfs_segctor_destroy kthread stopped (sci 00000000a5326494)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000a603b099)sctask 000000008631ea2b, nilfs_segctor_destroy kthread stopped (sci 00000000a603b099)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000affd4105)sctask 0000000064524a43, nilfs_segctor_destroy kthread stopped (sci 00000000affd4105)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000028cafbde)sctask 000000005945da3a, nilfs_segctor_destroy kthread stopped (sci 0000000028cafbde)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000004d042e5c)sctask 0000000034209c98, nilfs_segctor_destroy kthread stopped (sci 000000004d042e5c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000d5a02571)sctask 000000008197e345, nilfs_segctor_destroy kthread stopped (sci 00000000d5a02571)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000cb8a270a)sctask 00000000a075cdeb, nilfs_segctor_destroy kthread stopped (sci 00000000cb8a270a)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000023a2d3ea)sctask 00000000952a7887, nilfs_segctor_destroy kthread stopped (sci 0000000023a2d3ea)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000ce675362)sctask 000000000df5a992, nilfs_segctor_destroy kthread stopped (sci 00000000ce675362)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000576731dc)sctask 0000000082cdf5af, nilfs_segctor_destroy kthread stopped (sci 00000000576731dc)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000e5b3a0b0)sctask 00000000e4102e6b, nilfs_segctor_destroy kthread stopped (sci 00000000e5b3a0b0)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000008c9fa24c)sctask 00000000ca2032a8, nilfs_segctor_destroy kthread stopped (sci 000000008c9fa24c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000072959ad0)sctask 00000000d02d4a8e, nilfs_segctor_destroy kthread stopped (sci 0000000072959ad0)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000dc9d7abc)sctask 00000000979ed9ea, nilfs_segctor_destroy kthread stopped (sci 00000000dc9d7abc)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000b18846c3)sctask 0000000076687d8f, nilfs_segctor_destroy kthread stopped (sci 00000000b18846c3)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000536e8ffd)sctask 000000007798b86f, nilfs_segctor_destroy kthread stopped (sci 00000000536e8ffd)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000006b6f7633)sctask 0000000087ea6322, nilfs_segctor_destroy kthread stopped (sci 000000006b6f7633)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000eadf0db0)sctask 0000000020355604, nilfs_segctor_destroy kthread stopped (sci 00000000eadf0db0)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000007344f784)sctask 00000000e08f1ab4, nilfs_segctor_destroy kthread stopped (sci 000000007344f784)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000010fbc4d9)sctask 00000000f03c335c, nilfs_segctor_destroy kthread stopped (sci 0000000010fbc4d9)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000f46a4493)sctask 00000000ba507f0b, nilfs_segctor_destroy kthread stopped (sci 00000000f46a4493)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000060b110ed)sctask 000000003b1ab5ad, nilfs_segctor_destroy kthread stopped (sci 0000000060b110ed)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000694aac4c)sctask 0000000060a56e61, nilfs_segctor_destroy kthread stopped (sci 00000000694aac4c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000009864c2ac)sctask 000000006e998649, nilfs_segctor_destroy kthread stopped (sci 000000009864c2ac)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000e0e3a3e5)sctask 00000000ac1e6b29, nilfs_segctor_destroy kthread stopped (sci 00000000e0e3a3e5)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000005a10065e)sctask 00000000057002a4, nilfs_segctor_destroy kthread stopped (sci 000000005a10065e)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000e4f1117f)sctask 00000000d1405353, nilfs_segctor_destroy kthread stopped (sci 00000000e4f1117f)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000001b211764)sctask 000000006280584a, nilfs_segctor_destroy kthread stopped (sci 000000001b211764)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000090abbc6)sctask 00000000c3e1a812, nilfs_segctor_destroy kthread stopped (sci 00000000090abbc6)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000006e76001d)sctask 00000000eed8bd1d, nilfs_segctor_destroy kthread stopped (sci 000000006e76001d)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000009c3f81c)sctask 00000000030407b5, nilfs_segctor_destroy kthread stopped (sci 0000000009c3f81c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000006c06e552)sctask 00000000368252a8, nilfs_segctor_destroy kthread stopped (sci 000000006c06e552)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000000ea9b08)sctask 0000000026c266fc, nilfs_segctor_destroy kthread stopped (sci 0000000000ea9b08)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000694aac4c)sctask 0000000012ac78da, nilfs_segctor_destroy kthread stopped (sci 00000000694aac4c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000040949351)sctask 00000000a59115fd, nilfs_segctor_destroy kthread stopped (sci 0000000040949351)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000020aa063d)sctask 00000000b617a775, nilfs_segctor_destroy kthread stopped (sci 0000000020aa063d)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 000000006c416ffd)sctask 00000000da61bfc3, nilfs_segctor_destroy kthread stopped (sci 000000006c416ffd)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 00000000cb84fb3c)sctask 0000000030bae658, nilfs_segctor_destroy kthread stopped (sci 00000000cb84fb3c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer kthread start to stop (sci 0000000023c9588c)sctask 00000000bfd16b12, nilfs_segctor_destroy kthread stopped (sci 0000000023c9588c)sctask 0000000000000000 thread return 0, nilfs_segctor_destroy NILFS (loop4): disposed unprocessed dirty file(s) when stopping log writer Tested on: commit: b98c94ee 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=1252d3cd980000 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 patch: https://syzkaller.appspot.com/x/patch.diff?x=16fbef34580000