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syzkaller-bugs@googlegroups.com X-Headers-End: 1ww1L2-0005te-0l Subject: [f2fs-dev] [syzbot] [f2fs?] WARNING: suspicious RCU usage in f2fs_remove_ino_entry X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hello, syzbot found the following issue on: HEAD commit: 4477a78374a5 Add linux-next specific files for 20260814 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14e5ea25580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9b32a36dd637b06f dashboard link: https://syzkaller.appspot.com/bug?extid=e1fcebe01f24c6309792 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1320d949580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/994c1c8c560e/disk-4477a783.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cd54543d69ae/vmlinux-4477a783.xz kernel image: https://storage.googleapis.com/syzbot-assets/407cdf8f3fc2/bzImage-4477a783.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/8c65ba7adddd/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16b9fa79580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e1fcebe01f24c6309792@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- ./include/linux/radix-tree.h:179 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 locks held by syz-executor/5756: 2, last CPU#0: #0: ffff888079faa0e8 (&type->s_umount_key#56){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline] #0: ffff888079faa0e8 (&type->s_umount_key#56){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline] #0: ffff888079faa0e8 (&type->s_umount_key#56){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:631 #1: ffff88801cf908c8 (&im->ino_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline] #1: ffff88801cf908c8 (&im->ino_lock){+.+.}-{3:3}, at: __clear_ino_bitmap fs/f2fs/checkpoint.c:809 [inline] #1: ffff88801cf908c8 (&im->ino_lock){+.+.}-{3:3}, at: f2fs_remove_ino_entry+0x18d/0x3f0 fs/f2fs/checkpoint.c:855 stack backtrace: CPU: 0 UID: 0 PID: 5756 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6938 radix_tree_deref_slot include/linux/radix-tree.h:179 [inline] __clear_ino_bitmap fs/f2fs/checkpoint.c:812 [inline] f2fs_remove_ino_entry+0x3ae/0x3f0 fs/f2fs/checkpoint.c:855 f2fs_delete_inode fs/f2fs/inode.c:946 [inline] f2fs_evict_inode+0x83d/0x21f0 fs/f2fs/inode.c:1100 evict+0x624/0xb50 fs/inode.c:822 f2fs_pre_evict_inode fs/f2fs/inode.c:911 [inline] f2fs_evict_inode+0x20f/0x21f0 fs/f2fs/inode.c:1096 evict+0x624/0xb50 fs/inode.c:822 dispose_list fs/inode.c:864 [inline] evict_inodes+0x7e3/0x870 fs/inode.c:918 generic_shutdown_super+0xaa/0x2d0 fs/super.c:755 kill_block_super+0x44/0xa0 fs/super.c:1918 kill_f2fs_super+0x3b3/0x700 fs/f2fs/super.c:5635 deactivate_locked_super+0xbc/0x110 fs/super.c:603 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f896299f317 Code: a2 c7 05 dc 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc3257e798 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f8962a34474 RCX: 00007f896299f317 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc3257e850 RBP: 00007ffc3257e850 R08: 00007ffc3257f850 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc3257f8e0 R13: 00007f8962a34474 R14: 0000000000016591 R15: 00007ffc3257f920 --- 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. 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Mon, 17 Aug 2026 10:41:26 -0700 (PDT) Date: Mon, 17 Aug 2026 10:41:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8347c6.4d75e56a.c9a88.0004.GAE@google.com> Subject: [syzbot] [f2fs?] WARNING: suspicious RCU usage in f2fs_remove_ino_entry From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4477a78374a5 Add linux-next specific files for 20260814 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14e5ea25580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9b32a36dd637b06f dashboard link: https://syzkaller.appspot.com/bug?extid=e1fcebe01f24c6309792 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1320d949580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/994c1c8c560e/disk-4477a783.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cd54543d69ae/vmlinux-4477a783.xz kernel image: https://storage.googleapis.com/syzbot-assets/407cdf8f3fc2/bzImage-4477a783.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/8c65ba7adddd/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=16b9fa79580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e1fcebe01f24c6309792@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- ./include/linux/radix-tree.h:179 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 locks held by syz-executor/5756: 2, last CPU#0: #0: ffff888079faa0e8 (&type->s_umount_key#56){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline] #0: ffff888079faa0e8 (&type->s_umount_key#56){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline] #0: ffff888079faa0e8 (&type->s_umount_key#56){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:631 #1: ffff88801cf908c8 (&im->ino_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline] #1: ffff88801cf908c8 (&im->ino_lock){+.+.}-{3:3}, at: __clear_ino_bitmap fs/f2fs/checkpoint.c:809 [inline] #1: ffff88801cf908c8 (&im->ino_lock){+.+.}-{3:3}, at: f2fs_remove_ino_entry+0x18d/0x3f0 fs/f2fs/checkpoint.c:855 stack backtrace: CPU: 0 UID: 0 PID: 5756 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6938 radix_tree_deref_slot include/linux/radix-tree.h:179 [inline] __clear_ino_bitmap fs/f2fs/checkpoint.c:812 [inline] f2fs_remove_ino_entry+0x3ae/0x3f0 fs/f2fs/checkpoint.c:855 f2fs_delete_inode fs/f2fs/inode.c:946 [inline] f2fs_evict_inode+0x83d/0x21f0 fs/f2fs/inode.c:1100 evict+0x624/0xb50 fs/inode.c:822 f2fs_pre_evict_inode fs/f2fs/inode.c:911 [inline] f2fs_evict_inode+0x20f/0x21f0 fs/f2fs/inode.c:1096 evict+0x624/0xb50 fs/inode.c:822 dispose_list fs/inode.c:864 [inline] evict_inodes+0x7e3/0x870 fs/inode.c:918 generic_shutdown_super+0xaa/0x2d0 fs/super.c:755 kill_block_super+0x44/0xa0 fs/super.c:1918 kill_f2fs_super+0x3b3/0x700 fs/f2fs/super.c:5635 deactivate_locked_super+0xbc/0x110 fs/super.c:603 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f896299f317 Code: a2 c7 05 dc 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc3257e798 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f8962a34474 RCX: 00007f896299f317 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc3257e850 RBP: 00007ffc3257e850 R08: 00007ffc3257f850 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc3257f8e0 R13: 00007f8962a34474 R14: 0000000000016591 R15: 00007ffc3257f920 --- 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