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AFNElJ8yzx9tGmHJXszgf5AUV1U1POYYH7MbztQWk2W6m9JXv0apLnK5is86tTmvs7kSR+u3ODZ1Uhp9/tAi@vger.kernel.org X-Gm-Message-State: AOJu0Yyl1Fhu+mviUg+B8Nn5x6UIFcPbo5ab6H+cHMmlIYy4uxpwNqAT 7fWgR+49QE4y8YmLe+gl59l50vR9iwXu4e5z/MKt0Ky1gazUGWyi8olsfg46eyNK3EmQ8E0Z7Tq 9znyQYffo6wIO9js3i5MGJ3muuBjTlCu5SHnQWGS0kvzFJyHCNtBGyJSJ6mg= Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:c1f7:b0:489:443d:a8ed with SMTP id 5614622812f47-4896ac4a91amr16299113b6e.32.1782220398523; Tue, 23 Jun 2026 06:13:18 -0700 (PDT) Date: Tue, 23 Jun 2026 06:13:18 -0700 In-Reply-To: <20260623083540.2744885-1-yun.zhou@windriver.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a3a866e.c358b6d0.89040.0003.GAE@google.com> Subject: [syzbot ci] Re: ext4: deferred iput framework for EA inodes From: syzbot ci To: adilger.kernel@dilger.ca, jack@suse.cz, libaokun@linux.alibaba.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, ojaswin@linux.ibm.com, ritesh.list@gmail.com, tytso@mit.edu, yi.zhang@huawei.com, yun.zhou@windriver.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v9] ext4: deferred iput framework for EA inodes https://lore.kernel.org/all/20260623083540.2744885-1-yun.zhou@windriver.com * [PATCH v9 1/4] fs: add iput_if_not_last() helper * [PATCH v9 2/4] ext4: introduce ext4_put_ea_inode() for safe deferred iput * [PATCH v9 3/4] ext4: convert all EA inode iput() calls to ext4_put_ea_inode() * [PATCH v9 4/4] ext4: remove ea_inode_array mechanism in favor of ext4_put_ea_inode() and found the following issue: WARNING: ODEBUG bug in flush_delayed_work Full report is available here: https://ci.syzbot.org/series/acc1a7bd-816f-451e-86ee-a62f88ad8fcc *** WARNING: ODEBUG bug in flush_delayed_work tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 502d801f0ab03e4f32f9a33d203154ce84887921 arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/79d2cdf0-fde6-4e70-a88c-04d44c9d3e44/config syz repro: https://ci.syzbot.org/findings/9b2e3f5d-279a-469f-9f2a-05f96ea11587/syz_repro EXT4-fs warning (device loop2): ext4_multi_mount_protect:287: Invalid MMP block in superblock ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: ffff8881bf08c9e0 object type: timer_list hint: 0x0 WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#1: syz.2.19/5833 Modules linked in: CPU: 1 UID: 0 PID: 5833 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629 Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 5d 04 71 fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 a3 23 70 0b 48 83 c4 10 5b 41 5c RSP: 0018:ffffc9000179f848 EFLAGS: 00010046 RAX: 1ffffffff179eacc RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffffffff8c2a9980 RSI: ffffffff8c2a93e0 RDI: ffffffff903ddbf0 RBP: ffffffff8c2a9980 R08: ffff8881bf08c9e0 R09: ffffffff8bcf69c0 R10: dffffc0000000000 R11: ffffffff81b25990 R12: 0000000000000000 R13: ffffffff903ddbf0 R14: ffff8881bf08c9e0 R15: ffffffff8bcf5660 FS: 00007fd11e12e6c0(0000) GS:ffff8882a922d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe46d80f88 CR3: 00000001bf40e000 CR4: 00000000000006f0 Call Trace: debug_object_assert_init+0x237/0x370 lib/debugobjects.c:1075 debug_timer_assert_init kernel/time/timer.c:803 [inline] debug_assert_init kernel/time/timer.c:848 [inline] __try_to_del_timer_sync kernel/time/timer.c:1457 [inline] __timer_delete_sync+0x181/0x520 kernel/time/timer.c:1621 flush_delayed_work+0x48/0x100 kernel/workqueue.c:4414 ext4_drain_ea_inode_work fs/ext4/xattr.h:196 [inline] __ext4_fill_super fs/ext4/super.c:5795 [inline] ext4_fill_super+0x54c7/0x66d0 fs/ext4/super.c:5844 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1634 vfs_get_tree+0x92/0x2a0 fs/super.c:1694 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3765 [inline] do_new_mount+0x319/0xdc0 fs/namespace.c:3841 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd11d19e0ca Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd11e12de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd11e12dee0 RCX: 00007fd11d19e0ca RDX: 0000200000000400 RSI: 0000200000000340 RDI: 00007fd11e12dea0 RBP: 0000200000000400 R08: 00007fd11e12dee0 R09: 000000000021c91c R10: 000000000021c91c R11: 0000000000000246 R12: 0000200000000340 R13: 00007fd11e12dea0 R14: 000000000000051a R15: 0000200000000240 ---------------- Code disassembly (best guess): 0: f8 clc 1: 48 c1 e8 03 shr $0x3,%rax 5: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 9: 74 08 je 0x13 b: 4c 89 ff mov %r15,%rdi e: e8 5d 04 71 fd call 0xfd710470 13: 4d 8b 0f mov (%r15),%r9 16: 4c 89 ef mov %r13,%rdi 19: 48 8b 74 24 08 mov 0x8(%rsp),%rsi 1e: 48 89 ea mov %rbp,%rdx 21: 44 89 e1 mov %r12d,%ecx 24: 4d 89 f0 mov %r14,%r8 27: ff 34 24 push (%rsp) * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: ff 05 a3 23 70 0b incl 0xb7023a3(%rip) # 0xb7023dc 39: 48 83 c4 10 add $0x10,%rsp 3d: 5b pop %rbx 3e: 41 5c pop %r12 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.