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AKwUvBwy+DnhKmvfKnsBMN0FtRmRagzlKKk4zb6NhKbHeqC4aGO8d3+4+VBB1gtjKG2C8e0zrG5ug08fk7rhgSQ=@vger.kernel.org X-Gm-Message-State: AFuF++n5oL89F3a8Vvly8oFi3pQCjTTJEGL9kjUywl/clfQQ1l4f3jWH vQUpeT0KEIerah9l0hZ7n967z41hOIOGE6oM/3aqS2I/ICBQ0ZMXb4VbHnof3H2pD2/rUFqHycy LYQ0cXCGDmh/wukSmwsLaLUybj7N+udUAHRpq4sjaLWWj83Kqy/TJQy2OdDw= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:7084:20b0:6be:7782:5a51 with SMTP id 006d021491bc7-6c0ba8280afmr1637387eaf.10.1789090589215; Thu, 10 Sep 2026 18:36:29 -0700 (PDT) Date: Thu, 10 Sep 2026 18:36:29 -0700 In-Reply-To: <6a8cf1e8.dbb3a75c.7844.001a.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa35b1d.6e6c5f9e.28f11f.003c.GAE@google.com> Subject: Re: [syzbot] [mmc?] WARNING: ODEBUG bug in vub300_disconnect From: syzbot To: cjb@laptop.org, dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, johan@kernel.org, lgs201920130244@gmail.com, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, rafael@kernel.org, runyu.xiao@seu.edu.cn, syzkaller-bugs@googlegroups.com, tony.olech@elandigitalsystems.com, ulf.hansson@linaro.org, ulfh@kernel.org, yogeshgaur.83@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=142f5615580000 kernel config: https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9 dashboard link: https://syzkaller.appspot.com/bug?extid=f4a0159ce6802a0a4774 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122f5615580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-50d05c7c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/303a0ade8f9e/vmlinux-50d05c7c.xz kernel image: https://storage.googleapis.com/syzbot-assets/70b8ca71442b/bzImage-50d05c7c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f4a0159ce6802a0a4774@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff888014529270 object type: timer_list hint: vub300_inactivity_timer_expired+0x0/0x550 drivers/mmc/host/vub300.c:1447 WARNING: lib/debugobjects.c:629 at debug_print_object+0x198/0x2b0 lib/debugobjects.c:629, CPU#1: kworker/1:4/6022 Modules linked in: CPU: 1 UID: 0 PID: 6022 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: usb_hub_wq hub_event RIP: 0010:debug_print_object+0x1a5/0x2b0 lib/debugobjects.c:629 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 88 ce 1d 0c 41 56 48 8b 14 ed 40 3e 62 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 e2 00 13 0c 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0000:ffffc900039d73c8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffc900039d74b0 RCX: 0000000000000000 RDX: ffffffff8c623d80 RSI: ffffffff8c623920 RDI: ffffffff91505580 RBP: 0000000000000003 R08: ffff888014529270 R09: ffffffff8bf31160 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c623920 R13: ffffffff8bf311a0 R14: ffffffff88c79960 R15: ffffc900039d74c8 FS: 0000000000000000(0000) GS:ffff888096a60000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000361bf60 CR3: 000000004fa35000 CR4: 0000000000352ef0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1171 [inline] debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1201 slab_free_hook mm/slub.c:2679 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x3d6/0x6d0 mm/slub.c:6792 device_release+0xd2/0x270 drivers/base/core.c:2640 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3884 vub300_delete drivers/mmc/host/vub300.c:379 [inline] kref_put.constprop.0.isra.0+0x159/0x1d0 include/linux/kref.h:65 vub300_disconnect+0x136/0x170 drivers/mmc/host/vub300.c:2388 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:461 device_remove drivers/base/dd.c:618 [inline] device_remove+0x12a/0x180 drivers/base/dd.c:610 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664 device_del+0x376/0x9b0 drivers/base/core.c:3965 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2350 hub_port_connect drivers/usb/core/hub.c:5420 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x1bb1/0x4420 drivers/usb/core/hub.c:5966 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff lcall (bad) 8: df 48 89 fisttps -0x77(%rax) b: fa cli c: 48 c1 ea 03 shr $0x3,%rdx 10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 14: 75 4f jne 0x65 16: 48 8d 3d 88 ce 1d 0c lea 0xc1dce88(%rip),%rdi # 0xc1dcea5 1d: 41 56 push %r14 1f: 48 8b 14 ed 40 3e 62 mov -0x739dc1c0(,%rbp,8),%rdx 26: 8c 27: 4c 89 e6 mov %r12,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 58 pop %rax 30: 83 05 e2 00 13 0c 01 addl $0x1,0xc1300e2(%rip) # 0xc130119 37: 48 83 c4 18 add $0x18,%rsp 3b: 5b pop %rbx 3c: 5d pop %rbp 3d: 41 5c pop %r12 3f: 41 rex.B --- 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.