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2002:a05:6808:13c4:b0:492:c9a4:2104 with SMTP id 5614622812f47-4b35047d310mr8516018b6e.10.1787711102704; Tue, 25 Aug 2026 19:25:02 -0700 (PDT) Date: Tue, 25 Aug 2026 19:25:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8e4e7e.a5a502ce.31d34.012b.GAE@google.com> Subject: Re: [syzbot] [kernel?] WARNING: kobject bug in goku_remove From: syzbot To: chenglingfei@foxmail.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: proc registration bug in goku_probe goku_udc 0000:00:1d.7: version: 30-Oct 2003 (dma IN) goku_udc 0000:00:1d.7: irq 19, pci mem ffffc9000363f000 ------------[ cut here ]------------ proc_dir_entry 'driver/udc' already registered WARNING: fs/proc/generic.c:404 at proc_register+0x5db/0x910 fs/proc/generic.c:404, CPU#2: syz-executor259/6021 Modules linked in: CPU: 2 UID: 0 PID: 6021 Comm: syz-executor259 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 RIP: 0010:proc_register+0x5e7/0x910 fs/proc/generic.c:404 Code: 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 50 02 00 00 48 8d 3d 25 49 6b 0e 48 8b 44 24 10 48 8b b0 d0 00 00 00 <67> 48 0f b9 3a 48 c7 c7 00 78 ea 8e e8 98 0a 01 09 48 8b 4c 24 30 RSP: 0018:ffffc90003087698 EFLAGS: 00010246 RAX: ffff88801daebb80 RBX: 0000000000000000 RCX: 1ffff11003b5d78a RDX: ffff88803e408e9c RSI: ffff88801daebc5c RDI: ffffffff91281ed0 RBP: ffff88801daebc30 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803e408dc0 R13: dffffc0000000000 R14: ffff88803e409af8 R15: ffffed1007c811d3 FS: 0000555580895400(0000) GS:ffff8880d5fe9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f40537909c0 CR3: 00000000567ce000 CR4: 0000000000352ef0 Call Trace: proc_create_single_data+0xd9/0x130 fs/proc/generic.c:681 goku_probe.cold+0x328/0x524 drivers/usb/gadget/udc/goku_udc.c:1822 local_pci_probe+0xdd/0x1b0 drivers/pci/pci-driver.c:332 pci_call_probe+0x176/0x800 drivers/pci/pci-driver.c:394 __pci_device_probe drivers/pci/pci-driver.c:455 [inline] pci_device_probe+0x1cd/0x370 drivers/pci/pci-driver.c:489 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 pci_add_dynid+0x2b5/0x370 drivers/pci/pci-driver.c:77 new_id_store+0x2a9/0x5b0 drivers/pci/pci-driver.c:249 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7eff25b5de37 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fff3195caa0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000555580895400 RCX: 00007eff25b5de37 RDX: 000000000000000d RSI: 00007fff3195cb60 RDI: 0000000000000003 RBP: 00007fff3195d7e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 00007fff3195ce00 R14: 00007fff3195cbe0 R15: 0000000000000001 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 fc add %bh,%ah 4: ff lcall (bad) 5: df 48 89 fisttps -0x77(%rax) 8: f9 stc 9: 48 c1 e9 03 shr $0x3,%rcx d: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) 11: 0f 85 50 02 00 00 jne 0x267 17: 48 8d 3d 25 49 6b 0e lea 0xe6b4925(%rip),%rdi # 0xe6b4943 1e: 48 8b 44 24 10 mov 0x10(%rsp),%rax 23: 48 8b b0 d0 00 00 00 mov 0xd0(%rax),%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 c7 c7 00 78 ea 8e mov $0xffffffff8eea7800,%rdi 36: e8 98 0a 01 09 call 0x9010ad3 3b: 48 8b 4c 24 30 mov 0x30(%rsp),%rcx Tested on: commit: 3aa1dcaa Revert "wifi: mt76: Disable napi when removin.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=155cf979580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=06ec7624018233e17113 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=12acf979580000