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elder@kernel.org, gregkh@linuxfoundation.org, greybus-dev@lists.linaro.org, johan@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 893584e7e390 Merge tag 'usb-serial-7.4-rc1' of ssh://gitol.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=15d65da9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7f0127eb11110629 dashboard link: https://syzkaller.appspot.com/bug?extid=61464b62b688791cc24c compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d7c621580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12828121580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7fc735ea948d/disk-893584e7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/546995671e2c/vmlinux-893584e7.xz kernel image: https://storage.googleapis.com/syzbot-assets/54ff06887775/bzImage-893584e7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61464b62b688791cc24c@syzkaller.appspotmail.com greybus greybus1: 0/0:0: synchronous operation id 0x0003 of type 0x14 failed: -71 ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff88811ce2bad8 object type: timer_list hint: gb_operation_timeout+0x0/0xe0 drivers/greybus/operation.c:1211 WARNING: lib/debugobjects.c:629 at debug_print_object+0x198/0x2b0 lib/debugobjects.c:629, CPU#1: kworker/u8:1/33 Modules linked in: CPU: 1 UID: 0 PID: 33 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Workqueue: greybus1:0 gb_operation_work 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 f8 be 37 08 41 56 48 8b 14 ed 40 cf d2 87 4c 89 e6 <67> 48 0f b9 3a 58 83 05 d2 16 33 08 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0018:ffffc90000237868 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffc90000237950 RCX: 0000000000000000 RDX: ffffffff87d2ce80 RSI: ffffffff87d2ca20 RDI: ffffffff8b1aa8a0 RBP: 0000000000000003 R08: ffff88811ce2bad8 R09: ffffffff87ad4ea0 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff87d2ca20 R13: ffffffff87ad4ee0 R14: ffffffff861dd740 R15: ffffc90000237968 FS: 0000000000000000(0000) GS:ffff8882684d7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f27a5b70220 CR3: 00000001176ce000 CR4: 00000000003506f0 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:6509 [inline] kmem_cache_free+0x398/0x650 mm/slub.c:6636 _gb_operation_destroy drivers/greybus/operation.c:682 [inline] kref_put include/linux/kref.h:65 [inline] gb_operation_put+0x1b2/0x3c0 drivers/greybus/operation.c:694 gb_operation_sync_timeout+0x193/0x220 drivers/greybus/operation.c:1172 gb_operation_sync include/linux/greybus/operation.h:203 [inline] gb_svc_pwrmon_rail_count_get drivers/greybus/svc.c:137 [inline] gb_svc_pwrmon_debugfs_init drivers/greybus/svc.c:772 [inline] gb_svc_debugfs_init drivers/greybus/svc.c:827 [inline] gb_svc_hello drivers/greybus/svc.c:875 [inline] gb_svc_request_handler+0x515/0x1250 drivers/greybus/svc.c:1276 gb_operation_request_handle drivers/greybus/operation.c:243 [inline] gb_operation_work+0xb7/0x990 drivers/greybus/operation.c:280 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+0x69f/0xc90 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 f8 be 37 08 lea 0x837bef8(%rip),%rdi # 0x837bf15 1d: 41 56 push %r14 1f: 48 8b 14 ed 40 cf d2 mov -0x782d30c0(,%rbp,8),%rdx 26: 87 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 d2 16 33 08 01 addl $0x1,0x83316d2(%rip) # 0x8331709 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 --- 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