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Message-ID: <68440407.a00a0220.29ac89.0052.GAE@google.com> Date: Sat, 07 Jun 2025 02:19:03 -0700 From: syzbot <syzbot+9a4aec827829942045ff@...kaller.appspotmail.com> To: hdanton@...a.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [usb?] stack segment fault in __usb_hcd_giveback_urb Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: stack segment fault in __usb_hcd_giveback_urb Oops: stack segment: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 5953 Comm: kworker/0:3 Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad-dirty #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: usb_hub_wq hub_event RIP: 0010:__queue_work+0x9e/0xfe0 kernel/workqueue.c:2256 Code: 8b 1d fe 53 12 11 31 ff 89 de e8 5d 97 35 00 85 db 0f 85 fc 0c 00 00 e8 10 93 35 00 49 8d 97 c0 01 00 00 48 89 d5 48 c1 ed 03 <42> 0f b6 44 25 00 84 c0 48 89 54 24 08 0f 85 44 0d 00 00 8b 1a 89 RSP: 0018:ffffc90000007708 EFLAGS: 00010002 RAX: ffffffff818ac910 RBX: 0000000000000000 RCX: ffff88802f028000 RDX: 00000000000001c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000038 R08: ffff88807cca3bf7 R09: 1ffff1100f99477e R10: dffffc0000000000 R11: ffffed100f99477f R12: dffffc0000000000 R13: ffff88807cca3bf0 R14: 0000000000000008 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125c52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2c1ba76e90 CR3: 000000007655c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> queue_work_on+0x181/0x270 kernel/workqueue.c:2392 __usb_hcd_giveback_urb+0x41a/0x690 drivers/usb/core/hcd.c:1650 dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x37/0x90 kernel/kcov.c:314 Code: 08 e0 9c 92 65 8b 0d b8 7f dc 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 3c 16 00 00 00 74 52 8b 8a 18 16 00 00 <83> f9 03 75 47 48 8b 8a 20 16 00 00 44 8b 8a 1c 16 00 00 49 c1 e1 RSP: 0018:ffffc90003fdf4d0 EFLAGS: 00000246 RAX: ffffffff825d79a5 RBX: ffffffff825d787c RCX: 0000000000000000 RDX: ffff88802f028000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff825d787c R10: dffffc0000000000 R11: ffffed100e5500d3 R12: dffffc0000000000 R13: 0000000000000001 R14: ffff88801b2ff000 R15: ffff88802fa68e10 rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] kernfs_root+0x145/0x230 fs/kernfs/kernfs-internal.h:80 kernfs_put+0x57/0x480 fs/kernfs/dir.c:571 device_del+0x251/0x8e0 drivers/base/core.c:3856 device_unregister+0x20/0xc0 drivers/base/core.c:3922 usb_remove_ep_devs+0x50/0x80 drivers/usb/core/endpoint.c:189 remove_intf_ep_devs drivers/usb/core/message.c:1266 [inline] usb_disable_device+0x36b/0x8a0 drivers/usb/core/message.c:1417 usb_disconnect+0x304/0x8f0 drivers/usb/core/hub.c:2314 hub_port_connect drivers/usb/core/hub.c:5373 [inline] hub_port_connect_change drivers/usb/core/hub.c:5673 [inline] port_event drivers/usb/core/hub.c:5833 [inline] hub_event+0x1cdb/0x4a00 drivers/usb/core/hub.c:5915 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__queue_work+0x9e/0xfe0 kernel/workqueue.c:2256 Code: 8b 1d fe 53 12 11 31 ff 89 de e8 5d 97 35 00 85 db 0f 85 fc 0c 00 00 e8 10 93 35 00 49 8d 97 c0 01 00 00 48 89 d5 48 c1 ed 03 <42> 0f b6 44 25 00 84 c0 48 89 54 24 08 0f 85 44 0d 00 00 8b 1a 89 RSP: 0018:ffffc90000007708 EFLAGS: 00010002 RAX: ffffffff818ac910 RBX: 0000000000000000 RCX: ffff88802f028000 RDX: 00000000000001c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000038 R08: ffff88807cca3bf7 R09: 1ffff1100f99477e R10: dffffc0000000000 R11: ffffed100f99477f R12: dffffc0000000000 R13: ffff88807cca3bf0 R14: 0000000000000008 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125c52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2c1ba76e90 CR3: 000000007655c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 1d fe 53 12 11 mov 0x111253fe(%rip),%ebx # 0x11125404 6: 31 ff xor %edi,%edi 8: 89 de mov %ebx,%esi a: e8 5d 97 35 00 call 0x35976c f: 85 db test %ebx,%ebx 11: 0f 85 fc 0c 00 00 jne 0xd13 17: e8 10 93 35 00 call 0x35932c 1c: 49 8d 97 c0 01 00 00 lea 0x1c0(%r15),%rdx 23: 48 89 d5 mov %rdx,%rbp 26: 48 c1 ed 03 shr $0x3,%rbp * 2a: 42 0f b6 44 25 00 movzbl 0x0(%rbp,%r12,1),%eax <-- trapping instruction 30: 84 c0 test %al,%al 32: 48 89 54 24 08 mov %rdx,0x8(%rsp) 37: 0f 85 44 0d 00 00 jne 0xd81 3d: 8b 1a mov (%rdx),%ebx 3f: 89 .byte 0x89 Tested on: commit: bdc7f8c5 Merge tag 'mm-stable-2025-06-06-16-09' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1052e20c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fd0cea6d0f67318f dashboard link: https://syzkaller.appspot.com/bug?extid=9a4aec827829942045ff compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 patch: https://syzkaller.appspot.com/x/patch.diff?x=155f5570580000
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