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Message-ID: <6848016e.050a0220.33aa0e.033a.GAE@google.com> Date: Tue, 10 Jun 2025 02:57:02 -0700 From: syzbot <syzbot+9a4aec827829942045ff@...kaller.appspotmail.com> To: dmantipov@...dex.ru, 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: WARNING in carl9170_usb_rx_complete ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6612 at drivers/net/wireless/ath/carl9170/usb.c:448 carl9170_usb_rx_complete+0x28a/0x2d0 drivers/net/wireless/ath/carl9170/usb.c:448 Modules linked in: CPU: 1 UID: 0 PID: 6612 Comm: kworker/1:3 Not tainted 6.16.0-rc1-syzkaller-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:carl9170_usb_rx_complete+0x28a/0x2d0 drivers/net/wireless/ath/carl9170/usb.c:448 Code: 5d e9 2a 04 27 04 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 05 fe ff ff 4c 89 e7 e8 c1 da 62 fb e9 f8 fd ff ff e8 77 63 ff fa 90 <0f> 0b 90 e9 f7 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 4c RSP: 0018:ffffc90000a08868 EFLAGS: 00010046 RAX: ffffffff86c0fb79 RBX: ffff8880775430a0 RCX: ffff88802f255a00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff888077543a6b R09: 1ffff1100eea874d R10: dffffc0000000000 R11: ffffed100eea874e R12: 00000000ffffffb9 R13: dffffc0000000000 R14: ffff88807754358c R15: ffff8880664d9600 FS: 0000000000000000(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff0496217d0 CR3: 0000000078f80000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __usb_hcd_giveback_urb+0x41a/0x690 drivers/usb/core/hcd.c:1650 dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1995 __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:console_flush_all+0x7f7/0xc40 kernel/printk/printk.c:3227 Code: 48 21 c3 0f 85 e9 01 00 00 e8 b5 23 1f 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 a6 23 1f 00 eb 06 e8 9f 23 1f 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 fa 9a 82 00 48 8b 1b 48 8b 44 24 RSP: 0018:ffffc90003e4f0a0 EFLAGS: 00000293 RAX: 1ffffffff1d36a1f RBX: ffffffff8e9b50f8 RCX: ffff88802f255a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003e4f1f0 R08: ffffffff8fa108f7 R09: 1ffffffff1f4211e R10: dffffc0000000000 R11: fffffbfff1f4211f R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8e9b50a0 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4917 dev_printk_emit+0xe0/0x130 drivers/base/core.c:4928 _dev_info+0x10a/0x160 drivers/base/core.c:4986 usb_disconnect+0xdd/0x910 drivers/usb/core/hub.c:2298 hub_port_connect drivers/usb/core/hub.c:5375 [inline] hub_port_connect_change drivers/usb/core/hub.c:5675 [inline] port_event drivers/usb/core/hub.c:5835 [inline] hub_event+0x1cdb/0x4a00 drivers/usb/core/hub.c:5917 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+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> ---------------- Code disassembly (best guess): 0: 48 21 c3 and %rax,%rbx 3: 0f 85 e9 01 00 00 jne 0x1f2 9: e8 b5 23 1f 00 call 0x1f23c3 e: 48 8b 5c 24 20 mov 0x20(%rsp),%rbx 13: 4d 85 f6 test %r14,%r14 16: 75 07 jne 0x1f 18: e8 a6 23 1f 00 call 0x1f23c3 1d: eb 06 jmp 0x25 1f: e8 9f 23 1f 00 call 0x1f23c3 24: fb sti 25: 48 8b 44 24 28 mov 0x28(%rsp),%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 fa 9a 82 00 call 0x829b33 39: 48 8b 1b mov (%rbx),%rbx 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 44 rex.R 3f: 24 .byte 0x24 Tested on: commit: 19272b37 Linux 6.16-rc1 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1489c60c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c07f08ee4bcfb276 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=11aac60c580000
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