[syzbot] [usb?] WARNING in kcov_remote_start (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 771ed66105de Merge tag 'clk-fixes-for-linus' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16c06364980000
kernel config: https://syzkaller.appspot.com/x/.config?x=333ebe38d43c42e2
dashboard link: https://syzkaller.appspot.com/bug?extid=7110e6a4069f19537d85
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9ca3dd648520/disk-771ed661.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/54c60e26a55f/vmlinux-771ed661.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b8ec7b1012cf/bzImage-771ed661.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7110e6...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 24 at kernel/kcov.c:870 kcov_remote_start+0x5a2/0x7e0 kernel/kcov.c:870
Modules linked in:
CPU: 1 PID: 24 Comm: ksoftirqd/1 Not tainted 6.10.0-rc2-syzkaller-00366-g771ed66105de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:kcov_remote_start+0x5a2/0x7e0 kernel/kcov.c:870
Code: 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 0f 85 a6 01 00 00 41 f7 c6 00 02 00 00 0f 84 93 fa ff ff fb e9 8d fa ff ff 90 <0f> 0b 90 e8 86 6f f0 09 89 c0 48 c7 c7 c8 d4 02 00 48 03 3c c5 e0
RSP: 0018:ffffc90000a189c0 EFLAGS: 00010002
RAX: 0000000080010100 RBX: ffff888017af0000 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: ffffffff8bcacd00 RDI: ffffffff8c1ff280
RBP: 0100000000000003 R08: ffffffff92fab5f7 R09: 1ffffffff25f56be
R10: dffffc0000000000 R11: fffffbfff25f56bf R12: ffffffff819630ae
R13: 00000000ffffffb9 R14: 0000000000000006 R15: ffff8880b952d4c8
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33527000 CR3: 00000000674b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
kcov_remote_start_usb include/linux/kcov.h:53 [inline]
kcov_remote_start_usb_softirq include/linux/kcov.h:66 [inline]
__usb_hcd_giveback_urb+0x34a/0x530 drivers/usb/core/hcd.c:1647
dummy_timer+0x830/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1987
__run_hrtimer kernel/time/hrtimer.c:1687 [inline]
__hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1751
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1813
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
__sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:kcov_remote_start+0x2e/0x7e0 kernel/kcov.c:924
Code: 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 65 48 8b 1c 25 00 d5 03 00 48 b8 00 00 00 00 ff ff ff 00 48 85 c7 74 17 90 0f 0b 90 <48> 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 48 89 fd
RSP: 0018:ffffc900001e7840 EFLAGS: 00000206
RAX: 5308892166c1b700 RBX: ffff888017af0000 RCX: ffffffff8172d80a
RDX: dffffc0000000000 RSI: ffffffff8bcabb80 RDI: ffffffff8c1ff280
RBP: ffff8880b952d4c8 R08: ffffffff92fab5f7 R09: 1ffffffff25f56be
R10: dffffc0000000000 R11: fffffbfff25f56bf R12: 0000000000040000
R13: 0000000000000000 R14: 0000000000000206 R15: ffff88801c71e700
kcov_remote_start_usb include/linux/kcov.h:53 [inline]
kcov_remote_start_usb_softirq include/linux/kcov.h:66 [inline]
__usb_hcd_giveback_urb+0x34a/0x530 drivers/usb/core/hcd.c:1647
usb_giveback_urb_bh+0x306/0x4e0 drivers/usb/core/hcd.c:1682
process_one_work kernel/workqueue.c:3231 [inline]
process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
bh_worker+0x2a5/0x620 kernel/workqueue.c:3572
tasklet_hi_action+0xf/0x90 kernel/softirq.c:816
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
run_ksoftirqd+0xca/0x130 kernel/softirq.c:928
smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
----------------
Code disassembly (best guess):
0: 55 push %rbp
1: 41 57 push %r15
3: 41 56 push %r14
5: 41 55 push %r13
7: 41 54 push %r12
9: 53 push %rbx
a: 48 83 ec 18 sub $0x18,%rsp
e: 65 48 8b 1c 25 00 d5 mov %gs:0x3d500,%rbx
15: 03 00
17: 48 b8 00 00 00 00 ff movabs $0xffffff00000000,%rax
1e: ff ff 00
21: 48 85 c7 test %rax,%rdi
24: 74 17 je 0x3d
26: 90 nop
27: 0f 0b ud2
29: 90 nop
* 2a: 48 83 c4 18 add $0x18,%rsp <-- trapping instruction
2e: 5b pop %rbx
2f: 41 5c pop %r12
31: 41 5d pop %r13
33: 41 5e pop %r14
35: 41 5f pop %r15
37: 5d pop %rbp
38: c3 ret
39: cc int3
3a: cc int3
3b: cc int3
3c: cc int3
3d: 48 89 fd mov %rdi,%rbp


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[Tetsuo Handa]

#syz fix: kcov, usb: disable interrupts in kcov_remote_start_usb_softirq