[syzbot] [usb?] BUG: sleeping function called from invalid context in usb_tx_block

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 8bf22c33e7a1 Merge tag 'net-7.0-rc1' of git://git.kernel.o..
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=127b9722580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1ff39736314a9939
dashboard link: https://syzkaller.appspot.com/bug?extid=74afbb6355826ffc2239
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=1561fffa580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1031795a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0e19c10e1a0e/disk-8bf22c33.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8f3209ea7fd5/vmlinux-8bf22c33.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9be7f93d0a22/bzImage-8bf22c33.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+74afbb...@syzkaller.appspotmail.com

usb8xxx: URB in failure status: -2
BUG: sleeping function called from invalid context at drivers/usb/core/urb.c:706
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1
preempt_count: 101, expected: 0
RCU nest depth: 0, expected: 0
no locks held by swapper/1/0.
irq event stamp: 328389
hardirqs last enabled at (328388): [<ffffffff876b10b2>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last enabled at (328388): [<ffffffff876b10b2>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (328389): [<ffffffff876b0dc2>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (328389): [<ffffffff876b0dc2>] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162
softirqs last enabled at (328372): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last enabled at (328372): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last enabled at (328372): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
softirqs last disabled at (328385): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (328385): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (328385): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
__might_resched.cold+0x1ec/0x232 kernel/sched/core.c:8884
usb_kill_urb+0x8e/0x320 drivers/usb/core/urb.c:706
usb_tx_block+0x91/0x320 drivers/net/wireless/marvell/libertas/if_usb.c:429
if_usb_send_fw_pkt.isra.0+0x2e4/0x550 drivers/net/wireless/marvell/libertas/if_usb.c:366
if_usb_receive_fwload+0x5d3/0x780 drivers/net/wireless/marvell/libertas/if_usb.c:592
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866
handle_softirqs+0x1de/0x9d0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: be b1 01 e9 13 e8 02 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 f1 1d 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc9000013fe00 EFLAGS: 00000242
RAX: 00000000000502bf RBX: ffff8881022a1d00 RCX: ffffffff876888d5
RDX: 0000000000000000 RSI: ffffffff8901d71b RDI: ffffffff87afa420
RBP: 0000000000000001 R08: 0000000000000001 R09: ffffed103eae6725
R10: ffff8881f573392b R11: 0000000000000000 R12: ffffed10204543a0
R13: 0000000000000001 R14: ffffffff8aefe2d0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x35b/0x4b0 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148
</TASK>
BUG: scheduling while atomic: swapper/1/0/0x00000102
no locks held by swapper/1/0.
Modules linked in:
irq event stamp: 328389
hardirqs last enabled at (328388): [<ffffffff876b10b2>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last enabled at (328388): [<ffffffff876b10b2>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (328389): [<ffffffff876b0dc2>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (328389): [<ffffffff876b0dc2>] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162
softirqs last enabled at (328372): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last enabled at (328372): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last enabled at (328372): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
softirqs last disabled at (328385): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (328385): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (328385): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
Preemption disabled at:
[<0000000000000000>] 0x0
----------------
Code disassembly (best guess):
0: be b1 01 e9 13 mov $0x13e901b1,%esi
5: e8 02 00 0f 1f call 0x1f0f000c
a: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax)
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: f3 0f 1e fa endbr64
1f: 66 90 xchg %ax,%ax
21: 0f 00 2d d3 f1 1d 00 verw 0x1df1d3(%rip) # 0x1df1fb
28: fb sti
29: f4 hlt
* 2a: c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
36: 00 00 00
39: 66 90 xchg %ax,%ax
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop


---
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[Hillf Danton]

> Date: Tue, 24 Feb 2026 10:56:23 -0800 [thread overview]

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 8bf22c33e7a1 Merge tag 'net-7.0-rc1' of git://git.kernel.o..
> 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=127b9722580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=1ff39736314a9939
> dashboard link: https://syzkaller.appspot.com/bug?extid=74afbb6355826ffc2239
> 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=1561fffa580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1031795a580000

#syz test

--- x/drivers/net/wireless/marvell/libertas/if_usb.h
+++ y/drivers/net/wireless/marvell/libertas/if_usb.h
@@ -44,7 +44,7 @@ struct bootcmdresp
/* USB card description structure*/
struct if_usb_card {
struct usb_device *udev;
- uint32_t model; /* MODEL_* */
+ uint32_t tx_in_flight, model; /* MODEL_* */
struct urb *rx_urb, *tx_urb;
struct lbs_private *priv;

--- x/drivers/net/wireless/marvell/libertas/if_usb.c
+++ y/drivers/net/wireless/marvell/libertas/if_usb.c
@@ -86,6 +86,7 @@ static void if_usb_write_bulk_callback(s
{
struct if_usb_card *cardp = (struct if_usb_card *) urb->context;

+ cardp->tx_in_flight--;
/* handle the transmission complete validations */

if (urb->status == 0) {
@@ -425,8 +426,11 @@ static int usb_tx_block(struct if_usb_ca
ret = -ENODEV;
goto tx_ret;
}
-
- usb_kill_urb(cardp->tx_urb);
+ if (cardp->tx_in_flight++) {
+ cardp->tx_in_flight--;
+ ret = -EBUSY;
+ goto tx_ret;
+ }

usb_fill_bulk_urb(cardp->tx_urb, cardp->udev,
usb_sndbulkpipe(cardp->udev,
@@ -436,6 +440,7 @@ static int usb_tx_block(struct if_usb_ca
cardp->tx_urb->transfer_flags |= URB_ZERO_PACKET;

if ((ret = usb_submit_urb(cardp->tx_urb, GFP_ATOMIC))) {
+ cardp->tx_in_flight--;
lbs_deb_usbd(&cardp->udev->dev, "usb_submit_urb failed: %d\n", ret);
} else {
lbs_deb_usb2(&cardp->udev->dev, "usb_submit_urb success\n");
--

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+74afbb...@syzkaller.appspotmail.com
Tested-by: syzbot+74afbb...@syzkaller.appspotmail.com

Tested on:

commit: 6de23f81 Linux 7.0-rc1

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=163861aa580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f1500201919951cc

dashboard link: https://syzkaller.appspot.com/bug?extid=74afbb6355826ffc2239
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=137c7c4a580000

Note: testing is done by a robot and is best-effort only.