* [syzbot] [net?] [usb?] BUG: using smp_processor_id() in preemptible code in tx_complete
@ 2026-08-01 0:02 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-08-01 0:02 UTC (permalink / raw)
To: andrew+netdev, davem, edumazet, kuba, linux-kernel, linux-usb,
netdev, oneukum, pabeni, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 11028ab62899 Merge tag 'probes-fixes-v7.2-rc5' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10cbd632580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=04cd90bb99c6ef81a65d
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-11028ab6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e2be78614a29/vmlinux-11028ab6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/301a11d315af/bzImage-11028ab6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+04cd90bb99c6ef81a65d@syzkaller.appspotmail.com
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 0 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 3 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 1 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
check_preemption_disabled: 7 callbacks suppressed
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 0 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 1 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 1 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 3 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6205
caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
CPU: 3 UID: 0 PID: 6205 Comm: vhci_rx Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47
tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline]
vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---
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2026-08-01 0:02 [syzbot] [net?] [usb?] BUG: using smp_processor_id() in preemptible code in tx_complete syzbot
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