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cTlWsk_zMzSLSolNuQJUwjs7ABUw23xa Hi Rahul, On 07/01/26 13:48, Rahul Sharma wrote: > From: Zqiang > > Syzbot reported the following warning: > > BUG: using smp_processor_id() in preemptible [00000000] code: dhcpcd/2879 > caller is usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 > CPU: 1 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-00098-g615dca38c2ea #0 PREEMPT(voluntary) > Call Trace: > > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 > check_preemption_disabled+0xd0/0xe0 lib/smp_processor_id.c:49 > usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 > usbnet_resume_rx+0x4b/0x170 drivers/net/usb/usbnet.c:708 > usbnet_change_mtu+0x1be/0x220 drivers/net/usb/usbnet.c:417 > __dev_set_mtu net/core/dev.c:9443 [inline] > netif_set_mtu_ext+0x369/0x5c0 net/core/dev.c:9496 > netif_set_mtu+0xb0/0x160 net/core/dev.c:9520 > dev_set_mtu+0xae/0x170 net/core/dev_api.c:247 > dev_ifsioc+0xa31/0x18d0 net/core/dev_ioctl.c:572 > dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821 > sock_do_ioctl+0x19d/0x280 net/socket.c:1204 > sock_ioctl+0x42f/0x6a0 net/socket.c:1311 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:906 [inline] > __se_sys_ioctl fs/ioctl.c:892 [inline] > __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > For historical and portability reasons, the netif_rx() is usually > run in the softirq or interrupt context, this commit therefore add > local_bh_disable/enable() protection in the usbnet_resume_rx(). > > Fixes: 43daa96b166c ("usbnet: Stop RX Q on MTU change") > Link: https://syzkaller.appspot.com/bug?id=81f55dfa587ee544baaaa5a359a060512228c1e1 > Suggested-by: Jakub Kicinski > Signed-off-by: Zqiang > Link: https://patch.msgid.link/20251011070518.7095-1-qiang.zhang@linux.dev > Signed-off-by: Paolo Abeni > [ The context change is due to the commit 2c04d279e857 > ("net: usb: Convert tasklet API to new bottom half workqueue mechanism") > in v6.17 which is irrelevant to the logic of this patch.] > Signed-off-by: Rahul Sharma > --- Greg already queued this for 6.12.64: https://lore.kernel.org/all/20260106170510.964268694@linuxfoundation.org/ and 6.12.64 is now released. So I think we can skip this patch. Also, if you want to figure this out without searching on lore. You could use stable-queue repo to see if a patch you are trying to backport is already being backported by someone else. stable-queue repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/ Thanks, Harshit