https://bugzilla.kernel.org/show_bug.cgi?id=209407 Bug ID: 209407 Summary: skb_over_panic in cdc_mbim_tx_fixup Product: Drivers Version: 2.5 Kernel Version: 5.8.12 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: USB Assignee: drivers_usb@xxxxxxxxxxxxxxxxxxxxxx Reporter: jks@xxxxxx Regression: No Created attachment 292681 --> https://bugzilla.kernel.org/attachment.cgi?id=292681&action=edit Debug information including the dmesg dump I'm running a PCEngines APU3C4 system as a router, with a Huawei 909s-120 LTE module for the upstream connection. It has been crashing once every few days. I found a way to cause the crash (or at least one case of it) quite reliably by transferring a large file from a host to AWS S3 via the router. This happened initially on Debian's kernel 4.19.132-1 but I can reproduce it on an unmodified 5.8.12. The following dumps are all from 5.8.12. Some lines from the dmesg dump (the full dump in the attachment along with other debug information): > [ 2297.135441] skbuff: skb_over_panic: text:ffffffffc09bf27a len:122 put:122 > head:0000000000000000 data:0000000000000000 tail:0x7a end:0x0 dev:<NULL> > [ 2297.137499] BUG: unable to handle page fault for address: ffff90b01631c000 > [ 2297.167354] Call Trace: > [ 2297.167369] <IRQ> > [ 2297.167409] cdc_ncm_fill_tx_frame+0x83a/0x970 [cdc_ncm] > [ 2297.306125] cdc_mbim_tx_fixup+0x1d9/0x240 [cdc_mbim] > [ 2297.311578] usbnet_start_xmit+0x5d/0x720 [usbnet] > [ 2297.316682] dev_hard_start_xmit+0x93/0x1f0 cdc_ncm_fill_tx_frame+0x83a is in cdc_ncm_fill_tx_frame (./include/linux/skbuff.h:2252): > 2246 static inline void *skb_put_zero(struct sk_buff *skb, unsigned int len) > 2247 { > 2248 void *tmp = skb_put(skb, len); > 2249 > 2250 memset(tmp, 0, len); > 2251 > 2252 return tmp; > 2253 } cdc_mbim_tx_fixup+0x1d9 is in cdc_mbim_tx_fixup (drivers/net/usb/cdc_mbim.c:292): > 288 } > 289 } > 290 > 291 spin_lock_bh(&ctx->mtx); > 292 skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign); > 293 spin_unlock_bh(&ctx->mtx); > 294 return skb_out; My corresponding Debian bug report is at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970736 -- You are receiving this mail because: You are watching the assignee of the bug.
