Messages in this thread | | | Date | Fri, 12 Oct 2018 10:32:27 -0400 | From | Dave Jones <> | Subject | Re: netconsole warning in 4.19.0-rc7 |
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On Wed, Oct 10, 2018 at 10:34:49PM -0700, Cong Wang wrote: > (Cc'ing Dave) > > On Wed, Oct 10, 2018 at 5:14 AM Meelis Roos <mroos@linux.ee> wrote: > > > > Thies 4.19-rc7 on a bunch of test machines and got this warning from one. > > It is reproducible and I have not noticed it before. > > > [...] > > [ 9.914805] WARNING: CPU: 0 PID: 0 at kernel/softirq.c:168 __local_bh_enable_ip+0x2e/0x44 > > [ 9.914806] Modules linked in: > > [ 9.914808] CPU: 0 PID: 0 Comm: swapper Not tainted 4.19.0-rc7 #210 > > [ 9.914810] Hardware name: MicroLink /D850MV , BIOS MV85010A.86A.0067.P24.0304081124 04/08/2003 > > [ 9.914811] EIP: __local_bh_enable_ip+0x2e/0x44 > > [ 9.914813] Code: cc 02 5f c8 a9 00 00 0f 00 75 1f 83 ea 01 f7 da 01 15 cc 02 5f c8 a1 cc 02 5f c8 a9 00 ff 1f 00 74 0c ff 0d cc 02 5f c8 5d c3 <0f> 0b eb dd 66 a1 80 cd 5e c8 66 85 c0 74 e9 e8 87 ff ff ff eb e2 > > [ 9.914814] EAX: 80010200 EBX: f602b000 ECX: 36346270 EDX: 00000200 > > [ 9.914815] ESI: f620ecc0 EDI: f620ebac EBP: f600de40 ESP: f600de40 > > [ 9.914816] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 EFLAGS: 00010006 > > [ 9.914817] CR0: 80050033 CR2: b7f5f000 CR3: 36389000 CR4: 000006d0 > > [ 9.914818] Call Trace: > > [ 9.914819] <IRQ> > > [ 9.914820] netpoll_send_skb_on_dev+0xa5/0x1b0 > > This is exactly what I mentioned in my review here: > https://marc.info/?l=linux-netdev&m=153816136624679&w=2 > > "But irq is disabled here, so not sure if rcu_read_lock_bh() > could cause trouble... "
ugh, what a mess. I'm travelling right now so not going to get to look into this more for a week or so. Unless someone has a quick-fix, should we revert ? We've traded one warning for another, which doesn't really feel like progress.
Dave
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