Le jeudi 03 juin 2021 à 10:44 +0800, Xuan Zhuo a écrit : > On Wed, 02 Jun 2021 19:54:41 +0200, Corentin Noël < > corentin.noel@xxxxxxxxxxxxx> wrote: > > Sure, here is the decoded trace: > > > > [ 44.523231] skbuff: skb_over_panic: text:ffffffffad1a8434 > > len:3762 > > put:3762 head:ffff9799e6b6b000 data:ffff9799e6b6b010 tail:0xec2 > > end:0xec0 dev:<NULL> > > [ 44.525254] kernel BUG at net/core/skbuff.c:110! > > [ 44.525910] invalid opcode: 0000 [#1] SMP PTI > > [ 44.526521] CPU: 2 PID: 245 Comm: llvmpipe-0 Not tainted 5.13.0- > > rc4linux-v5.13-rc4-for-mesa-ci-184862285c49.tar.bz2 #1 > > [ 44.528109] Hardware name: ChromiumOS crosvm, BIOS 0 > > [ 44.529243] RIP: 0010:skb_panic (net/core/skbuff.c:110) > > [ 44.530284] Code: 4f 70 50 8b 87 bc 00 00 00 50 8b 87 b8 00 00 00 > > 50 > > ff b7 c8 00 00 00 4c 8b 8f c0 00 00 00 48 c7 c7 f0 af cf ad e8 43 > > 4c fb > > ff <0f> 0b 48 8b 14 24 48 c7 c1 20 23 b1 ad e8 ab ff ff ff 48 c7 c6 > > 60 > > All code > > ======== > > 0: 4f 70 50 rex.WRXB jo 0x53 > > 3: 8b 87 bc 00 00 00 mov 0xbc(%rdi),%eax > > 9: 50 push %rax > > a: 8b 87 b8 00 00 00 mov 0xb8(%rdi),%eax > > 10: 50 push %rax > > 11: ff b7 c8 00 00 00 pushq 0xc8(%rdi) > > 17: 4c 8b 8f c0 00 00 00 mov 0xc0(%rdi),%r9 > > 1e: 48 c7 c7 f0 af cf ad mov $0xffffffffadcfaff0, > > %rdi > > 25: e8 43 4c fb ff callq 0xfffffffffffb4c6d > > 2a:* 0f 0b ud2 <-- > > trapping > > instruction > > 2c: 48 8b 14 24 mov (%rsp),%rdx > > 30: 48 c7 c1 20 23 b1 ad mov $0xffffffffadb12320, > > %rcx > > 37: e8 ab ff ff ff callq 0xffffffffffffffe7 > > 3c: 48 rex.W > > 3d: c7 .byte 0xc7 > > 3e: c6 (bad) > > 3f: 60 (bad) > > > > Code starting with the faulting instruction > > =========================================== > > 0: 0f 0b ud2 > > 2: 48 8b 14 24 mov (%rsp),%rdx > > 6: 48 c7 c1 20 23 b1 ad mov $0xffffffffadb12320, > > %rcx > > d: e8 ab ff ff ff callq 0xffffffffffffffbd > > 12: 48 rex.W > > 13: c7 .byte 0xc7 > > 14: c6 (bad) > > 15: 60 (bad) > > [ 44.533988] RSP: 0000:ffffa651c134fc20 EFLAGS: 00010246 > > [ 44.534723] RAX: 000000000000008b RBX: 0000000000000010 RCX: > > 00000000ffffdfff > > [ 44.535772] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: > > 0000000000000000 > > [ 44.536693] RBP: ffffd77b009adac0 R08: ffffffffadf44b08 R09: > > 0000000000009ffb > > [ 44.537569] R10: 00000000ffffe000 R11: 3fffffffffffffff R12: > > ffff979ad2aa5600 > > [ 44.538449] R13: 0000000000000000 R14: ffff9799e6b6b000 R15: > > 0000000000000eb2 > > [ 44.539300] FS: 00007fdb9cb11700(0000) > > GS:ffff979aebd00000(0000) > > knlGS:0000000000000000 > > [ 44.540376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 44.541103] CR2: 00007f99099f4024 CR3: 0000000129558005 CR4: > > 0000000000370ee0 > > [ 44.542057] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > 0000000000000000 > > [ 44.543063] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: > > 0000000000000400 > > [ 44.544063] Call Trace: > > [ 44.544385] skb_put.cold (net/core/skbuff.c:5254 (discriminator > > 1) > > net/core/skbuff.c:5252 (discriminator 1)) > > [ 44.544864] page_to_skb (drivers/net/virtio_net.c:485) > > [ 44.545361] receive_buf (drivers/net/virtio_net.c:849 > > drivers/net/virtio_net.c:1131) > > [ 44.545870] ? netif_receive_skb_list_internal > > (net/core/dev.c:5714) > > [ 44.546628] ? dev_gro_receive (net/core/dev.c:6103) > > [ 44.547135] ? napi_complete_done (./include/linux/list.h:35 > > net/core/dev.c:5867 net/core/dev.c:5862 net/core/dev.c:6565) > > [ 44.547672] virtnet_poll (drivers/net/virtio_net.c:1427 > > drivers/net/virtio_net.c:1525) > > [ 44.548251] __napi_poll (net/core/dev.c:6985) > > [ 44.548744] net_rx_action (net/core/dev.c:7054 > > net/core/dev.c:7139) > > [ 44.549264] __do_softirq (./arch/x86/include/asm/jump_label.h:19 > > ./include/linux/jump_label.h:200 ./include/trace/events/irq.h:142 > > kernel/softirq.c:560) > > [ 44.549762] irq_exit_rcu (kernel/softirq.c:433 > > kernel/softirq.c:637 > > kernel/softirq.c:649) > > [ 44.551384] common_interrupt (arch/x86/kernel/irq.c:240 > > (discriminator 13)) > > [ 44.551991] ? asm_common_interrupt > > (./arch/x86/include/asm/idtentry.h:638) > > [ 44.552654] asm_common_interrupt > > (./arch/x86/include/asm/idtentry.h:638) > > [ 44.553276] RIP: 0033:0x7fdb981a82e4 > > [ 44.553809] Code: d2 48 63 f6 c4 41 7a 6f 0c 01 c4 41 7a 6f 14 09 > > c4 > > 41 7a 6f 24 11 c4 41 7a 6f 2c 31 c4 c1 31 6a c2 c4 c1 19 6a d5 c5 > > f9 6c > > f2 <c5> 79 6d c2 c5 f9 71 d6 08 c5 f9 db 44 24 20 c5 c1 71 f6 0b c5 > > f9 > > All code > > ======== > > 0: d2 48 63 rorb %cl,0x63(%rax) > > 3: f6 c4 41 test $0x41,%ah > > 6: 7a 6f jp 0x77 > > 8: 0c 01 or $0x1,%al > > a: c4 41 7a 6f 14 09 vmovdqu (%r9,%rcx,1),%xmm10 > > 10: c4 41 7a 6f 24 11 vmovdqu (%r9,%rdx,1),%xmm12 > > 16: c4 41 7a 6f 2c 31 vmovdqu (%r9,%rsi,1),%xmm13 > > 1c: c4 c1 31 6a c2 vpunpckhdq > > %xmm10,%xmm9,%xmm0 > > 21: c4 c1 19 6a d5 vpunpckhdq > > %xmm13,%xmm12,%xmm2 > > 26: c5 f9 6c f2 vpunpcklqdq > > %xmm2,%xmm0,%xmm6 > > 2a:* c5 79 6d c2 vpunpckhqdq > > %xmm2,%xmm0,%xmm8 > > <-- trapping instruction > > 2e: c5 f9 71 d6 08 vpsrlw $0x8,%xmm6,%xmm0 > > 33: c5 f9 db 44 24 20 vpand 0x20(%rsp),%xmm0,%xm > > m0 > > 39: c5 c1 71 f6 0b vpsllw $0xb,%xmm6,%xmm7 > > 3e: c5 .byte 0xc5 > > 3f: f9 stc > > > > Code starting with the faulting instruction > > =========================================== > > 0: c5 79 6d c2 vpunpckhqdq > > %xmm2,%xmm0,%xmm8 > > 4: c5 f9 71 d6 08 vpsrlw $0x8,%xmm6,%xmm0 > > 9: c5 f9 db 44 24 20 vpand 0x20(%rsp),%xmm0,%xm > > m0 > > f: c5 c1 71 f6 0b vpsllw $0xb,%xmm6,%xmm7 > > 14: c5 .byte 0xc5 > > 15: f9 stc > > [ 44.556477] RSP: 002b:00007fdb9cb10240 EFLAGS: 00000202 > > [ 44.557224] RAX: 0000000000122d40 RBX: 00007fdb5f9e8790 RCX: > > 0000000000122d40 > > [ 44.558200] RDX: 0000000000122d40 RSI: 0000000000122d40 RDI: > > 000055d7049b9368 > > [ 44.559088] RBP: 00007fdb9cb10ba0 R08: 00007fdb981a5174 R09: > > 00007fdb5e544040 > > [ 44.560042] R10: 000000000000ffff R11: 000000000000ffff R12: > > 0000000000000000 > > [ 44.560991] R13: 0000000000000000 R14: 0000000000005000 R15: > > 0000000000000000 > > [ 44.561965] Modules linked in: > > [ 44.562426] ---[ end trace 9a32eb9d31cb21a1 ]--- > > [ 44.563091] RIP: 0010:skb_panic (net/core/skbuff.c:110) > > [ 44.563721] Code: 4f 70 50 8b 87 bc 00 00 00 50 8b 87 b8 00 00 00 > > 50 > > ff b7 c8 00 00 00 4c 8b 8f c0 00 00 00 48 c7 c7 f0 af cf ad e8 43 > > 4c fb > > ff <0f> 0b 48 8b 14 24 48 c7 c1 20 23 b1 ad e8 ab ff ff ff 48 c7 c6 > > 60 > > All code > > ======== > > 0: 4f 70 50 rex.WRXB jo 0x53 > > 3: 8b 87 bc 00 00 00 mov 0xbc(%rdi),%eax > > 9: 50 push %rax > > a: 8b 87 b8 00 00 00 mov 0xb8(%rdi),%eax > > 10: 50 push %rax > > 11: ff b7 c8 00 00 00 pushq 0xc8(%rdi) > > 17: 4c 8b 8f c0 00 00 00 mov 0xc0(%rdi),%r9 > > 1e: 48 c7 c7 f0 af cf ad mov $0xffffffffadcfaff0, > > %rdi > > 25: e8 43 4c fb ff callq 0xfffffffffffb4c6d > > 2a:* 0f 0b ud2 <-- > > trapping > > instruction > > 2c: 48 8b 14 24 mov (%rsp),%rdx > > 30: 48 c7 c1 20 23 b1 ad mov $0xffffffffadb12320, > > %rcx > > 37: e8 ab ff ff ff callq 0xffffffffffffffe7 > > 3c: 48 rex.W > > 3d: c7 .byte 0xc7 > > 3e: c6 (bad) > > 3f: 60 (bad) > > > > Code starting with the faulting instruction > > =========================================== > > 0: 0f 0b ud2 > > 2: 48 8b 14 24 mov (%rsp),%rdx > > 6: 48 c7 c1 20 23 b1 ad mov $0xffffffffadb12320, > > %rcx > > d: e8 ab ff ff ff callq 0xffffffffffffffbd > > 12: 48 rex.W > > 13: c7 .byte 0xc7 > > 14: c6 (bad) > > 15: 60 (bad) > > [ 44.566252] RSP: 0000:ffffa651c134fc20 EFLAGS: 00010246 > > [ 44.567051] RAX: 000000000000008b RBX: 0000000000000010 RCX: > > 00000000ffffdfff > > [ 44.567947] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: > > 0000000000000000 > > [ 44.568839] RBP: ffffd77b009adac0 R08: ffffffffadf44b08 R09: > > 0000000000009ffb > > [ 44.569725] R10: 00000000ffffe000 R11: 3fffffffffffffff R12: > > ffff979ad2aa5600 > > [ 44.570608] R13: 0000000000000000 R14: ffff9799e6b6b000 R15: > > 0000000000000eb2 > > [ 44.571483] FS: 00007fdb9cb11700(0000) > > GS:ffff979aebd00000(0000) > > knlGS:0000000000000000 > > [ 44.572694] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 44.573474] CR2: 00007f99099f4024 CR3: 0000000129558005 CR4: > > 0000000000370ee0 > > [ 44.574531] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > > 0000000000000000 > > [ 44.575597] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: > > 0000000000000400 > > [ 44.576618] Kernel panic - not syncing: Fatal exception in > > interrupt > > [ 44.577996] Kernel Offset: 0x2ba00000 from 0xffffffff81000000 > > (relocation range: 0xffffffff80000000-0xffffffffbfffffff) > > > > Can you test this patch on the latest net branch? > > Thanks. > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index fa407eb8b457..78a01c71a17c 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -406,7 +406,7 @@ static struct sk_buff *page_to_skb(struct > virtnet_info *vi, > * add_recvbuf_mergeable() + get_mergeable_buf_len() > */ > truesize = headroom ? PAGE_SIZE : truesize; > - tailroom = truesize - len - headroom; > + tailroom = truesize - len - headroom - (hdr_padded_len - > hdr_len); > buf = p - headroom; > > len -= hdr_len; With this patch and the latest net branch I no longer get crashes. Thanks a lot for this, Corentin
