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5c37711d9f
In merge mode, when xdp is enabled, if the headroom of buf is smaller
than virtnet_get_headroom(), xdp_linearize_page() will be called but the
variable of "headroom" is still 0, which leads to wrong logic after
entering page_to_skb().
[ 16.600944] BUG: unable to handle page fault for address: ffffecbfff7b43c8[ 16.602175] #PF: supervisor read access in kernel mode
[ 16.603350] #PF: error_code(0x0000) - not-present page
[ 16.604200] PGD 0 P4D 0
[ 16.604686] Oops: 0000 [#1] SMP PTI
[ 16.605306] CPU: 4 PID: 715 Comm: sh Tainted: G B 5.12.0+ #312
[ 16.606429] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/04
[ 16.608217] RIP: 0010:unmap_page_range+0x947/0xde0
[ 16.609014] Code: 00 00 08 00 48 83 f8 01 45 19 e4 41 f7 d4 41 83 e4 03 e9 a4 fd ff ff e8 b7 63 ed ff 4c 89 e0 48 c1 e0 065
[ 16.611863] RSP: 0018:ffffc90002503c58 EFLAGS: 00010286
[ 16.612720] RAX: ffffecbfff7b43c0 RBX: 00007f19f7203000 RCX: ffffffff812ff359
[ 16.613853] RDX: ffff888107778000 RSI: 0000000000000000 RDI: 0000000000000005
[ 16.614976] RBP: ffffea000425e000 R08: 0000000000000000 R09: 3030303030303030
[ 16.616124] R10: ffffffff82ed7d94 R11: 6637303030302052 R12: 7c00000afffded0f
[ 16.617276] R13: 0000000000000001 R14: ffff888119ee7010 R15: 00007f19f7202000
[ 16.618423] FS: 0000000000000000(0000) GS:ffff88842fd00000(0000) knlGS:0000000000000000
[ 16.619738] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.620670] CR2: ffffecbfff7b43c8 CR3: 0000000103220005 CR4: 0000000000370ee0
[ 16.621792] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 16.622920] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 16.624047] Call Trace:
[ 16.624525] ? release_pages+0x24d/0x730
[ 16.625209] unmap_single_vma+0xa9/0x130
[ 16.625885] unmap_vmas+0x76/0xf0
[ 16.626480] exit_mmap+0xa0/0x210
[ 16.627129] mmput+0x67/0x180
[ 16.627673] do_exit+0x3d1/0xf10
[ 16.628259] ? do_user_addr_fault+0x231/0x840
[ 16.629000] do_group_exit+0x53/0xd0
[ 16.629631] __x64_sys_exit_group+0x1d/0x20
[ 16.630354] do_syscall_64+0x3c/0x80
[ 16.630988] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 16.631828] RIP: 0033:0x7f1a043d0191
[ 16.632464] Code: Unable to access opcode bytes at RIP 0x7f1a043d0167.
[ 16.633502] RSP: 002b:00007ffe3d993308 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[ 16.634737] RAX: ffffffffffffffda RBX: 00007f1a044c9490 RCX: 00007f1a043d0191
[ 16.635857] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
[ 16.636986] RBP: 0000000000000000 R08: ffffffffffffff88 R09: 0000000000000001
[ 16.638120] R10: 0000000000000008 R11: 0000000000000246 R12: 00007f1a044c9490
[ 16.639245] R13: 0000000000000001 R14: 00007f1a044c9968 R15: 0000000000000000
[ 16.640408] Modules linked in:
[ 16.640958] CR2: ffffecbfff7b43c8
[ 16.641557] ---[ end trace bc4891c6ce46354c ]---
[ 16.642335] RIP: 0010:unmap_page_range+0x947/0xde0
[ 16.643135] Code: 00 00 08 00 48 83 f8 01 45 19 e4 41 f7 d4 41 83 e4 03 e9 a4 fd ff ff e8 b7 63 ed ff 4c 89 e0 48 c1 e0 065
[ 16.645983] RSP: 0018:ffffc90002503c58 EFLAGS: 00010286
[ 16.646845] RAX: ffffecbfff7b43c0 RBX: 00007f19f7203000 RCX: ffffffff812ff359
[ 16.647970] RDX: ffff888107778000 RSI: 0000000000000000 RDI: 0000000000000005
[ 16.649091] RBP: ffffea000425e000 R08: 0000000000000000 R09: 3030303030303030
[ 16.650250] R10: ffffffff82ed7d94 R11: 6637303030302052 R12: 7c00000afffded0f
[ 16.651394] R13: 0000000000000001 R14: ffff888119ee7010 R15: 00007f19f7202000
[ 16.652529] FS: 0000000000000000(0000) GS:ffff88842fd00000(0000) knlGS:0000000000000000
[ 16.653887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.654841] CR2: ffffecbfff7b43c8 CR3: 0000000103220005 CR4: 0000000000370ee0
[ 16.655992] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 16.657150] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 16.658290] Kernel panic - not syncing: Fatal exception
[ 16.659613] Kernel Offset: disabled
[ 16.660234] ---[ end Kernel panic - not syncing: Fatal exception ]---
Fixes:
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|---|---|---|
| .. | ||
| accessibility | ||
| acpi | ||
| amba | ||
| android | ||
| ata | ||
| atm | ||
| auxdisplay | ||
| base | ||
| bcma | ||
| block | ||
| bluetooth | ||
| bus | ||
| cdrom | ||
| char | ||
| clk | ||
| clocksource | ||
| comedi | ||
| connector | ||
| counter | ||
| cpufreq | ||
| cpuidle | ||
| crypto | ||
| cxl | ||
| dax | ||
| dca | ||
| devfreq | ||
| dio | ||
| dma | ||
| dma-buf | ||
| edac | ||
| eisa | ||
| extcon | ||
| firewire | ||
| firmware | ||
| fpga | ||
| fsi | ||
| gnss | ||
| gpio | ||
| gpu | ||
| greybus | ||
| hid | ||
| hsi | ||
| hv | ||
| hwmon | ||
| hwspinlock | ||
| hwtracing | ||
| i2c | ||
| i3c | ||
| ide | ||
| idle | ||
| iio | ||
| infiniband | ||
| input | ||
| interconnect | ||
| iommu | ||
| ipack | ||
| irqchip | ||
| isdn | ||
| leds | ||
| lightnvm | ||
| macintosh | ||
| mailbox | ||
| mcb | ||
| md | ||
| media | ||
| memory | ||
| memstick | ||
| message | ||
| mfd | ||
| misc | ||
| mmc | ||
| most | ||
| mtd | ||
| mux | ||
| net | ||
| nfc | ||
| ntb | ||
| nubus | ||
| nvdimm | ||
| nvme | ||
| nvmem | ||
| of | ||
| opp | ||
| parisc | ||
| parport | ||
| pci | ||
| pcmcia | ||
| perf | ||
| phy | ||
| pinctrl | ||
| platform | ||
| pnp | ||
| power | ||
| powercap | ||
| pps | ||
| ps3 | ||
| ptp | ||
| pwm | ||
| rapidio | ||
| ras | ||
| regulator | ||
| remoteproc | ||
| reset | ||
| rpmsg | ||
| rtc | ||
| s390 | ||
| sbus | ||
| scsi | ||
| sh | ||
| siox | ||
| slimbus | ||
| soc | ||
| soundwire | ||
| spi | ||
| spmi | ||
| ssb | ||
| staging | ||
| target | ||
| tc | ||
| tee | ||
| thermal | ||
| thunderbolt | ||
| tty | ||
| uio | ||
| usb | ||
| vdpa | ||
| vfio | ||
| vhost | ||
| video | ||
| virt | ||
| virtio | ||
| visorbus | ||
| vlynq | ||
| vme | ||
| w1 | ||
| watchdog | ||
| xen | ||
| zorro | ||
| Kconfig | ||
| Makefile | ||