UBSAN warning in nouveau_bios.c:1528:8
From: Meelis Roos
Date: Thu Mar 01 2018 - 04:40:22 EST
This is the first time I have tried UBSAN on this specific machine
(onboard nforce 420 with HP BIOS on Nance mainboard). nouveau seems to
be working fine but gives this UBSAN warning:
[ 7.953957] nouveau 0000:00:0d.0: NVIDIA C61 (04c000a2)
[ 7.965101] nouveau 0000:00:0d.0: bios: version 05.61.32.25.02
[ 7.966141] nouveau 0000:00:0d.0: fb: 128 MiB of unknown memory type
[ 8.015336] [TTM] Zone kernel: Available graphics memory: 952564 kiB
[ 8.015339] [TTM] Initializing pool allocator
[ 8.015344] [TTM] Initializing DMA pool allocator
[ 8.015370] nouveau 0000:00:0d.0: DRM: VRAM: 125 MiB
[ 8.015372] nouveau 0000:00:0d.0: DRM: GART: 512 MiB
[ 8.015377] nouveau 0000:00:0d.0: DRM: TMDS table version 1.1
[ 8.015379] nouveau 0000:00:0d.0: DRM: DCB version 3.0
[ 8.015382] nouveau 0000:00:0d.0: DRM: DCB outp 00: 01000310 00000023
[ 8.015385] nouveau 0000:00:0d.0: DRM: DCB outp 01: 00110204 98830003
[ 8.015386] ================================================================================
[ 8.015423] UBSAN: Undefined behaviour in drivers/gpu/drm/nouveau/nouveau_bios.c:1528:8
[ 8.015455] shift exponent -1 is negative
[ 8.015482] CPU: 1 PID: 148 Comm: systemd-udevd Not tainted 4.16.0-rc3-00167-g97ace515f014 #1
[ 8.015483] Hardware name: HP-Pavilion RT589AA-ABU t3709.uk/Nance, BIOS 5.02 11/26/2006
[ 8.015485] Call Trace:
[ 8.015496] dump_stack+0x5a/0x99
[ 8.015500] ubsan_epilogue+0x9/0x40
[ 8.015503] __ubsan_handle_shift_out_of_bounds+0x124/0x160
[ 8.015506] ? _dev_info+0x67/0x90
[ 8.015509] ? dev_printk_emit+0x49/0x70
[ 8.015632] parse_dcb_entry+0x91e/0xd90 [nouveau]
[ 8.015712] ? parse_bit_M_tbl_entry+0x150/0x150 [nouveau]
[ 8.015791] olddcb_outp_foreach+0x66/0xa0 [nouveau]
[ 8.015870] nouveau_bios_init+0x23a/0x2250 [nouveau]
[ 8.015950] ? nouveau_ttm_init+0x3a4/0x710 [nouveau]
[ 8.016029] nouveau_drm_load+0x229/0xf10 [nouveau]
[ 8.016033] ? sysfs_do_create_link_sd+0xa6/0x170
[ 8.016067] drm_dev_register+0x1b7/0x330 [drm]
[ 8.016070] ? pci_enable_device_flags+0x160/0x1f0
[ 8.016091] drm_get_pci_dev+0xee/0x2e0 [drm]
[ 8.016172] nouveau_drm_probe+0x1dd/0x270 [nouveau]
[ 8.016175] pci_device_probe+0x113/0x1d0
[ 8.016178] driver_probe_device+0x375/0x720
[ 8.016180] __driver_attach+0xeb/0x150
[ 8.016181] ? driver_probe_device+0x720/0x720
[ 8.016183] bus_for_each_dev+0x84/0xe0
[ 8.016186] bus_add_driver+0x19f/0x340
[ 8.016188] driver_register+0x67/0x110
[ 8.016190] ? 0xffffffffc0cfb000
[ 8.016193] do_one_initcall+0x66/0x210
[ 8.016197] do_init_module+0xa7/0x2a9
[ 8.016199] load_module+0x2548/0x3d30
[ 8.016202] ? __symbol_put+0x60/0x60
[ 8.016205] ? kernel_read_file+0x21b/0x390
[ 8.016208] ? kernel_read_file_from_fd+0x52/0x90
[ 8.016210] SYSC_finit_module+0x124/0x150
[ 8.016212] do_syscall_64+0x7a/0x1f0
[ 8.016214] ? page_fault+0x2f/0x50
[ 8.016217] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 8.016219] RIP: 0033:0x7f2e47b82e19
[ 8.016220] RSP: 002b:00007ffdcdc157b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 8.016223] RAX: ffffffffffffffda RBX: 00005638b23c7250 RCX: 00007f2e47b82e19
[ 8.016224] RDX: 0000000000000000 RSI: 00007f2e4788d0ed RDI: 0000000000000019
[ 8.016225] RBP: 00007f2e4788d0ed R08: 0000000000000000 R09: 0000000000000000
[ 8.016226] R10: 0000000000000019 R11: 0000000000000246 R12: 0000000000000000
[ 8.016227] R13: 00005638b23c2ce0 R14: 0000000000020000 R15: 00005638b23c7250
[ 8.016228] ================================================================================
[ 8.016299] nouveau 0000:00:0d.0: DRM: DCB conn 00: 0000
[ 8.016301] nouveau 0000:00:0d.0: DRM: DCB conn 01: 1131
[ 8.016302] nouveau 0000:00:0d.0: DRM: DCB conn 02: 0110
[ 8.016304] nouveau 0000:00:0d.0: DRM: DCB conn 03: 0111
[ 8.016305] nouveau 0000:00:0d.0: DRM: DCB conn 04: 0113
[ 8.016626] nouveau 0000:00:0d.0: DRM: Saving VGA fonts
[ 8.052781] nouveau 0000:00:0d.0: DRM: DCB type 4 not known
[ 8.052784] nouveau 0000:00:0d.0: DRM: Unknown-1 has no encoders, removing
[ 8.053728] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 8.053729] [drm] Driver supports precise vblank timestamp query.
[ 8.055836] nouveau 0000:00:0d.0: DRM: MM: using M2MF for buffer copies
[ 8.084488] nouveau 0000:00:0d.0: DRM: allocated 1280x1024 fb: 0x9000, bo 0000000050f4b5d0
[ 8.084678] fbcon: nouveaufb (fb0) is primary device
[ 8.193959] Console: switching to colour frame buffer device 160x64
[ 8.195378] nouveau 0000:00:0d.0: fb0: nouveaufb frame buffer device
[ 8.212083] [drm] Initialized nouveau 1.3.1 20120801 for 0000:00:0d.0 on minor 0
--
Meelis Roos (mroos@xxxxxxxx)