[Bug 66077] New: Oops reading i915_error_state

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66077

          Priority: medium
            Bug ID: 66077
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Oops reading i915_error_state
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: All
          Reporter: chris at chris-wilson.co.uk
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

[76973.700434] BUG: unable to handle kernel paging request at 0000000000001000
    [76973.700468] IP: [<ffffffff811fb84d>] strnlen+0xd/0x40
    [76973.700494] PGD 10387b067 PUD 15411a067 PMD 0
    [76973.700515] Oops: 0000 [#1] SMP
    [76973.700529] Modules linked in: cpufreq_userspace cpufreq_powersave
cpufreq_stats cpufreq_conservative binfmt_misc nfs lockd fscache sunrpc
coretemp crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 ablk_helper
cryptd lrw gf128mul glue_helper iTCO_wdt iTCO_vendor_support microcode i2c_i801
lpc_ich mfd_core acpi_cpufreq mperf evdev processor ext4 crc16 jbd2 mbcache
sd_mod crc_t10dif ahci libahci libata scsi_mod thermal fan
    [76973.700718] CPU: 2 PID: 13279 Comm: intel_error_dec Not tainted
3.10.0-rc6+ #99
    [76973.700746] Hardware name: Intel Corporation Shark Bay Client
platform/Flathead Creek Crb, BIOS HSWLPTU1.86C.0109.R03.1301282055 01/28/2013
    [76973.700793] task: ffff880153fa2100 ti: ffff880152310000 task.ti:
ffff880152310000
    [76973.700820] RIP: 0010:[<ffffffff811fb84d>]  [<ffffffff811fb84d>]
strnlen+0xd/0x40
    [76973.700849] RSP: 0018:ffff880152311cb0  EFLAGS: 00010286
    [76973.700869] RAX: ffffffff81774000 RBX: ffff880154000072 RCX:
fffffffffffffffe
    [76973.700895] RDX: 0000000000001000 RSI: ffffffffffffffff RDI:
0000000000001000
    [76973.700920] RBP: ffff880152311cb0 R08: 000000000000ffff R09:
000000000000ffff
    [76973.700948] R10: 0000000000000000 R11: 000000000000000f R12:
0000000000001000
    [76973.700974] R13: ffff880154001000 R14: 00000000ffffffff R15:
0000000000000000
    [76973.701000] FS:  00007f00fc942880(0000) GS:ffff88015e300000(0000)
knlGS:0000000000000000
    [76973.701029] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [76973.701050] CR2: 0000000000001000 CR3: 000000015939a000 CR4:
00000000001407e0
    [76973.701075] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
    [76973.701103] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
    [76973.701128] Stack:
    [76973.701136]  ffff880152311ce8 ffffffff811fdafb ffff880154000072
ffff880154001000
    [76973.701167]  ffff880152311d58 ffffffff817a703e ffffffff817a703e
ffff880152311d48
    [76973.701198]  ffffffff811fe8a9 0000000a0000ffff 0000000000000001
ffff880154000000
    [76973.701229] Call Trace:
    [76973.701242]  [<ffffffff811fdafb>] string.isra.5+0x3b/0xf0
    [76973.701264]  [<ffffffff811fe8a9>] vsnprintf+0x1d9/0x670
    [76973.701286]  [<ffffffff812d13c9>] i915_error_printf+0xb9/0x160
    [76973.701311]  [<ffffffff812d15fc>] print_error_buffers+0x18c/0x1e0
    [76973.701335]  [<ffffffff812d1a5e>] i915_error_state_read+0x40e/0x8e0
    [76973.701361]  [<ffffffff81114527>] vfs_read+0x97/0x160
    [76973.701381]  [<ffffffff81114f74>] SyS_read+0x44/0x90
    [76973.701403]  [<ffffffff8141a552>] system_call_fastpath+0x16/0x1b
    [76973.701424] Code: c0 01 80 38 00 75 f7 48 29 f8 5d c3 31 c0 5d c3 66 66
66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 8d 4e ff 48 85 f6 48 89 e5 74 2a <80>
3f 00 74 25 48 89 f8 31 d2 eb 10 0f 1f 80 00 00 00 00 48 83
    [76973.701535] RIP  [<ffffffff811fb84d>] strnlen+0xd/0x40
    [76973.701550]  RSP <ffff880152311cb0>
    [76973.701559] CR2: 0000000000001000

The patch I sent doesn't fix the bug - it seems to be using "%s", (void *)4096.
Bizarre.

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