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    SubjectRe: input0: bad kobj_uevent_env content in show_uevent()
    On Sun, Sep 02, 2012 at 04:34:02PM +0800, Fengguang Wu wrote:
    > It's more than the input device that can trigger the panic.
    > Here is another trace which panics on accessing dmi/id/uevent:
    >
    > [ 32.380795] sysfs_read_file: /sys/devices/virtual/dmi/id/uevent
    > [ 32.399379] dmi id: uevent 73 env[1677721600]: id/.../id
    > [ 32.400780] uevent 0 env[0]: (null)
    > [ 32.401695] uevent 7 env[1]: (null)
    > ...

    And one more:

    [ 49.861849] sysfs_read_file: /sys/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:02/PNP0400:00/uevent
    [ 49.863815] acpi PNP0400:00: uevent 13 env[1627389952]: PNP0400:00/.../PNP0400:00
    [ 49.865698] uevent 0 env[0]: (null)
    [ 49.866581] uevent 7 env[1]: (null)

    Thanks,
    Fengguang

    > [ 32.478415] general protection fault: 0000 [#1] PREEMPT
    > [ 32.479953] CPU 0
    > [ 32.480433] Pid: 114, comm: trinity-child0 Not tainted 3.6.0-rc4-bisect2-00001-gb6d86d3-dirty #26 Bochs Bochs
    > [ 32.482995] RIP: 0010:[<ffffffff81266c33>] [<ffffffff81266c33>] strnlen+0x23/0x70
    > ...
    > [ 32.486234] Call Trace:
    > [ 32.486234] [<ffffffff81268d5c>] string.isra.4+0x4c/0x120
    > [ 32.486234] [<ffffffff81269f19>] vsnprintf+0x2c9/0x900
    > [ 32.486234] [<ffffffff8126a9c9>] vscnprintf+0x19/0x50
    > [ 32.486234] [<ffffffff8105f8c7>] vprintk_emit+0xe7/0x750
    > [ 32.486234] [<ffffffff81a49ba9>] printk+0x4f/0x58
    > [ 32.486234] [<ffffffff8150522b>] show_uevent+0x1cb/0x220
    > [ 32.486234] [<ffffffff81501dcb>] dev_attr_show+0x2b/0x90
    > [ 32.486234] [<ffffffff81174bea>] ? sysfs_read_file+0x18a/0x320
    > [ 32.486234] [<ffffffff810f2974>] ? __get_free_pages+0x24/0xc0
    > [ 32.486234] [<ffffffff81174c2d>] sysfs_read_file+0x1cd/0x320
    >
    > Thanks,
    > Fengguang
    >
    > On Sun, Sep 02, 2012 at 03:59:46PM +0800, Fengguang Wu wrote:
    > > Hi all,
    > >
    > > After the __devinit* removal series, I can still get kernel panic in
    > > show_uevent(). So there are more sources of bug..
    > >
    > > Debug patch:
    > >
    > > @@ -343,8 +343,11 @@ static ssize_t show_uevent(struct device
    > > goto out;
    > >
    > > /* copy keys to file */
    > > - for (i = 0; i < env->envp_idx; i++)
    > > + dev_err(dev, "uevent %d env[%d]: %s/.../%s\n", env->buflen, env->envp_idx, top_kobj->name, dev->kobj.name);
    > > + for (i = 0; i < env->envp_idx; i++) {
    > > + printk(KERN_ERR "uevent %d env[%d]: %s\n", (int)count, i, env->envp[i]);
    > > count += sprintf(&buf[count], "%s\n", env->envp[i]);
    > > + }
    > >
    > > Oops message, the env[] is again not properly initilized:
    > >
    > > [ 44.068623] input input0: uevent 61 env[805306368]: input0/.../input0
    > > [ 44.069552] uevent 0 env[0]: (null)
    > > [ 44.070107] uevent 7 env[1]: (null)
    > > [ 44.070609] uevent 14 env[2]: (null)
    > > [ 44.071136] uevent 21 env[3]: (null)
    > > [ 44.071637] uevent 28 env[4]: (null)
    > > [ 44.072166] uevent 35 env[5]: (null)
    > > [ 44.072674] uevent 42 env[6]: (null)
    > > [ 44.073188] uevent 49 env[7]: (null)
    > > [ 44.073694] uevent 56 env[8]: (null)
    > > [ 44.074207] uevent 63 env[9]: (null)
    > > [ 44.074709] uevent 70 env[10]: (null)
    > > [ 44.075235] uevent 77 env[11]: (null)
    > > [ 44.075748] uevent 84 env[12]: (null)
    > > [ 44.076270] uevent 91 env[13]: (null)
    > > [ 44.076783] uevent 98 env[14]: (null)
    > > [ 44.077310] uevent 105 env[15]: (null)
    > > [ 44.077843] uevent 112 env[16]: (null)
    > > [ 44.078384] uevent 119 env[17]: (null)
    > > [ 44.078911] uevent 126 env[18]: (null)
    > > [ 44.079451] uevent 133 env[19]: (null)
    > > [ 44.079979] uevent 140 env[20]: (null)
    > > [ 44.080537] uevent 147 env[21]: (null)
    > > [ 44.081077] uevent 154 env[22]: (null)
    > > [ 44.081614] uevent 161 env[23]: (null)
    > > [ 44.082151] uevent 168 env[24]: (null)
    > > [ 44.082680] uevent 175 env[25]: (null)
    > > [ 44.083217] uevent 182 env[26]: (null)
    > > [ 44.083740] uevent 189 env[27]: (null)
    > > [ 44.084282] uevent 196 env[28]: (null)
    > > [ 44.084810] uevent 203 env[29]: (null)
    > > [ 44.085350] uevent 210 env[30]: (null)
    > > [ 44.085889] uevent 217 env[31]: (null)
    > > [ 44.086434] general protection fault: 0000 [#1] PREEMPT
    > > [ 44.087232] CPU 0
    > > [ 44.087505] Pid: 135, comm: trinity-child0 Not tainted 3.6.0-rc4-bisect2-00001-gb6d86d3-dirty #25 Bochs Bochs
    > > [ 44.088928] RIP: 0010:[<ffffffff81266ba3>] [<ffffffff81266ba3>] strnlen+0x23/0x70
    > > [ 44.090037] RSP: 0018:ffff8800073dfc58 EFLAGS: 00010006
    > > [ 44.090522] RAX: ffff8800073dfe00 RBX: ffffffff8291f0f6 RCX: 000000000001c66a
    > > [ 44.090522] RDX: 3030313330000000 RSI: ffffffffffffffff RDI: 3030313330000000
    > > [ 44.090522] RBP: ffff8800073dfc58 R08: 000000000000ffff R09: 000000000000ffff
    > > [ 44.090522] R10: 0000000000000001 R11: 0000000000000001 R12: 3030313330000000
    > > [ 44.090522] R13: ffffffff8291f4c0 R14: 000000000000ffff R15: 0000000000000000
    > > [ 44.090522] FS: 00007ff846958700(0000) GS:ffffffff8222d000(0000) knlGS:0000000000000000
    > > [ 44.090522] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > > [ 44.090522] CR2: 00000000030e5000 CR3: 00000000073ee000 CR4: 00000000000006b0
    > > [ 44.090522] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > > [ 44.090522] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > > [ 44.090522] Process trinity-child0 (pid: 135, threadinfo ffff8800073de000, task ffff880006c0c000)
    > > [ 44.090522] Stack:
    > > [ 44.090522] ffff8800073dfc98 ffffffff81268ccc ffffffff82252f18 ffffffff81faf19e
    > > [ 44.090522] ffffffff8291f4c0 ffff8800073dfdd0 ffffffff81faf19e ffffffff8291f0f6
    > > [ 44.090522] ffff8800073dfd18 ffffffff81269e89 ffffffff82250002 ffffffff82252ea0
    > > [ 44.090522] Call Trace:
    > > [ 44.090522] [<ffffffff81268ccc>] string.isra.4+0x4c/0x120
    > > [ 44.090522] [<ffffffff81269e89>] vsnprintf+0x2c9/0x900
    > > [ 44.090522] [<ffffffff8126a939>] vscnprintf+0x19/0x50
    > > [ 44.090522] [<ffffffff8105f8c7>] vprintk_emit+0xe7/0x750
    > > [ 44.090522] [<ffffffff81a49b19>] printk+0x4f/0x58
    > > [ 44.090522] [<ffffffff8150519b>] show_uevent+0x1cb/0x220
    > > [ 44.090522] [<ffffffff81501d3b>] dev_attr_show+0x2b/0x90
    > > [ 44.090522] [<ffffffff81174b72>] ? sysfs_read_file+0x112/0x290
    > > [ 44.090522] [<ffffffff810f2974>] ? __get_free_pages+0x24/0xc0
    > > [ 44.090522] [<ffffffff81174bae>] sysfs_read_file+0x14e/0x290
    > > [ 44.090522] [<ffffffff81125b07>] vfs_read+0xc7/0x200
    > > [ 44.090522] [<ffffffff81125fa0>] sys_read+0x60/0xd0
    > > [ 44.090522] [<ffffffff81a5d737>] system_call_fastpath+0x16/0x1b
    > >
    > > Thanks,
    > > Fengguang


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