Hello, I first thought this to be a Raspberry Pi thing, but its not. Looks like w1 driver is broken in some platform and busmaster independent way at least since kernel 3.2.x (which Raspberry Pi uses).
Here is what to do to repoduce the bug on x86: Get owfs from owfs.org and compile with w1 support or just install owserver from your favourite Linux distribution. I'm using version 2.8p15-1 from debian testing. 1. connect a 1-wire device to your computer and load the appropriate kernel module (I'm using a DS9490, so the module is ds2490.ko, but the bug also happens with other modules like w1-gpio) 2. run "owserver --error_print 2 --error_level 99 --foreground --w1" 3. run "owdir" on another terminal 4. system crashes with the following oops: --cut-- Driver for 1-wire Dallas network protocol. usbcore: registered new interface driver DS9490R w1_master_driver w1_bus_master1: Family 81 for 81.000000247ca7.41 is not registered. PGD 16ff067 PUD 1700067 PMD 0 Oops: 0000 [#1] PREEMPT SMP Modules linked in: ds2490 wire cn sha256_generic bluetooth crc16 binfmt_misc nfsd coretemp kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep microcode i2c_i801 uhci_hcd CPU 1 Pid: 4631, comm: owserver Not tainted 3.7.1 #1 /DG45ID RIP: 0010:[<ffffffff8104baf0>] [<ffffffff8104baf0>] kthread_should_stop+0x10/0x1b RSP: 0018:ffff880223d79b00 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff88022f144000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000286 RDI: 0000000000000000 RBP: 00000000ffffffff R08: ffff880223d78000 R09: 0000000000000000 R10: 0000000000000001 R11: dead000000100100 R12: ffff88022f1440b0 R13: 0000000000000040 R14: ffffffffa006f7fa R15: 0000000000000000 FS: 00007fdf7fd80700(0000) GS:ffff88023bc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffffffffffffffc8 CR3: 000000021c83c000 CR4: 00000000000407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process owserver (pid: 4631, threadinfo ffff880223d78000, task ffff880232f4e740) Stack: ffffffffa006ee9c ffff880232cc60c0 0100000000000000 0000000000000000 000000f000000001 ffffea000744b070 0000000000000001 ffff88021c8a3824 ffff88022f144000 ffff88021c8a3810 ffff88022f144038 0000000000000000 Call Trace: [<ffffffffa006ee9c>] ? w1_search+0x11d/0x188 [wire] [<ffffffffa006ef3e>] ? w1_search_process_cb+0x37/0x91 [wire] [<ffffffffa006fbbc>] ? w1_cn_callback+0x2fd/0x42e [wire] [<ffffffffa0034585>] ? cn_rx_skb+0xb7/0xea [cn] [<ffffffff81458e29>] ? netlink_unicast+0x123/0x1ae [<ffffffff814591a7>] ? netlink_sendmsg+0x27d/0x2ed [<ffffffff81428229>] ? sock_sendmsg+0x98/0xb5 [<ffffffff8142a7db>] ? sys_sendto+0xdb/0x104 [<ffffffff810ef7cd>] ? vfs_write+0xfa/0x141 [<ffffffff810efa27>] ? sys_write+0x60/0x77 [<ffffffff8150e0a9>] ? system_call_fastpath+0x16/0x1b Code: ff c6 05 93 71 73 00 01 eb 06 48 89 df 5b ff e0 48 c7 c0 ea ff ff ff 5b c3 90 90 65 48 8b 04 25 c0 b7 00 00 48 8b 80 88 02 00 00 <48> 8b 40 c8 48 d1 e8 83 e0 01 c3 f0 ff 47 10 48 8b 87 88 02 00 RSP <ffff880223d79b00> CR2: ffffffffffffffc8 ---[ end trace 3131d23f4378d60e ]--- --cut-- Regards Sven P.S.: Looks like this is the same bug, as the one reported at https://bugzilla.redhat.com/show_bug.cgi?id=857954 -- "Those who do not understand Unix are condemned to reinvent it, poorly" (Henry Spencer) /me is giggls@ircnet, http://sven.gegg.us/ on the Web -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
