On Fri, 06 Jul 2012 14:33:47 +0200 Arnold Schulz <arnysch@xxxxxxx> wrote: > Hi all, > > about 8 seconds after inserting the leap second, a running raid1 > resync crashed. Thanks for the report. I think you mean "8 minutes" (though it was really 7 minutes and 12 seconds). Also it was a 'data-check' rather than a 'resync' :-) It is extremely unlikely that the two are related. There appears to be a use-after-free bug in the data-check code which you have manage to hit. It has been there since 2006 (2.6.16) when data-check was added to raid1, and you are the first known victim. Well done! I'll submit a patch shortly. > > Not being able to assess if it is the raid code or some kernel > timer function to blame, I just present the log here. Thanks for providing the complete log. It was very helpful. NeilBrown > > Regards, > Arnold > > -------------------------------------------- > Jul 1 01:03:24 ip4-router kernel: md: data-check of RAID array md2 > Jul 1 01:03:24 ip4-router kernel: md: minimum _guaranteed_ speed: 1000 KB/sec/disk. > Jul 1 01:03:24 ip4-router kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. > Jul 1 01:03:24 ip4-router kernel: md: using 128k window, over a total of 1924209408k. > Jul 1 01:59:59 ip4-router kernel: Clock: inserting leap second 23:59:60 UTC > Jul 1 02:07:12 ip4-router kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 > Jul 1 02:07:12 ip4-router kernel: IP: [<ffffffff81300e18>] sync_request+0x628/0x970 > Jul 1 02:07:12 ip4-router kernel: PGD 0 > Jul 1 02:07:12 ip4-router kernel: Oops: 0000 [#1] PREEMPT SMP > Jul 1 02:07:12 ip4-router kernel: CPU 1 > Jul 1 02:07:12 ip4-router kernel: Modules linked in: parport_pc parport binfmt_misc deflate zlib_deflate zlib_inflate ctr > twofish_generic twofish_x86_64_3way twofish_x86_64 camellia_generic twofish_common camellia_x86_64 serpent_sse2_x86_64 > serpent_generic cryptd lrw blowfish_generic blowfish_x86_64 blowfish_common cast5 des_generic xcbc rmd160 sha512_generic > sha256_generic sha1_generic crypto_null af_key fuse mt2060 dvb_usb_dib0700 dib3000mc dib8000 dvb_usb dib0070 dib7000m dib7000p > dibx000_common dib0090 dvb_core hfcpci mISDN_core > Jul 1 02:07:12 ip4-router kernel: > Jul 1 02:07:12 ip4-router kernel: Pid: 17823, comm: md2_resync Not tainted 3.4.4 #109 To Be Filled By O.E.M. To Be Filled By > O.E.M./N68PV-GS > Jul 1 02:07:12 ip4-router kernel: RIP: 0010:[<ffffffff81300e18>] [<ffffffff81300e18>] sync_request+0x628/0x970 > Jul 1 02:07:12 ip4-router kernel: RSP: 0018:ffff8800224e9c30 EFLAGS: 00010202 > Jul 1 02:07:12 ip4-router kernel: RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000000000000001 > Jul 1 02:07:12 ip4-router kernel: RDX: 0000000000000002 RSI: ffff88006d7c4d30 RDI: 0000000000000000 > Jul 1 02:07:12 ip4-router kernel: RBP: ffff8800224e9ce0 R08: ffff8800224e8000 R09: 0000000000000001 > Jul 1 02:07:12 ip4-router kernel: R10: 000000000000013e R11: 0000000000000000 R12: 0000000000000080 > Jul 1 02:07:12 ip4-router kernel: R13: ffff88006b403840 R14: ffff88006c711680 R15: ffffea0000ca7580 > Jul 1 02:07:12 ip4-router kernel: FS: 00007f441eafa700(0000) GS:ffff88006fd00000(0000) knlGS:0000000000000000 > Jul 1 02:07:12 ip4-router kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > Jul 1 02:07:12 ip4-router kernel: CR2: 0000000000000050 CR3: 000000005c53f000 CR4: 00000000000007e0 > Jul 1 02:07:12 ip4-router kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > Jul 1 02:07:12 ip4-router kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Jul 1 02:07:12 ip4-router kernel: Process md2_resync (pid: 17823, threadinfo ffff8800224e8000, task ffff88006d7c4d30) > Jul 1 02:07:12 ip4-router kernel: Stack: > Jul 1 02:07:12 ip4-router kernel: 00000000e5623600 ffff880000000000 0000000029ca6880 0000008029ca5f00 > Jul 1 02:07:12 ip4-router kernel: ffff8800224e9e2c 0000000000000000 0000000200000000 0000000029ca6900 > Jul 1 02:07:12 ip4-router kernel: 0000000029ca6900 0000000000000080 0000000000001000 ffff88006b68dc00 > Jul 1 02:07:12 ip4-router kernel: Call Trace: > Jul 1 02:07:12 ip4-router kernel: [<ffffffff813163e3>] md_do_sync+0x7d3/0xc60 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff8104ac90>] ? abort_exclusive_wait+0xb0/0xb0 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff81312f7e>] md_thread+0x10e/0x140 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff81312e70>] ? md_register_thread+0x110/0x110 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff8104a4ee>] kthread+0x8e/0xa0 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff8146b4f4>] kernel_thread_helper+0x4/0x10 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff8104a460>] ? kthread_worker_fn+0x130/0x130 > Jul 1 02:07:12 ip4-router kernel: [<ffffffff8146b4f0>] ? gs_change+0xb/0xb > Jul 1 02:07:12 ip4-router kernel: Code: 0f 84 35 02 00 00 8b 45 84 41 89 06 41 8b 55 10 48 8b 45 98 8d 0c 12 85 c9 0f 8e 85 fa > ff ff 31 db 66 90 48 63 c3 49 8b 7c c6 58 <48> 81 7f 50 10 f4 2f 81 0f 84 b2 01 00 00 8d 04 12 ff c3 39 d8 > Jul 1 02:07:12 ip4-router kernel: RIP [<ffffffff81300e18>] sync_request+0x628/0x970 > Jul 1 02:07:12 ip4-router kernel: RSP <ffff8800224e9c30> > Jul 1 02:07:12 ip4-router kernel: CR2: 0000000000000050 > Jul 1 02:07:12 ip4-router kernel: ---[ end trace 79aec5e8bd378abc ]--- > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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