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Date: Sat, 1 Aug 2009 11:58:12 +0200 From: Michael Buesch <mb@...sch.de> To: dm-devel@...hat.com Cc: linux-kernel@...r.kernel.org Subject: NULL data pointer dereference in kcryptd The following oops happened while doing an mke2fs -j on a luks mapping. I think (I'm not entirely sure) that it was triggered by running the "sync" command simultaneously to the mke2fs. Both sync and mke2fs are stuck in D state after the oops. root 10916 0.4 0.0 1888 460 ? D< 22:39 0:03 /bin/sync root 11038 0.4 0.0 1888 460 ? D< 22:39 0:02 /bin/sync (Not sure why two. Maybe I poked it twice. I don't remember.) root 10375 7.3 0.0 0 0 ? D 22:25 1:54 [mke2fs] (Why are there brackets around mke2fs anyway?) root 353 0.0 0.0 0 0 ? S< 18:25 0:00 [crypto/0] root 354 0.0 0.0 0 0 ? S< 18:25 0:00 [crypto/1] root 355 0.0 0.0 0 0 ? S< 18:25 0:00 [crypto/2] root 356 0.0 0.0 0 0 ? S< 18:25 0:00 [crypto/3] root 10321 0.0 0.0 0 0 ? S< 22:24 0:00 [kcryptd_io] Kernel is 2.6.30 on PowerPC 64bit SMP. [15577.988487] Unable to handle kernel paging request for data at address 0x00000000 [15577.988494] Faulting instruction address: 0xc0000000000b8034 [15577.988499] Oops: Kernel access of bad area, sig: 11 [#1] [15577.988501] PREEMPT SMP NR_CPUS=4 NUMA PowerMac [15577.988506] Modules linked in: ppdev lp af_packet sbp2 ieee1394 loop b43 mac80211 cfg80211 ssb 8250_pci 8250 serial_core parport_pc parport uninorth_agp agpgart evdev [15577.988530] NIP: c0000000000b8034 LR: c000000000139bdc CTR: c000000000533290 [15577.988534] REGS: c0000001f022f8e0 TRAP: 0300 Not tainted (2.6.30) [15577.988536] MSR: 9000000000009032 <EE,ME,IR,DR> CR: 28004044 XER: 000fffff [15577.988546] DAR: 0000000000000000, DSISR: 0000000040000000 [15577.988549] TASK = c00000020fe74380[10322] 'kcryptd' THREAD: c0000001f022c000 CPU: 3 [15577.988552] GPR00: 00000000ffffffaf c0000001f022fb60 c000000000a4e928 0000000000011200 [15577.988559] GPR04: 000002037053b000 c0000002150b9e40 0000000000000000 c0000001e8ec8ef0 [15577.988565] GPR08: 0000000000000000 0000000000000000 c0000001bfacabf8 0000000000000000 [15577.988571] GPR12: 0000000028000044 c000000000a7f880 c000000000831ae0 c0000000009270a8 [15577.988577] GPR16: c000000000926d68 0000000000000000 f0000000046e6b58 0000000070e007b1 [15577.988583] GPR20: 00000000fffffdef 0000000000000200 c0000001bfacabe0 f0000000046e6b58 [15577.988590] GPR24: 0000000000000001 c0000001f022fbd0 c0000001f022fbe8 c000000203bd9ed1 [15577.988596] GPR28: c000000203bd9ea1 0000000000011210 c0000000009ac658 0000000000000000 [15577.988608] NIP [c0000000000b8034] .mempool_alloc+0x74/0x1a0 [15577.988614] LR [c000000000139bdc] .bio_alloc_bioset+0x4c/0x130 [15577.988616] Call Trace: [15577.988619] [c0000001f022fb60] [c0000001f022fbf0] 0xc0000001f022fbf0 (unreliable) [15577.988625] [c0000001f022fc40] [c000000000139bdc] .bio_alloc_bioset+0x4c/0x130 [15577.988632] [c0000001f022fcf0] [c0000000005334a0] .kcryptd_crypt+0x210/0x520 [15577.988637] [c0000001f022fde0] [c000000000068018] .worker_thread+0x248/0x3e0 [15577.988642] [c0000001f022ff00] [c00000000006e1e4] .kthread+0x84/0xe0 [15577.988648] [c0000001f022ff90] [c000000000021830] .kernel_thread+0x54/0x70 [15577.988651] Instruction dump: [15577.988654] 789d0020 7c7c1b78 780083e4 57a906f6 3b7c0030 6000ffaf 2e090000 7fa30038 [15577.988663] 3b410088 3b210070 e93c0020 e89c0018 <e8090000> f8410028 7c0903a6 e9690010 [15577.988674] ---[ end trace 13c61a64a39c7194 ]--- -- Greetings, Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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