Hello there, I found a bug on my system. I do not know if this was already reported. I can't find it anywhere. Would you please have a look at this trace (attached) Unfortunately it happens completely random (after few days in this case, with 4.1.0 it was in matter of hours) and I'm not able to bisect this. Regards Tomas
Jul 29 08:47:53 anakin kernel: BUG: unable to handle kernel NULL pointer dereference at (null) Jul 29 08:47:53 anakin kernel: IP: [<ffffffff812d2226>] get_free_stripe+0x1b/0x7e Jul 29 08:47:53 anakin kernel: PGD 32faa7067 PUD 172863067 PMD 0 Jul 29 08:47:53 anakin kernel: Oops: 0000 [#1] PREEMPT SMP Jul 29 08:47:53 anakin kernel: Modules linked in: veth xt_CHECKSUM iptable_mangle xt_addrtype dm_thin_pool dm_persistent_data libcrc32c dm_bio_prison dm_bufio ebtables algif_skcipher af_alg it87 hwmon_vid cls_route cls_u32 cls_fw sch_sfq sch_htb ctr ccm xt_REDIRECT nf_nat_redirect xt_nat ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_limit ipt_REJECT nf_reject_ipv4 xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip6table_filter ip6_tables iptable_filter ip_tables x_tables sit tunnel4 ip_tunnel loop r8169 mii fuse iwldvm led_class mac80211 kvm_intel kvm i2c_i801 iwlwifi i2c_core alx cfg80211 mdio e1000e Jul 29 08:47:53 anakin kernel: CPU: 0 PID: 15122 Comm: git Not tainted 4.1.3 #1 Jul 29 08:47:53 anakin kernel: Hardware name: Gigabyte Technology Co., Ltd. Z87N-WIFI/Z87N-WIFI, BIOS F3d 06/19/2013 Jul 29 08:47:53 anakin kernel: task: ffff880426a19080 ti: ffff880047864000 task.ti: ffff880047864000 Jul 29 08:47:53 anakin kernel: RIP: 0010:[<ffffffff812d2226>] [<ffffffff812d2226>] get_free_stripe+0x1b/0x7e Jul 29 08:47:53 anakin kernel: RSP: 0018:ffff8800478676c0 EFLAGS: 00010013 Jul 29 08:47:53 anakin kernel: RAX: ffff88042b2d4d60 RBX: ffff88042b2d4c00 RCX: ffff88042b2d4d68 Jul 29 08:47:53 anakin kernel: RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88042b2d4c00 Jul 29 08:47:53 anakin kernel: RBP: 00000000ffffffff R08: 0000000000000007 R09: ffff88042b2da000 Jul 29 08:47:53 anakin kernel: R10: ffff880434a2de00 R11: ffff880432f5cf80 R12: ffff88042b2d4c06 Jul 29 08:47:53 anakin kernel: R13: ffff88042b2d4e40 R14: 0000000000000000 R15: 0000000000000d66 Jul 29 08:47:53 anakin kernel: FS: 00007f054d7fa700(0000) GS:ffff88043f200000(0000) knlGS:0000000000000000 Jul 29 08:47:53 anakin kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jul 29 08:47:53 anakin kernel: CR2: 0000000000000000 CR3: 0000000378d50000 CR4: 00000000001427f0 Jul 29 08:47:53 anakin kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jul 29 08:47:53 anakin kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Jul 29 08:47:53 anakin kernel: Stack: Jul 29 08:47:53 anakin kernel: ffffffff812d5ac1 0000000000000073 ffff88042b2d4c00 ffff880047867738 Jul 29 08:47:53 anakin kernel: ffffffff812d5b2b 0000000000000df3 0000000000000080 0000000000000000 Jul 29 08:47:53 anakin kernel: ffffffff810d55f6 0000000000001fb8 0000000000000e80 0000000000000080 Jul 29 08:47:53 anakin kernel: Call Trace: Jul 29 08:47:53 anakin kernel: [<ffffffff812d5ac1>] ? drop_one_stripe+0x30/0x78 Jul 29 08:47:53 anakin kernel: [<ffffffff812d5b2b>] ? raid5_cache_scan+0x22/0x33 Jul 29 08:47:53 anakin kernel: [<ffffffff810d55f6>] ? shrink_slab+0x1b8/0x22e Jul 29 08:47:53 anakin kernel: [<ffffffff810d7d3d>] ? shrink_zone+0x160/0x24c Jul 29 08:47:53 anakin kernel: [<ffffffff810d7fc2>] ? do_try_to_free_pages+0x199/0x32e Jul 29 08:47:53 anakin kernel: [<ffffffff810d81e5>] ? try_to_free_pages+0x8e/0x94 Jul 29 08:47:53 anakin kernel: [<ffffffff810d0523>] ? __alloc_pages_nodemask+0x53c/0x79f Jul 29 08:47:53 anakin kernel: [<ffffffff810faf62>] ? new_slab+0xa2/0x338 Jul 29 08:47:53 anakin kernel: [<ffffffff813dc214>] ? __slab_alloc.isra.67.constprop.69+0x20a/0x304 Jul 29 08:47:53 anakin kernel: [<ffffffff811705d0>] ? ext4_alloc_inode+0x12/0x176 Jul 29 08:47:53 anakin kernel: [<ffffffff811634db>] ? ext4_map_blocks+0x1d2/0x3b4 Jul 29 08:47:53 anakin kernel: [<ffffffff81192f18>] ? ext4_fname_crypto_free_buffer+0x11/0x1a Jul 29 08:47:53 anakin kernel: [<ffffffff811705d0>] ? ext4_alloc_inode+0x12/0x176 Jul 29 08:47:53 anakin kernel: [<ffffffff810fc049>] ? kmem_cache_alloc+0x7a/0x12a Jul 29 08:47:53 anakin kernel: [<ffffffff811705d0>] ? ext4_alloc_inode+0x12/0x176 Jul 29 08:47:53 anakin kernel: [<ffffffff8111e01b>] ? alloc_inode+0x14/0x6e Jul 29 08:47:53 anakin kernel: [<ffffffff8111ed9f>] ? iget_locked+0x5f/0x13a Jul 29 08:47:53 anakin kernel: [<ffffffff81163b66>] ? ext4_iget+0x27/0x8b9 Jul 29 08:47:53 anakin kernel: [<ffffffff8111cc60>] ? __d_lookup+0x125/0x137 Jul 29 08:47:53 anakin kernel: [<ffffffff8116bcf8>] ? ext4_lookup+0xe7/0x1ae Jul 29 08:47:53 anakin kernel: [<ffffffff81111bec>] ? lookup_real+0x23/0x3d Jul 29 08:47:53 anakin kernel: [<ffffffff811124bc>] ? __lookup_hash+0x2a/0x31 Jul 29 08:47:53 anakin kernel: [<ffffffff81113ba1>] ? lookup_slow+0x39/0x9c Jul 29 08:47:53 anakin kernel: [<ffffffff811154f3>] ? path_lookupat+0xe1/0x665 Jul 29 08:47:53 anakin kernel: [<ffffffff81115a92>] ? filename_lookup+0x1b/0x58 Jul 29 08:47:53 anakin kernel: [<ffffffff81116d53>] ? user_path_at_empty+0x48/0x7d Jul 29 08:47:53 anakin kernel: [<ffffffff810e3102>] ? list_lru_add+0x66/0x86 Jul 29 08:47:53 anakin kernel: [<ffffffff8110e57e>] ? cp_new_stat+0x111/0x124 Jul 29 08:47:53 anakin kernel: [<ffffffff8110e3f7>] ? vfs_fstatat+0x3e/0x8d Jul 29 08:47:53 anakin kernel: [<ffffffff8110e7fd>] ? SyS_newlstat+0x12/0x2b Jul 29 08:47:53 anakin kernel: [<ffffffff813e1a17>] ? system_call_fastpath+0x12/0x6a Jul 29 08:47:53 anakin kernel: Code: 74 0d ff ca 39 d7 0f 94 c0 0f b6 c0 c3 31 c0 c3 48 63 c6 48 83 c0 17 48 c1 e0 04 48 01 f8 48 8d 48 08 48 39 09 74 64 48 8b 50 08 <4c> 8b 0a 48 8d 42 f0 4c 8b 42 08 4d 89 41 08 4d 89 08 4c 8b 4a Jul 29 08:47:53 anakin kernel: RIP [<ffffffff812d2226>] get_free_stripe+0x1b/0x7e Jul 29 08:47:53 anakin kernel: RSP <ffff8800478676c0> Jul 29 08:47:53 anakin kernel: CR2: 0000000000000000 Jul 29 08:47:53 anakin kernel: ---[ end trace 8b8e4636b0689591 ]---
