# git rev-parse -q --verify 234b69e3e089d850a98e7b3145bd00e9b52b1111^{commit}
234b69e3e089d850a98e7b3145bd00e9b52b1111
already have revision, skipping fetch
# git checkout -q -f -B kisskb 234b69e3e089d850a98e7b3145bd00e9b52b1111
# git clean -qxdf
# < git log -1
# commit 234b69e3e089d850a98e7b3145bd00e9b52b1111
# Author: Junxiao Bi <junxiao.bi@oracle.com>
# Date:   Thu Sep 20 12:22:51 2018 -0700
# 
#     ocfs2: fix ocfs2 read block panic
#     
#     While reading block, it is possible that io error return due to underlying
#     storage issue, in this case, BH_NeedsValidate was left in the buffer head.
#     Then when reading the very block next time, if it was already linked into
#     journal, that will trigger the following panic.
#     
#     [203748.702517] kernel BUG at fs/ocfs2/buffer_head_io.c:342!
#     [203748.702533] invalid opcode: 0000 [#1] SMP
#     [203748.702561] Modules linked in: ocfs2 ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs sunrpc dm_switch dm_queue_length dm_multipath bonding be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i iw_cxgb4 cxgb4 cxgb3i libcxgbi iw_cxgb3 cxgb3 mdio ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ipmi_devintf iTCO_wdt iTCO_vendor_support dcdbas ipmi_ssif i2c_core ipmi_si ipmi_msghandler acpi_pad pcspkr sb_edac edac_core lpc_ich mfd_core shpchp sg tg3 ptp pps_core ext4 jbd2 mbcache2 sr_mod cdrom sd_mod ahci libahci megaraid_sas wmi dm_mirror dm_region_hash dm_log dm_mod
#     [203748.703024] CPU: 7 PID: 38369 Comm: touch Not tainted 4.1.12-124.18.6.el6uek.x86_64 #2
#     [203748.703045] Hardware name: Dell Inc. PowerEdge R620/0PXXHP, BIOS 2.5.2 01/28/2015
#     [203748.703067] task: ffff880768139c00 ti: ffff88006ff48000 task.ti: ffff88006ff48000
#     [203748.703088] RIP: 0010:[<ffffffffa05e9f09>]  [<ffffffffa05e9f09>] ocfs2_read_blocks+0x669/0x7f0 [ocfs2]
#     [203748.703130] RSP: 0018:ffff88006ff4b818  EFLAGS: 00010206
#     [203748.703389] RAX: 0000000008620029 RBX: ffff88006ff4b910 RCX: 0000000000000000
#     [203748.703885] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00000000023079fe
#     [203748.704382] RBP: ffff88006ff4b8d8 R08: 0000000000000000 R09: ffff8807578c25b0
#     [203748.704877] R10: 000000000f637376 R11: 000000003030322e R12: 0000000000000000
#     [203748.705373] R13: ffff88006ff4b910 R14: ffff880732fe38f0 R15: 0000000000000000
#     [203748.705871] FS:  00007f401992c700(0000) GS:ffff880bfebc0000(0000) knlGS:0000000000000000
#     [203748.706370] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
#     [203748.706627] CR2: 00007f4019252440 CR3: 00000000a621e000 CR4: 0000000000060670
#     [203748.707124] Stack:
#     [203748.707371]  ffff88006ff4b828 ffffffffa0609f52 ffff88006ff4b838 0000000000000001
#     [203748.707885]  0000000000000000 0000000000000000 ffff880bf67c3800 ffffffffa05eca00
#     [203748.708399]  00000000023079ff ffffffff81c58b80 0000000000000000 0000000000000000
#     [203748.708915] Call Trace:
#     [203748.709175]  [<ffffffffa0609f52>] ? ocfs2_inode_cache_io_unlock+0x12/0x20 [ocfs2]
#     [203748.709680]  [<ffffffffa05eca00>] ? ocfs2_empty_dir_filldir+0x80/0x80 [ocfs2]
#     [203748.710185]  [<ffffffffa05ec0cb>] ocfs2_read_dir_block_direct+0x3b/0x200 [ocfs2]
#     [203748.710691]  [<ffffffffa05f0fbf>] ocfs2_prepare_dx_dir_for_insert.isra.57+0x19f/0xf60 [ocfs2]
#     [203748.711204]  [<ffffffffa065660f>] ? ocfs2_metadata_cache_io_unlock+0x1f/0x30 [ocfs2]
#     [203748.711716]  [<ffffffffa05f4f3a>] ocfs2_prepare_dir_for_insert+0x13a/0x890 [ocfs2]
#     [203748.712227]  [<ffffffffa05f442e>] ? ocfs2_check_dir_for_entry+0x8e/0x140 [ocfs2]
#     [203748.712737]  [<ffffffffa061b2f2>] ocfs2_mknod+0x4b2/0x1370 [ocfs2]
#     [203748.713003]  [<ffffffffa061c385>] ocfs2_create+0x65/0x170 [ocfs2]
#     [203748.713263]  [<ffffffff8121714b>] vfs_create+0xdb/0x150
#     [203748.713518]  [<ffffffff8121b225>] do_last+0x815/0x1210
#     [203748.713772]  [<ffffffff812192e9>] ? path_init+0xb9/0x450
#     [203748.714123]  [<ffffffff8121bca0>] path_openat+0x80/0x600
#     [203748.714378]  [<ffffffff811bcd45>] ? handle_pte_fault+0xd15/0x1620
#     [203748.714634]  [<ffffffff8121d7ba>] do_filp_open+0x3a/0xb0
#     [203748.714888]  [<ffffffff8122a767>] ? __alloc_fd+0xa7/0x130
#     [203748.715143]  [<ffffffff81209ffc>] do_sys_open+0x12c/0x220
#     [203748.715403]  [<ffffffff81026ddb>] ? syscall_trace_enter_phase1+0x11b/0x180
#     [203748.715668]  [<ffffffff816f0c9f>] ? system_call_after_swapgs+0xe9/0x190
#     [203748.715928]  [<ffffffff8120a10e>] SyS_open+0x1e/0x20
#     [203748.716184]  [<ffffffff816f0d5e>] system_call_fastpath+0x18/0xd7
#     [203748.716440] Code: 00 00 48 8b 7b 08 48 83 c3 10 45 89 f8 44 89 e1 44 89 f2 4c 89 ee e8 07 06 11 e1 48 8b 03 48 85 c0 75 df 8b 5d c8 e9 4d fa ff ff <0f> 0b 48 8b 7d a0 e8 dc c6 06 00 48 b8 00 00 00 00 00 00 00 10
#     [203748.717505] RIP  [<ffffffffa05e9f09>] ocfs2_read_blocks+0x669/0x7f0 [ocfs2]
#     [203748.717775]  RSP <ffff88006ff4b818>
#     
#     Joesph ever reported a similar panic.
#     Link: https://oss.oracle.com/pipermail/ocfs2-devel/2013-May/008931.html
#     
#     Link: http://lkml.kernel.org/r/20180912063207.29484-1-junxiao.bi@oracle.com
#     Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
#     Cc: Joseph Qi <jiangqi903@gmail.com>
#     Cc: Mark Fasheh <mark@fasheh.com>
#     Cc: Joel Becker <jlbec@evilplan.org>
#     Cc: Changwei Ge <ge.changwei@h3c.com>
#     Cc: <stable@vger.kernel.org>
#     Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
#     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version
# < git log --format=%s --max-count=1 234b69e3e089d850a98e7b3145bd00e9b52b1111
# < make -s -j 48 ARCH=arm O=/kisskb/build/linus_zeus_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  zeus_defconfig
# make -s -j 48 ARCH=arm O=/kisskb/build/linus_zeus_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  
<stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:185:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:341:21: note: 'pdeo' was declared here
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2511:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1833:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery':
/kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon':
/kisskb/src/net/mac80211/mlme.c:1511:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c:1468:6: note: 'pwr_level_cisco' was declared here
Completed OK
# rm -rf /kisskb/build/linus_zeus_defconfig_arm
# Build took: 0:00:44.047423