[LU-2978] unable to handle kernel NULL pointer dereference at ll_readahead

• Status: Resolved
• Project: Lustre
• Type: Bug
• Priority: Minor
• Reporter: Shuichi Ihara (Inactive)
• Assignee: Bob Glossman (Inactive)
• Resolution: Duplicate

Environment

CentOS5.8, Lustre-1.8.8-wc1 and SLES11SP1(client)

• Severity: 3

Description

We got the following error messages on the clients. Would you please advise us what happens?

[7823336.242007] BUG: unable to handle kernel NULL pointer dereference at (null)
[7823336.242021] IP: [<ffffffffa0b54e8a>] ll_readahead+0x4a/0x1e00 [lustre]
[7823336.242051] PGD 1c7bbfd067 PUD 1d0d456067 PMD 0
[7823336.242056] Oops: 0000 [#1] SMP
[7823336.242060] last sysfs file: /sys/module/qlgc_srp/parameters/log_level
[7823336.242065] CPU 14
[7823336.242067] Modules linked in: mgc(N) lustre(N) lov(N) mdc(N) lquota(N) osc(N) ko2iblnd(N) ptlrpc(N) obdclass(N) lnet(N) lvfs(N) libcfs(N) qlgc_srp(N) rdma_ucm rdma_cm iw_cm ib_addr ib_ipoib ib_cm ipv6 ib_usa(N) ib_sa ib_uverbs ib_umad kcopy(N) mlx4_ib mlx4_core ib_mthca cpufreq_conservative cpufreq_userspace cpufreq_powersave powernow_k8 loop dm_mod ide_pci_generic atiixp ide_core rfkill ata_generic i2c_piix4 led_class tpm_tis pcspkr ib_qib(N) serio_raw pata_atiixp ahci tpm wmi tpm_bios libata ib_mad joydev i2c_core ib_core thermal button processor thermal_sys hwmon 8021q nfs ext2 crc_t10dif scsi_tgt exportfs auth_rpcgss fscache garp stp llc af_packet ipmi_poweroff ipmi_watchdog ipmi_devintf ipmi_si ipmi_msghandler autofs4 forcedeth pcnet32 nfs_acl lockd sunrpc e100 mii megaraid_sas mpt2sas raid_class scsi_transport_sas scsi_mod e1000e e1000 cxgb3 usbhid hid ixgbe bnx2x crc32c libcrc32c mdio bnx2 tg3 ext3 mbcache jbd uhci_hcd ohci_hcd ehci_hcd igb usbcore dca rtc_cmos rtc_core rtc_lib
[7823336.242151] Supported: No, Unsupported modules are loaded
[7823336.242157] Pid: 17724, comm: psiblast Tainted: G   M    W N  2.6.32.12-0.7-default #1 AR585 F1
[7823336.242161] RIP: 0010:[<ffffffffa0b54e8a>]  [<ffffffffa0b54e8a>] ll_readahead+0x4a/0x1e00 [lustre]
[7823336.242174] RSP: 0000:ffff88065a745a38  EFLAGS: 00010246
[7823336.242177] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff880ba1dfaa00
[7823336.242180] RDX: 0000000000000000 RSI: ffff881014ed8600 RDI: ffff881ee44695c0
[7823336.242184] RBP: ffff881ee44695c0 R08: 0000000000000000 R09: 0000000000000001
[7823336.242187] R10: 0000000000000000 R11: ffff880ba1dfaa00 R12: ffffea005602d898
[7823336.242191] R13: ffff881ee44695c0 R14: ffff880960b267b0 R15: ffff8810157c4000
[7823336.242195] FS:  00002ae46f14d710(0000) GS:ffff880836480000(0000) knlGS:0000000055eaa150
[7823336.242199] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[7823336.242202] CR2: 0000000000000000 CR3: 0000001e96bac000 CR4: 00000000000006e0
[7823336.242206] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[7823336.242209] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[7823336.242213] Process psiblast (pid: 17724, threadinfo ffff88065a744000, task ffff8800471be5c0)
[7823336.242217] Stack:
[7823336.242219]  ffff880c00000000 0000000000000000 ffff880c09207ce8 ffff880c09207c80
[7823336.242223] <0> 5a5a5a5a5a5a5a5a ffff880ba1dfaa00 0000000000000001 ffff880960b267f8
[7823336.242228] <0> ffff881014513000 ffff880cf6a37240 ffff880e26985e80 ffff880960b26830
[7823336.242234] Call Trace:
[7823336.242280]  [<ffffffffa0b57e83>] ll_readpage+0x1243/0x18a0 [lustre]
[7823336.242297]  [<ffffffff810b4fd1>] filemap_fault+0x241/0x3d0
[7823336.242313]  [<ffffffffa0b65bd7>] ll_fault+0x3b7/0xdd0 [lustre]
[7823336.242335]  [<ffffffff810cd9f7>] __do_fault+0x57/0x520
[7823336.242343]  [<ffffffff810d2349>] handle_mm_fault+0x199/0x430
[7823336.242351]  [<ffffffff813999cf>] do_page_fault+0x1bf/0x3e0
[7823336.242358]  [<ffffffff813972ef>] page_fault+0x1f/0x30
[7823336.242366]  [<0000000000b916e1>] 0xb916e1
[7823336.242369] Code: a0 00 00 00 48 89 94 24 98 00 00 00 48 89 8c 24 90 00 00 00 74 0d 80 3d 44 0a c7 ff 00 0f 88 9e 04 00 00 48 8b 84 24 98 00 00 00 <48> 8b 00 48 89 84 24 b0 00 00 00 4c 8b a0 f0 fe ff ff 4c 89 e7
[7823336.242395] RIP  [<ffffffffa0b54e8a>] ll_readahead+0x4a/0x1e00 [lustre]
[7823336.242405]  RSP <ffff88065a745a38>
[7823336.242407] CR2: 0000000000000000
[7823336.242992] ---[ end trace 77202dc4e7188011 ]---

Comments

[Shuichi Ihara (Inactive)]

This is very similar to LU-1878, is that same problem?

[Peter Jones]

Bob

Could you please comment on this one?

Thanks

Peter

[Bob Glossman (Inactive)]

This looks very much like a dup of LU-1878 to me. The fix http://review.whamcloud.com/#change,4026 for that bug has been waiting for replies to review comments for a while.

[John Fuchs-Chesney (Inactive)]

Closing as a duplicate. Many changes in this area of code make this ticket redundant now.

~ jfc.