[Ocfs2-devel] Another null poiner issue reports, is the code modified ok? thanks a lot
Guozhonghua
guozhonghua at h3c.com
Sun Jul 28 20:02:43 PDT 2013
Hi,
There is an another null pointer issue, sometime may cause the host node blocked.
I don't know whether had it been fixed and not applied into main line.
And I diff the code from Linux kernel 3.10 with 3.2.40, and it is in the code.
Is it correct to fix this issue?
The code diff is as below, I think sc_put should after kernel_sock_shutdown, the pointer should valid before shutdown.
diff -pc tcp.c diff/tcp.c
*** tcp.c 2013-04-26 03:25:51.000000000 +0800
--- diff/tcp.c 2013-07-29 10:32:46.878105443 +0800
*************** static void o2net_shutdown_sc(struct wor
*** 741,748 ****
* races with pending sc work structs are harmless */
del_timer_sync(&sc->sc_idle_timeout);
o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
sc_put(sc);
- kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
}
/* not fatal so failed connects before the other guy has our
--- 741,753 ----
* races with pending sc work structs are harmless */
del_timer_sync(&sc->sc_idle_timeout);
o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
+
+ /* Avoiding null pointer */
+ if (sc && sc->sc_sock) {
+ kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
+ }
+
sc_put(sc);
}
/* not fatal so failed connects before the other guy has our
The syslog info is as below:
Jul 27 18:06:44 server19 kernel: [ 9866.275007] o2dlm: Leaving domain 6BD5E5E544114F5C835FCC7614C34DD7
Jul 27 18:06:46 server19 kernel: [ 9868.166118] o2net: No longer connected to node Server20 (num 1) at 192.168.20.20:7100
Jul 27 18:06:46 server19 kernel: [ 9868.166236] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
Jul 27 18:06:46 server19 kernel: [ 9868.166250] IP: [<ffffffff81526de9>] kernel_sock_shutdown+0x9/0x20
Jul 27 18:06:46 server19 kernel: [ 9868.166264] PGD 0
Jul 27 18:06:46 server19 kernel: [ 9868.166269] Oops: 0000 [#1] SMP
Jul 27 18:06:46 server19 kernel: [ 9868.166276] CPU 0
Jul 27 18:06:46 server19 kernel: [ 9868.166280] Modules linked in: ocfs2(O) quota_tree ocfs2_dlmfs(O) ocfs2_stack_o2cb(O) ocfs2_dlm(O) ocfs2_nodemanager(O) ocfs2_stackglue(O) configfs joydev usbhid hid ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables drbd lru_cache 8021q garp stp kvm_intel kvm openvswitch_mod(O) vesafb ib_iser nfsd nfs lockd rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi fscache auth_rpcgss nfs_acl sunrpc dm_round_robin psmouse serio_raw hpilo sb_edac edac_core mac_hid acpi_power_meter ioatdma dca video dm_multipath lp parport lpfc scsi_transport_fc hpsa be2net scsi_tgt [last unloaded: configfs]
Jul 27 18:06:46 server19 kernel: [ 9868.166389]
Jul 27 18:06:46 server19 kernel: [ 9868.166395] Pid: 8306, comm: kworker/u:3 Tainted: G W O 3.2.0-23-generic #36-Ubuntu HP ProLiant BL460c Gen8
Jul 27 18:06:46 server19 kernel: [ 9868.166407] RIP: 0010:[<ffffffff81526de9>] [<ffffffff81526de9>] kernel_sock_shutdown+0x9/0x20
Jul 27 18:06:46 server19 kernel: [ 9868.166418] RSP: 0018:ffff880809a23d90 EFLAGS: 00010286
Jul 27 18:06:46 server19 kernel: [ 9868.166424] RAX: 0000000000000001 RBX: ffff880fdc9dcc58 RCX: 000000018020000a
Jul 27 18:06:46 server19 kernel: [ 9868.166430] RDX: 000000018020000b RSI: 0000000000000002 RDI: 0000000000000000
Jul 27 18:06:46 server19 kernel: [ 9868.166436] RBP: ffff880809a23d90 R08: 0000000000000001 R09: 0000000000000000
Jul 27 18:06:46 server19 kernel: [ 9868.166443] R10: f7c2fe93f8d0f203 R11: 000000001414a801 R12: ffff880fdc9dcc00
Jul 27 18:06:46 server19 kernel: [ 9868.166449] R13: ffffffffa03577c0 R14: ffff8808047ba1c0 R15: ffff8808047ba328
Jul 27 18:06:46 server19 kernel: [ 9868.166456] FS: 0000000000000000(0000) GS:ffff88081fa00000(0000) knlGS:0000000000000000
Jul 27 18:06:46 server19 kernel: [ 9868.166464] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jul 27 18:06:46 server19 kernel: [ 9868.166470] CR2: 0000000000000028 CR3: 0000000001c05000 CR4: 00000000000406f0
Jul 27 18:06:46 server19 kernel: [ 9868.166477] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jul 27 18:06:46 server19 kernel: [ 9868.166483] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jul 27 18:06:46 server19 kernel: [ 9868.166490] Process kworker/u:3 (pid: 8306, threadinfo ffff880809a22000, task ffff880807e25bc0)
Jul 27 18:06:46 server19 kernel: [ 9868.166497] Stack:
Jul 27 18:06:46 server19 kernel: [ 9868.166501] ffff880809a23e00 ffffffffa034c2ab ffff880809a23dd0 ffff88100aa31800
Jul 27 18:06:46 server19 kernel: [ 9868.166516] 0000000000000000 ffff88100aa31800 ffffffff81e534c0 ffffffffa034d480
Jul 27 18:06:46 server19 kernel: [ 9868.166528] ffff880809a23e00 ffff880fdc9dcc58 ffff88080b378b00 ffff88100aa31800
Jul 27 18:06:46 server19 kernel: [ 9868.166541] Call Trace:
Jul 27 18:06:46 server19 kernel: [ 9868.166559] [<ffffffffa034c2ab>] o2net_shutdown_sc+0x11b/0x1a0 [ocfs2_nodemanager]
Jul 27 18:06:46 server19 kernel: [ 9868.166573] [<ffffffffa034d480>] ? sc_alloc+0x2a0/0x2a0 [ocfs2_nodemanager]
Jul 27 18:06:46 server19 kernel: [ 9868.166585] [<ffffffffa034c190>] ? o2net_sc_connect_completed+0xb0/0xb0 [ocfs2_nodemanager]
Jul 27 18:06:46 server19 kernel: [ 9868.166600] [<ffffffff81084e2a>] process_one_work+0x11a/0x480
Jul 27 18:06:46 server19 kernel: [ 9868.166609] [<ffffffff81085bd4>] worker_thread+0x164/0x370
Jul 27 18:06:46 server19 kernel: [ 9868.166619] [<ffffffff81085a70>] ? manage_workers.isra.29+0x130/0x130
Jul 27 18:06:46 server19 kernel: [ 9868.166629] [<ffffffff8108a42c>] kthread+0x8c/0xa0
Jul 27 18:06:46 server19 kernel: [ 9868.166639] [<ffffffff81666bf4>] kernel_thread_helper+0x4/0x10
Jul 27 18:06:46 server19 kernel: [ 9868.166648] [<ffffffff8108a3a0>] ? flush_kthread_worker+0xa0/0xa0
Jul 27 18:06:46 server19 kernel: [ 9868.166656] [<ffffffff81666bf0>] ? gs_change+0x13/0x13
Jul 27 18:06:46 server19 kernel: [ 9868.166661] Code: ff ff 48 8b 47 28 ff 50 48 4c 89 a3 48 e0 ff ff 48 8b 5d f0 4c 8b 65 f8 c9 c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 66 66 66 66 90 <48> 8b 47 28 ff 50 60 5d c3 66 66 66 66 66 2e 0f 1f 84 00 00 00
Jul 27 18:06:46 server19 kernel: [ 9868.166726] RIP [<ffffffff81526de9>] kernel_sock_shutdown+0x9/0x20
Jul 27 18:06:46 server19 kernel: [ 9868.166734] RSP <ffff880809a23d90>
Jul 27 18:06:46 server19 kernel: [ 9868.166738] CR2: 0000000000000028
Jul 27 18:07:46 server19 kernel: [ 9868.178199] ---[ end trace a7919e7f17c0a727 ]---
Jul 27 18:07:46 server19 kernel: [ 9868.178248] BUG: unable to handle kernel paging request at fffffffffffffff8
Jul 27 18:07:46 server19 kernel: [ 9868.178257] IP: [<ffffffff8108a8c1>] kthread_data+0x11/0x20
Jul 27 18:07:46 server19 kernel: [ 9868.178267] PGD 1c07067 PUD 1c08067 PMD 0
Jul 27 18:07:46 server19 kernel: [ 9868.178275] Oops: 0000 [#2] SMP
Jul 27 18:07:46 server19 kernel: [ 9868.178280] CPU 0
Jul 27 18:07:46 server19 kernel: [ 9868.178283] Modules linked in: ocfs2(O) quota_tree ocfs2_dlmfs(O) ocfs2_stack_o2cb(O) ocfs2_dlm(O) ocfs2_nodemanager(O) ocfs2_stackglue(O) configfs joydev usbhid hid ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables drbd lru_cache 8021q garp stp kvm_intel kvm openvswitch_mod(O) vesafb ib_iser nfsd nfs lockd rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi fscache auth_rpcgss nfs_acl sunrpc dm_round_robin psmouse serio_raw hpilo sb_edac edac_core mac_hid acpi_power_meter ioatdma dca video dm_multipath lp parport lpfc scsi_transport_fc hpsa be2net scsi_tgt [last unloaded: configfs]
Jul 27 18:07:46 server19 kernel: [ 9868.178378]
Jul 27 18:07:46 server19 kernel: [ 9868.178383] Pid: 8306, comm: kworker/u:3 Tainted: G D W O 3.2.0-23-generic #36-Ubuntu HP ProLiant BL460c Gen8
Jul 27 18:07:46 server19 kernel: [ 9868.178394] RIP: 0010:[<ffffffff8108a8c1>] [<ffffffff8108a8c1>] kthread_data+0x11/0x20
Jul 27 18:07:46 server19 kernel: [ 9868.178404] RSP: 0018:ffff880809a239e0 EFLAGS: 00010096
Jul 27 18:07:46 server19 kernel: [ 9868.178410] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
Jul 27 18:07:46 server19 kernel: [ 9868.178416] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880807e25bc0
Jul 27 18:07:46 server19 kernel: [ 9868.178423] RBP: ffff880809a239f8 R08: 0000000000989680 R09: 0000000000000000
Jul 27 18:07:46 server19 kernel: [ 9868.178429] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
Jul 27 18:07:46 server19 kernel: [ 9868.178435] R13: ffff880807e25f88 R14: 0000000000000000 R15: 0000000000000246
Jul 27 18:07:46 server19 kernel: [ 9868.178442] FS: 0000000000000000(0000) GS:ffff88081fa00000(0000) knlGS:0000000000000000
Jul 27 18:07:46 server19 kernel: [ 9868.178450] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jul 27 18:07:46 server19 kernel: [ 9868.178456] CR2: fffffffffffffff8 CR3: 0000000001c05000 CR4: 00000000000406f0
Jul 27 18:07:46 server19 kernel: [ 9868.178462] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jul 27 18:07:46 server19 kernel: [ 9868.178468] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jul 27 18:07:46 server19 kernel: [ 9868.178475] Process kworker/u:3 (pid: 8306, threadinfo ffff880809a22000, task ffff880807e25bc0)
Jul 27 18:07:46 server19 kernel: [ 9868.178482] Stack:
Jul 27 18:07:46 server19 kernel: [ 9868.178485] ffffffff81086135 ffff880809a239f8 ffff88081fa13780 ffff880809a23a78
Jul 27 18:07:46 server19 kernel: [ 9868.178499] ffffffff8165a117 ffff880809a23a38 ffff880807e25bc0 ffff880809a23fd8
Jul 27 18:07:46 server19 kernel: [ 9868.178511] ffff880809a23fd8 ffff880809a23fd8 0000000000013780 ffff880809a23a68
Jul 27 18:07:46 server19 kernel: [ 9868.178524] Call Trace:
Jul 27 18:07:46 server19 kernel: [ 9868.178533] [<ffffffff81086135>] ? wq_worker_sleeping+0x15/0xa0
Jul 27 18:07:46 server19 kernel: [ 9868.178544] [<ffffffff8165a117>] __schedule+0x5d7/0x6f0
Jul 27 18:07:46 server19 kernel: [ 9868.178552] [<ffffffff8165a55f>] schedule+0x3f/0x60
Jul 27 18:07:46 server19 kernel: [ 9868.178562] [<ffffffff8106bafb>] do_exit+0x26b/0x420
Jul 27 18:07:46 server19 kernel: [ 9868.178572] [<ffffffff8165d620>] oops_end+0xb0/0xf0
Jul 27 18:07:46 server19 kernel: [ 9868.178581] [<ffffffff81642ebd>] no_context+0x150/0x15d
Jul 27 18:07:46 server19 kernel: [ 9868.178589] [<ffffffff81643093>] __bad_area_nosemaphore+0x1c9/0x1e8
Jul 27 18:07:46 server19 kernel: [ 9868.178598] [<ffffffff816430c5>] bad_area_nosemaphore+0x13/0x15
Jul 27 18:07:46 server19 kernel: [ 9868.178607] [<ffffffff81660276>] do_page_fault+0x426/0x520
Jul 27 18:07:46 server19 kernel: [ 9868.178615] [<ffffffff81526e93>] ? sock_destroy_inode+0x33/0x40
Jul 27 18:07:46 server19 kernel: [ 9868.178626] [<ffffffff8119235c>] ? destroy_inode+0x3c/0x70
Jul 27 18:07:46 server19 kernel: [ 9868.178638] [<ffffffffa0349a50>] ? o2net_sc_queue_work+0x50/0x50 [ocfs2_nodemanager]
Jul 27 18:07:46 server19 kernel: [ 9868.178651] [<ffffffffa0349ab9>] ? sc_kref_release+0x69/0x100 [ocfs2_nodemanager]
Jul 27 18:07:46 server19 kernel: [ 9868.178664] [<ffffffff811620d4>] ? kfree+0x114/0x140
Jul 27 18:07:46 server19 kernel: [ 9868.178672] [<ffffffff8165cbf5>] page_fault+0x25/0x30
Jul 27 18:07:46 server19 kernel: [ 9868.178680] [<ffffffff81526de9>] ? kernel_sock_shutdown+0x9/0x20
Jul 27 18:07:46 server19 kernel: [ 9868.178692] [<ffffffffa034c2ab>] o2net_shutdown_sc+0x11b/0x1a0 [ocfs2_nodemanager]
Jul 27 18:07:46 server19 kernel: [ 9868.178704] [<ffffffffa034d480>] ? sc_alloc+0x2a0/0x2a0 [ocfs2_nodemanager]
Jul 27 18:07:46 server19 kernel: [ 9868.178716] [<ffffffffa034c190>] ? o2net_sc_connect_completed+0xb0/0xb0 [ocfs2_nodemanager]
Jul 27 18:07:46 server19 kernel: [ 9868.178727] [<ffffffff81084e2a>] process_one_work+0x11a/0x480
Jul 27 18:07:46 server19 kernel: [ 9868.178736] [<ffffffff81085bd4>] worker_thread+0x164/0x370
Jul 27 18:07:46 server19 kernel: [ 9868.178745] [<ffffffff81085a70>] ? manage_workers.isra.29+0x130/0x130
Jul 27 18:07:46 server19 kernel: [ 9868.178753] [<ffffffff8108a42c>] kthread+0x8c/0xa0
Jul 27 18:07:46 server19 kernel: [ 9868.178761] [<ffffffff81666bf4>] kernel_thread_helper+0x4/0x10
Jul 27 18:07:46 server19 kernel: [ 9868.178770] [<ffffffff8108a3a0>] ? flush_kthread_worker+0xa0/0xa0
Jul 27 18:07:46 server19 kernel: [ 9868.178778] [<ffffffff81666bf0>] ? gs_change+0x13/0x13
Jul 27 18:07:46 server19 kernel: [ 9868.178783] Code: 41 5f 5d c3 be 3e 01 00 00 48 c7 c7 80 9a a0 81 e8 c5 c8 fd ff e9 74 fe ff ff 55 48 89 e5 66 66 66 66 90 48 8b 87 70 03 00 00 5d <48> 8b 40 f8 c3 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 66 66
Jul 27 18:07:46 server19 kernel: [ 9868.178848] RIP [<ffffffff8108a8c1>] kthread_data+0x11/0x20
Jul 27 18:07:46 server19 kernel: [ 9868.178856] RSP <ffff880809a239e0>
Jul 27 18:07:46 server19 kernel: [ 9868.178860] CR2: fffffffffffffff8
Jul 27 18:07:46 server19 kernel: [ 9868.178865] ---[ end trace a7919e7f17c0a728 ]---
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