[LU-2779] LBUG in discard_cb: !(page->cp_type == CPT_CACHEABLE) || (!PageWriteback(cl_page_vmpage(env, page)))

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.5.0, Lustre 2.4.2
• Affects Version/s: Lustre 2.4.0
• Labels: sequoia topsequoia
• Severity: 3
• Assignee: Jinshan Xiong (Inactive)
• Reporter: Prakash Surya (Inactive)

Description

We hit this on Sequoia during shutdown time, I don't see an existing bug open for this crash either:

2013-02-01 14:35:53.812430 {R4-llnl} [bgqadmin]{5}.3.1: 
2013-02-01 14:35:53.812843 {R4-llnl} [bgqadmin]{5}.3.1: Broadcast message from root@seqio262-ib0
2013-02-01 14:35:53.813165 {R4-llnl} [bgqadmin]{5}.3.1: 	(unknown) at 14:35 ...
2013-02-01 14:35:53.813752 {R4-llnl} [bgqadmin]{5}.3.1: The system is going down for halt NOW!
2013-02-01 14:35:53.814093 {R4-llnl} [bgqadmin]{5}.2.3: Stopping Common I/O Services: LustreError: 4653:0:(cl_lock.c:1967:discard_cb()) ASSERTION( (!(page->cp_type == CPT_CACHEABLE) || (!PageWriteback(cl_page_vmpage(env, page)))) ) failed: 
2013-02-01 14:35:53.814429 {R4-llnl} [bgqadmin]{5}.2.3: LustreError: 4653:0:(cl_lock.c:1967:discard_cb()) LBUG
2013-02-01 14:35:53.814746 {R4-llnl} [bgqadmin]{5}.2.3: Call Trace:
2013-02-01 14:35:53.815076 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392b40] [c000000000008d1c] .show_stack+0x7c/0x184 (unreliable)
2013-02-01 14:35:53.815397 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392bf0] [8000000000ab0c88] .libcfs_debug_dumpstack+0xd8/0x150 [libcfs]
2013-02-01 14:35:53.815717 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392ca0] [8000000000ab1450] .lbug_with_loc+0x50/0xc0 [libcfs]
2013-02-01 14:35:53.816042 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392d30] [80000000024f15f8] .discard_cb+0x238/0x240 [obdclass]
2013-02-01 14:35:53.816392 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392dd0] [80000000024ecadc] .cl_page_gang_lookup+0x26c/0x600 [obdclass]
2013-02-01 14:35:53.816732 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392ef0] [80000000024f11f8] .cl_lock_discard_pages+0x188/0x2c0 [obdclass]
2013-02-01 14:35:53.817047 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392fa0] [80000000046aa390] .osc_lock_flush+0x290/0x4a0 [osc]
2013-02-01 14:35:53.817363 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393090] [80000000046aa6dc] .osc_lock_cancel+0x13c/0x2c0 [osc]
2013-02-01 14:35:53.817877 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393160] [80000000024eda90] .cl_lock_cancel0+0xd0/0x2b0 [obdclass]
2013-02-01 14:35:53.818248 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393220] [80000000024f09f8] .cl_lock_hold_release+0x258/0x450 [obdclass]
2013-02-01 14:35:53.818565 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3932f0] [80000000024f36fc] .cl_lock_unhold+0x8c/0x270 [obdclass]
2013-02-01 14:35:53.818901 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3933c0] [800000000513e5b4] .lov_sublock_release+0x244/0x370 [lov]
2013-02-01 14:35:53.819221 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393480] [8000000005141f68] .lov_lock_enqueue+0x388/0xb20 [lov]
2013-02-01 14:35:53.819535 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3935c0] [80000000024f4d88] .cl_enqueue_try+0x1d8/0x510 [obdclass]
2013-02-01 14:35:53.819908 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3936d0] [80000000024f6d88] .cl_enqueue_locked+0xa8/0x2c0 [obdclass]
2013-02-01 14:35:53.820387 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393780] [80000000024f72b0] .cl_lock_request+0xe0/0x370 [obdclass]
2013-02-01 14:35:53.820707 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393850] [800000000695efb4] .cl_glimpse_lock+0x2b4/0x640 [lustre]
2013-02-01 14:35:53.821021 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393940] [800000000695f538] .cl_glimpse_size0+0x1f8/0x270 [lustre]
2013-02-01 14:35:53.821337 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393a10] [80000000068f1510] .ll_inode_revalidate_it+0x220/0x2c0 [lustre]
2013-02-01 14:35:53.821652 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393ad0] [80000000068f15f0] .ll_getattr_it+0x40/0x180 [lustre]
2013-02-01 14:35:53.821966 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393b70] [80000000068f1774] .ll_getattr+0x44/0x60 [lustre]
2013-02-01 14:35:53.822282 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393c20] [c0000000000d57d8] .vfs_getattr+0x38/0x60
2013-02-01 14:35:53.822595 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393c90] [c0000000000d5e4c] .vfs_fstatat+0x78/0xa8
2013-02-01 14:35:53.822909 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393d30] [c0000000000d5f00] .SyS_newfstatat+0x2c/0x58
2013-02-01 14:35:53.823222 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393e30] [c000000000000580] syscall_exit+0x0/0x2c
2013-02-01 14:35:53.823534 {R4-llnl} [bgqadmin]{5}.2.3: Kernel panic - not syncing: LBUG
2013-02-01 14:35:53.823844 {R4-llnl} [bgqadmin]{5}.2.3: Call Trace:
2013-02-01 14:35:53.824153 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392b60] [c000000000008d1c] .show_stack+0x7c/0x184 (unreliable)
2013-02-01 14:35:53.824466 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392c10] [c000000000431ef4] .panic+0x80/0x1ac
2013-02-01 14:35:53.824776 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392ca0] [8000000000ab14b0] .lbug_with_loc+0xb0/0xc0 [libcfs]
2013-02-01 14:35:53.825089 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392d30] [80000000024f15f8] .discard_cb+0x238/0x240 [obdclass]
2013-02-01 14:35:53.825401 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392dd0] [80000000024ecadc] .cl_page_gang_lookup+0x26c/0x600 [obdclass]
2013-02-01 14:35:53.825721 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392ef0] [80000000024f11f8] .cl_lock_discard_pages+0x188/0x2c0 [obdclass]
2013-02-01 14:35:53.826045 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e392fa0] [80000000046aa390] .osc_lock_flush+0x290/0x4a0 [osc]
2013-02-01 14:35:53.826358 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393090] [80000000046aa6dc] .osc_lock_cancel+0x13c/0x2c0 [osc]
2013-02-01 14:35:53.826670 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393160] [80000000024eda90] .cl_lock_cancel0+0xd0/0x2b0 [obdclass]
2013-02-01 14:35:53.826982 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393220] [80000000024f09f8] .cl_lock_hold_release+0x258/0x450 [obdclass]
2013-02-01 14:35:53.827295 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3932f0] [80000000024f36fc] .cl_lock_unhold+0x8c/0x270 [obdclass]
2013-02-01 14:35:53.827608 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3933c0] [800000000513e5b4] .lov_sublock_release+0x244/0x370 [lov]
2013-02-01 14:35:53.827920 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393480] [8000000005141f68] .lov_lock_enqueue+0x388/0xb20 [lov]
2013-02-01 14:35:53.828232 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3935c0] [80000000024f4d88] .cl_enqueue_try+0x1d8/0x510 [obdclass]
2013-02-01 14:35:53.828649 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e3936d0] [80000000024f6d88] .cl_enqueue_locked+0xa8/0x2c0 [obdclass]
2013-02-01 14:35:53.829092 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393780] [80000000024f72b0] .cl_lock_request+0xe0/0x370 [obdclass]
2013-02-01 14:35:53.829361 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393850] [800000000695efb4] .cl_glimpse_lock+0x2b4/0x640 [lustre]
2013-02-01 14:35:53.829629 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393940] [800000000695f538] .cl_glimpse_size0+0x1f8/0x270 [lustre]
2013-02-01 14:35:53.829892 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393a10] [80000000068f1510] .ll_inode_revalidate_it+0x220/0x2c0 [lustre]
2013-02-01 14:35:53.830155 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393ad0] [80000000068f15f0] .ll_getattr_it+0x40/0x180 [lustre]
2013-02-01 14:35:53.830420 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393b70] [80000000068f1774] .ll_getattr+0x44/0x60 [lustre]
2013-02-01 14:35:53.830686 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393c20] [c0000000000d57d8] .vfs_getattr+0x38/0x60
2013-02-01 14:35:53.830952 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393c90] [c0000000000d5e4c] .vfs_fstatat+0x78/0xa8
2013-02-01 14:35:53.831217 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393d30] [c0000000000d5f00] .SyS_newfstatat+0x2c/0x58
2013-02-01 14:35:53.831483 {R4-llnl} [bgqadmin]{5}.2.3: [c00000038e393e30] [c000000000000580] syscall_exit+0x0/0x2c

Issue Links

• duplicates: LU-2683 Client deadlock in cl_lock_mutex_get
• is duplicated by: LU-4581 ASSERTION( (!(page->cp_type == CPT_CACHEABLE) || (!PageWriteback(cl_page_vmpage(env, page)))) ) failed:

Comments

[Jinshan Xiong (Inactive)]

indeed. patch set 2 allows the interrupt by setting interruption callback to LWI_ON_SIGNAL_NOOP. In that case, it makes sense to upgrade to patch set 4.

[Christopher Morrone (Inactive)]

But the fix looks different. Patch set 4 changes the LWI_INTR interrupt handler from LWI_ON_SIGNAL_NOOP to NULL, and does nothing else. Patch set 2 did not do that. Instead the only significant change in patch set 2 was the removal of the KLASSERT.

I'm missing how those two things are equivalent.

[Jinshan Xiong (Inactive)]

The reason why this patch was made is that OSC has to wait for the IO RPC to finish anyway, no matter how much time it will need; otherwise it will hit the assertion in discard_cb(). If the OST is in recovery, it may take really long time for that OST to finish the RPC.

[Jinshan Xiong (Inactive)]

Patch set 2 has more debug information. The real fix is the same.

[Christopher Morrone (Inactive)]

Patch set 2.