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Date: Sun, 8 Jan 2012 22:06:41 +0800 From: Wu Fengguang <wfg@...ux.intel.com> To: Yongqiang Yang <xiaoqiangnk@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org Subject: Re: 3.2.0-rc5 NULL dereference BUG On Thu, Jan 05, 2012 at 10:45:09AM +0800, Yongqiang Yang wrote: > On Thu, Jan 5, 2012 at 10:43 AM, Wu Fengguang <fengguang.wu@...el.com> wrote: > > On Thu, Jan 05, 2012 at 10:37:15AM +0800, Yongqiang Yang wrote: > >> On Thu, Jan 5, 2012 at 10:34 AM, Wu Fengguang <fengguang.wu@...el.com> wrote: > >> > Yongqiang, > >> > > >> > I noticed that Linus's master does not contain your initial fix > >> > > >> > ext4: do not reference pa_inode from group_pa > >> > > >> > Is that *replaced* by the patches you mentioned below? > >> nope. They are different stories. [ext4: do not reference pa_inode > >> from group_pa] is merged into Ted's tree and has not been pushed to > >> Linus. You can have a loot at Ted's tree > >> http://git.kernel.org/?p=linux/kernel/git/tytso/ext4.git;a=summary > >> > >> [ext4: do not reference pa_inode from group_pa] is merged after the > >> following patches. > > > > Thanks for the explanation. Is it planned to be pushed before the 3.2 > > release? > I am not sure. I am guessing it will be pushed before 3.2 release:-). This bug appears again in 3.2. I'd recommend to send the patch to -stable once it hits 3.3-rcX. Thanks, Fengguang [ 613.505459] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 [ 613.506004] IP: [<ffffffff81208933>] perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 613.506004] PGD 203e2e067 PUD 203e2d067 PMD 0 [ 613.506004] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 613.506004] CPU 1 [ 613.506004] Modules linked in: [ 613.506004] [ 613.506004] Pid: 4112, comm: flush-8:80 Not tainted 3.2.0 #313 Supermicro X7DW3/X7DWN [ 613.506004] RIP: 0010:[<ffffffff81208933>] [<ffffffff81208933>] perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 613.506004] RSP: 0018:ffff880211981590 EFLAGS: 00010286 [ 613.506004] RAX: ffffe8ffff0091e8 RBX: ffff8801c5517e70 RCX: ffff880211954500 [ 613.506004] RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffffe8ffff0091e8 [ 613.506004] RBP: ffff880211981670 R08: ffff8802119815b0 R09: 0000000000000000 [ 613.506004] R10: ffffe8fffee087b0 R11: ffffffff8121fba3 R12: ffffffff81f62ff8 [ 613.506004] R13: ffff880211981720 R14: ffff8802080ece50 R15: ffff880211981740 [ 613.506004] FS: 0000000000000000(0000) GS:ffff880226000000(0000) knlGS:0000000000000000 [ 613.506004] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 613.506004] CR2: 0000000000000028 CR3: 00000001efa02000 CR4: 00000000000006e0 [ 613.506004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 613.506004] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 613.506004] Process flush-8:80 (pid: 4112, threadinfo ffff880211980000, task ffff880211954520) [ 613.506004] Stack: [ 613.506004] 0000000000000000 0000000000000003 ffff880211981620 ffff8802119815b0 [ 613.506004] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 613.506004] ffff8802119816c0 0000000000000000 0000000000000000 0000000000000000 [ 613.506004] Call Trace: [ 613.506004] [<ffffffff8121d110>] ? ext4_mb_release_group_pa+0x40/0xfe [ 613.506004] [<ffffffff8121d110>] ext4_mb_release_group_pa+0x40/0xfe [ 613.506004] [<ffffffff8121fbe3>] ext4_mb_discard_group_preallocations+0x355/0x3eb [ 613.506004] [<ffffffff81222b32>] ext4_mb_new_blocks+0x2fd/0x422 [ 613.506004] [<ffffffff8121a495>] ext4_ext_map_blocks+0x146f/0x1969 [ 613.506004] [<ffffffff810a3339>] ? local_clock+0x41/0x5a [ 613.506004] [<ffffffff810aec1b>] ? __lock_acquire+0x564/0x932 [ 613.506004] [<ffffffff810aec1b>] ? __lock_acquire+0x564/0x932 [ 613.506004] [<ffffffff811f601b>] ? ext4_map_blocks+0x103/0x221 [ 613.506004] [<ffffffff811f604c>] ext4_map_blocks+0x134/0x221 [ 613.506004] [<ffffffff811f9857>] mpage_da_map_and_submit+0xef/0x404 [ 613.506004] [<ffffffff811fa2cc>] ext4_da_writepages+0x350/0x505 [ 613.506004] [<ffffffff8103c24b>] ? sched_clock+0x9/0xd [ 613.506004] [<ffffffff810ae168>] ? lock_release_holdtime+0xa3/0xac [ 613.506004] [<ffffffff811137b4>] do_writepages+0x24/0x2d [ 613.506004] [<ffffffff811786a5>] writeback_single_inode+0x126/0x2b4 [ 613.506004] [<ffffffff81178f03>] writeback_sb_inodes+0x17f/0x229 [ 613.506004] [<ffffffff81179657>] wb_writeback+0x130/0x23a [ 613.506004] [<ffffffff81179982>] wb_do_writeback+0x8f/0x1b7 [ 613.506004] [<ffffffff81179b5d>] ? bdi_writeback_thread+0xb3/0x215 [ 613.506004] [<ffffffff81179b36>] bdi_writeback_thread+0x8c/0x215 [ 613.506004] [<ffffffff81179aaa>] ? wb_do_writeback+0x1b7/0x1b7 [ 613.506004] [<ffffffff8109db30>] kthread+0x8e/0x96 [ 613.506004] [<ffffffff819ec584>] kernel_thread_helper+0x4/0x10 [ 613.506004] [<ffffffff819e3974>] ? retint_restore_args+0x13/0x13 [ 613.506004] [<ffffffff8109daa2>] ? __init_kthread_worker+0x5b/0x5b [ 613.506004] [<ffffffff819ec580>] ? gs_change+0x13/0x13 [ 613.506004] Code: 89 c2 4c 89 85 38 ff ff ff 48 8d 4d ec 41 0f b7 74 24 48 e8 ed 06 7e 00 4c 8b 85 38 ff ff ff 48 85 c0 74 50 48 8b 93 a0 00 00 00 <48> 8b 52 28 8b 52 10 89 50 0c 48 8b 93 80 00 00 00 48 89 50 10 [ 613.506004] RIP [<ffffffff81208933>] perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 613.876032] RSP <ffff880211981590> [ 613.876032] CR2: 0000000000000028 [ 613.882620] ---[ end trace af3c59e20d0fb446 ]--- [ 613.882624] ------------[ cut here ]------------ [ 613.882630] WARNING: at /c/wfg/linux/kernel/exit.c:898 do_exit+0x67/0x76e() [ 613.882632] Hardware name: X7DW3 [ 613.882633] Modules linked in: [ 613.882636] Pid: 4112, comm: flush-8:80 Tainted: G D 3.2.0 #313 [ 613.882638] Call Trace: [ 613.882643] [<ffffffff8107dca4>] warn_slowpath_common+0x85/0x9d [ 613.882646] [<ffffffff8107f42e>] ? kmsg_dump+0x8a/0x10c [ 613.882649] [<ffffffff8107dcd6>] warn_slowpath_null+0x1a/0x1c [ 613.882651] [<ffffffff81081417>] do_exit+0x67/0x76e [ 613.882653] [<ffffffff8107f49f>] ? kmsg_dump+0xfb/0x10c [ 613.882656] [<ffffffff8107f42e>] ? kmsg_dump+0x8a/0x10c [ 613.882660] [<ffffffff819e4629>] oops_end+0xbe/0xc6 [ 613.882664] [<ffffffff81056e15>] no_context+0x184/0x193 [ 613.882667] [<ffffffff81056fed>] __bad_area_nosemaphore+0x1c9/0x1e9 [ 613.882670] [<ffffffff8103c24b>] ? sched_clock+0x9/0xd [ 613.882674] [<ffffffff810a315b>] ? sched_clock_local+0x12/0x75 [ 613.882677] [<ffffffff81057020>] bad_area_nosemaphore+0x13/0x15 [ 613.882679] [<ffffffff819e69e7>] do_page_fault+0x213/0x431 [ 613.882684] [<ffffffff811084fc>] ? perf_output_begin+0x1c2/0x1f5 [ 613.882686] [<ffffffff8103c1fb>] ? native_sched_clock+0x29/0x70 [ 613.882688] [<ffffffff8103c24b>] ? sched_clock+0x9/0xd [ 613.882693] [<ffffffff8140a92d>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 613.882696] [<ffffffff8121fba3>] ? ext4_mb_discard_group_preallocations+0x315/0x3eb [ 613.882699] [<ffffffff819e3b85>] page_fault+0x25/0x30 [ 613.882702] [<ffffffff8121fba3>] ? ext4_mb_discard_group_preallocations+0x315/0x3eb [ 613.882705] [<ffffffff81208933>] ? perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 613.882708] [<ffffffff8121d110>] ? ext4_mb_release_group_pa+0x40/0xfe [ 613.882710] [<ffffffff8121d110>] ext4_mb_release_group_pa+0x40/0xfe [ 613.882712] [<ffffffff8121fbe3>] ext4_mb_discard_group_preallocations+0x355/0x3eb [ 613.882716] [<ffffffff81222b32>] ext4_mb_new_blocks+0x2fd/0x422 [ 613.882719] [<ffffffff8121a495>] ext4_ext_map_blocks+0x146f/0x1969 [ 613.882721] [<ffffffff810a3339>] ? local_clock+0x41/0x5a [ 613.882725] [<ffffffff810aec1b>] ? __lock_acquire+0x564/0x932 [ 613.882728] [<ffffffff810aec1b>] ? __lock_acquire+0x564/0x932 [ 613.882731] [<ffffffff811f601b>] ? ext4_map_blocks+0x103/0x221 [ 613.882733] [<ffffffff811f604c>] ext4_map_blocks+0x134/0x221 [ 613.882736] [<ffffffff811f9857>] mpage_da_map_and_submit+0xef/0x404 [ 613.882739] [<ffffffff811fa2cc>] ext4_da_writepages+0x350/0x505 [ 613.882741] [<ffffffff8103c24b>] ? sched_clock+0x9/0xd [ 613.882744] [<ffffffff810ae168>] ? lock_release_holdtime+0xa3/0xac [ 613.882747] [<ffffffff811137b4>] do_writepages+0x24/0x2d [ 613.882751] [<ffffffff811786a5>] writeback_single_inode+0x126/0x2b4 [ 613.882753] [<ffffffff81178f03>] writeback_sb_inodes+0x17f/0x229 [ 613.882756] [<ffffffff81179657>] wb_writeback+0x130/0x23a [ 613.882759] [<ffffffff81179982>] wb_do_writeback+0x8f/0x1b7 [ 613.882761] [<ffffffff81179b5d>] ? bdi_writeback_thread+0xb3/0x215 [ 613.882764] [<ffffffff81179b36>] bdi_writeback_thread+0x8c/0x215 [ 613.882767] [<ffffffff81179aaa>] ? wb_do_writeback+0x1b7/0x1b7 [ 613.882769] [<ffffffff8109db30>] kthread+0x8e/0x96 [ 613.882773] [<ffffffff819ec584>] kernel_thread_helper+0x4/0x10 [ 613.882776] [<ffffffff819e3974>] ? retint_restore_args+0x13/0x13 [ 613.882779] [<ffffffff8109daa2>] ? __init_kthread_worker+0x5b/0x5b [ 613.882782] [<ffffffff819ec580>] ? gs_change+0x13/0x13 [ 613.882783] ---[ end trace af3c59e20d0fb447 ]--- [ 613.882796] flush-8:80 used greatest stack depth: 2352 bytes left [ 614.468204] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 [ 614.469003] IP: [<ffffffff81208933>] perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 614.469003] PGD 211942067 PUD 21be9d067 PMD 0 [ 614.469003] Oops: 0000 [#2] SMP DEBUG_PAGEALLOC [ 614.469003] CPU 3 [ 614.469003] Modules linked in: [ 614.469003] [ 614.469003] Pid: 4117, comm: flush-8:160 Tainted: G D W 3.2.0 #313 Supermicro X7DW3/X7DWN [ 614.469003] RIP: 0010:[<ffffffff81208933>] [<ffffffff81208933>] perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 614.469003] RSP: 0018:ffff880211a17590 EFLAGS: 00010286 [ 614.469003] RAX: ffffe8ffff4091e8 RBX: ffff8801c55179d8 RCX: ffff8802119b2200 [ 614.469003] RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffffe8ffff4091e8 [ 614.469003] RBP: ffff880211a17670 R08: ffff880211a175b0 R09: 0000000000000000 [ 614.469003] R10: ffffe8fffee08ff8 R11: ffffffff8121fba3 R12: ffffffff81f62ff8 [ 614.469003] R13: ffff880211a17720 R14: ffff8802080ece50 R15: ffff8801c5478000 [ 614.560062] FS: 0000000000000000(0000) GS:ffff880226400000(0000) knlGS:0000000000000000 [ 614.560062] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 614.560062] CR2: 0000000000000028 CR3: 0000000211945000 CR4: 00000000000006e0 [ 614.560062] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 614.560062] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 614.560062] Process flush-8:160 (pid: 4117, threadinfo ffff880211a16000, task ffff8802119b2290) [ 614.610013] Stack: [ 614.610013] ffff880218a5a020 0000000000000000 ffff8801f88d9858 ffff880211a175b0 [ 614.610013] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 614.610013] ffff880211a176c0 0000000000000000 0000000000000000 0000000000000000 [ 614.610013] Call Trace: [ 614.610013] [<ffffffff8121d110>] ? ext4_mb_release_group_pa+0x40/0xfe [ 614.610013] [<ffffffff8121d110>] ext4_mb_release_group_pa+0x40/0xfe [ 614.610013] [<ffffffff8121fbe3>] ext4_mb_discard_group_preallocations+0x355/0x3eb [ 614.610013] [<ffffffff81222b32>] ext4_mb_new_blocks+0x2fd/0x422 [ 614.610013] [<ffffffff8121a495>] ext4_ext_map_blocks+0x146f/0x1969 [ 614.610013] [<ffffffff81404010>] ? radix_tree_gang_lookup_tag_slot+0x81/0xa2 [ 614.610013] [<ffffffff811f5f5f>] ? ext4_map_blocks+0x47/0x221 [ 614.610013] [<ffffffff811f601b>] ? ext4_map_blocks+0x103/0x221 [ 614.610013] [<ffffffff811f604c>] ext4_map_blocks+0x134/0x221 [ 614.610013] [<ffffffff811f9857>] mpage_da_map_and_submit+0xef/0x404 [ 614.610013] [<ffffffff811fa2cc>] ext4_da_writepages+0x350/0x505 [ 614.610013] [<ffffffff811137b4>] do_writepages+0x24/0x2d [ 614.610013] [<ffffffff811786a5>] writeback_single_inode+0x126/0x2b4 [ 614.610013] [<ffffffff81178f03>] writeback_sb_inodes+0x17f/0x229 [ 614.610013] [<ffffffff81179657>] wb_writeback+0x130/0x23a [ 614.610013] [<ffffffff81179982>] wb_do_writeback+0x8f/0x1b7 [ 614.610013] [<ffffffff81179b5d>] ? bdi_writeback_thread+0xb3/0x215 [ 614.610013] [<ffffffff81179b36>] bdi_writeback_thread+0x8c/0x215 [ 614.610013] [<ffffffff81179aaa>] ? wb_do_writeback+0x1b7/0x1b7 [ 614.610013] [<ffffffff8109db30>] kthread+0x8e/0x96 [ 614.610013] [<ffffffff819ec584>] kernel_thread_helper+0x4/0x10 [ 614.610013] [<ffffffff819e3974>] ? retint_restore_args+0x13/0x13 [ 614.610013] [<ffffffff8109daa2>] ? __init_kthread_worker+0x5b/0x5b [ 614.610013] [<ffffffff819ec580>] ? gs_change+0x13/0x13 [ 614.610013] Code: 89 c2 4c 89 85 38 ff ff ff 48 8d 4d ec 41 0f b7 74 24 48 e8 ed 06 7e 00 4c 8b 85 38 ff ff ff 48 85 c0 74 50 48 8b 93 a0 00 00 00 <48> 8b 52 28 8b 52 10 89 50 0c 48 8b 93 80 00 00 00 48 89 50 10 [ 614.610013] RIP [<ffffffff81208933>] perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 614.610013] RSP <ffff880211a17590> [ 614.610013] CR2: 0000000000000028 [ 614.615263] ---[ end trace af3c59e20d0fb448 ]--- [ 614.615266] ------------[ cut here ]------------ [ 614.615271] WARNING: at /c/wfg/linux/kernel/exit.c:898 do_exit+0x67/0x76e() [ 614.615272] Hardware name: X7DW3 [ 614.615273] Modules linked in: [ 614.615276] Pid: 4117, comm: flush-8:160 Tainted: G D W 3.2.0 #313 [ 614.615278] Call Trace: [ 614.615282] [<ffffffff8107dca4>] warn_slowpath_common+0x85/0x9d [ 614.615285] [<ffffffff8107f42e>] ? kmsg_dump+0x8a/0x10c [ 614.615287] [<ffffffff8107dcd6>] warn_slowpath_null+0x1a/0x1c [ 614.615289] [<ffffffff81081417>] do_exit+0x67/0x76e [ 614.615292] [<ffffffff8107f49f>] ? kmsg_dump+0xfb/0x10c [ 614.615294] [<ffffffff8107f42e>] ? kmsg_dump+0x8a/0x10c [ 614.615298] [<ffffffff819e4629>] oops_end+0xbe/0xc6 [ 614.615302] [<ffffffff81056e15>] no_context+0x184/0x193 [ 614.615305] [<ffffffff81056fed>] __bad_area_nosemaphore+0x1c9/0x1e9 [ 614.615307] [<ffffffff81057020>] bad_area_nosemaphore+0x13/0x15 [ 614.615310] [<ffffffff819e69e7>] do_page_fault+0x213/0x431 [ 614.615314] [<ffffffff8110833a>] ? perf_output_copy+0x74/0x74 [ 614.615318] [<ffffffff8140a92d>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 614.615321] [<ffffffff8121fba3>] ? ext4_mb_discard_group_preallocations+0x315/0x3eb [ 614.615323] [<ffffffff819e3b85>] page_fault+0x25/0x30 [ 614.615326] [<ffffffff8121fba3>] ? ext4_mb_discard_group_preallocations+0x315/0x3eb [ 614.615328] [<ffffffff81208933>] ? perf_trace_ext4_mb_release_group_pa+0x81/0xd6 [ 614.615331] [<ffffffff8121d110>] ? ext4_mb_release_group_pa+0x40/0xfe [ 614.615333] [<ffffffff8121d110>] ext4_mb_release_group_pa+0x40/0xfe [ 614.615336] [<ffffffff8121fbe3>] ext4_mb_discard_group_preallocations+0x355/0x3eb [ 614.615339] [<ffffffff81222b32>] ext4_mb_new_blocks+0x2fd/0x422 [ 614.615342] [<ffffffff8121a495>] ext4_ext_map_blocks+0x146f/0x1969 [ 614.615346] [<ffffffff81404010>] ? radix_tree_gang_lookup_tag_slot+0x81/0xa2 [ 614.615348] [<ffffffff811f5f5f>] ? ext4_map_blocks+0x47/0x221 [ 614.615350] [<ffffffff811f601b>] ? ext4_map_blocks+0x103/0x221 [ 614.615353] [<ffffffff811f604c>] ext4_map_blocks+0x134/0x221 [ 614.615355] [<ffffffff811f9857>] mpage_da_map_and_submit+0xef/0x404 [ 614.615358] [<ffffffff811fa2cc>] ext4_da_writepages+0x350/0x505 [ 614.615361] [<ffffffff811137b4>] do_writepages+0x24/0x2d [ 614.615364] [<ffffffff811786a5>] writeback_single_inode+0x126/0x2b4 [ 614.615366] [<ffffffff81178f03>] writeback_sb_inodes+0x17f/0x229 [ 614.615369] [<ffffffff81179657>] wb_writeback+0x130/0x23a [ 614.615372] [<ffffffff81179982>] wb_do_writeback+0x8f/0x1b7 [ 614.615374] [<ffffffff81179b5d>] ? bdi_writeback_thread+0xb3/0x215 [ 614.615377] [<ffffffff81179b36>] bdi_writeback_thread+0x8c/0x215 [ 614.615379] [<ffffffff81179aaa>] ? wb_do_writeback+0x1b7/0x1b7 [ 614.615382] [<ffffffff8109db30>] kthread+0x8e/0x96 [ 614.615385] [<ffffffff819ec584>] kernel_thread_helper+0x4/0x10 [ 614.615388] [<ffffffff819e3974>] ? retint_restore_args+0x13/0x13 [ 614.615391] [<ffffffff8109daa2>] ? __init_kthread_worker+0x5b/0x5b [ 614.615393] [<ffffffff819ec580>] ? gs_change+0x13/0x13 [ 614.615395] ---[ end trace af3c59e20d0fb449 ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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