On Sat, Nov 17, 2018 at 4:36 PM Naruto Nguyen <narutonguyen2...@gmail.com> wrote:
> Hi Mulyadi, > > Thanks for your answer. I have updated to kernel 4.4.121 but the issue > still exists. I will try to update to kernel 4.4.163. But if you could > provide any reason that why i did not see the issue in the 3.12 kernel and > now it happens in 4.4, any changes in 4.4 can trigger the issue? And if > kernel 4.4.163 has any changes to fix the issue? > > Hi.. Please don't top post. As for the "why", that I don't know. There are too many changes between 3.x and 4.x. That's why checking if the issue still happens with latest stable version IS the first logical step . > Thanks, > Naruto > > On Friday, 16 November 2018, Mulyadi Santosa <mulyadi.sant...@gmail.com> > wrote: > >> >> >> On Thu, Nov 15, 2018 at 11:57 PM Naruto Nguyen < >> narutonguyen2...@gmail.com> wrote: >> >>> Hi everyone, >>> >>> Recently when I upgrade my kernel from 3.12.61 to kernel 4.4.74, I >>> >> >> Hi. >> >> You need to upgrade, either using 4.19.2, 4.18.2, or 4.4.163 (if you >> prefer to stay with 4.4.x) and see if it still happens >> >> find my system sometimes is very slow and unresponsive >>> >>> When my system is under a heavy IO load, I see the node start to >>> respond very slow, the IO wait time keeps very high, and the node >>> starts unresponsive. I try to dump all block task at that time and >>> found some interesting things, look like under a heavy load I/O, the >>> kswap start to hang in jbd2_log_wait_commit. >>> >>> Sep 07 12:25:35 myPC kernel: [11039.126514] kswapd0 D >>> 0000000000000000 0 26 2 0x00000000 >>> Sep 07 12:25:35 myPC kernel: [11039.126517] ffff88003da27b78 >>> ffff88000ce08280 ffff88003cdf0680 ffff88003da28000 >>> Sep 07 12:25:35 myPC kernel: [11039.126519] ffff88001a15c888 >>> ffff88001a15c824 ffff88003da27bb8 ffff88001a15c8a0 >>> Sep 07 12:25:35 myPC kernel: [11039.126521] ffff88003da27b90 >>> ffffffff815e4c85 ffff88001a15c800 0000000000013183 >>> Sep 07 12:25:35 myPC kernel: [11039.126522] Call Trace: >>> Sep 07 12:25:35 myPC kernel: [11039.126539] [<ffffffff815e4c85>] >>> schedule+0x35/0x80 >>> Sep 07 12:25:35 myPC kernel: [11039.126561] [<ffffffffa02faada>] >>> jbd2_log_wait_commit+0x8a/0xf0 [jbd2] >>> Sep 07 12:25:35 myPC kernel: [11039.126621] [<ffffffffa03b28a4>] >>> ext4_evict_inode+0x2d4/0x4b0 [ext4] >>> Sep 07 12:25:35 myPC kernel: [11039.126630] [<ffffffff81215a7a>] >>> evict+0xba/0x190 >>> Sep 07 12:25:35 myPC kernel: [11039.126635] [<ffffffff81215b82>] >>> dispose_list+0x32/0x50 >>> Sep 07 12:25:35 myPC kernel: [11039.126639] [<ffffffff81216e52>] >>> prune_icache_sb+0x42/0x50 >>> Sep 07 12:25:35 myPC kernel: [11039.126644] [<ffffffff811ff8f6>] >>> super_cache_scan+0x136/0x180 >>> Sep 07 12:25:35 myPC kernel: [11039.126653] [<ffffffff81196a1b>] >>> shrink_slab.part.41+0x20b/0x3f0 >>> Sep 07 12:25:35 myPC kernel: [11039.126521] ffff88003da27b90 >>> ffffffff815e4c85 ffff88001a15c800 0000000000013183 >>> >>> And after that more and more processes are hitting STAT D, nfsd is >>> hang to wait or the inode deletion to complete in >>> __wait_on_freeing_inode. >>> >>> Sep 07 12:25:35 myPC kernel: [11039.390218] nfsd D >>> 0000000000000000 0 30419 2 0x00000080 >>> Sep 07 12:25:35 myPC kernel: [11039.390221] ffff88000da47a98 >>> ffff8800277ec380 ffff8800374ec580 ffff88000da48000 >>> Sep 07 12:25:35 myPC kernel: [11039.390223] ffff88000da47ad8 >>> ffffc9000011edc8 0000000000000000 ffff88000e92e2f8 >>> Sep 07 12:25:35 myPC kernel: [11039.390225] ffff88000da47ab0 >>> ffffffff815e4c85 ffffffff81c094c0 ffff88003ff9d8b8 >>> Sep 07 12:25:35 myPC kernel: [11039.390225] Call Trace: >>> Sep 07 12:25:35 myPC kernel: [11039.390231] [<ffffffff815e4c85>] >>> schedule+0x35/0x80 >>> Sep 07 12:25:35 myPC kernel: [11039.390236] [<ffffffff812157fc>] >>> __wait_on_freeing_inode+0x9c/0xc0 >>> Sep 07 12:25:35 myPC kernel: [11039.390241] [<ffffffff81215d83>] >>> find_inode_fast+0x73/0xa0 >>> Sep 07 12:25:35 myPC kernel: [11039.390245] [<ffffffff81216052>] >>> iget_locked+0x72/0x190 >>> Sep 07 12:25:35 myPC kernel: [11039.390284] [<ffffffffa03aeb8c>] >>> ext4_iget+0x2c/0xb10 [ext4] >>> Sep 07 12:25:35 myPC kernel: [11039.390314] [<ffffffffa03c1055>] >>> ext4_nfs_get_inode+0x45/0x80 [ext4] >>> Sep 07 12:25:35 myPC kernel: [11039.390320] [<ffffffff812211c4>] >>> generic_fh_to_dentry+0x24/0x30 >>> Sep 07 12:25:35 myPC kernel: [11039.390326] [<ffffffff81277ede>] >>> exportfs_decode_fh+0x5e/0x350 >>> Sep 07 12:25:35 myPC kernel: [11039.390347] [<ffffffffa047749a>] >>> fh_verify+0x2da/0x5a0 [nfsd] >>> Sep 07 12:25:35 myPC kernel: [11039.390362] [<ffffffffa0480933>] >>> nfsd3_proc_getattr+0x63/0xd0 [nfsd] >>> Sep 07 12:25:35 myPC kernel: [11039.390374] [<ffffffffa0473e23>] >>> nfsd_dispatch+0xc3/0x260 [nfsd] >>> Sep 07 12:25:35 myPC kernel: [11039.390411] [<ffffffffa0322108>] >>> svc_process_common+0x418/0x6a0 [sunrpc] >>> Sep 07 12:25:35 myPC kernel: [11039.390439] [<ffffffffa032248d>] >>> svc_process+0xfd/0x1b0 [sunrpc] >>> Sep 07 12:25:35 myPC kernel: [11039.390454] [<ffffffffa047389a>] >>> nfsd+0xea/0x160 [nfsd] >>> >>> That causes the other nfs client is hang to wait nfsd to continue. >>> >>> Sep 07 12:25:35 myPC kernel: [11039.207987] Call Trace: >>> Sep 07 12:25:35 myPC kernel: [11039.207994] [<ffffffff815e4c85>] >>> schedule+0x35/0x80 >>> Sep 07 12:25:35 myPC kernel: [11039.208008] [<ffffffffa031acce>] >>> rpc_wait_bit_killable+0x1e/0xa0 [sunrpc] >>> Sep 07 12:25:35 myPC kernel: [11039.208055] [<ffffffff815e5098>] >>> __wait_on_bit+0x58/0x90 >>> Sep 07 12:25:35 myPC kernel: [11039.208059] [<ffffffff815e513e>] >>> out_of_line_wait_on_bit+0x6e/0x80 >>> Sep 07 12:25:35 myPC kernel: [11039.208082] [<ffffffffa031bd26>] >>> __rpc_execute+0x146/0x440 [sunrpc] >>> Sep 07 12:25:35 myPC kernel: [11039.208104] [<ffffffffa0313049>] >>> rpc_run_task+0x69/0x80 [sunrpc] >>> Sep 07 12:25:35 myPC kernel: [11039.208126] [<ffffffffa031309f>] >>> rpc_call_sync+0x3f/0xa0 [sunrpc] >>> Sep 07 12:25:35 myPC kernel: [11039.204818] [<ffffffff81200d69>] >>> vfs_fstatat+0x49/0x90 >>> Sep 07 12:25:35 myPC kernel: [11039.204821] [<ffffffff812011ea>] >>> SYSC_newstat+0x1a/0x40 >>> Sep 07 12:25:35 myPC kernel: [11039.204826] [<ffffffff815e876e>] >>> entry_SYSCALL_64_fastpath+0x12/0x6d >>> Sep 07 12:25:35 myPC kernel: [11039.207972] DWARF2 unwinder stuck at >>> entry_SYSCALL_64_fastpath+0x12/0x6d >>> >>> I guess under heavy load, somehow the inode cannot be evicted in >>> kswap, so the nfsd just keeps waiting and cause the whole system ends >>> up in unresponsive state. I found some related issues >>> >>> https://www.systutorials.com/linux-kernels/105429/nfsv4-1-prevent-a-3-way-deadlock-between-layoutreturn-open-and-state-recovery-linux-3-12-17/ >>> (it’s not the same as it’s nfsv4 but just refer for the same symptom.) >>> >>> My system has very limited resource, only 1 core and 1GB RAM and the >>> issue is very easy to happen in a slow disk. However, I did not see >>> the same issue in the older kernel 3.12.61. Could you please let me >>> know if my analysis makes sense, if jbd2_log_wait_commit hang causes >>> __wait_on_freeing_inode wait ? Is it a known issue in kernel? If any >>> kernel change causes the issue?. And if we have any WA to avoid that >>> like preventing kswapd kicks in (I have a 5G swap partition) or to >>> make my system is not unresponsive like that (of course it is not to >>> add more RAM :) ? >>> >>> Thanks a lot >>> Brs, >>> Naruto >>> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies@kernelnewbies.org >>> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >>> >> >> >> -- >> regards, >> >> Mulyadi Santosa >> Freelance Linux trainer and consultant >> >> blog: the-hydra.blogspot.com >> training: mulyaditraining.blogspot.com >> > -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com
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