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* Re: [f2fs-dev] kernel BUG at fs/f2fs/segment.c:2391 during xfstest generic/204
       [not found] <20190729174140.GA169027@gmail.com>
@ 2019-08-16  8:37 ` Chao Yu
  2019-08-18 16:03   ` Eric Biggers
  0 siblings, 1 reply; 4+ messages in thread
From: Chao Yu @ 2019-08-16  8:37 UTC (permalink / raw)
  To: Eric Biggers; +Cc: linux-f2fs-devel

Hi Eric,

Sorry for late reply...

I only hit ENOSPC error:

QA output created by 204
line 82: echo: write error: No space left on device

What is your mkfs/mount option?

On 2019/7/30 1:41, Eric Biggers wrote:
> On xfstest generic/204 on f2fs, I'm getting a kernel BUG.
> 
> It bisects to:
> 
> 	commit 1cb50f87e10696e8cc61fb62d0d948e11b0e6dc1
> 	Author: Jaegeuk Kim <jaegeuk@kernel.org>
> 	Date:   Fri Jul 6 16:47:34 2018 -0700
> 
> 	    f2fs: do checkpoint in kill_sb
> 
> Here is the BUG, on v5.3-rc2:
> 
> generic/204 1s ... 	[10:34:22][    6.005271] run fstests generic/204 at 2019-07-29 10:34:22
> ------------[ cut here ]------------
> kernel BUG at fs/f2fs/segment.c:2391!
> invalid opcode: 0000 [#1] SMP
> CPU: 1 PID: 111 Comm: kworker/u4:2 Not tainted 5.3.0-rc2 #4
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> Workqueue: writeback wb_workfn (flush-254:32)
> RIP: 0010:get_new_segment fs/f2fs/segment.c:2382 [inline]
> RIP: 0010:new_curseg+0x350/0x360 fs/f2fs/segment.c:2512
> Code: 8b 7b 48 44 89 ea 41 0f af f6 e8 5b cb 06 00 41 8b 97 18 0b 00 00 41 89 c2 41 0f af d6 39 d0 0f 82 97 fe ff ff e9 a7 fd ff ff <0f> 0b 45 31 e4 45 31 ed e9 47 f2
> RSP: 0018:ffffc9000045f5c8 EFLAGS: 00010246
> RAX: 0000000000000031 RBX: ffff88807b533800 RCX: 0000000000000040
> RDX: 0000000000000031 RSI: 0000000000000000 RDI: ffff88807af35b60
> RBP: ffffc9000045f618 R08: 000000000000000a R09: 0000000000000001
> R10: ffff88807b533828 R11: 0000000000000001 R12: 0000000000000000
> R13: 0000000000000001 R14: 0000000000000000 R15: ffff888078d3c000
> FS:  0000000000000000(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055db93c6b2d8 CR3: 0000000078c43005 CR4: 0000000000760ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
>  allocate_segment_by_default+0x9c/0x100 fs/f2fs/segment.c:2651
>  f2fs_allocate_data_block+0x1f3/0x600 fs/f2fs/segment.c:3101
>  do_write_page+0x9d/0x110 fs/f2fs/segment.c:3165
>  f2fs_do_write_node_page+0x35/0xb0 fs/f2fs/segment.c:3216
>  __write_node_page+0x290/0x660 fs/f2fs/node.c:1574
>  f2fs_sync_node_pages+0x6e1/0x790 fs/f2fs/node.c:1843
>  block_operations fs/f2fs/checkpoint.c:1225 [inline]
>  f2fs_write_checkpoint+0x282/0x920 fs/f2fs/checkpoint.c:1576
>  f2fs_sync_fs+0xc6/0x1b0 fs/f2fs/super.c:1116
>  f2fs_balance_fs_bg+0x107/0x300 fs/f2fs/segment.c:557
>  f2fs_write_node_pages+0x55/0x310 fs/f2fs/node.c:1931
>  do_writepages+0x43/0xf0 mm/page-writeback.c:2342
>  __writeback_single_inode+0x56/0x5b0 fs/fs-writeback.c:1364
>  writeback_sb_inodes+0x253/0x580 fs/fs-writeback.c:1628
>  wb_writeback+0x10f/0x480 fs/fs-writeback.c:1804
>  wb_do_writeback fs/fs-writeback.c:1949 [inline]
>  wb_workfn+0xa9/0x570 fs/fs-writeback.c:1990
>  process_one_work+0x21c/0x5c0 kernel/workqueue.c:2269
>  worker_thread+0x3a/0x3b0 kernel/workqueue.c:2415
>  kthread+0x124/0x140 kernel/kthread.c:255
>  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> ---[ end trace 63bbe1af16f6dd61 ]---
> RIP: 0010:get_new_segment fs/f2fs/segment.c:2382 [inline]
> RIP: 0010:new_curseg+0x350/0x360 fs/f2fs/segment.c:2512
> Code: 8b 7b 48 44 89 ea 41 0f af f6 e8 5b cb 06 00 41 8b 97 18 0b 00 00 41 89 c2 41 0f af d6 39 d0 0f 82 97 fe ff ff e9 a7 fd ff ff <0f> 0b 45 31 e4 45 31 ed e9 47 f2
> RSP: 0018:ffffc9000045f5c8 EFLAGS: 00010246
> RAX: 0000000000000031 RBX: ffff88807b533800 RCX: 0000000000000040
> RDX: 0000000000000031 RSI: 0000000000000000 RDI: ffff88807af35b60
> RBP: ffffc9000045f618 R08: 000000000000000a R09: 0000000000000001
> R10: ffff88807b533828 R11: 0000000000000001 R12: 0000000000000000
> R13: 0000000000000001 R14: 0000000000000000 R15: ffff888078d3c000
> FS:  0000000000000000(0000) GS:ffff88807fd00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055db93c6b2d8 CR3: 0000000078c43005 CR4: 0000000000760ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> 
> 
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> .
> 


_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [f2fs-dev] kernel BUG at fs/f2fs/segment.c:2391 during xfstest generic/204
  2019-08-16  8:37 ` [f2fs-dev] kernel BUG at fs/f2fs/segment.c:2391 during xfstest generic/204 Chao Yu
@ 2019-08-18 16:03   ` Eric Biggers
  2019-08-22  8:29     ` Chao Yu
  0 siblings, 1 reply; 4+ messages in thread
From: Eric Biggers @ 2019-08-18 16:03 UTC (permalink / raw)
  To: Chao Yu; +Cc: linux-f2fs-devel

On Fri, Aug 16, 2019 at 04:37:35PM +0800, Chao Yu wrote:
> Hi Eric,
> 
> Sorry for late reply...
> 
> I only hit ENOSPC error:
> 
> QA output created by 204
> line 82: echo: write error: No space left on device
> 
> What is your mkfs/mount option?
> 

It's:

MKFS_OPTIONS  -- /dev/vdc
MOUNT_OPTIONS -- -o acl,user_xattr /dev/vdc /vdc

Here's the output from 'kvm-xfstests -c f2fs/default generic/204':

KERNEL: kernel	5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1 SMP Sun Aug 18 08:57:34 PDT 2019 x86_64
FSTESTVER: blktests	0ee7eba (Wed, 17 Apr 2019 14:41:39 -0700)
FSTESTVER: fio		fio-3.2 (Fri, 3 Nov 2017 15:23:49 -0600)
FSTESTVER: fsverity	2151209 (Fri, 28 Jun 2019 14:34:41 -0700)
FSTESTVER: quota		59b280e (Mon, 5 Feb 2018 16:48:22 +0100)
FSTESTVER: xfsprogs	v5.2.0-rc0-13-g189981e6 (Mon, 12 Aug 2019 10:34:57 -0700)
FSTESTVER: xfstests	v1.1.0-2641-g43d96649 (Mon, 12 Aug 2019 09:34:21 -0700)
FSTESTVER: xfstests-bld	b9e2900 (Mon, 29 Jul 2019 00:01:44 -0400)
FSTESTCFG: "f2fs/default"
FSTESTSET: "generic/204"
FSTESTEXC: ""
FSTESTOPT: "aex"
MNTOPTS: ""
CPUS: "2"
MEM: "1970.49"
              total        used        free      shared  buff/cache   available
Mem:           1970          57        1828           8          84        1872
Swap:             0           0           0
[    3.504915] blk_update_request: operation not supported error, dev vdd, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
[    4.149867] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
[    4.151515] NFSD: Using legacy client tracking operations.
[    4.248498] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
BEGIN TEST default (1 test): f2fs Sun Aug 18 09:00:05 PDT 2019
DEVICE: /dev/vdd
MKFS_OPTIONS: 
F2FS_MOUNT_OPTIONS: 
FSTYP         -- f2fs
PLATFORM      -- Linux/x86_64 kvm-xfstests 5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1 SMP Sun Aug 18 08:57:34 PDT 2019
MKFS_OPTIONS  -- /dev/vdc
MOUNT_OPTIONS -- -o acl,user_xattr /dev/vdc /vdc

[    5.044711] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
generic/204		[09:00:06][    5.400706] run fstests generic/204 at 2019-08-18 09:00:06
[    5.710696] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
[    7.122703] ------------[ cut here ]------------
[    7.123209] kernel BUG at fs/f2fs/segment.c:2391!
[    7.124232] invalid opcode: 0000 [#1] SMP NOPTI
[    7.124675] CPU: 0 PID: 155 Comm: kworker/u4:2 Not tainted 5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
[    7.125548] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[    7.126565] Workqueue: writeback wb_workfn (flush-254:32)
[    7.127092] RIP: 0010:get_new_segment+0x275/0x280
[    7.127545] Code: 0b 49 8b 7c 24 58 8d 6b 01 89 ca 0f af f5 e8 42 07 09 00 41 0f af af 68 0d 00 00 89 c7 39 c5 0f 86 20 fe ff ff e9 fc fe ff ff <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89
[    7.129349] RSP: 0018:ffffae77401e35c0 EFLAGS: 00010246
[    7.129850] RAX: 0000000000000031 RBX: 0000000000000000 RCX: 0000000000000031
[    7.130534] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff942f740a76c0
[    7.131216] RBP: 0000000000000001 R08: 00000000d4def660 R09: 0000000000000000
[    7.131935] R10: 0000000000000001 R11: 0000000000000000 R12: ffff942f77a1ca80
[    7.132614] R13: 0000000000000000 R14: 0000000000000000 R15: ffff942f7788a000
[    7.133299] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
[    7.134100] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.134651] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
[    7.135335] Call Trace:
[    7.135580]  new_curseg+0xdc/0x160
[    7.135917]  allocate_segment_by_default+0x9a/0x100
[    7.136357]  f2fs_allocate_data_block+0x1ff/0x600
[    7.136821]  ? __write_node_page+0x4c1/0x5d0
[    7.137239]  do_write_page+0x6a/0x120
[    7.137595]  f2fs_do_write_node_page+0x3a/0xb0
[    7.138026]  __write_node_page+0x279/0x5d0
[    7.138390]  f2fs_sync_node_pages+0x614/0x6a0
[    7.138773]  ? __lock_acquire+0x447/0x7c0
[    7.139144]  block_operations+0x260/0x380
[    7.139562]  ? f2fs_write_checkpoint+0xa7/0x540
[    7.140005]  f2fs_write_checkpoint+0x101/0x540
[    7.140434]  f2fs_sync_fs+0xc8/0x1c0
[    7.140782]  f2fs_balance_fs_bg+0x18d/0x2d0
[    7.141192]  ? __lock_acquire+0x447/0x7c0
[    7.141584]  f2fs_write_node_pages+0x54/0x2f0
[    7.142114]  do_writepages+0x41/0xe0
[    7.142580]  __writeback_single_inode+0x54/0x5f0
[    7.143159]  writeback_sb_inodes+0x1fe/0x4c0
[    7.143671]  wb_writeback+0x112/0x470
[    7.144053]  wb_workfn+0xf3/0x5d0
[    7.144425]  ? process_one_work+0x1b0/0x560
[    7.144827]  process_one_work+0x233/0x560
[    7.145220]  worker_thread+0x50/0x3b0
[    7.145573]  kthread+0x108/0x140
[    7.145890]  ? process_one_work+0x560/0x560
[    7.146290]  ? __kthread_create_on_node+0x1a0/0x1a0
[    7.146772]  ret_from_fork+0x27/0x50
[    7.147851] ---[ end trace c53970fd3fcc6658 ]---
[    7.148321] RIP: 0010:get_new_segment+0x275/0x280
[    7.148776] Code: 0b 49 8b 7c 24 58 8d 6b 01 89 ca 0f af f5 e8 42 07 09 00 41 0f af af 68 0d 00 00 89 c7 39 c5 0f 86 20 fe ff ff e9 fc fe ff ff <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89
[    7.150587] RSP: 0018:ffffae77401e35c0 EFLAGS: 00010246
[    7.151096] RAX: 0000000000000031 RBX: 0000000000000000 RCX: 0000000000000031
[    7.151791] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff942f740a76c0
[    7.152531] RBP: 0000000000000001 R08: 00000000d4def660 R09: 0000000000000000
[    7.153218] R10: 0000000000000001 R11: 0000000000000000 R12: ffff942f77a1ca80
[    7.153900] R13: 0000000000000000 R14: 0000000000000000 R15: ffff942f7788a000
[    7.154578] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
[    7.155400] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.155961] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
[    7.156623] ------------[ cut here ]------------
[    7.157066] WARNING: CPU: 0 PID: 155 at kernel/exit.c:785 do_exit.cold+0x62/0xb9
[    7.157802] CPU: 0 PID: 155 Comm: kworker/u4:2 Tainted: G      D           5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
[    7.158802] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[    7.159772] Workqueue: writeback wb_workfn (flush-254:32)
[    7.160330] RIP: 0010:do_exit.cold+0x62/0xb9
[    7.160742] Code: 44 24 10 48 8b 44 24 10 e8 87 b0 a2 00 e9 81 f3 ff ff 48 c7 c7 10 41 27 a5 e8 1e 9d ff ff 48 c7 c7 50 21 26 a5 e8 81 7c 06 00 <0f> 0b e9 0b f3 ff ff 65 48 8b 04 25 c0 5d 01 00 8b 90 b0 03 00 00
[    7.162517] RSP: 0018:ffffae77401e3ee8 EFLAGS: 00010246
[    7.163054] RAX: 0000000000000024 RBX: ffff942f778600c0 RCX: 0000000000000006
[    7.163734] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff942f7d9d6600
[    7.164416] RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
[    7.165115] R10: 0000000000000000 R11: ffffae77401e3da5 R12: 000000000000000b
[    7.165875] R13: 0000000000000006 R14: ffff942f778600c0 R15: ffffffffa46d2ef5
[    7.166560] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
[    7.167333] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.167888] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
[    7.168592] Call Trace:
[    7.168836]  ? kthread+0x108/0x140
[    7.169172]  ? get_new_segment+0x275/0x280
[    7.169567]  rewind_stack_do_exit+0x17/0x20
[    7.169982] irq event stamp: 221765
[    7.170322] hardirqs last  enabled at (221765): [<ffffffffa400168a>] trace_hardirqs_on_thunk+0x1a/0x20
[    7.171232] hardirqs last disabled at (221763): [<ffffffffa4e002a7>] __do_softirq+0x2a7/0x423
[    7.172042] softirqs last  enabled at (221764): [<ffffffffa4e00321>] __do_softirq+0x321/0x423
[    7.172857] softirqs last disabled at (217645): [<ffffffffa40b92af>] irq_exit+0x8f/0xc0
[    7.173673] ---[ end trace c53970fd3fcc6659 ]---
[    7.174154] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:38
[    7.175010] in_atomic(): 1, irqs_disabled(): 0, pid: 155, name: kworker/u4:2
[    7.175679] INFO: lockdep is turned off.
[    7.176106] CPU: 0 PID: 155 Comm: kworker/u4:2 Tainted: G      D W         5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
[    7.177106] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
[    7.178071] Workqueue: writeback wb_workfn (flush-254:32)
[    7.178590] Call Trace:
[    7.178841]  dump_stack+0x67/0x90
[    7.179169]  ___might_sleep.cold+0x9f/0xaf
[    7.179563]  exit_signals+0x1c/0x300
[    7.179911]  do_exit+0xb7/0x7b0
[    7.180217]  ? kthread+0x108/0x140
[    7.180546]  ? get_new_segment+0x275/0x280
[    7.180945]  rewind_stack_do_exit+0x17/0x20
[    7.181365] note: kworker/u4:2[155] exited with preempt_count 1


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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [f2fs-dev] kernel BUG at fs/f2fs/segment.c:2391 during xfstest generic/204
  2019-08-18 16:03   ` Eric Biggers
@ 2019-08-22  8:29     ` Chao Yu
  2019-08-22  9:21       ` Chao Yu
  0 siblings, 1 reply; 4+ messages in thread
From: Chao Yu @ 2019-08-22  8:29 UTC (permalink / raw)
  To: Eric Biggers; +Cc: linux-f2fs-devel

Hi Eric,

I've figured out one patch for this issue, could you have a try?

Thanks,

On 2019/8/19 0:03, Eric Biggers wrote:
> On Fri, Aug 16, 2019 at 04:37:35PM +0800, Chao Yu wrote:
>> Hi Eric,
>>
>> Sorry for late reply...
>>
>> I only hit ENOSPC error:
>>
>> QA output created by 204
>> line 82: echo: write error: No space left on device
>>
>> What is your mkfs/mount option?
>>
> 
> It's:
> 
> MKFS_OPTIONS  -- /dev/vdc
> MOUNT_OPTIONS -- -o acl,user_xattr /dev/vdc /vdc
> 
> Here's the output from 'kvm-xfstests -c f2fs/default generic/204':
> 
> KERNEL: kernel	5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1 SMP Sun Aug 18 08:57:34 PDT 2019 x86_64
> FSTESTVER: blktests	0ee7eba (Wed, 17 Apr 2019 14:41:39 -0700)
> FSTESTVER: fio		fio-3.2 (Fri, 3 Nov 2017 15:23:49 -0600)
> FSTESTVER: fsverity	2151209 (Fri, 28 Jun 2019 14:34:41 -0700)
> FSTESTVER: quota		59b280e (Mon, 5 Feb 2018 16:48:22 +0100)
> FSTESTVER: xfsprogs	v5.2.0-rc0-13-g189981e6 (Mon, 12 Aug 2019 10:34:57 -0700)
> FSTESTVER: xfstests	v1.1.0-2641-g43d96649 (Mon, 12 Aug 2019 09:34:21 -0700)
> FSTESTVER: xfstests-bld	b9e2900 (Mon, 29 Jul 2019 00:01:44 -0400)
> FSTESTCFG: "f2fs/default"
> FSTESTSET: "generic/204"
> FSTESTEXC: ""
> FSTESTOPT: "aex"
> MNTOPTS: ""
> CPUS: "2"
> MEM: "1970.49"
>               total        used        free      shared  buff/cache   available
> Mem:           1970          57        1828           8          84        1872
> Swap:             0           0           0
> [    3.504915] blk_update_request: operation not supported error, dev vdd, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
> [    4.149867] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
> [    4.151515] NFSD: Using legacy client tracking operations.
> [    4.248498] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
> BEGIN TEST default (1 test): f2fs Sun Aug 18 09:00:05 PDT 2019
> DEVICE: /dev/vdd
> MKFS_OPTIONS: 
> F2FS_MOUNT_OPTIONS: 
> FSTYP         -- f2fs
> PLATFORM      -- Linux/x86_64 kvm-xfstests 5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1 SMP Sun Aug 18 08:57:34 PDT 2019
> MKFS_OPTIONS  -- /dev/vdc
> MOUNT_OPTIONS -- -o acl,user_xattr /dev/vdc /vdc
> 
> [    5.044711] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
> generic/204		[09:00:06][    5.400706] run fstests generic/204 at 2019-08-18 09:00:06
> [    5.710696] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
> [    7.122703] ------------[ cut here ]------------
> [    7.123209] kernel BUG at fs/f2fs/segment.c:2391!
> [    7.124232] invalid opcode: 0000 [#1] SMP NOPTI
> [    7.124675] CPU: 0 PID: 155 Comm: kworker/u4:2 Not tainted 5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
> [    7.125548] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
> [    7.126565] Workqueue: writeback wb_workfn (flush-254:32)
> [    7.127092] RIP: 0010:get_new_segment+0x275/0x280
> [    7.127545] Code: 0b 49 8b 7c 24 58 8d 6b 01 89 ca 0f af f5 e8 42 07 09 00 41 0f af af 68 0d 00 00 89 c7 39 c5 0f 86 20 fe ff ff e9 fc fe ff ff <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89
> [    7.129349] RSP: 0018:ffffae77401e35c0 EFLAGS: 00010246
> [    7.129850] RAX: 0000000000000031 RBX: 0000000000000000 RCX: 0000000000000031
> [    7.130534] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff942f740a76c0
> [    7.131216] RBP: 0000000000000001 R08: 00000000d4def660 R09: 0000000000000000
> [    7.131935] R10: 0000000000000001 R11: 0000000000000000 R12: ffff942f77a1ca80
> [    7.132614] R13: 0000000000000000 R14: 0000000000000000 R15: ffff942f7788a000
> [    7.133299] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
> [    7.134100] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    7.134651] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
> [    7.135335] Call Trace:
> [    7.135580]  new_curseg+0xdc/0x160
> [    7.135917]  allocate_segment_by_default+0x9a/0x100
> [    7.136357]  f2fs_allocate_data_block+0x1ff/0x600
> [    7.136821]  ? __write_node_page+0x4c1/0x5d0
> [    7.137239]  do_write_page+0x6a/0x120
> [    7.137595]  f2fs_do_write_node_page+0x3a/0xb0
> [    7.138026]  __write_node_page+0x279/0x5d0
> [    7.138390]  f2fs_sync_node_pages+0x614/0x6a0
> [    7.138773]  ? __lock_acquire+0x447/0x7c0
> [    7.139144]  block_operations+0x260/0x380
> [    7.139562]  ? f2fs_write_checkpoint+0xa7/0x540
> [    7.140005]  f2fs_write_checkpoint+0x101/0x540
> [    7.140434]  f2fs_sync_fs+0xc8/0x1c0
> [    7.140782]  f2fs_balance_fs_bg+0x18d/0x2d0
> [    7.141192]  ? __lock_acquire+0x447/0x7c0
> [    7.141584]  f2fs_write_node_pages+0x54/0x2f0
> [    7.142114]  do_writepages+0x41/0xe0
> [    7.142580]  __writeback_single_inode+0x54/0x5f0
> [    7.143159]  writeback_sb_inodes+0x1fe/0x4c0
> [    7.143671]  wb_writeback+0x112/0x470
> [    7.144053]  wb_workfn+0xf3/0x5d0
> [    7.144425]  ? process_one_work+0x1b0/0x560
> [    7.144827]  process_one_work+0x233/0x560
> [    7.145220]  worker_thread+0x50/0x3b0
> [    7.145573]  kthread+0x108/0x140
> [    7.145890]  ? process_one_work+0x560/0x560
> [    7.146290]  ? __kthread_create_on_node+0x1a0/0x1a0
> [    7.146772]  ret_from_fork+0x27/0x50
> [    7.147851] ---[ end trace c53970fd3fcc6658 ]---
> [    7.148321] RIP: 0010:get_new_segment+0x275/0x280
> [    7.148776] Code: 0b 49 8b 7c 24 58 8d 6b 01 89 ca 0f af f5 e8 42 07 09 00 41 0f af af 68 0d 00 00 89 c7 39 c5 0f 86 20 fe ff ff e9 fc fe ff ff <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89
> [    7.150587] RSP: 0018:ffffae77401e35c0 EFLAGS: 00010246
> [    7.151096] RAX: 0000000000000031 RBX: 0000000000000000 RCX: 0000000000000031
> [    7.151791] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff942f740a76c0
> [    7.152531] RBP: 0000000000000001 R08: 00000000d4def660 R09: 0000000000000000
> [    7.153218] R10: 0000000000000001 R11: 0000000000000000 R12: ffff942f77a1ca80
> [    7.153900] R13: 0000000000000000 R14: 0000000000000000 R15: ffff942f7788a000
> [    7.154578] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
> [    7.155400] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    7.155961] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
> [    7.156623] ------------[ cut here ]------------
> [    7.157066] WARNING: CPU: 0 PID: 155 at kernel/exit.c:785 do_exit.cold+0x62/0xb9
> [    7.157802] CPU: 0 PID: 155 Comm: kworker/u4:2 Tainted: G      D           5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
> [    7.158802] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
> [    7.159772] Workqueue: writeback wb_workfn (flush-254:32)
> [    7.160330] RIP: 0010:do_exit.cold+0x62/0xb9
> [    7.160742] Code: 44 24 10 48 8b 44 24 10 e8 87 b0 a2 00 e9 81 f3 ff ff 48 c7 c7 10 41 27 a5 e8 1e 9d ff ff 48 c7 c7 50 21 26 a5 e8 81 7c 06 00 <0f> 0b e9 0b f3 ff ff 65 48 8b 04 25 c0 5d 01 00 8b 90 b0 03 00 00
> [    7.162517] RSP: 0018:ffffae77401e3ee8 EFLAGS: 00010246
> [    7.163054] RAX: 0000000000000024 RBX: ffff942f778600c0 RCX: 0000000000000006
> [    7.163734] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff942f7d9d6600
> [    7.164416] RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
> [    7.165115] R10: 0000000000000000 R11: ffffae77401e3da5 R12: 000000000000000b
> [    7.165875] R13: 0000000000000006 R14: ffff942f778600c0 R15: ffffffffa46d2ef5
> [    7.166560] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
> [    7.167333] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    7.167888] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
> [    7.168592] Call Trace:
> [    7.168836]  ? kthread+0x108/0x140
> [    7.169172]  ? get_new_segment+0x275/0x280
> [    7.169567]  rewind_stack_do_exit+0x17/0x20
> [    7.169982] irq event stamp: 221765
> [    7.170322] hardirqs last  enabled at (221765): [<ffffffffa400168a>] trace_hardirqs_on_thunk+0x1a/0x20
> [    7.171232] hardirqs last disabled at (221763): [<ffffffffa4e002a7>] __do_softirq+0x2a7/0x423
> [    7.172042] softirqs last  enabled at (221764): [<ffffffffa4e00321>] __do_softirq+0x321/0x423
> [    7.172857] softirqs last disabled at (217645): [<ffffffffa40b92af>] irq_exit+0x8f/0xc0
> [    7.173673] ---[ end trace c53970fd3fcc6659 ]---
> [    7.174154] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:38
> [    7.175010] in_atomic(): 1, irqs_disabled(): 0, pid: 155, name: kworker/u4:2
> [    7.175679] INFO: lockdep is turned off.
> [    7.176106] CPU: 0 PID: 155 Comm: kworker/u4:2 Tainted: G      D W         5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
> [    7.177106] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
> [    7.178071] Workqueue: writeback wb_workfn (flush-254:32)
> [    7.178590] Call Trace:
> [    7.178841]  dump_stack+0x67/0x90
> [    7.179169]  ___might_sleep.cold+0x9f/0xaf
> [    7.179563]  exit_signals+0x1c/0x300
> [    7.179911]  do_exit+0xb7/0x7b0
> [    7.180217]  ? kthread+0x108/0x140
> [    7.180546]  ? get_new_segment+0x275/0x280
> [    7.180945]  rewind_stack_do_exit+0x17/0x20
> [    7.181365] note: kworker/u4:2[155] exited with preempt_count 1
> .
> 


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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [f2fs-dev] kernel BUG at fs/f2fs/segment.c:2391 during xfstest generic/204
  2019-08-22  8:29     ` Chao Yu
@ 2019-08-22  9:21       ` Chao Yu
  0 siblings, 0 replies; 4+ messages in thread
From: Chao Yu @ 2019-08-22  9:21 UTC (permalink / raw)
  To: Eric Biggers; +Cc: linux-f2fs-devel

On 2019/8/22 16:29, Chao Yu wrote:
> Hi Eric,
> 
> I've figured out one patch for this issue, could you have a try?

Could you only check 204? I just hit deadlock in 051, not sure it is caused by
this patch.

> 
> Thanks,
> 
> On 2019/8/19 0:03, Eric Biggers wrote:
>> On Fri, Aug 16, 2019 at 04:37:35PM +0800, Chao Yu wrote:
>>> Hi Eric,
>>>
>>> Sorry for late reply...
>>>
>>> I only hit ENOSPC error:
>>>
>>> QA output created by 204
>>> line 82: echo: write error: No space left on device
>>>
>>> What is your mkfs/mount option?
>>>
>>
>> It's:
>>
>> MKFS_OPTIONS  -- /dev/vdc
>> MOUNT_OPTIONS -- -o acl,user_xattr /dev/vdc /vdc
>>
>> Here's the output from 'kvm-xfstests -c f2fs/default generic/204':
>>
>> KERNEL: kernel	5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1 SMP Sun Aug 18 08:57:34 PDT 2019 x86_64
>> FSTESTVER: blktests	0ee7eba (Wed, 17 Apr 2019 14:41:39 -0700)
>> FSTESTVER: fio		fio-3.2 (Fri, 3 Nov 2017 15:23:49 -0600)
>> FSTESTVER: fsverity	2151209 (Fri, 28 Jun 2019 14:34:41 -0700)
>> FSTESTVER: quota		59b280e (Mon, 5 Feb 2018 16:48:22 +0100)
>> FSTESTVER: xfsprogs	v5.2.0-rc0-13-g189981e6 (Mon, 12 Aug 2019 10:34:57 -0700)
>> FSTESTVER: xfstests	v1.1.0-2641-g43d96649 (Mon, 12 Aug 2019 09:34:21 -0700)
>> FSTESTVER: xfstests-bld	b9e2900 (Mon, 29 Jul 2019 00:01:44 -0400)
>> FSTESTCFG: "f2fs/default"
>> FSTESTSET: "generic/204"
>> FSTESTEXC: ""
>> FSTESTOPT: "aex"
>> MNTOPTS: ""
>> CPUS: "2"
>> MEM: "1970.49"
>>               total        used        free      shared  buff/cache   available
>> Mem:           1970          57        1828           8          84        1872
>> Swap:             0           0           0
>> [    3.504915] blk_update_request: operation not supported error, dev vdd, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
>> [    4.149867] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
>> [    4.151515] NFSD: Using legacy client tracking operations.
>> [    4.248498] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
>> BEGIN TEST default (1 test): f2fs Sun Aug 18 09:00:05 PDT 2019
>> DEVICE: /dev/vdd
>> MKFS_OPTIONS: 
>> F2FS_MOUNT_OPTIONS: 
>> FSTYP         -- f2fs
>> PLATFORM      -- Linux/x86_64 kvm-xfstests 5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1 SMP Sun Aug 18 08:57:34 PDT 2019
>> MKFS_OPTIONS  -- /dev/vdc
>> MOUNT_OPTIONS -- -o acl,user_xattr /dev/vdc /vdc
>>
>> [    5.044711] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
>> generic/204		[09:00:06][    5.400706] run fstests generic/204 at 2019-08-18 09:00:06
>> [    5.710696] blk_update_request: operation not supported error, dev vdc, sector 8388606 op 0x3:(DISCARD) flags 0x0 phys_seg 2 prio class 0
>> [    7.122703] ------------[ cut here ]------------
>> [    7.123209] kernel BUG at fs/f2fs/segment.c:2391!
>> [    7.124232] invalid opcode: 0000 [#1] SMP NOPTI
>> [    7.124675] CPU: 0 PID: 155 Comm: kworker/u4:2 Not tainted 5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
>> [    7.125548] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
>> [    7.126565] Workqueue: writeback wb_workfn (flush-254:32)
>> [    7.127092] RIP: 0010:get_new_segment+0x275/0x280
>> [    7.127545] Code: 0b 49 8b 7c 24 58 8d 6b 01 89 ca 0f af f5 e8 42 07 09 00 41 0f af af 68 0d 00 00 89 c7 39 c5 0f 86 20 fe ff ff e9 fc fe ff ff <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89
>> [    7.129349] RSP: 0018:ffffae77401e35c0 EFLAGS: 00010246
>> [    7.129850] RAX: 0000000000000031 RBX: 0000000000000000 RCX: 0000000000000031
>> [    7.130534] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff942f740a76c0
>> [    7.131216] RBP: 0000000000000001 R08: 00000000d4def660 R09: 0000000000000000
>> [    7.131935] R10: 0000000000000001 R11: 0000000000000000 R12: ffff942f77a1ca80
>> [    7.132614] R13: 0000000000000000 R14: 0000000000000000 R15: ffff942f7788a000
>> [    7.133299] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
>> [    7.134100] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    7.134651] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
>> [    7.135335] Call Trace:
>> [    7.135580]  new_curseg+0xdc/0x160
>> [    7.135917]  allocate_segment_by_default+0x9a/0x100
>> [    7.136357]  f2fs_allocate_data_block+0x1ff/0x600
>> [    7.136821]  ? __write_node_page+0x4c1/0x5d0
>> [    7.137239]  do_write_page+0x6a/0x120
>> [    7.137595]  f2fs_do_write_node_page+0x3a/0xb0
>> [    7.138026]  __write_node_page+0x279/0x5d0
>> [    7.138390]  f2fs_sync_node_pages+0x614/0x6a0
>> [    7.138773]  ? __lock_acquire+0x447/0x7c0
>> [    7.139144]  block_operations+0x260/0x380
>> [    7.139562]  ? f2fs_write_checkpoint+0xa7/0x540
>> [    7.140005]  f2fs_write_checkpoint+0x101/0x540
>> [    7.140434]  f2fs_sync_fs+0xc8/0x1c0
>> [    7.140782]  f2fs_balance_fs_bg+0x18d/0x2d0
>> [    7.141192]  ? __lock_acquire+0x447/0x7c0
>> [    7.141584]  f2fs_write_node_pages+0x54/0x2f0
>> [    7.142114]  do_writepages+0x41/0xe0
>> [    7.142580]  __writeback_single_inode+0x54/0x5f0
>> [    7.143159]  writeback_sb_inodes+0x1fe/0x4c0
>> [    7.143671]  wb_writeback+0x112/0x470
>> [    7.144053]  wb_workfn+0xf3/0x5d0
>> [    7.144425]  ? process_one_work+0x1b0/0x560
>> [    7.144827]  process_one_work+0x233/0x560
>> [    7.145220]  worker_thread+0x50/0x3b0
>> [    7.145573]  kthread+0x108/0x140
>> [    7.145890]  ? process_one_work+0x560/0x560
>> [    7.146290]  ? __kthread_create_on_node+0x1a0/0x1a0
>> [    7.146772]  ret_from_fork+0x27/0x50
>> [    7.147851] ---[ end trace c53970fd3fcc6658 ]---
>> [    7.148321] RIP: 0010:get_new_segment+0x275/0x280
>> [    7.148776] Code: 0b 49 8b 7c 24 58 8d 6b 01 89 ca 0f af f5 e8 42 07 09 00 41 0f af af 68 0d 00 00 89 c7 39 c5 0f 86 20 fe ff ff e9 fc fe ff ff <0f> 0b 0f 0b 0f 1f 80 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89
>> [    7.150587] RSP: 0018:ffffae77401e35c0 EFLAGS: 00010246
>> [    7.151096] RAX: 0000000000000031 RBX: 0000000000000000 RCX: 0000000000000031
>> [    7.151791] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff942f740a76c0
>> [    7.152531] RBP: 0000000000000001 R08: 00000000d4def660 R09: 0000000000000000
>> [    7.153218] R10: 0000000000000001 R11: 0000000000000000 R12: ffff942f77a1ca80
>> [    7.153900] R13: 0000000000000000 R14: 0000000000000000 R15: ffff942f7788a000
>> [    7.154578] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
>> [    7.155400] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    7.155961] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
>> [    7.156623] ------------[ cut here ]------------
>> [    7.157066] WARNING: CPU: 0 PID: 155 at kernel/exit.c:785 do_exit.cold+0x62/0xb9
>> [    7.157802] CPU: 0 PID: 155 Comm: kworker/u4:2 Tainted: G      D           5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
>> [    7.158802] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
>> [    7.159772] Workqueue: writeback wb_workfn (flush-254:32)
>> [    7.160330] RIP: 0010:do_exit.cold+0x62/0xb9
>> [    7.160742] Code: 44 24 10 48 8b 44 24 10 e8 87 b0 a2 00 e9 81 f3 ff ff 48 c7 c7 10 41 27 a5 e8 1e 9d ff ff 48 c7 c7 50 21 26 a5 e8 81 7c 06 00 <0f> 0b e9 0b f3 ff ff 65 48 8b 04 25 c0 5d 01 00 8b 90 b0 03 00 00
>> [    7.162517] RSP: 0018:ffffae77401e3ee8 EFLAGS: 00010246
>> [    7.163054] RAX: 0000000000000024 RBX: ffff942f778600c0 RCX: 0000000000000006
>> [    7.163734] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff942f7d9d6600
>> [    7.164416] RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
>> [    7.165115] R10: 0000000000000000 R11: ffffae77401e3da5 R12: 000000000000000b
>> [    7.165875] R13: 0000000000000006 R14: ffff942f778600c0 R15: ffffffffa46d2ef5
>> [    7.166560] FS:  0000000000000000(0000) GS:ffff942f7d800000(0000) knlGS:0000000000000000
>> [    7.167333] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [    7.167888] CR2: 00005653dde81238 CR3: 00000000745f4000 CR4: 00000000003406f0
>> [    7.168592] Call Trace:
>> [    7.168836]  ? kthread+0x108/0x140
>> [    7.169172]  ? get_new_segment+0x275/0x280
>> [    7.169567]  rewind_stack_do_exit+0x17/0x20
>> [    7.169982] irq event stamp: 221765
>> [    7.170322] hardirqs last  enabled at (221765): [<ffffffffa400168a>] trace_hardirqs_on_thunk+0x1a/0x20
>> [    7.171232] hardirqs last disabled at (221763): [<ffffffffa4e002a7>] __do_softirq+0x2a7/0x423
>> [    7.172042] softirqs last  enabled at (221764): [<ffffffffa4e00321>] __do_softirq+0x321/0x423
>> [    7.172857] softirqs last disabled at (217645): [<ffffffffa40b92af>] irq_exit+0x8f/0xc0
>> [    7.173673] ---[ end trace c53970fd3fcc6659 ]---
>> [    7.174154] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:38
>> [    7.175010] in_atomic(): 1, irqs_disabled(): 0, pid: 155, name: kworker/u4:2
>> [    7.175679] INFO: lockdep is turned off.
>> [    7.176106] CPU: 0 PID: 155 Comm: kworker/u4:2 Tainted: G      D W         5.3.0-rc4-xfstests-00142-g8fde2832bd0b #1
>> [    7.177106] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-20181126_142135-anatol 04/01/2014
>> [    7.178071] Workqueue: writeback wb_workfn (flush-254:32)
>> [    7.178590] Call Trace:
>> [    7.178841]  dump_stack+0x67/0x90
>> [    7.179169]  ___might_sleep.cold+0x9f/0xaf
>> [    7.179563]  exit_signals+0x1c/0x300
>> [    7.179911]  do_exit+0xb7/0x7b0
>> [    7.180217]  ? kthread+0x108/0x140
>> [    7.180546]  ? get_new_segment+0x275/0x280
>> [    7.180945]  rewind_stack_do_exit+0x17/0x20
>> [    7.181365] note: kworker/u4:2[155] exited with preempt_count 1
>> .
>>
> 
> 
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> .
> 


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     [not found] <20190729174140.GA169027@gmail.com>
2019-08-16  8:37 ` [f2fs-dev] kernel BUG at fs/f2fs/segment.c:2391 during xfstest generic/204 Chao Yu
2019-08-18 16:03   ` Eric Biggers
2019-08-22  8:29     ` Chao Yu
2019-08-22  9:21       ` Chao Yu

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	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-f2fs-devel linux-f2fs-devel/ https://lore.kernel.org/linux-f2fs-devel \
		linux-f2fs-devel@lists.sourceforge.net linux-f2fs-devel@archiver.kernel.org
	public-inbox-index linux-f2fs-devel


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/net.sourceforge.lists.linux-f2fs-devel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox