linux-kernel - Re: Commit "new primitive: discard_new

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Date:   Wed, 1 Aug 2018 19:19:35 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Commit "new primitive: discard_new_inode()" introduces a problem

On 01.08.2018 19:16, Al Viro wrote:
> On Wed, Aug 01, 2018 at 05:11:51PM +0100, Al Viro wrote:
>> On Wed, Aug 01, 2018 at 06:43:56PM +0300, Kirill Tkhai wrote:
>>> #git status
>>> HEAD detached at 22dc9a168272
>>
>> Wait a sec - just that commit?  With discard_new_inode() not even
>> used anywhere?  Then any of those -ENOMEM is disguised ERR_PTR(-ESTALE)
>> from find_inode()/find_inode_fast(), i.e. an inode found by
>> iget5_locked() (your /etc is on ext4) with I_CREATING still set.
> 
> iget_locked(), that is.

[   32.266377] WARNING: CPU: 0 PID: 2301 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   32.268509] CPU: 0 PID: 2301 Comm: grep Not tainted 4.18.0-rc1+ #32
[   32.269209] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   32.269789] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   32.271876] RSP: 0018:ffffc9000113fb80 EFLAGS: 00010282
[   32.272448] RAX: 0000000080000001 RBX: ffff88013aff9088 RCX: 0000000000000002
[   32.273231] RDX: 0000000080000002 RSI: ffff88013fec2350 RDI: 00000000ffffffff
[   32.274019] RBP: 00000000000405fb R08: ffff88013950c400 R09: ffff88013ac43ea0
[   32.274796] R10: 0000000000000014 R11: 0000000000000014 R12: ffff88013b199000
[   32.275579] R13: ffff88013fec2350 R14: ffff88013aff90f8 R15: ffff880135cb5180
[   32.276355] FS:  0000000000000000(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000
[   32.277189] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.277786] CR2: 00007f6f73e26018 CR3: 000000013a98f000 CR4: 00000000000006b0
[   32.278513] Call Trace:
[   32.278777]  ? iget_locked+0x69/0x190
[   32.279162]  ? ext4_iget+0x3f/0xc00
[   32.279443]  ? preempt_count_add+0x44/0x90
[   32.279733]  ? d_alloc_parallel+0x358/0x4f0
[   32.280039]  ? ext4_lookup+0xd6/0x200
[   32.280282]  ? path_openat+0x9d6/0x1400
[   32.280537]  ? do_filp_open+0x8e/0x100
[   32.280842]  ? __lru_cache_add+0x6e/0x90
[   32.281300]  ? kmem_cache_alloc+0x22/0x120
[   32.281544]  ? do_sys_open+0x181/0x210
[   32.281789]  ? do_syscall_64+0x56/0x2f0
[   32.282046]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.282351] ---[ end trace 109b3dd4fd5e6451 ]---
[   32.282657] WARNING: CPU: 3 PID: 2300 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   32.283126] CPU: 3 PID: 2300 Comm: parallels-serve Tainted: G        W         4.18.0-rc1+ #32
[   32.283595] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   32.283881] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   32.285066] RSP: 0018:ffffc90001137b80 EFLAGS: 00010282
[   32.285397] RAX: 0000000080000001 RBX: ffff88013aff9088 RCX: 0000000000000002
[   32.285829] RDX: 0000000080000002 RSI: ffff88013fec2350 RDI: 00000000ffffffff
[   32.286218] RBP: 00000000000405fb R08: ffff88013950c400 R09: ffff88013ac43ea0
[   32.286601] R10: 0000000000000014 R11: 0000000000000014 R12: ffff88013b199000
[   32.287035] R13: ffff88013fec2350 R14: ffff88013aff90f8 R15: ffff880135cb5180
[   32.287430] FS:  0000000000000000(0000) GS:ffff88013fd80000(0000) knlGS:0000000000000000
[   32.287872] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.288202] CR2: 00007ffd0f3e4f68 CR3: 0000000139d59000 CR4: 00000000000006a0
[   32.288650] Call Trace:
[   32.288871]  ? iget_locked+0x69/0x190
[   32.289106]  ? ext4_iget+0x3f/0xc00
[   32.289333]  ? preempt_count_add+0x44/0x90
[   32.289595]  ? d_alloc_parallel+0x358/0x4f0
[   32.289858]  ? ext4_lookup+0xd6/0x200
[   32.290059]  ? path_openat+0x9d6/0x1400
[   32.290268]  ? __mod_node_page_state+0x64/0xa0
[   32.290510]  ? do_filp_open+0x8e/0x100
[   32.290721]  ? __lru_cache_add+0x6e/0x90
[   32.290968]  ? _raw_spin_unlock+0xd/0x20
[   32.291218]  ? __handle_mm_fault+0x6f2/0xbf0
[   32.291473]  ? do_sys_open+0x181/0x210
[   32.291684]  ? do_syscall_64+0x56/0x2f0
[   32.291932]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.292239] ---[ end trace 109b3dd4fd5e6452 ]---
[   32.314195] WARNING: CPU: 1 PID: 2303 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   32.314866] CPU: 1 PID: 2303 Comm: uname Tainted: G        W         4.18.0-rc1+ #32
[   32.315479] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   32.315889] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   32.317376] RSP: 0018:ffffc900010ffb80 EFLAGS: 00010282
[   32.317797] RAX: 0000000080000001 RBX: ffff88013aff9088 RCX: 0000000000000002
[   32.318374] RDX: 0000000080000002 RSI: ffff88013fec2350 RDI: 00000000ffffffff
[   32.318979] RBP: 00000000000405fb R08: ffff88013950c400 R09: ffff88013ac43ea0
[   32.319529] R10: 0000000000000014 R11: 0000000000000014 R12: ffff88013b199000
[   32.320089] R13: ffff88013fec2350 R14: ffff88013aff90f8 R15: ffff880135cb5180
[   32.320630] FS:  0000000000000000(0000) GS:ffff88013fc80000(0000) knlGS:0000000000000000
[   32.321258] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.321697] CR2: 00007ffc86055fe4 CR3: 000000013b2a4000 CR4: 00000000000006a0
[   32.322254] Call Trace:
[   32.322450]  ? iget_locked+0x69/0x190
[   32.322739]  ? ext4_iget+0x3f/0xc00
[   32.323015]  ? preempt_count_add+0x44/0x90
[   32.323334]  ? d_alloc_parallel+0x358/0x4f0
[   32.323655]  ? ext4_lookup+0xd6/0x200
[   32.323943]  ? path_openat+0x9d6/0x1400
[   32.324248]  ? do_filp_open+0x8e/0x100
[   32.324541]  ? __lru_cache_add+0x6e/0x90
[   32.324833]  ? _raw_spin_unlock+0xd/0x20
[   32.325088]  ? __handle_mm_fault+0x6f2/0xbf0
[   32.325335]  ? do_sys_open+0x181/0x210
[   32.325551]  ? do_syscall_64+0x56/0x2f0
[   32.325778]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.326100] ---[ end trace 109b3dd4fd5e6453 ]---
[   32.328654] WARNING: CPU: 3 PID: 2304 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   32.329183] CPU: 3 PID: 2304 Comm: grep Tainted: G        W         4.18.0-rc1+ #32
[   32.329600] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   32.329887] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   32.330947] RSP: 0018:ffffc900010ffb80 EFLAGS: 00010282
[   32.331246] RAX: 0000000080000001 RBX: ffff88013aff9088 RCX: 0000000000000002
[   32.331651] RDX: 0000000080000002 RSI: ffff88013fec2350 RDI: 00000000ffffffff
[   32.332083] RBP: 00000000000405fb R08: ffff88013950c400 R09: ffff88013ac43ea0
[   32.332476] R10: 0000000000000014 R11: 0000000000000014 R12: ffff88013b199000
[   32.332871] R13: ffff88013fec2350 R14: ffff88013aff90f8 R15: ffff880135cb5180
[   32.333277] FS:  0000000000000000(0000) GS:ffff88013fd80000(0000) knlGS:0000000000000000
[   32.333725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.334054] CR2: 00007f49836d1018 CR3: 0000000139475000 CR4: 00000000000006a0
[   32.334438] Call Trace:
[   32.334578]  ? iget_locked+0x69/0x190
[   32.334790]  ? ext4_iget+0x3f/0xc00
[   32.334990]  ? preempt_count_add+0x44/0x90
[   32.335213]  ? d_alloc_parallel+0x358/0x4f0
[   32.335445]  ? ext4_lookup+0xd6/0x200
[   32.335650]  ? path_openat+0x9d6/0x1400
[   32.335888]  ? mmap_region+0x265/0x590
[   32.336097]  ? do_filp_open+0x8e/0x100
[   32.336306]  ? __lru_cache_add+0x6e/0x90
[   32.336522]  ? kmem_cache_alloc+0x22/0x120
[   32.336756]  ? do_sys_open+0x181/0x210
[   32.336968]  ? do_syscall_64+0x56/0x2f0
[   32.337180]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.337461] ---[ end trace 109b3dd4fd5e6454 ]---
[   32.341735] WARNING: CPU: 1 PID: 2300 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   32.342298] CPU: 1 PID: 2300 Comm: parallels-serve Tainted: G        W         4.18.0-rc1+ #32
[   32.342767] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   32.343116] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   32.344127] RSP: 0018:ffffc90001137a68 EFLAGS: 00010282
[   32.344405] RAX: 0000000080000001 RBX: ffff880135cc1858 RCX: 0000000000000002
[   32.344785] RDX: 0000000080000002 RSI: ffff88013ff13260 RDI: 00000000ffffffff
[   32.345162] RBP: 00000000000c04c0 R08: ffff88013950c400 R09: ffff88013ac46548
[   32.345533] R10: 000000000000001c R11: 000000000000001c R12: ffff88013b199000
[   32.345914] R13: ffff88013ff13260 R14: ffff880135cc18c8 R15: 0000000000000000
[   32.346291] FS:  00007fedf735d700(0000) GS:ffff88013fc80000(0000) knlGS:0000000000000000
[   32.346732] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.347078] CR2: 0000000002741088 CR3: 0000000139d59000 CR4: 00000000000006a0
[   32.347522] Call Trace:
[   32.347676]  ? iget_locked+0x69/0x190
[   32.347893]  ? ext4_iget+0x3f/0xc00
[   32.348082]  ? preempt_count_add+0x44/0x90
[   32.348303]  ? d_alloc_parallel+0x358/0x4f0
[   32.348527]  ? ext4_lookup+0xd6/0x200
[   32.348789]  ? __lookup_slow+0x8c/0x150
[   32.348997]  ? lookup_slow+0x30/0x50
[   32.349190]  ? walk_component+0x1b4/0x490
[   32.349405]  ? path_lookupat.isra.75+0x70/0x200
[   32.349646]  ? filename_lookup.part.76+0x9b/0x120
[   32.349907]  ? kmem_cache_alloc+0x22/0x120
[   32.350127]  ? getname_flags+0x49/0x170
[   32.350333]  ? vfs_statx+0x6e/0xd0
[   32.350517]  ? _raw_spin_unlock+0xd/0x20
[   32.350732]  ? __handle_mm_fault+0x6f2/0xbf0
[   32.350962]  ? __do_sys_newstat+0x39/0x70
[   32.351178]  ? _copy_to_user+0x26/0x30
[   32.351396]  ? __x64_sys_rt_sigprocmask+0x8a/0xd0
[   32.351697]  ? do_syscall_64+0x56/0x2f0
[   32.351946]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.352278] ---[ end trace 109b3dd4fd5e6455 ]---
[   32.352667] WARNING: CPU: 1 PID: 2300 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   32.353193] CPU: 1 PID: 2300 Comm: parallels-serve Tainted: G        W         4.18.0-rc1+ #32
[   32.353739] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   32.354069] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   32.355255] RSP: 0018:ffffc90001137a68 EFLAGS: 00010282
[   32.355566] RAX: 0000000080000001 RBX: ffff880135c8efc8 RCX: 0000000000000002
[   32.355991] RDX: 0000000080000002 RSI: ffff88013ffb6d28 RDI: 00000000ffffffff
[   32.356411] RBP: 00000000000c0485 R08: ffff88013950c400 R09: ffff88013ac453a8
[   32.356792] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88013b199000
[   32.357297] R13: ffff88013ffb6d28 R14: ffff880135c8f038 R15: 0000000000000000
[   32.357820] FS:  00007fedf735d700(0000) GS:ffff88013fc80000(0000) knlGS:0000000000000000
[   32.358430] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.359200] CR2: 0000000002741088 CR3: 0000000139d59000 CR4: 00000000000006a0
[   32.359622] Call Trace:
[   32.359768]  ? iget_locked+0x69/0x190
[   32.359967]  ? ext4_iget+0x3f/0xc00
[   32.360167]  ? preempt_count_add+0x44/0x90
[   32.360388]  ? d_alloc_parallel+0x358/0x4f0
[   32.360615]  ? ext4_lookup+0xd6/0x200
[   32.360820]  ? __lookup_slow+0x8c/0x150
[   32.361031]  ? lookup_slow+0x30/0x50
[   32.361224]  ? walk_component+0x1b4/0x490
[   32.361439]  ? path_lookupat.isra.75+0x70/0x200
[   32.361698]  ? filename_lookup.part.76+0x9b/0x120
[   32.361974]  ? kmem_cache_alloc+0x22/0x120
[   32.362215]  ? getname_flags+0x49/0x170
[   32.362436]  ? vfs_statx+0x6e/0xd0
[   32.362634]  ? _raw_spin_unlock+0xd/0x20
[   32.362868]  ? __handle_mm_fault+0x6f2/0xbf0
[   32.363108]  ? __do_sys_newstat+0x39/0x70
[   32.363357]  ? sigprocmask+0x6d/0x90
[   32.363546]  ? _copy_to_user+0x26/0x30
[   32.363776]  ? __x64_sys_rt_sigprocmask+0x8a/0xd0
[   32.364046]  ? do_syscall_64+0x56/0x2f0
[   32.364259]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   32.364546] ---[ end trace 109b3dd4fd5e6456 ]---
[   33.075577] WARNING: CPU: 3 PID: 2305 at fs/inode.c:841 find_inode_fast.isra.24+0x90/0xa0
[   33.076723] CPU: 3 PID: 2305 Comm: dmesg Tainted: G        W         4.18.0-rc1+ #32
[   33.077766] RIP: 0010:find_inode_fast.isra.24+0x90/0xa0
[   33.078466] Code: 48 89 d8 5b 5d 41 5c 41 5d 41 5e c3 f6 c4 80 75 11 f0 ff 83 30 01 00 00 4c 89 f7 e8 4a 7c 24 00 eb de 4c 89 f7 e8 40 7c 24 00 <0f> 0b 48 c7 c3 8c ff ff ff eb cb 0f 1f 44 00 00 41 54 49 c7 c4 30 
[   33.081018] RSP: 0018:ffffc90001107b80 EFLAGS: 00010282
[   33.081721] RAX: 0000000080000001 RBX: ffff88013aff9088 RCX: 0000000000000002
[   33.082670] RDX: 0000000080000002 RSI: ffff88013fec2350 RDI: 00000000ffffffff
[   33.083613] RBP: 00000000000405fb R08: ffff88013950c400 R09: ffff88013ac43ea0
[   33.084521] R10: 0000000000000014 R11: 0000000000000014 R12: ffff88013b199000
[   33.085259] R13: ffff88013fec2350 R14: ffff88013aff90f8 R15: ffff880135cb5180
[   33.085882] FS:  0000000000000000(0000) GS:ffff88013fd80000(0000) knlGS:0000000000000000
[   33.086433] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.086841] CR2: 00007f85a9d03018 CR3: 0000000139d99000 CR4: 00000000000006a0
[   33.087267] Call Trace:
[   33.087410]  ? iget_locked+0x69/0x190
[   33.087839]  ? ext4_iget+0x3f/0xc00
[   33.088059]  ? preempt_count_add+0x44/0x90
[   33.088285]  ? d_alloc_parallel+0x358/0x4f0
[   33.088515]  ? ext4_lookup+0xd6/0x200
[   33.088725]  ? path_openat+0x9d6/0x1400
[   33.088937]  ? do_filp_open+0x8e/0x100
[   33.089153]  ? __lru_cache_add+0x6e/0x90
[   33.089363]  ? kmem_cache_alloc+0x22/0x120
[   33.089582]  ? do_sys_open+0x181/0x210
[   33.089788]  ? do_syscall_64+0x56/0x2f0
[   33.089994]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   33.090271] ---[ end trace 109b3dd4fd5e6457 ]---