Message-ID: <20170518131651.GA5148@Red>
Date:   Thu, 18 May 2017 15:16:51 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: WARNING: possible recursive locking detected on linux-next

Hello

Since linux-next-20170516 I got the following warning trace:
[    4.310450] nf_tables: (c) 2007-2009 Patrick McHardy <kaber@...sh.net>

[    4.321211] ============================================
[    4.326516] WARNING: possible recursive locking detected
[    4.331823] 4.12.0-rc1-next-20170518+ #274 Not tainted
[    4.336954] --------------------------------------------
[    4.342258] swapper/0/1 is trying to acquire lock:
[    4.347043]  (cpu_hotplug_lock.rw_sem){++++++}, at: [<c01ccb28>] stop_machine+0x1c/0x3c
[    4.355060] 
               but task is already holding lock:
[    4.360886]  (cpu_hotplug_lock.rw_sem){++++++}, at: [<c01f46c4>] static_key_slow_inc+0x14/0x24
[    4.369501] 
               other info that might help us debug this:
[    4.376021]  Possible unsafe locking scenario:

[    4.381933]        CPU0
[    4.384368]        ----
[    4.386812]   lock(cpu_hotplug_lock.rw_sem);
[    4.391082]   lock(cpu_hotplug_lock.rw_sem);
[    4.395352] 
                *** DEADLOCK ***

[    4.401265]  May be due to missing lock nesting notation

[    4.408046] 5 locks held by swapper/0/1:
[    4.411962]  #0:  (net_mutex){+.+.+.}, at: [<c05d4c08>] register_pernet_subsys+0x28/0x48
[    4.420063]  #1:  (register_ipv4_hooks){+.+.+.}, at: [<c06a4954>] ipv4_hooks_register+0xdc/0x1e0
[    4.428856]  #2:  (defrag4_mutex){+.+.+.}, at: [<c06a5648>] nf_defrag_ipv4_enable+0x48/0x8c
[    4.437213]  #3:  (cpu_hotplug_lock.rw_sem){++++++}, at: [<c01f46c4>] static_key_slow_inc+0x14/0x24
[    4.446261]  #4:  (jump_label_mutex){+.+...}, at: [<c01f463c>] __static_key_slow_inc+0x78/0xec
[    4.454877] 
               stack backtrace:
[    4.459234] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc1-next-20170518+ #274
[    4.466965] Hardware name: Allwinner sun8i Family
[    4.471664] Backtrace: 
[    4.474121] [<c010c6d8>] (dump_backtrace) from [<c010c9b0>] (show_stack+0x18/0x1c)
[    4.481684]  r7:c0c2dbd0 r6:00000000 r5:60000093 r4:c0c2dbd0
[    4.487343] [<c010c998>] (show_stack) from [<c03e86fc>] (dump_stack+0xac/0xd8)
[    4.494564] [<c03e8650>] (dump_stack) from [<c017640c>] (__lock_acquire+0xbc0/0x19f0)
[    4.502389]  r10:ef05b200 r9:c0d8775c r8:00000000 r7:c0c2dcc0 r6:00000000 r5:c14804c0
[    4.510210]  r4:c0d8775c r3:00000000
[    4.513788] [<c017584c>] (__lock_acquire) from [<c0177a00>] (lock_acquire+0x74/0x90)
[    4.521526]  r10:c0b37858 r9:c0c55348 r8:00000001 r7:00000001 r6:60000013 r5:00000000
[    4.529344]  r4:ffffe000
[    4.531883] [<c017798c>] (lock_acquire) from [<c0125500>] (get_online_cpus+0x58/0xe0)
[    4.539706]  r8:c0959750 r7:c01ccb28 r6:c0c18ff4 r5:00000000 r4:c0c19644
[    4.546404] [<c01254a8>] (get_online_cpus) from [<c01ccb28>] (stop_machine+0x1c/0x3c)
[    4.554226]  r7:c09bd960 r6:00000000 r5:ef04dce8 r4:c010f964
[    4.559885] [<c01ccb0c>] (stop_machine) from [<c010f9b0>] (patch_text+0x2c/0x34)
[    4.567273]  r7:c09bd960 r6:c14989d4 r5:c0c58b64 r4:c06ae18c
[    4.572932] [<c010f984>] (patch_text) from [<c010f79c>] (arch_jump_label_transform+0x28/0x44)
[    4.581450] [<c010f774>] (arch_jump_label_transform) from [<c01f3bf8>] (__jump_label_update+0x94/0x9c)
[    4.590745]  r5:c0c58b64 r4:c0c58a68
[    4.594322] [<c01f3b64>] (__jump_label_update) from [<c01f42ec>] (jump_label_update+0x94/0x130)
[    4.603011]  r7:c09bd960 r6:eea28f80 r5:c14989d4 r4:c0c58b64
[    4.608668] [<c01f4258>] (jump_label_update) from [<c01f469c>] (__static_key_slow_inc+0xd8/0xec)
[    4.617444]  r7:c09bd960 r6:eea28f80 r5:c0c57964 r4:c14989d4
[    4.623101] [<c01f45c4>] (__static_key_slow_inc) from [<c01f46cc>] (static_key_slow_inc+0x1c/0x24)
[    4.632047]  r5:c0c57964 r4:c14989d4
[    4.635628] [<c01f46b0>] (static_key_slow_inc) from [<c061763c>] (nf_register_net_hook+0x148/0x1a8)
[    4.644662]  r5:c0c57964 r4:c0c501c0
[    4.648242] [<c06174f4>] (nf_register_net_hook) from [<c0617f90>] (nf_register_net_hooks+0x40/0x78)
[    4.657279]  r9:c0c55348 r8:00000002 r7:c0c4fd00 r6:c0c57b15 r5:00000000 r4:c0c55348
[    4.665019] [<c0617f50>] (nf_register_net_hooks) from [<c06a5674>] (nf_defrag_ipv4_enable+0x74/0x8c)
[    4.674143]  r9:c0c578ae r8:00000009 r7:00000009 r6:c0c57b15 r5:c0c4fd00 r4:00000000
[    4.681883] [<c06a5600>] (nf_defrag_ipv4_enable) from [<c06a4a1c>] (ipv4_hooks_register+0x1a4/0x1e0)
[    4.691003]  r5:c0c4fd00 r4:eea280c0
[    4.694584] [<c06a4878>] (ipv4_hooks_register) from [<c06241c8>] (nf_ct_l3proto_pernet_register+0x30/0x3c)
[    4.704226]  r7:ef0dc980 r6:c0c4fd00 r5:c0c4fd00 r4:00000000
[    4.709886] [<c0624198>] (nf_ct_l3proto_pernet_register) from [<c06a4ea8>] (ipv4_net_init+0x30/0x68)
[    4.719012] [<c06a4e78>] (ipv4_net_init) from [<c05d420c>] (ops_init+0x104/0x16c)
[    4.726486]  r5:eea280c0 r4:c0c552a0
[    4.730065] [<c05d4108>] (ops_init) from [<c05d4b3c>] (register_pernet_operations+0x108/0x1ac)
[    4.738670]  r9:c0c43cbc r8:ef04de70 r7:c0c4fcd0 r6:c0c552a0 r5:00000000 r4:c0c4fd00
[    4.746409] [<c05d4a34>] (register_pernet_operations) from [<c05d4c14>] (register_pernet_subsys+0x34/0x48)
[    4.756054]  r9:00000000 r8:c0c60780 r7:c0b37850 r6:c0c552a0 r5:c0c4fc44 r4:c0c4fc40
[    4.763797] [<c05d4be0>] (register_pernet_subsys) from [<c0b2cf5c>] (nf_conntrack_l3proto_ipv4_init+0x38/0xb4)
[    4.773786]  r7:c0b37850 r6:ffffe000 r5:c0b2cf24 r4:00000000
[    4.779447] [<c0b2cf24>] (nf_conntrack_l3proto_ipv4_init) from [<c0101954>] (do_one_initcall+0x5c/0x198)
[    4.788913]  r5:c0b2cf24 r4:c0c0f4cc
[    4.792494] [<c01018f8>] (do_one_initcall) from [<c0b00ff0>] (kernel_init_freeable+0x254/0x2e8)
[    4.801185]  r9:00000007 r8:c0c60780 r7:c0b37850 r6:c0c60780 r5:c0b48060 r4:c09ff22c
[    4.808926] [<c0b00d9c>] (kernel_init_freeable) from [<c070caf0>] (kernel_init+0x10/0x118)
[    4.817184]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c070cae0
[    4.825001]  r4:00000000
[    4.827542] [<c070cae0>] (kernel_init) from [<c0107f70>] (ret_from_fork+0x14/0x24)
[    4.835102]  r5:c070cae0 r4:00000000

But the same kernel config without netfilter got:
[   11.748845] ============================================
[   11.754151] WARNING: possible recursive locking detected
[   11.759460] 4.12.0-rc1-next-20170518+ #278 Not tainted
[   11.764591] --------------------------------------------
[   11.769897] mount/459 is trying to acquire lock:
[   11.774510]  (cpu_hotplug_lock.rw_sem){++++++}, at: [<c01ccb28>] stop_machine+0x1c/0x3c
[   11.782527] 
               but task is already holding lock:
[   11.788352]  (cpu_hotplug_lock.rw_sem){++++++}, at: [<c01f445c>] static_key_slow_dec+0x28/0x64
[   11.796968] 
               other info that might help us debug this:
[   11.803488]  Possible unsafe locking scenario:

[   11.809400]        CPU0
[   11.811844]        ----
[   11.814287]   lock(cpu_hotplug_lock.rw_sem);
[   11.818557]   lock(cpu_hotplug_lock.rw_sem);
[   11.822827] 
                *** DEADLOCK ***

[   11.828741]  May be due to missing lock nesting notation

[   11.835522] 3 locks held by mount/459:
[   11.839266]  #0:  (cgroup_mutex){+.+.+.}, at: [<c01bdf30>] cgroup_lock_and_drain_offline+0x38/0x318
[   11.848318]  #1:  (cpu_hotplug_lock.rw_sem){++++++}, at: [<c01f445c>] static_key_slow_dec+0x28/0x64
[   11.857367]  #2:  (jump_label_mutex){+.+...}, at: [<c01f43a8>] __static_key_slow_dec+0x20/0xac
[   11.865983] 
               stack backtrace:
[   11.870341] CPU: 3 PID: 459 Comm: mount Not tainted 4.12.0-rc1-next-20170518+ #278
[   11.877899] Hardware name: Allwinner sun8i Family
[   11.882596] Backtrace: 
[   11.885054] [<c010c6d8>] (dump_backtrace) from [<c010c9b0>] (show_stack+0x18/0x1c)
[   11.892618]  r7:c0a24f50 r6:00000000 r5:600f0093 r4:c0a24f50
[   11.898277] [<c010c998>] (show_stack) from [<c03e86fc>] (dump_stack+0xac/0xd8)
[   11.905499] [<c03e8650>] (dump_stack) from [<c017640c>] (__lock_acquire+0xbc0/0x19f0)
[   11.913324]  r10:eebe4b00 r9:c0b7d61c r8:00000000 r7:c0a25040 r6:00000000 r5:c1276380
[   11.921143]  r4:c0b7d61c r3:00000000
[   11.924721] [<c017584c>] (__lock_acquire) from [<c0177a00>] (lock_acquire+0x74/0x90)
[   11.932458]  r10:c1266c28 r9:c1266c28 r8:00000001 r7:00000001 r6:600f0013 r5:00000000
[   11.940277]  r4:ffffe000
[   11.942817] [<c017798c>] (lock_acquire) from [<c0125500>] (get_online_cpus+0x58/0xe0)
[   11.950640]  r8:0000003c r7:c01ccb28 r6:c0a10374 r5:00000000 r4:c0a109c4
[   11.957337] [<c01254a8>] (get_online_cpus) from [<c01ccb28>] (stop_machine+0x1c/0x3c)
[   11.965160]  r7:c12658c4 r6:00000000 r5:eeb85ca0 r4:c010f964
[   11.970819] [<c01ccb0c>] (stop_machine) from [<c010f9b0>] (patch_text+0x2c/0x34)
[   11.978208]  r7:c12658c4 r6:c0a16b14 r5:c0a4eff8 r4:c01c6f38
[   11.983867] [<c010f984>] (patch_text) from [<c010f79c>] (arch_jump_label_transform+0x28/0x44)
[   11.992387] [<c010f774>] (arch_jump_label_transform) from [<c01f3bf8>] (__jump_label_update+0x94/0x9c)
[   12.001681]  r5:c0a4eff8 r4:c0a4ebf0
[   12.005259] [<c01f3b64>] (__jump_label_update) from [<c01f42ec>] (jump_label_update+0x94/0x130)
[   12.013948]  r7:c12658c4 r6:00000000 r5:c0a16b14 r4:c0a4eff8
[   12.019606] [<c01f4258>] (jump_label_update) from [<c01f43ec>] (__static_key_slow_dec+0x64/0xac)
[   12.028382]  r7:c12658c4 r6:00000000 r5:00000000 r4:c0a16b14
[   12.034040] [<c01f4388>] (__static_key_slow_dec) from [<c01f446c>] (static_key_slow_dec+0x38/0x64)
[   12.042990]  r7:c12658c4 r6:c0a17458 r5:eeaa6000 r4:c0a16b14
[   12.048647] [<c01f4434>] (static_key_slow_dec) from [<c01f44cc>] (static_key_disable+0x34/0x68)
[   12.057335]  r5:eeaa6000 r4:c0a16b14
[   12.060913] [<c01f4498>] (static_key_disable) from [<c01bdb54>] (rebind_subsystems+0x320/0x3fc)
[   12.069601]  r5:eeaa6000 r4:eeaa6010
[   12.073179] [<c01bd834>] (rebind_subsystems) from [<c01bdd84>] (cgroup_setup_root+0x154/0x2c8)
[   12.081784]  r10:c0a164e0 r9:eeaa6018 r8:c0a16a94 r7:00000000 r6:eeaa6000 r5:eeb85dd0
[   12.089603]  r4:eeaa6010
[   12.092140] [<c01bdc30>] (cgroup_setup_root) from [<c01c2f54>] (cgroup1_mount+0x62c/0x848)
[   12.100398]  r10:c0a1661c r9:00000001 r8:c0a16aac r7:00000000 r6:c12657f0 r5:eeaa6000
[   12.108216]  r4:c0a16904
[   12.110755] [<c01c2928>] (cgroup1_mount) from [<c01bc4bc>] (cgroup_mount+0xc8/0x430)
[   12.118492]  r10:00000000 r9:ef238000 r8:c0a16a30 r7:c0a169b0 r6:c0a16a30 r5:eea7a880
[   12.126311]  r4:c0a07584
[   12.128851] [<c01bc3f4>] (cgroup_mount) from [<c024e6a0>] (mount_fs+0x1c/0xac)
[   12.136069]  r10:00000000 r9:ef238000 r8:c0a16a30 r7:c0273b70 r6:c0a16a30 r5:eea7a880
[   12.143887]  r4:c01bc3f4
[   12.146427] [<c024e684>] (mount_fs) from [<c026ff04>] (vfs_kern_mount+0x5c/0x130)
[   12.153903]  r6:00000000 r5:eea7a880 r4:eea42700
[   12.158522] [<c026fea8>] (vfs_kern_mount) from [<c0273b70>] (do_mount+0x164/0xc98)
[   12.166086]  r9:eea7a2c0 r8:c0274a50 r7:eea7a880 r6:00000027 r5:ef238000 r4:c0a16a30
[   12.173822] [<c0273a0c>] (do_mount) from [<c0274a50>] (SyS_mount+0x94/0xbc)
[   12.180781]  r10:00000000 r9:eeb84000 r8:c0ed000e r7:010ec1b0 r6:ef238000 r5:eea7a2c0
[   12.188599]  r4:eea7a880
[   12.191139] [<c02749bc>] (SyS_mount) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c)
[   12.198703]  r8:c0108084 r7:00000015 r6:010ec1a0 r5:00000000 r4:010ec170

Regards

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