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Date: Tue, 21 Nov 2017 19:53:29 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: dri-devel@...ts.freedesktop.org
Cc: Daniel Vetter <daniel.vetter@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Sean Paul <seanpaul@...omium.org>,
David Airlie <airlied@...ux.ie>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org, lkp@...org
Subject: [vga_arb_device_init] WARNING: possible circular locking dependency
detected
Hello,
FYI this happens in mainline kernel 4.14.0-12891-gc8a0739.
It looks like a new regression after 4.14.
It occurs in 1 out of 2 boots.
[ 79.460969] run-job /lkp/scheduled/vm-lkp-wsx03-yocto-x86_64-18/trinity-300s-yocto-minimal-x86_64-2016-04-22.cgz-c8a0739b185d11d6e2ca7ad9f5835841d1cfc765-20171120-97995-o5usht-0.yaml
[ 79.460969] /bin/busybox wget -q http://inn:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/scheduled/vm-lkp-wsx03-yocto-x86_64-18/trinity-300s-yocto-minimal-x86_64-2016-04-22.cgz-c8a0739b185d11d6e2ca7ad9f5835841d1cfc765-20171120-97995-o5usht-0.yaml&job_state=running -O /dev/null
[ 80.864966] Seeding trinity based on x86_64-allyesdebian
[ 91.375399]
[ 91.380720] ======================================================
[ 91.394163] WARNING: possible circular locking dependency detected
[ 91.407453] 4.14.0-12891-gc8a0739 #14 Not tainted
[ 91.417852] ------------------------------------------------------
[ 91.431493] trinity/648 is trying to acquire lock:
[ 91.442608] (misc_mtx){+.+.}, at: [<ffffffffb59c099b>] misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 91.583377]
[ 91.583377] but task is already holding lock:
[ 91.603418] (&p->lock){+.+.}, at: [<ffffffffb5252d01>] seq_read+0x3a/0x341:
seq_read at fs/seq_file.c:178
[ 91.613890]
[ 91.613890] which lock already depends on the new lock.
[ 91.613890]
[ 91.627926]
[ 91.627926] the existing dependency chain (in reverse order) is:
[ 91.639723]
[ 91.639723] -> #3 (&p->lock){+.+.}:
[ 91.649763] __mutex_lock+0x83/0x3cc:
__mutex_lock_common at kernel/locking/mutex.c:758
(inlined by) __mutex_lock at kernel/locking/mutex.c:893
[ 91.657191] seq_read+0x3a/0x341:
seq_read at fs/seq_file.c:178
[ 91.665614] proc_reg_read+0x5a/0x71:
proc_reg_read at fs/proc/inode.c:217
[ 91.672805] do_loop_readv_writev+0x65/0x9b:
do_loop_readv_writev at fs/read_write.c:673
[ 91.682458] do_iter_read+0x83/0x9e:
do_iter_read at fs/read_write.c:899
[ 91.689986] vfs_readv+0x71/0x9f:
vfs_readv at fs/read_write.c:960
[ 91.696981] default_file_splice_read+0x20a/0x2a5:
set_fs at arch/x86/include/asm/uaccess.h:32
(inlined by) kernel_readv at fs/splice.c:362
(inlined by) default_file_splice_read at fs/splice.c:416
[ 91.706631] splice_direct_to_actor+0xc4/0x198:
splice_direct_to_actor at fs/splice.c:953
[ 91.714215] do_splice_direct+0x8e/0xa2:
do_splice_direct at fs/splice.c:1062
[ 91.722327] do_sendfile+0x172/0x22e:
do_sendfile at fs/read_write.c:1414
[ 91.730159] SyS_sendfile64+0x85/0x94
[ 91.739616] entry_SYSCALL_64_fastpath+0x1f/0x96:
entry_SYSCALL_64_fastpath at arch/x86/entry/entry_64.S:206
[ 91.749981]
[ 91.749981] -> #2 (sb_writers){.+.+}:
[ 91.761322] get_page_from_freelist+0x4e9/0xa18:
rmqueue at mm/page_alloc.c:2877
(inlined by) get_page_from_freelist at mm/page_alloc.c:3216
[ 91.771794]
[ 91.771794] -> #1 ((completion)&req.done){+.+.}:
[ 91.787011] __wait_for_common+0x55/0x1fe:
spin_lock_irq at include/linux/spinlock.h:340
(inlined by) __wait_for_common at kernel/sched/completion.c:111
[ 91.796573] devtmpfs_create_node+0x139/0x155:
devtmpfs_create_node at drivers/base/devtmpfs.c:117
[ 91.806749] device_add+0x3b3/0x4ec:
device_add at drivers/base/core.c:1830
[ 91.815072] device_create_groups_vargs+0x98/0xca:
device_create_groups_vargs at drivers/base/core.c:2431
[ 91.825957] device_create_with_groups+0x30/0x33:
device_create_with_groups at drivers/base/core.c:2552
[ 91.836527] misc_register+0xb8/0x13f:
misc_register at drivers/char/misc.c:221
[ 91.845436] vga_arb_device_init+0x1f/0x219:
vga_arb_device_init at drivers/gpu/vga/vgaarb.c:1485
[ 91.855096] do_one_initcall+0x89/0x129:
do_one_initcall at init/main.c:826
[ 91.864269] kernel_init_freeable+0x1c0/0x241:
do_initcall_level at init/main.c:892
(inlined by) do_initcalls at init/main.c:900
(inlined by) do_basic_setup at init/main.c:918
(inlined by) kernel_init_freeable at init/main.c:1066
[ 91.874443] kernel_init+0xa/0xf5:
kernel_init at init/main.c:995
[ 91.882739] ret_from_fork+0x24/0x30:
ret_from_fork at arch/x86/entry/entry_64.S:443
[ 91.891353]
[ 91.891353] -> #0 (misc_mtx){+.+.}:
[ 91.902179] lock_acquire+0x128/0x1ca:
get_current at arch/x86/include/asm/current.h:15
(inlined by) lock_acquire at kernel/locking/lockdep.c:4006
[ 91.911192] __mutex_lock+0x83/0x3cc:
__mutex_lock_common at kernel/locking/mutex.c:758
(inlined by) __mutex_lock at kernel/locking/mutex.c:893
[ 91.919812] misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 91.929008] seq_read+0x14d/0x341:
seq_read at fs/seq_file.c:229
[ 91.937209] proc_reg_read+0x5a/0x71:
proc_reg_read at fs/proc/inode.c:217
[ 91.945795] __vfs_read+0x21/0x9f:
__vfs_read at fs/read_write.c:411
[ 91.954124] vfs_read+0xad/0xe2:
vfs_read at fs/read_write.c:448
[ 91.962029] SyS_read+0x50/0x7e
[ 91.970173] entry_SYSCALL_64_fastpath+0x1f/0x96:
entry_SYSCALL_64_fastpath at arch/x86/entry/entry_64.S:206
[ 91.977844]
[ 91.977844] other info that might help us debug this:
[ 91.977844]
[ 91.988643] Chain exists of:
[ 91.988643] misc_mtx --> sb_writers --> &p->lock
[ 91.988643]
[ 92.000927] Possible unsafe locking scenario:
[ 92.000927]
[ 92.009081] CPU0 CPU1
[ 92.015152] ---- ----
[ 92.021367] lock(&p->lock);
[ 92.025806] lock(sb_writers);
[ 92.033201] lock(&p->lock);
[ 92.044927] lock(misc_mtx);
[ 92.052352]
[ 92.052352] *** DEADLOCK ***
[ 92.052352]
[ 92.066900] 1 lock held by trinity/648:
[ 92.088647] #0: (&p->lock){+.+.}, at: [<ffffffffb5252d01>] seq_read+0x3a/0x341:
seq_read at fs/seq_file.c:178
[ 92.105431]
[ 92.105431] stack backtrace:
[ 92.117324] CPU: 0 PID: 648 Comm: trinity Not tainted 4.14.0-12891-gc8a0739 #14
[ 92.133653] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 92.151902] Call Trace:
[ 92.158542] dump_stack+0x79/0xab:
dump_stack at lib/dump_stack.c:55
[ 92.166772] print_circular_bug+0x2a1/0x2af:
print_circular_bug at kernel/locking/lockdep.c:1274
[ 92.176535] check_prev_add+0x88/0x217:
check_prev_add at kernel/locking/lockdep.c:1914
[ 92.185666] ? look_up_lock_class+0xa1/0x11f:
look_up_lock_class at kernel/locking/lockdep.c:726 (discriminator 1)
[ 92.195517] ? look_up_lock_class+0x11f/0x11f:
save_trace at kernel/locking/lockdep.c:413
[ 92.205657] ? register_lock_class+0x5c/0x302:
IS_ERR_OR_NULL at include/linux/err.h:41 (discriminator 13)
(inlined by) register_lock_class at kernel/locking/lockdep.c:770 (discriminator 13)
[ 92.215608] ? look_up_lock_class+0x11f/0x11f:
save_trace at kernel/locking/lockdep.c:413
[ 92.225824] ? __lock_acquire+0xacc/0xd02:
check_prevs_add at kernel/locking/lockdep.c:2033
(inlined by) validate_chain at kernel/locking/lockdep.c:2473
(inlined by) __lock_acquire at kernel/locking/lockdep.c:3500
[ 92.235379] __lock_acquire+0xacc/0xd02:
check_prevs_add at kernel/locking/lockdep.c:2033
(inlined by) validate_chain at kernel/locking/lockdep.c:2473
(inlined by) __lock_acquire at kernel/locking/lockdep.c:3500
[ 92.244544] ? misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 92.253918] lock_acquire+0x128/0x1ca:
get_current at arch/x86/include/asm/current.h:15
(inlined by) lock_acquire at kernel/locking/lockdep.c:4006
[ 92.262735] ? misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 92.271938] __mutex_lock+0x83/0x3cc:
__mutex_lock_common at kernel/locking/mutex.c:758
(inlined by) __mutex_lock at kernel/locking/mutex.c:893
[ 92.280484] ? misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 92.289659] ? misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 92.298867] ? rcu_read_lock_sched_held+0x54/0x5a:
rcu_read_lock_sched_held at kernel/rcu/update.c:118
[ 92.309588] ? kmem_cache_alloc_node_trace+0x196/0x237:
trace_kmalloc_node at include/trace/events/kmem.h:100
(inlined by) kmem_cache_alloc_node_trace at mm/slab.c:3657
[ 92.321089] ? kvmalloc_node+0x48/0x71:
kvmalloc_node at mm/util.c:403
[ 92.330136] ? misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 92.339271] misc_seq_start+0x17/0x27:
misc_seq_start at drivers/char/misc.c:70
[ 92.348154] seq_read+0x14d/0x341:
seq_read at fs/seq_file.c:229
[ 92.356313] proc_reg_read+0x5a/0x71:
proc_reg_read at fs/proc/inode.c:217
[ 92.365128] __vfs_read+0x21/0x9f:
__vfs_read at fs/read_write.c:411
[ 92.373262] vfs_read+0xad/0xe2:
vfs_read at fs/read_write.c:448
[ 92.381178] SyS_read+0x50/0x7e
[ 92.389117] entry_SYSCALL_64_fastpath+0x1f/0x96:
entry_SYSCALL_64_fastpath at arch/x86/entry/entry_64.S:206
[ 92.399616] RIP: 0033:0x454d00
[ 92.407193] RSP: 002b:00007ffe38245f68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 92.424140] RAX: ffffffffffffffda RBX: 0000000000000046 RCX: 0000000000454d00
[ 92.439443] RDX: 0000000000000400 RSI: 00000000022c0440 RDI: 0000000000000004
[ 92.454869] RBP: 00000000004e2720 R08: 0000000001046108 R09: 0000000000000410
[ 92.470254] R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000000
[ 92.485615] R13: 00000000004b7c09 R14: 0000000000000001 R15: 00000000004b7c19
[ 148.722159] do_dccp_setsockopt: sockopt(CHANGE_L/R) is deprecated: fix your app
[ 148.756602] kernel msg: ebtables bug: please report to author: Wrong len argument
[ 148.773493] trinity-main uses obsolete (PF_INET,SOCK_PACKET)
Attached the full dmesg, kconfig and reproduce scripts.
Thanks,
Fengguang
View attachment "dmesg-vm-lkp-wsx03-yocto-x86_64-18:20171120165752:x86_64-allyesdebian:4.14.0-12891-gc8a0739:14" of type "text/plain" (106919 bytes)
View attachment ".config" of type "text/plain" (164866 bytes)
View attachment "job-script" of type "text/plain" (3861 bytes)
View attachment "reproduce-vm-lkp-wsx03-yocto-x86_64-18:20171120165752:x86_64-allyesdebian:4.14.0-12891-gc8a0739:14" of type "text/plain" (2049 bytes)
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