On Fri, Jul 22, 2016 at 02:19:40PM +0200, Jan Kara wrote:
> Currently PTE gets updated in wp_pfn_shared() after dax_pfn_mkwrite()
> has released corresponding radix tree entry lock. When we want to
> writeprotect PTE on cache flush, we need PTE modification to happen
> under radix tree entry lock to ensure consisten updates of PTE and radix
> tree (standard faults use page lock to ensure this consistency). So move
> update of PTE bit into dax_pfn_mkwrite().
>
> Signed-off-by: Jan Kara <[email protected]>
After applying the whole series to a v4.7 baseline I was hitting a deadlock in
my testing, and it bisected to this commit. This deadlock happens in my QEMU
guest with generic/068, ext4 and DAX. It reproduces 100% of the time after
this commit.
Here is the lockdep info, passed through kasan_symbolize.py:
run fstests generic/068 at 2016-07-25 15:29:10
EXT4-fs (pmem0p2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
EXT4-fs (pmem0p2): mounted filesystem with ordered data mode. Opts: dax
======================================================
[ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
4.7.0+ #1 Not tainted
------------------------------------------------------
fstest/1856 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
(&(ptlock_ptr(page))->rlock#2){+.+...}, at: [< inline >] spin_lock
include/linux/spinlock.h:302
(&(ptlock_ptr(page))->rlock#2){+.+...}, at: [<ffffffff8121c0b7>]
finish_mkwrite_fault+0xa7/0x120 mm/memory.c:2286
and this task is already holding:
(&(&mapping->tree_lock)->rlock){-.-...}, at: [< inline >]
spin_lock_irq include/linux/spinlock.h:332
(&(&mapping->tree_lock)->rlock){-.-...}, at: [<ffffffff812d5086>]
dax_pfn_mkwrite+0x36/0x90 fs/dax.c:1280
which would create a new lock dependency:
(&(&mapping->tree_lock)->rlock){-.-...} ->
(&(ptlock_ptr(page))->rlock#2){+.+...}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&(&mapping->tree_lock)->rlock){-.-...}
... which became HARDIRQ-irq-safe at:
[< inline >] mark_irqflags kernel/locking/lockdep.c:2912
[<ffffffff8110a236>] __lock_acquire+0x706/0x14b0 kernel/locking/lockdep.c:3287
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0 kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:112
[<ffffffff81ad02ff>] _raw_spin_lock_irqsave+0x4f/0x90
kernel/locking/spinlock.c:159
[<ffffffff811f2a27>] test_clear_page_writeback+0x67/0x2a0
mm/page-writeback.c:2737
[<ffffffff811de81f>] end_page_writeback+0x1f/0xa0 mm/filemap.c:858
[<ffffffff812b9495>] end_buffer_async_write+0xc5/0x180 fs/buffer.c:375
[<ffffffff812b8338>] end_bio_bh_io_sync+0x28/0x40 fs/buffer.c:2936
[<ffffffff81575907>] bio_endio+0x57/0x60 block/bio.c:1758
[<ffffffff818915fc>] dec_pending+0x21c/0x340 drivers/md/dm.c:1015
[<ffffffff818922a6>] clone_endio+0x76/0xe0 drivers/md/dm.c:1059
[<ffffffff81575907>] bio_endio+0x57/0x60 block/bio.c:1758
[< inline >] req_bio_endio block/blk-core.c:155
[<ffffffff8157f072>] blk_update_request+0xa2/0x3c0 block/blk-core.c:2644
[<ffffffff8158998a>] blk_mq_end_request+0x1a/0x70 block/blk-mq.c:320
[<ffffffff8177bcdf>] virtblk_request_done+0x3f/0x70
drivers/block/virtio_blk.c:131
[<ffffffff81588983>] __blk_mq_complete_request_remote+0x13/0x20
block/blk-mq.c:330
[<ffffffff8114bebf>] flush_smp_call_function_queue+0x5f/0x150 kernel/smp.c:249
[<ffffffff8114c903>] generic_smp_call_function_single_interrupt+0x13/0x60
kernel/smp.c:194
[< inline >] __smp_call_function_single_interrupt
arch/x86/kernel/smp.c:311
[<ffffffff810575a7>] smp_call_function_single_interrupt+0x27/0x40
arch/x86/kernel/smp.c:318
[<ffffffff81ad1926>] call_function_single_interrupt+0x96/0xa0
arch/x86/entry/entry_64.S:639
[< inline >] raw_spin_unlock_irq_rcu_node kernel/rcu/tree.h:718
[< inline >] rcu_gp_init kernel/rcu/tree.c:1934
[<ffffffff8112a5f7>] rcu_gp_kthread+0x157/0x8f0 kernel/rcu/tree.c:2175
[<ffffffff810d59e6>] kthread+0xf6/0x110 kernel/kthread.c:209
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:389
to a HARDIRQ-irq-unsafe lock:
(&(ptlock_ptr(page))->rlock#2){+.+...}
... which became HARDIRQ-irq-unsafe at:
... [< inline >] mark_irqflags kernel/locking/lockdep.c:2929
... [<ffffffff8110a0f1>] __lock_acquire+0x5c1/0x14b0
kernel/locking/lockdep.c:3287
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0 kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70 kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[< inline >] do_anonymous_page mm/memory.c:2823
[< inline >] handle_pte_fault mm/memory.c:3378
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121ea5c>] handle_mm_fault+0x196c/0x1d60 mm/memory.c:3534
[< inline >] faultin_page mm/gup.c:378
[<ffffffff8121829a>] __get_user_pages+0x18a/0x760 mm/gup.c:577
[< inline >] __get_user_pages_locked mm/gup.c:754
[<ffffffff81218c84>] get_user_pages_remote+0x54/0x60 mm/gup.c:962
[< inline >] get_arg_page fs/exec.c:206
[<ffffffff81280bcf>] copy_strings.isra.21+0x15f/0x3e0 fs/exec.c:521
[<ffffffff81280e84>] copy_strings_kernel+0x34/0x40 fs/exec.c:566
[<ffffffff812815fa>] do_execveat_common.isra.36+0x57a/0x970 fs/exec.c:1690
[<ffffffff81281a1c>] do_execve+0x2c/0x30 fs/exec.c:1747
[<ffffffff810c9f80>] call_usermodehelper_exec_async+0xf0/0x140
kernel/kmod.c:252
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40 arch/x86/entry/entry_64.S:389
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(ptlock_ptr(page))->rlock#2);
local_irq_disable();
lock(&(&mapping->tree_lock)->rlock);
lock(&(ptlock_ptr(page))->rlock#2);
<Interrupt>
lock(&(&mapping->tree_lock)->rlock);
*** DEADLOCK ***
4 locks held by fstest/1856:
#0: (&mm->mmap_sem){++++++}, at: [<ffffffff81070ad2>]
__do_page_fault+0x152/0x4c0 arch/x86/mm/fault.c:1295
#1: (sb_pagefaults){++++..}, at: [<ffffffff8127c854>]
__sb_start_write+0xb4/0xf0 fs/super.c:1197
#2: (&ei->i_mmap_sem){++++.+}, at: [<ffffffff8131cd04>]
ext4_dax_pfn_mkwrite+0x54/0xa0 fs/ext4/file.c:273
#3: (&(&mapping->tree_lock)->rlock){-.-...}, at: [< inline >]
spin_lock_irq include/linux/spinlock.h:332
#3: (&(&mapping->tree_lock)->rlock){-.-...}, at: [<ffffffff812d5086>]
dax_pfn_mkwrite+0x36/0x90 fs/dax.c:1280
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&(&mapping->tree_lock)->rlock){-.-...} ops: 605595 {
IN-HARDIRQ-W at:
[< inline >] mark_irqflags
kernel/locking/lockdep.c:2912
[<ffffffff8110a236>] __lock_acquire+0x706/0x14b0
kernel/locking/lockdep.c:3287
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0
kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:112
[<ffffffff81ad02ff>] _raw_spin_lock_irqsave+0x4f/0x90
kernel/locking/spinlock.c:159
[<ffffffff811f2a27>] test_clear_page_writeback+0x67/0x2a0
mm/page-writeback.c:2737
[<ffffffff811de81f>] end_page_writeback+0x1f/0xa0
mm/filemap.c:858
[<ffffffff812b9495>] end_buffer_async_write+0xc5/0x180
fs/buffer.c:375
[<ffffffff812b8338>] end_bio_bh_io_sync+0x28/0x40
fs/buffer.c:2936
[<ffffffff81575907>] bio_endio+0x57/0x60 block/bio.c:1758
[<ffffffff818915fc>] dec_pending+0x21c/0x340
drivers/md/dm.c:1015
[<ffffffff818922a6>] clone_endio+0x76/0xe0
drivers/md/dm.c:1059
[<ffffffff81575907>] bio_endio+0x57/0x60 block/bio.c:1758
[< inline >] req_bio_endio block/blk-core.c:155
[<ffffffff8157f072>] blk_update_request+0xa2/0x3c0
block/blk-core.c:2644
[<ffffffff8158998a>] blk_mq_end_request+0x1a/0x70
block/blk-mq.c:320
[<ffffffff8177bcdf>] virtblk_request_done+0x3f/0x70
drivers/block/virtio_blk.c:131
[<ffffffff81588983>]
__blk_mq_complete_request_remote+0x13/0x20 block/blk-mq.c:330
[<ffffffff8114bebf>]
flush_smp_call_function_queue+0x5f/0x150 kernel/smp.c:249
[<ffffffff8114c903>]
generic_smp_call_function_single_interrupt+0x13/0x60 kernel/smp.c:194
[< inline >] __smp_call_function_single_interrupt
arch/x86/kernel/smp.c:311
[<ffffffff810575a7>]
smp_call_function_single_interrupt+0x27/0x40 arch/x86/kernel/smp.c:318
[<ffffffff81ad1926>]
call_function_single_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:639
[< inline >] raw_spin_unlock_irq_rcu_node
kernel/rcu/tree.h:718
[< inline >] rcu_gp_init kernel/rcu/tree.c:1934
[<ffffffff8112a5f7>] rcu_gp_kthread+0x157/0x8f0
kernel/rcu/tree.c:2175
[<ffffffff810d59e6>] kthread+0xf6/0x110 kernel/kthread.c:209
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40
arch/x86/entry/entry_64.S:389
IN-SOFTIRQ-W at:
[< inline >] mark_irqflags
kernel/locking/lockdep.c:2915
[<ffffffff8110a0cf>] __lock_acquire+0x59f/0x14b0
kernel/locking/lockdep.c:3287
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0
kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:112
[<ffffffff81ad02ff>] _raw_spin_lock_irqsave+0x4f/0x90
kernel/locking/spinlock.c:159
[<ffffffff811f2a27>] test_clear_page_writeback+0x67/0x2a0
mm/page-writeback.c:2737
[<ffffffff811de81f>] end_page_writeback+0x1f/0xa0
mm/filemap.c:858
[<ffffffff8132cc89>] ext4_finish_bio+0x159/0x1e0
fs/ext4/page-io.c:119
[<ffffffff8132d09f>] ext4_end_bio+0x4f/0x100
fs/ext4/page-io.c:333
[<ffffffff81575907>] bio_endio+0x57/0x60 block/bio.c:1758
[<ffffffff818915fc>] dec_pending+0x21c/0x340
drivers/md/dm.c:1015
[<ffffffff818922a6>] clone_endio+0x76/0xe0
drivers/md/dm.c:1059
[<ffffffff81575907>] bio_endio+0x57/0x60 block/bio.c:1758
[< inline >] req_bio_endio block/blk-core.c:155
[<ffffffff8157f072>] blk_update_request+0xa2/0x3c0
block/blk-core.c:2644
[<ffffffff8158998a>] blk_mq_end_request+0x1a/0x70
block/blk-mq.c:320
[<ffffffff8177bcdf>] virtblk_request_done+0x3f/0x70
drivers/block/virtio_blk.c:131
[< inline >] blk_mq_ipi_complete_request
block/blk-mq.c:354
[<ffffffff81589b48>] __blk_mq_complete_request+0x78/0xf0
block/blk-mq.c:366
[<ffffffff81589bdc>] blk_mq_complete_request+0x1c/0x20
block/blk-mq.c:385
[<ffffffff8177b543>] virtblk_done+0x73/0x100
drivers/block/virtio_blk.c:147
[<ffffffff816800ac>] vring_interrupt+0x3c/0x90
drivers/virtio/virtio_ring.c:892
[<ffffffff8111fa81>] handle_irq_event_percpu+0x41/0x330
kernel/irq/handle.c:145
[<ffffffff8111fda9>] handle_irq_event+0x39/0x60
kernel/irq/handle.c:192
[<ffffffff811232c4>] handle_edge_irq+0x74/0x130
kernel/irq/chip.c:623
[< inline >] generic_handle_irq_desc
include/linux/irqdesc.h:147
[<ffffffff81036103>] handle_irq+0x73/0x120
arch/x86/kernel/irq_64.c:78
[<ffffffff81ad2f81>] do_IRQ+0x61/0x120
arch/x86/kernel/irq.c:240
[<ffffffff81ad0e16>] ret_from_intr+0x0/0x20
arch/x86/entry/entry_64.S:482
[< inline >] invoke_softirq kernel/softirq.c:350
[<ffffffff810b6dff>] irq_exit+0x10f/0x120
kernel/softirq.c:391
[< inline >] exiting_irq
./arch/x86/include/asm/apic.h:658
[<ffffffff81ad3082>] smp_apic_timer_interrupt+0x42/0x50
arch/x86/kernel/apic/apic.c:932
[<ffffffff81ad11a6>] apic_timer_interrupt+0x96/0xa0
arch/x86/entry/entry_64.S:618
[< inline >] rcu_lock_acquire
include/linux/rcupdate.h:486
[< inline >] rcu_read_lock_sched
include/linux/rcupdate.h:971
[< inline >] percpu_ref_get_many
include/linux/percpu-refcount.h:174
[< inline >] percpu_ref_get
include/linux/percpu-refcount.h:194
[< inline >] blk_queue_enter_live block/blk.h:85
[<ffffffff8158b06a>] blk_mq_map_request+0x5a/0x440
block/blk-mq.c:1175
[<ffffffff8158c275>] blk_sq_make_request+0xa5/0x500
block/blk-mq.c:1364
[<ffffffff8157e816>] generic_make_request+0xf6/0x2a0
block/blk-core.c:2076
[<ffffffff8157ea36>] submit_bio+0x76/0x170
block/blk-core.c:2139
[<ffffffff8132d25f>] ext4_io_submit+0x2f/0x40
fs/ext4/page-io.c:345
[< inline >] io_submit_add_bh fs/ext4/page-io.c:385
[<ffffffff8132d428>] ext4_bio_write_page+0x198/0x3c0
fs/ext4/page-io.c:495
[<ffffffff8132205d>] mpage_submit_page+0x5d/0x80
fs/ext4/inode.c:2091
[<ffffffff8132217b>] mpage_process_page_bufs+0xfb/0x110
fs/ext4/inode.c:2196
[<ffffffff81323662>]
mpage_prepare_extent_to_map+0x202/0x300 fs/ext4/inode.c:2575
[<ffffffff81327988>] ext4_writepages+0x618/0x1020
fs/ext4/inode.c:2736
[<ffffffff811f2661>] do_writepages+0x21/0x30
mm/page-writeback.c:2364
[<ffffffff811e12a6>] __filemap_fdatawrite_range+0xc6/0x100
mm/filemap.c:300
[<ffffffff811e1424>] filemap_write_and_wait_range+0x44/0x90
mm/filemap.c:490
[<ffffffff8131dc1e>] ext4_sync_file+0x9e/0x4a0
fs/ext4/fsync.c:115
[<ffffffff812b545b>] vfs_fsync_range+0x4b/0xb0 fs/sync.c:195
[< inline >] vfs_fsync fs/sync.c:209
[<ffffffff812b551d>] do_fsync+0x3d/0x70 fs/sync.c:219
[< inline >] SYSC_fsync fs/sync.c:227
[<ffffffff812b57d0>] SyS_fsync+0x10/0x20 fs/sync.c:225
[<ffffffff81003fa7>] do_syscall_64+0x67/0x190
arch/x86/entry/common.c:350
[<ffffffff81ad053f>] return_from_SYSCALL_64+0x0/0x7a
arch/x86/entry/entry_64.S:248
INITIAL USE at:
[<ffffffff81109daf>] __lock_acquire+0x27f/0x14b0
kernel/locking/lockdep.c:3291
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0
kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock_irq
include/linux/spinlock_api_smp.h:130
[<ffffffff81acfa03>] _raw_spin_lock_irq+0x43/0x80
kernel/locking/spinlock.c:167
[< inline >] spin_lock_irq
include/linux/spinlock.h:332
[<ffffffff811dfb9e>] __add_to_page_cache_locked+0x13e/0x500
mm/filemap.c:653
[<ffffffff811dffce>] add_to_page_cache_lru+0x4e/0xe0
mm/filemap.c:702
[<ffffffff811e012e>] pagecache_get_page+0xce/0x300
mm/filemap.c:1208
[<ffffffff811e0389>] grab_cache_page_write_begin+0x29/0x40
mm/filemap.c:2581
[<ffffffff812a7ee8>] simple_write_begin+0x28/0x1b0
fs/libfs.c:428
[<ffffffff811dd80f>] pagecache_write_begin+0x1f/0x30
mm/filemap.c:2484
[<ffffffff81284220>] __page_symlink+0xc0/0x100
fs/namei.c:4720
[<ffffffff81284282>] page_symlink+0x22/0x30 fs/namei.c:4743
[<ffffffff8138e71a>] ramfs_symlink+0x4a/0xc0
fs/ramfs/inode.c:129
[<ffffffff812859bc>] vfs_symlink+0xac/0x110 fs/namei.c:4071
[< inline >] SYSC_symlinkat fs/namei.c:4098
[< inline >] SyS_symlinkat fs/namei.c:4078
[< inline >] SYSC_symlink fs/namei.c:4111
[<ffffffff8128bbc0>] SyS_symlink+0x80/0xf0 fs/namei.c:4109
[<ffffffff825b4e53>] do_symlink+0x4d/0x90
init/initramfs.c:393
[<ffffffff825b4c5f>] write_buffer+0x23/0x34
init/initramfs.c:417
[<ffffffff825b4c9b>] flush_buffer+0x2b/0x85
init/initramfs.c:429
[<ffffffff825ff590>] __gunzip+0x27e/0x322
lib/decompress_inflate.c:147
[<ffffffff825ff645>] gunzip+0x11/0x13
lib/decompress_inflate.c:193
[<ffffffff825b560b>] unpack_to_rootfs+0x17e/0x294
init/initramfs.c:485
[<ffffffff825b58f7>] populate_rootfs+0x5c/0xfc
init/initramfs.c:617
[<ffffffff81002190>] do_one_initcall+0x50/0x190
init/main.c:772
[< inline >] do_initcall_level init/main.c:837
[< inline >] do_initcalls init/main.c:845
[< inline >] do_basic_setup init/main.c:863
[<ffffffff825b320f>] kernel_init_freeable+0x1f6/0x290
init/main.c:1010
[<ffffffff81ac0f1e>] kernel_init+0xe/0x100 init/main.c:936
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40
arch/x86/entry/entry_64.S:389
}
... key at: [<ffffffff8355c9a0>] __key.44708+0x0/0x8 ??:?
... acquired at:
[<ffffffff81108bcb>] check_irq_usage+0x4b/0xb0 kernel/locking/lockdep.c:1620
[< inline >] check_prev_add_irq kernel/locking/lockdep_states.h:7
[< inline >] check_prev_add kernel/locking/lockdep.c:1828
[< inline >] check_prevs_add kernel/locking/lockdep.c:1934
[< inline >] validate_chain kernel/locking/lockdep.c:2261
[<ffffffff8110a972>] __lock_acquire+0xe42/0x14b0
kernel/locking/lockdep.c:3330
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0 kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70 kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[<ffffffff8121c0b7>] finish_mkwrite_fault+0xa7/0x120 mm/memory.c:2286
[<ffffffff812d50b5>] dax_pfn_mkwrite+0x65/0x90 fs/dax.c:1290
[<ffffffff8131cd4b>] ext4_dax_pfn_mkwrite+0x9b/0xa0 fs/ext4/file.c:278
[< inline >] wp_pfn_shared mm/memory.c:2317
[<ffffffff8121c643>] do_wp_page+0x513/0x760 mm/memory.c:2403
[< inline >] handle_pte_fault mm/memory.c:3397
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121e102>] handle_mm_fault+0x1012/0x1d60 mm/memory.c:3534
[<ffffffff81070b5e>] __do_page_fault+0x1de/0x4c0 arch/x86/mm/fault.c:1356
[<ffffffff81070f1c>] trace_do_page_fault+0x5c/0x280 arch/x86/mm/fault.c:1449
[<ffffffff8106af7a>] do_async_page_fault+0x1a/0xa0 arch/x86/kernel/kvm.c:265
[<ffffffff81ad2708>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:923
the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
-> (&(ptlock_ptr(page))->rlock#2){+.+...} ops: 921722 {
HARDIRQ-ON-W at:
[< inline >] mark_irqflags
kernel/locking/lockdep.c:2929
[<ffffffff8110a0f1>] __lock_acquire+0x5c1/0x14b0
kernel/locking/lockdep.c:3287
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0
kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock
include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70
kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[< inline >] do_anonymous_page mm/memory.c:2823
[< inline >] handle_pte_fault mm/memory.c:3378
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121ea5c>] handle_mm_fault+0x196c/0x1d60
mm/memory.c:3534
[< inline >] faultin_page mm/gup.c:378
[<ffffffff8121829a>] __get_user_pages+0x18a/0x760
mm/gup.c:577
[< inline >] __get_user_pages_locked mm/gup.c:754
[<ffffffff81218c84>] get_user_pages_remote+0x54/0x60
mm/gup.c:962
[< inline >] get_arg_page fs/exec.c:206
[<ffffffff81280bcf>] copy_strings.isra.21+0x15f/0x3e0
fs/exec.c:521
[<ffffffff81280e84>] copy_strings_kernel+0x34/0x40
fs/exec.c:566
[<ffffffff812815fa>] do_execveat_common.isra.36+0x57a/0x970
fs/exec.c:1690
[<ffffffff81281a1c>] do_execve+0x2c/0x30 fs/exec.c:1747
[<ffffffff810c9f80>]
call_usermodehelper_exec_async+0xf0/0x140 kernel/kmod.c:252
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40
arch/x86/entry/entry_64.S:389
SOFTIRQ-ON-W at:
[< inline >] mark_irqflags
kernel/locking/lockdep.c:2933
[<ffffffff8110a11f>] __lock_acquire+0x5ef/0x14b0
kernel/locking/lockdep.c:3287
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0
kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock
include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70
kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[< inline >] do_anonymous_page mm/memory.c:2823
[< inline >] handle_pte_fault mm/memory.c:3378
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121ea5c>] handle_mm_fault+0x196c/0x1d60
mm/memory.c:3534
[< inline >] faultin_page mm/gup.c:378
[<ffffffff8121829a>] __get_user_pages+0x18a/0x760
mm/gup.c:577
[< inline >] __get_user_pages_locked mm/gup.c:754
[<ffffffff81218c84>] get_user_pages_remote+0x54/0x60
mm/gup.c:962
[< inline >] get_arg_page fs/exec.c:206
[<ffffffff81280bcf>] copy_strings.isra.21+0x15f/0x3e0
fs/exec.c:521
[<ffffffff81280e84>] copy_strings_kernel+0x34/0x40
fs/exec.c:566
[<ffffffff812815fa>] do_execveat_common.isra.36+0x57a/0x970
fs/exec.c:1690
[<ffffffff81281a1c>] do_execve+0x2c/0x30 fs/exec.c:1747
[<ffffffff810c9f80>]
call_usermodehelper_exec_async+0xf0/0x140 kernel/kmod.c:252
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40
arch/x86/entry/entry_64.S:389
INITIAL USE at:
[<ffffffff81109daf>] __lock_acquire+0x27f/0x14b0
kernel/locking/lockdep.c:3291
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0
kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock
include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70
kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[< inline >] do_anonymous_page mm/memory.c:2823
[< inline >] handle_pte_fault mm/memory.c:3378
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121ea5c>] handle_mm_fault+0x196c/0x1d60
mm/memory.c:3534
[< inline >] faultin_page mm/gup.c:378
[<ffffffff8121829a>] __get_user_pages+0x18a/0x760
mm/gup.c:577
[< inline >] __get_user_pages_locked mm/gup.c:754
[<ffffffff81218c84>] get_user_pages_remote+0x54/0x60
mm/gup.c:962
[< inline >] get_arg_page fs/exec.c:206
[<ffffffff81280bcf>] copy_strings.isra.21+0x15f/0x3e0
fs/exec.c:521
[<ffffffff81280e84>] copy_strings_kernel+0x34/0x40
fs/exec.c:566
[<ffffffff812815fa>] do_execveat_common.isra.36+0x57a/0x970
fs/exec.c:1690
[<ffffffff81281a1c>] do_execve+0x2c/0x30 fs/exec.c:1747
[<ffffffff810c9f80>]
call_usermodehelper_exec_async+0xf0/0x140 kernel/kmod.c:252
[<ffffffff81ad06af>] ret_from_fork+0x1f/0x40
arch/x86/entry/entry_64.S:389
}
... key at: [<ffffffff8279cc18>] __key.17932+0x0/0x8 ??:?
... acquired at:
[<ffffffff81108bcb>] check_irq_usage+0x4b/0xb0 kernel/locking/lockdep.c:1620
[< inline >] check_prev_add_irq kernel/locking/lockdep_states.h:7
[< inline >] check_prev_add kernel/locking/lockdep.c:1828
[< inline >] check_prevs_add kernel/locking/lockdep.c:1934
[< inline >] validate_chain kernel/locking/lockdep.c:2261
[<ffffffff8110a972>] __lock_acquire+0xe42/0x14b0
kernel/locking/lockdep.c:3330
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0 kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70 kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[<ffffffff8121c0b7>] finish_mkwrite_fault+0xa7/0x120 mm/memory.c:2286
[<ffffffff812d50b5>] dax_pfn_mkwrite+0x65/0x90 fs/dax.c:1290
[<ffffffff8131cd4b>] ext4_dax_pfn_mkwrite+0x9b/0xa0 fs/ext4/file.c:278
[< inline >] wp_pfn_shared mm/memory.c:2317
[<ffffffff8121c643>] do_wp_page+0x513/0x760 mm/memory.c:2403
[< inline >] handle_pte_fault mm/memory.c:3397
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121e102>] handle_mm_fault+0x1012/0x1d60 mm/memory.c:3534
[<ffffffff81070b5e>] __do_page_fault+0x1de/0x4c0 arch/x86/mm/fault.c:1356
[<ffffffff81070f1c>] trace_do_page_fault+0x5c/0x280 arch/x86/mm/fault.c:1449
[<ffffffff8106af7a>] do_async_page_fault+0x1a/0xa0 arch/x86/kernel/kvm.c:265
[<ffffffff81ad2708>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:923
stack backtrace:
CPU: 0 PID: 1856 Comm: fstest Not tainted 4.7.0+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014
0000000000000086 0000000070a78a50 ffff8800a768f9a8 ffffffff815b20a3
ffffffff82ec47f0 0000000000000030 ffff8800a768fac0 ffffffff81108b29
0000000000000000 0000000000000000 0000000000000001 000000000d3ea148
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff815b20a3>] dump_stack+0x85/0xc2 lib/dump_stack.c:51
[< inline >] print_bad_irq_dependency kernel/locking/lockdep.c:1532
[<ffffffff81108b29>] check_usage+0x539/0x590 kernel/locking/lockdep.c:1564
[<ffffffff81108bcb>] check_irq_usage+0x4b/0xb0 kernel/locking/lockdep.c:1620
[< inline >] check_prev_add_irq kernel/locking/lockdep_states.h:7
[< inline >] check_prev_add kernel/locking/lockdep.c:1828
[< inline >] check_prevs_add kernel/locking/lockdep.c:1934
[< inline >] validate_chain kernel/locking/lockdep.c:2261
[<ffffffff8110a972>] __lock_acquire+0xe42/0x14b0 kernel/locking/lockdep.c:3330
[<ffffffff8110b490>] lock_acquire+0xf0/0x1d0 kernel/locking/lockdep.c:3741
[< inline >] __raw_spin_lock include/linux/spinlock_api_smp.h:144
[<ffffffff81acf796>] _raw_spin_lock+0x36/0x70 kernel/locking/spinlock.c:151
[< inline >] spin_lock include/linux/spinlock.h:302
[<ffffffff8121c0b7>] finish_mkwrite_fault+0xa7/0x120 mm/memory.c:2286
[<ffffffff812d50b5>] dax_pfn_mkwrite+0x65/0x90 fs/dax.c:1290
[<ffffffff8131cd4b>] ext4_dax_pfn_mkwrite+0x9b/0xa0 fs/ext4/file.c:278
[< inline >] wp_pfn_shared mm/memory.c:2317
[<ffffffff8121c643>] do_wp_page+0x513/0x760 mm/memory.c:2403
[< inline >] handle_pte_fault mm/memory.c:3397
[< inline >] __handle_mm_fault mm/memory.c:3505
[<ffffffff8121e102>] handle_mm_fault+0x1012/0x1d60 mm/memory.c:3534
[<ffffffff81070b5e>] __do_page_fault+0x1de/0x4c0 arch/x86/mm/fault.c:1356
[<ffffffff81070f1c>] trace_do_page_fault+0x5c/0x280 arch/x86/mm/fault.c:1449
[<ffffffff8106af7a>] do_async_page_fault+0x1a/0xa0 arch/x86/kernel/kvm.c:265
[<ffffffff81ad2708>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:923
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