Hi,
We are using yaffs2 on a custom medical device for about a couple of years now without problems.
We want to implement a new feature consisting of upgrading the whole system with an usb stick holding the new rootfs. For that I created a ramdisk and from there we do the following (as explained in
http://www.ronetix.at/wiki.davincidsp.com/Put_YAFFS_Image_to_Flash.html#Writing_a_Tarball_Image)
target$ flash_eraseall /dev/mtd3
target$ mount -t yaffs2 /dev/mtdblock3 /mnt
target$ cd /mnt
target$ tar xzf <imagedir>/rootfs.tar.gz
The rootfs is about 90Mb (I forgot, we are using a 3.0 kernel).
When untarring we get some deadlock problems. This is always reproducible, I mean we have not been able to do the untar and umount succesfully, either one or the other fails with a deadlock problem. I copy the traces below. The first problem is related with kswapd. I saw in the archives a similar report by Reed Lawson but it is from 2005 and relates to 2.x kernels. Of course there is no problem if we upgrade the rootfs from u-boot with nand write.yaffs.
We’d appreciate any insight on this.
Thanks.
/mnt/rootfs/rootfs.tmp # tar xf /mnt/ramdisk/rootfs.yaffs2.tar.gz
[ 514.446044]
[ 514.446075] =========================================================
[ 514.454406] [ INFO: possible irq lock inversion dependency detected ]
[ 514.461151] 3.0.101-BSP-dm37x-2.4-4 #7
[ 514.465087] ---------------------------------------------------------
[ 514.471862] kswapd0/23 just changed the state of lock:
[ 514.477233] (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.}, at: [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 514.487792] but this lock took another, RECLAIM_FS-unsafe lock in the past:
[ 514.495086] (mtd_table_mutex){+.+.+.}
[ 514.498840]
[ 514.498840] and interrupts could create inverse lock ordering between them.
[ 514.498840]
[ 514.509429]
[ 514.509460] other info that might help us debug this:
[ 514.516296] Possible interrupt unsafe locking scenario:
[ 514.516296]
[ 514.523437] CPU0 CPU1
[ 514.528198] ---- ----
[ 514.532928] lock(mtd_table_mutex);
[ 514.536682] local_irq_disable();
[ 514.542907] lock(&(yaffs_dev_to_lc(dev)->gross_lock));
[ 514.551116] lock(mtd_table_mutex);
[ 514.557525] <Interrupt>
[ 514.560272] lock(&(yaffs_dev_to_lc(dev)->gross_lock));
[ 514.566040]
[ 514.566040] *** DEADLOCK ***
[ 514.566040]
[ 514.572265] 2 locks held by kswapd0/23:
[ 514.576293] #0: (shrinker_rwsem){++++..}, at: [<c0177c8c>] shrink_slab+0x2c/0x500
[ 514.584350] #1: (iprune_sem){++++.-}, at: [<c01b71f4>] shrink_icache_memory+0x40/0x36c
[ 514.592864]
[ 514.592864] the shortest dependencies between 2nd lock and 1st lock:
[ 514.601104] -> (mtd_table_mutex){+.+.+.} ops: 13 {
[ 514.606231] HARDIRQ-ON-W at:
[ 514.609619] [<c0131200>] __lock_acquire+0x9f8/0x1b04
[ 514.618591] [<c0132938>] lock_acquire+0xa0/0x124
[ 514.627197] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 514.636230] [<c0380084>] register_mtd_user+0x1c/0x78
[ 514.645202] [<c002690c>] init_mtdchar+0xc0/0xec
[ 514.653717] [<c00b5360>] do_one_initcall+0x34/0x174
[ 514.662597] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 514.671081] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 514.679962] SOFTIRQ-ON-W at:
[ 514.683349] [<c0131224>] __lock_acquire+0xa1c/0x1b04
[ 514.692321] [<c0132938>] lock_acquire+0xa0/0x124
[ 514.700897] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 514.709960] [<c0380084>] register_mtd_user+0x1c/0x78
[ 514.718902] [<c002690c>] init_mtdchar+0xc0/0xec
[ 514.727416] [<c00b5360>] do_one_initcall+0x34/0x174
[ 514.736297] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 514.744781] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 514.753662] RECLAIM_FS-ON-W at:
[ 514.757324] [<c0133180>] mark_held_locks+0x4c/0x84
[ 514.766357] [<c013382c>] lockdep_trace_alloc+0x90/0xf4
[ 514.775787] [<c019bd8c>] kmem_cache_alloc_trace+0x30/0x15c
[ 514.785552] [<c02c8a48>] register_blkdev+0x78/0x164
[ 514.794708] [<c0385cb0>] register_mtd_blktrans+0x38/0x124
[ 514.804382] [<c00b5360>] do_one_initcall+0x34/0x174
[ 514.813537] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 514.822296] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 514.831451] INITIAL USE at:
[ 514.834747] [<c0130b5c>] __lock_acquire+0x354/0x1b04
[ 514.843597] [<c0132938>] lock_acquire+0xa0/0x124
[ 514.852111] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 514.861083] [<c0380084>] register_mtd_user+0x1c/0x78
[ 514.869934] [<c002690c>] init_mtdchar+0xc0/0xec
[ 514.878356] [<c00b5360>] do_one_initcall+0x34/0x174
[ 514.887115] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 514.895538] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 514.904296] }
[ 514.906127] ... key at: [<c0971690>] mtd_table_mutex+0x40/0x58
[ 514.912902] ... acquired at:
[ 514.916107] [<c0132938>] lock_acquire+0xa0/0x124
[ 514.921234] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 514.926818] [<c0380140>] put_mtd_device+0x18/0x30
[ 514.932037] [<c0288210>] yaffs_put_super+0x9c/0x140
[ 514.937438] [<c01a0c38>] generic_shutdown_super+0x84/0x100
[ 514.943450] [<c01a0ccc>] kill_block_super+0x18/0x68
[ 514.948852] [<c01a12d4>] deactivate_locked_super+0x40/0x58
[ 514.954895] [<c01bb3cc>] sys_umount+0x6c/0x360
[ 514.959838] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 514.965148]
[ 514.966705] -> (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.} ops: 90267 {
[ 514.973846] HARDIRQ-ON-W at:
[ 514.977142] [<c0131200>] __lock_acquire+0x9f8/0x1b04
[ 514.985931] [<c0132938>] lock_acquire+0xa0/0x124
[ 514.994323] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 515.003204] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 515.012512] [<c028960c>] yaffs_internal_read_super.isra.10+0x888/0xda4
[ 515.022949] [<c0289b40>] yaffs2_internal_read_super_mtd+0x18/0x28
[ 515.032897] [<c01a1694>] mount_bdev+0x174/0x1a0
[ 515.041229] [<c0285f1c>] yaffs2_mount+0x18/0x20
[ 515.049560] [<c01a1e54>] mount_fs+0x44/0x18c
[ 515.057586] [<c01ba664>] vfs_kern_mount+0x4c/0x8c
[ 515.066101] [<c01ba7bc>] do_kern_mount+0x34/0xd4
[ 515.074493] [<c01bbf18>] do_mount+0x2f0/0x718
[ 515.082641] [<c01bc618>] sys_mount+0x84/0xc4
[ 515.090698] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 515.099273] SOFTIRQ-ON-W at:
[ 515.102569] [<c0131224>] __lock_acquire+0xa1c/0x1b04
[ 515.111358] [<c0132938>] lock_acquire+0xa0/0x124
[ 515.119750] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 515.128631] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 515.137939] [<c028960c>] yaffs_internal_read_super.isra.10+0x888/0xda4
[ 515.148376] [<c0289b40>] yaffs2_internal_read_super_mtd+0x18/0x28
[ 515.158325] [<c01a1694>] mount_bdev+0x174/0x1a0
[ 515.166656] [<c0285f1c>] yaffs2_mount+0x18/0x20
[ 515.174957] [<c01a1e54>] mount_fs+0x44/0x18c
[ 515.183013] [<c01ba664>] vfs_kern_mount+0x4c/0x8c
[ 515.191528] [<c01ba7bc>] do_kern_mount+0x34/0xd4
[ 515.199920] [<c01bbf18>] do_mount+0x2f0/0x718
[ 515.208068] [<c01bc618>] sys_mount+0x84/0xc4
[ 515.216094] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 515.224700] IN-RECLAIM_FS-W at:
[ 515.228271] [<c01312d8>] __lock_acquire+0xad0/0x1b04
[ 515.237335] [<c0132938>] lock_acquire+0xa0/0x124
[ 515.246002] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 515.255126] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 515.264739] [<c0288310>] yaffs_evict_inode+0x5c/0x100
[ 515.273864] [<c01b6b48>] evict+0x70/0x170
[ 515.281921] [<c01b6c7c>] dispose_list+0x34/0x44
[ 515.290527] [<c01b7324>] shrink_icache_memory+0x170/0x36c
[ 515.300018] [<c0177df4>] shrink_slab+0x194/0x500
[ 515.308715] [<c017b370>] kswapd+0x9f4/0xe30
[ 515.316925] [<c011adfc>] kthread+0x84/0x88
[ 515.325073] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 515.334045] INITIAL USE at:
[ 515.337249] [<c0130b5c>] __lock_acquire+0x354/0x1b04
[ 515.345916] [<c0132938>] lock_acquire+0xa0/0x124
[ 515.354248] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 515.363006] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 515.372253] [<c028960c>] yaffs_internal_read_super.isra.10+0x888/0xda4
[ 515.382568] [<c0289b40>] yaffs2_internal_read_super_mtd+0x18/0x28
[ 515.392456] [<c01a1694>] mount_bdev+0x174/0x1a0
[ 515.400665] [<c0285f1c>] yaffs2_mount+0x18/0x20
[ 515.408905] [<c01a1e54>] mount_fs+0x44/0x18c
[ 515.416870] [<c01ba664>] vfs_kern_mount+0x4c/0x8c
[ 515.425262] [<c01ba7bc>] do_kern_mount+0x34/0xd4
[ 515.433593] [<c01bbf18>] do_mount+0x2f0/0x718
[ 515.441650] [<c01bc618>] sys_mount+0x84/0xc4
[ 515.449584] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 515.458099] }
[ 515.459838] ... key at: [<c0f25f5c>] __key.25088+0x0/0x8
[ 515.465972] ... acquired at:
[ 515.469085] [<c012f850>] check_usage_forwards+0x138/0x14c
[ 515.475036] [<c01302f8>] mark_lock+0x1e4/0x6f4
[ 515.479980] [<c01312d8>] __lock_acquire+0xad0/0x1b04
[ 515.485443] [<c0132938>] lock_acquire+0xa0/0x124
[ 515.490570] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 515.496154] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 515.502197] [<c0288310>] yaffs_evict_inode+0x5c/0x100
[ 515.507781] [<c01b6b48>] evict+0x70/0x170
[ 515.512268] [<c01b6c7c>] dispose_list+0x34/0x44
[ 515.517303] [<c01b7324>] shrink_icache_memory+0x170/0x36c
[ 515.523223] [<c0177df4>] shrink_slab+0x194/0x500
[ 515.528350] [<c017b370>] kswapd+0x9f4/0xe30
[ 515.533020] [<c011adfc>] kthread+0x84/0x88
[ 515.537597] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 515.542999]
[ 515.544555]
[ 515.544555] stack backtrace:
[ 515.549133] [<c00c710c>] (unwind_backtrace+0x0/0x138) from [<c012f6d4>] (prin
[ 515.560302] [<c012f6d4>] (print_irq_inversion_bug.part.34+0x1e4/0x228) from [
[ 515.571990] [<c012f850>] (check_usage_forwards+0x138/0x14c) from [<c01302f8>]
[ 515.581695] [<c01302f8>] (mark_lock+0x1e4/0x6f4) from [<c01312d8>] (__lock_ac
[ 515.590911] [<c01312d8>] (__lock_acquire+0xad0/0x1b04) from [<c0132938>] (loc
[ 515.600341] [<c0132938>] (lock_acquire+0xa0/0x124) from [<c05c6304>] (mutex_l
[ 515.609832] [<c05c6304>] (mutex_lock_nested+0x74/0x300) from [<c0286744>] (ya
[ 515.620269] [<c0286744>] (yaffs_gross_lock.isra.2+0x2c/0x78) from [<c0288310>
[ 515.630676] [<c0288310>] (yaffs_evict_inode+0x5c/0x100) from [<c01b6b48>] (ev
[ 515.639556] [<c01b6b48>] (evict+0x70/0x170) from [<c01b6c7c>] (dispose_list+0
[ 515.647857] [<c01b6c7c>] (dispose_list+0x34/0x44) from [<c01b7324>] (shrink_i
[ 515.657653] [<c01b7324>] (shrink_icache_memory+0x170/0x36c) from [<c0177df4>]
[ 515.667510] [<c0177df4>] (shrink_slab+0x194/0x500) from [<c017b370>] (kswapd+
[ 515.676116] [<c017b370>] (kswapd+0x9f4/0xe30) from [<c011adfc>] (kthread+0x84
[ 515.684173] [<c011adfc>] (kthread+0x84/0x88) from [<c00c1e00>] (kernel_thread
/mnt/rootfs/rootfs.tmp #
/mnt/usb # tar xf rootfs.yaffs2.tar.gz -C /mnt/rootfs/
/mnt/usb # #Notice that tar ends ok.
/mnt/usb # umount /mnt/rootfs/
[ 1054.577423]
[ 1054.577453] ======================================================
[ 1054.585601] [ INFO: RECLAIM_FS-safe -> RECLAIM_FS-unsafe lock order detected ]
[ 1054.593231] 3.0.101-BSP-dm37x-2.4-4 #7
[ 1054.597198] ------------------------------------------------------
[ 1054.603759] umount/95 [HC0[0]:SC0[0]:HE1:SE1] is trying to acquire:
[ 1054.610412] (mtd_table_mutex){+.+.+.}, at: [<c0380140>] put_mtd_device+0x18/0x30
[ 1054.618408]
[ 1054.618408] and this task is already holding:
[ 1054.624603] (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.}, at: [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1054.635223] which would create a new lock dependency:
[ 1054.640594] (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.} -> (mtd_table_mutex){+.+.+.}
[ 1054.649108]
[ 1054.649108] but this new dependency connects a RECLAIM_FS-irq-safe lock:
[ 1054.657775] (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.}
[ 1054.663421] ... which became RECLAIM_FS-irq-safe at:
[ 1054.668853] [<c01312d8>] __lock_acquire+0xad0/0x1b04
[ 1054.674346] [<c0132938>] lock_acquire+0xa0/0x124
[ 1054.679443] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1054.684997] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1054.691009] [<c0288310>] yaffs_evict_inode+0x5c/0x100
[ 1054.696563] [<c01b6b48>] evict+0x70/0x170
[ 1054.701019] [<c01b6c7c>] dispose_list+0x34/0x44
[ 1054.706024] [<c01b7324>] shrink_icache_memory+0x170/0x36c
[ 1054.711944] [<c0177df4>] shrink_slab+0x194/0x500
[ 1054.717041] [<c017b994>] try_to_free_pages+0x1e8/0x3ec
[ 1054.722686] [<c016f870>] __alloc_pages_nodemask+0x418/0x6a0
[ 1054.728790] [<c0172370>] __do_page_cache_readahead+0x33c/0x718
[ 1054.735168] [<c0172a00>] ra_submit+0x28/0x30
[ 1054.739898] [<c016998c>] generic_file_aio_read+0x5ac/0x804
[ 1054.745910] [<c019e8b8>] do_sync_read+0xa4/0xe4
[ 1054.750915] [<c019f01c>] vfs_read+0xa4/0x134
[ 1054.755645] [<c019f0ec>] sys_read+0x40/0x6c
[ 1054.760284] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1054.765563]
[ 1054.765563] to a RECLAIM_FS-irq-unsafe lock:
[ 1054.771667] (mtd_table_mutex){+.+.+.}
[ 1054.775451] ... which became RECLAIM_FS-irq-unsafe at:
[ 1054.781097] ... [<c0133180>] mark_held_locks+0x4c/0x84
[ 1054.786651] [<c013382c>] lockdep_trace_alloc+0x90/0xf4
[ 1054.792297] [<c019bd8c>] kmem_cache_alloc_trace+0x30/0x15c
[ 1054.798309] [<c02c8a48>] register_blkdev+0x78/0x164
[ 1054.803710] [<c0385cb0>] register_mtd_blktrans+0x38/0x124
[ 1054.809631] [<c00b5360>] do_one_initcall+0x34/0x174
[ 1054.815002] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 1054.820007] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 1054.825378]
[ 1054.825378] other info that might help us debug this:
[ 1054.825408]
[ 1054.833862] Possible interrupt unsafe locking scenario:
[ 1054.833892]
[ 1054.841064] CPU0 CPU1
[ 1054.845855] ---- ----
[ 1054.850646] lock(mtd_table_mutex);
[ 1054.854461] local_irq_disable();
[ 1054.860717] lock(&(yaffs_dev_to_lc(dev)->gross_lock));
[ 1054.869049] lock(mtd_table_mutex);
[ 1054.875518] <Interrupt>
[ 1054.878295] lock(&(yaffs_dev_to_lc(dev)->gross_lock));
[ 1054.884124]
[ 1054.884124] *** DEADLOCK ***
[ 1054.884124]
[ 1054.890411] 2 locks held by umount/95:
[ 1054.894378] #0: (&type->s_umount_key#19){++++..}, at: [<c01a17bc>] deactivate_super+0x50/0x60
[ 1054.903656] #1: (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.}, at: [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1054.914764]
[ 1054.914764] the dependencies between RECLAIM_FS-irq-safe lock and the holding lock:
[ 1054.924499] -> (&(yaffs_dev_to_lc(dev)->gross_lock)){+.+.-.} ops: 124451 {
[ 1054.931823] HARDIRQ-ON-W at:
[ 1054.935180] [<c0131200>] __lock_acquire+0x9f8/0x1b04
[ 1054.944030] [<c0132938>] lock_acquire+0xa0/0x124
[ 1054.952545] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1054.961486] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1054.970916] [<c028960c>] yaffs_internal_read_super.isra.10+0x888/0xda4
[ 1054.981445] [<c0289b40>] yaffs2_internal_read_super_mtd+0x18/0x28
[ 1054.991485] [<c01a1694>] mount_bdev+0x174/0x1a0
[ 1054.999908] [<c0285f1c>] yaffs2_mount+0x18/0x20
[ 1055.008300] [<c01a1e54>] mount_fs+0x44/0x18c
[ 1055.016448] [<c01ba664>] vfs_kern_mount+0x4c/0x8c
[ 1055.025024] [<c01ba7bc>] do_kern_mount+0x34/0xd4
[ 1055.033538] [<c01bbf18>] do_mount+0x2f0/0x718
[ 1055.041748] [<c01bc618>] sys_mount+0x84/0xc4
[ 1055.049896] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1055.058563] SOFTIRQ-ON-W at:
[ 1055.061889] [<c0131224>] __lock_acquire+0xa1c/0x1b04
[ 1055.070770] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.079254] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.088226] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1055.097656] [<c028960c>] yaffs_internal_read_super.isra.10+0x888/0xda4
[ 1055.108154] [<c0289b40>] yaffs2_internal_read_super_mtd+0x18/0x28
[ 1055.118225] [<c01a1694>] mount_bdev+0x174/0x1a0
[ 1055.126647] [<c0285f1c>] yaffs2_mount+0x18/0x20
[ 1055.135040] [<c01a1e54>] mount_fs+0x44/0x18c
[ 1055.143157] [<c01ba664>] vfs_kern_mount+0x4c/0x8c
[ 1055.151763] [<c01ba7bc>] do_kern_mount+0x34/0xd4
[ 1055.160247] [<c01bbf18>] do_mount+0x2f0/0x718
[ 1055.168457] [<c01bc618>] sys_mount+0x84/0xc4
[ 1055.176605] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1055.185272] IN-RECLAIM_FS-W at:
[ 1055.188903] [<c01312d8>] __lock_acquire+0xad0/0x1b04
[ 1055.198028] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.206817] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.216033] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1055.225738] [<c0288310>] yaffs_evict_inode+0x5c/0x100
[ 1055.234954] [<c01b6b48>] evict+0x70/0x170
[ 1055.243103] [<c01b6c7c>] dispose_list+0x34/0x44
[ 1055.251770] [<c01b7324>] shrink_icache_memory+0x170/0x36c
[ 1055.261383] [<c0177df4>] shrink_slab+0x194/0x500
[ 1055.270141] [<c017b994>] try_to_free_pages+0x1e8/0x3ec
[ 1055.279479] [<c016f870>] __alloc_pages_nodemask+0x418/0x6a0
[ 1055.289245] [<c0172370>] __do_page_cache_readahead+0x33c/0x718
[ 1055.299316] [<c0172a00>] ra_submit+0x28/0x30
[ 1055.307708] [<c016998c>] generic_file_aio_read+0x5ac/0x804
[ 1055.317413] [<c019e8b8>] do_sync_read+0xa4/0xe4
[ 1055.326080] [<c019f01c>] vfs_read+0xa4/0x134
[ 1055.334472] [<c019f0ec>] sys_read+0x40/0x6c
[ 1055.342803] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1055.351745] INITIAL USE at:
[ 1055.354980] [<c0130b5c>] __lock_acquire+0x354/0x1b04
[ 1055.363769] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.372161] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.381042] [<c0286744>] yaffs_gross_lock.isra.2+0x2c/0x78
[ 1055.390350] [<c028960c>] yaffs_internal_read_super.isra.10+0x888/0xda4
[ 1055.400787] [<c0289b40>] yaffs2_internal_read_super_mtd+0x18/0x28
[ 1055.410766] [<c01a1694>] mount_bdev+0x174/0x1a0
[ 1055.419067] [<c0285f1c>] yaffs2_mount+0x18/0x20
[ 1055.427398] [<c01a1e54>] mount_fs+0x44/0x18c
[ 1055.435424] [<c01ba664>] vfs_kern_mount+0x4c/0x8c
[ 1055.443939] [<c01ba7bc>] do_kern_mount+0x34/0xd4
[ 1055.452331] [<c01bbf18>] do_mount+0x2f0/0x718
[ 1055.460449] [<c01bc618>] sys_mount+0x84/0xc4
[ 1055.468505] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1055.477081] }
[ 1055.478851] ... key at: [<c0f25f5c>] __key.25088+0x0/0x8
[ 1055.485046] ... acquired at:
[ 1055.488189] [<c012ffe4>] check_irq_usage+0x58/0xb4
[ 1055.493560] [<c01316d8>] __lock_acquire+0xed0/0x1b04
[ 1055.499114] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.504302] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.509948] [<c0380140>] put_mtd_device+0x18/0x30
[ 1055.515228] [<c0288210>] yaffs_put_super+0x9c/0x140
[ 1055.520690] [<c01a0c38>] generic_shutdown_super+0x84/0x100
[ 1055.526794] [<c01a0ccc>] kill_block_super+0x18/0x68
[ 1055.532257] [<c01a12d4>] deactivate_locked_super+0x40/0x58
[ 1055.538360] [<c01bb3cc>] sys_umount+0x6c/0x360
[ 1055.543365] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1055.548736]
[ 1055.550323]
[ 1055.550323] the dependencies between the lock to be acquired and RECLAIM_FS-irq-unsafe lock:
[ 1055.560852] -> (mtd_table_mutex){+.+.+.} ops: 14 {
[ 1055.565979] HARDIRQ-ON-W at:
[ 1055.569305] [<c0131200>] __lock_acquire+0x9f8/0x1b04
[ 1055.578186] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.586669] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.595642] [<c0380084>] register_mtd_user+0x1c/0x78
[ 1055.604492] [<c002690c>] init_mtdchar+0xc0/0xec
[ 1055.612915] [<c00b5360>] do_one_initcall+0x34/0x174
[ 1055.621704] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 1055.630096] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 1055.638854] SOFTIRQ-ON-W at:
[ 1055.642211] [<c0131224>] __lock_acquire+0xa1c/0x1b04
[ 1055.651062] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.659576] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.668518] [<c0380084>] register_mtd_user+0x1c/0x78
[ 1055.677398] [<c002690c>] init_mtdchar+0xc0/0xec
[ 1055.685791] [<c00b5360>] do_one_initcall+0x34/0x174
[ 1055.694549] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 1055.702972] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 1055.711730] RECLAIM_FS-ON-W at:
[ 1055.715362] [<c0133180>] mark_held_locks+0x4c/0x84
[ 1055.724304] [<c013382c>] lockdep_trace_alloc+0x90/0xf4
[ 1055.733642] [<c019bd8c>] kmem_cache_alloc_trace+0x30/0x15c
[ 1055.743316] [<c02c8a48>] register_blkdev+0x78/0x164
[ 1055.752380] [<c0385cb0>] register_mtd_blktrans+0x38/0x124
[ 1055.761993] [<c00b5360>] do_one_initcall+0x34/0x174
[ 1055.771026] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 1055.779693] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 1055.788757] INITIAL USE at:
[ 1055.791992] [<c0130b5c>] __lock_acquire+0x354/0x1b04
[ 1055.800781] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.809173] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.818054] [<c0380084>] register_mtd_user+0x1c/0x78
[ 1055.826812] [<c002690c>] init_mtdchar+0xc0/0xec
[ 1055.835144] [<c00b5360>] do_one_initcall+0x34/0x174
[ 1055.843811] [<c0008b3c>] kernel_init+0xa4/0x13c
[ 1055.852111] [<c00c1e00>] kernel_thread_exit+0x0/0x8
[ 1055.860809] }
[ 1055.862579] ... key at: [<c0971690>] mtd_table_mutex+0x40/0x58
[ 1055.869323] ... acquired at:
[ 1055.872467] [<c012ffe4>] check_irq_usage+0x58/0xb4
[ 1055.877838] [<c01316d8>] __lock_acquire+0xed0/0x1b04
[ 1055.883392] [<c0132938>] lock_acquire+0xa0/0x124
[ 1055.888580] [<c05c6304>] mutex_lock_nested+0x74/0x300
[ 1055.894226] [<c0380140>] put_mtd_device+0x18/0x30
[ 1055.899505] [<c0288210>] yaffs_put_super+0x9c/0x140
[ 1055.904968] [<c01a0c38>] generic_shutdown_super+0x84/0x100
[ 1055.911071] [<c01a0ccc>] kill_block_super+0x18/0x68
[ 1055.916534] [<c01a12d4>] deactivate_locked_super+0x40/0x58
[ 1055.922637] [<c01bb3cc>] sys_umount+0x6c/0x360
[ 1055.927642] [<c00c0f00>] ret_fast_syscall+0x0/0x3c
[ 1055.933013]
[ 1055.934600]
[ 1055.934600] stack backtrace:
[ 1055.939239] [<c00c710c>] (unwind_backtrace+0x0/0x138) from [<c012fe30>] (check_usage+0x47c/0x5d8)
[ 1055.948669] [<c012fe30>] (check_usage+0x47c/0x5d8) from [<c012ffe4>] (check_irq_usage+0x58/0xb4)
[ 1055.958007] [<c012ffe4>] (check_irq_usage+0x58/0xb4) from [<c01316d8>] (__lock_acquire+0xed0/0x1b04)
[ 1055.967712] [<c01316d8>] (__lock_acquire+0xed0/0x1b04) from [<c0132938>] (lock_acquire+0xa0/0x124)
[ 1055.977233] [<c0132938>] (lock_acquire+0xa0/0x124) from [<c05c6304>] (mutex_lock_nested+0x74/0x300)
[ 1055.986816] [<c05c6304>] (mutex_lock_nested+0x74/0x300) from [<c0380140>] (put_mtd_device+0x18/0x30)
[ 1055.996520] [<c0380140>] (put_mtd_device+0x18/0x30) from [<c0288210>] (yaffs_put_super+0x9c/0x140)
[ 1056.006042] [<c0288210>] (yaffs_put_super+0x9c/0x140) from [<c01a0c38>] (generic_shutdown_super+0x84/0x100)
[ 1056.016387] [<c01a0c38>] (generic_shutdown_super+0x84/0x100) from [<c01a0ccc>] (kill_block_super+0x18/0x68)
[ 1056.026733] [<c01a0ccc>] (kill_block_super+0x18/0x68) from [<c01a12d4>] (deactivate_locked_super+0x40/0x58)
[ 1056.037048] [<c01a12d4>] (deactivate_locked_super+0x40/0x58) from [<c01bb3cc>] (sys_umount+0x6c/0x360)
[ 1056.046936] [<c01bb3cc>] (sys_umount+0x6c/0x360) from [<c00c0f00>] (ret_fast_syscall+0x0/0x3c)
(text/plain)