From: Chao Yu <yuchao0@xxxxxxxxxx>
generic/361 reports below warning, this is because: once, there is
someone entering into critical region of sbi.cp_lock, if write_end_io.
f2fs_stop_checkpoint is invoked from an triggered IRQ, we will encounter
deadlock.
So this patch changes to use spin_{,un}lock_irq{save,restore} to create
critical region without IRQ enabled to avoid potential deadlock.
irq event stamp: 83391573
loop: Write error at byte offset 438729728, length 1024.
hardirqs last enabled at (83391573): [<c1809752>] restore_all+0xf/0x65
hardirqs last disabled at (83391572): [<c1809eac>] reschedule_interrupt+0x30/0x3c
loop: Write error at byte offset 438860288, length 1536.
softirqs last enabled at (83389244): [<c180cc4e>] __do_softirq+0x1ae/0x476
softirqs last disabled at (83389237): [<c101ca7c>] do_softirq_own_stack+0x2c/0x40
loop: Write error at byte offset 438990848, length 2048.
================================
WARNING: inconsistent lock state
4.12.0-rc2+ #30 Tainted: G O
--------------------------------
inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
xfs_io/7959 [HC1[1]:SC0[0]:HE0:SE1] takes:
(&(&sbi->cp_lock)->rlock){?.+...}, at: [<f96f96cc>] f2fs_stop_checkpoint+0x1c/0x50 [f2fs]
{HARDIRQ-ON-W} state was registered at:
__lock_acquire+0x527/0x7b0
lock_acquire+0xae/0x220
_raw_spin_lock+0x42/0x50
do_checkpoint+0x165/0x9e0 [f2fs]
write_checkpoint+0x33f/0x740 [f2fs]
__f2fs_sync_fs+0x92/0x1f0 [f2fs]
f2fs_sync_fs+0x12/0x20 [f2fs]
sync_filesystem+0x67/0x80
generic_shutdown_super+0x27/0x100
kill_block_super+0x22/0x50
kill_f2fs_super+0x3a/0x40 [f2fs]
deactivate_locked_super+0x3d/0x70
deactivate_super+0x40/0x60
cleanup_mnt+0x39/0x70
__cleanup_mnt+0x10/0x20
task_work_run+0x69/0x80
exit_to_usermode_loop+0x57/0x85
do_fast_syscall_32+0x18c/0x1b0
entry_SYSENTER_32+0x4c/0x7b
irq event stamp: 1957420
hardirqs last enabled at (1957419): [<c1808f37>] _raw_spin_unlock_irq+0x27/0x50
hardirqs last disabled at (1957420): [<c1809f9c>] call_function_single_interrupt+0x30/0x3c
softirqs last enabled at (1953784): [<c180cc4e>] __do_softirq+0x1ae/0x476
softirqs last disabled at (1953773): [<c101ca7c>] do_softirq_own_stack+0x2c/0x40
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&(&sbi->cp_lock)->rlock);
<Interrupt>
lock(&(&sbi->cp_lock)->rlock);
*** DEADLOCK ***
2 locks held by xfs_io/7959:
#0: (sb_writers#13){.+.+.+}, at: [<c11fd7ca>] vfs_write+0x16a/0x190
#1: (&sb->s_type->i_mutex_key#16){+.+.+.}, at: [<f96e33f5>] f2fs_file_write_iter+0x25/0x140 [f2fs]
stack backtrace:
CPU: 2 PID: 7959 Comm: xfs_io Tainted: G O 4.12.0-rc2+ #30
Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
Call Trace:
dump_stack+0x5f/0x92
print_usage_bug+0x1d3/0x1dd
? check_usage_backwards+0xe0/0xe0
mark_lock+0x23d/0x280
__lock_acquire+0x699/0x7b0
? __this_cpu_preempt_check+0xf/0x20
? trace_hardirqs_off_caller+0x91/0xe0
lock_acquire+0xae/0x220
? f2fs_stop_checkpoint+0x1c/0x50 [f2fs]
_raw_spin_lock+0x42/0x50
? f2fs_stop_checkpoint+0x1c/0x50 [f2fs]
f2fs_stop_checkpoint+0x1c/0x50 [f2fs]
f2fs_write_end_io+0x147/0x150 [f2fs]
bio_endio+0x7a/0x1e0
blk_update_request+0xad/0x410
blk_mq_end_request+0x16/0x60
lo_complete_rq+0x3c/0x70
__blk_mq_complete_request_remote+0x11/0x20
flush_smp_call_function_queue+0x6d/0x120
? debug_smp_processor_id+0x12/0x20
generic_smp_call_function_single_interrupt+0x12/0x30
smp_call_function_single_interrupt+0x25/0x40
call_function_single_interrupt+0x37/0x3c
EIP: _raw_spin_unlock_irq+0x2d/0x50
EFLAGS: 00000296 CPU: 2
EAX: 00000001 EBX: d2ccc51c ECX: 00000001 EDX: c1aacebd
ESI: 00000000 EDI: 00000000 EBP: c96c9d1c ESP: c96c9d18
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
? inherit_task_group.isra.98.part.99+0x6b/0xb0
__add_to_page_cache_locked+0x1d4/0x290
add_to_page_cache_lru+0x38/0xb0
pagecache_get_page+0x8e/0x200
f2fs_write_begin+0x96/0xf00 [f2fs]
? trace_hardirqs_on_caller+0xdd/0x1c0
? current_time+0x17/0x50
? trace_hardirqs_on+0xb/0x10
generic_perform_write+0xa9/0x170
__generic_file_write_iter+0x1a2/0x1f0
? f2fs_preallocate_blocks+0x137/0x160 [f2fs]
f2fs_file_write_iter+0x6e/0x140 [f2fs]
? __lock_acquire+0x429/0x7b0
__vfs_write+0xc1/0x140
vfs_write+0x9b/0x190
SyS_pwrite64+0x63/0xa0
do_fast_syscall_32+0xa1/0x1b0
entry_SYSENTER_32+0x4c/0x7b
EIP: 0xb7786c61
EFLAGS: 00000293 CPU: 2
EAX: ffffffda EBX: 00000003 ECX: 08416000 EDX: 00001000
ESI: 18b24000 EDI: 00000000 EBP: 00000003 ESP: bf9b36b0
DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
Fixes: aaec2b1d1879 ("f2fs: introduce cp_lock to protect updating of ckpt_flags")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx>
---
v2: spread spin_{,un}lock_irq{save,restore}.
fs/f2fs/checkpoint.c | 11 ++++++-----
fs/f2fs/f2fs.h | 18 ++++++++++++------
2 files changed, 18 insertions(+), 11 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 954917d582f8..56bbf592e487 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1053,8 +1053,9 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
{
unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+ unsigned long flags;
- spin_lock(&sbi->cp_lock);
+ spin_lock_irqsave(&sbi->cp_lock, flags);
if ((cpc->reason & CP_UMOUNT) &&
le32_to_cpu(ckpt->cp_pack_total_block_count) >
@@ -1085,14 +1086,14 @@ static void update_ckpt_flags(struct f2fs_sb_info *sbi, struct cp_control *cpc)
/* set this flag to activate crc|cp_ver for recovery */
__set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG);
- spin_unlock(&sbi->cp_lock);
+ spin_unlock_irqrestore(&sbi->cp_lock, flags);
}
static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
struct f2fs_nm_info *nm_i = NM_I(sbi);
- unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num;
+ unsigned long orphan_num = sbi->im[ORPHAN_INO].ino_num, flags;
block_t start_blk;
unsigned int data_sum_blocks, orphan_blocks;
__u32 crc32 = 0;
@@ -1134,12 +1135,12 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
/* 2 cp + n data seg summary + orphan inode blocks */
data_sum_blocks = npages_for_summary_flush(sbi, false);
- spin_lock(&sbi->cp_lock);
+ spin_lock_irqsave(&sbi->cp_lock, flags);
if (data_sum_blocks < NR_CURSEG_DATA_TYPE)
__set_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
else
__clear_ckpt_flags(ckpt, CP_COMPACT_SUM_FLAG);
- spin_unlock(&sbi->cp_lock);
+ spin_unlock_irqrestore(&sbi->cp_lock, flags);
orphan_blocks = GET_ORPHAN_BLOCKS(orphan_num);
ckpt->cp_pack_start_sum = cpu_to_le32(1 + cp_payload_blks +
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 0ca49e60002c..7ee533fc8e56 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1263,9 +1263,11 @@ static inline void __set_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
static inline void set_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
{
- spin_lock(&sbi->cp_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sbi->cp_lock, flags);
__set_ckpt_flags(F2FS_CKPT(sbi), f);
- spin_unlock(&sbi->cp_lock);
+ spin_unlock_irqrestore(&sbi->cp_lock, flags);
}
static inline void __clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f)
@@ -1279,22 +1281,26 @@ static inline void __clear_ckpt_flags(struct f2fs_checkpoint *cp, unsigned int f
static inline void clear_ckpt_flags(struct f2fs_sb_info *sbi, unsigned int f)
{
- spin_lock(&sbi->cp_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&sbi->cp_lock, flags);
__clear_ckpt_flags(F2FS_CKPT(sbi), f);
- spin_unlock(&sbi->cp_lock);
+ spin_unlock_irqrestore(&sbi->cp_lock, flags);
}
static inline void disable_nat_bits(struct f2fs_sb_info *sbi, bool lock)
{
+ unsigned long flags;
+
set_sbi_flag(sbi, SBI_NEED_FSCK);
if (lock)
- spin_lock(&sbi->cp_lock);
+ spin_lock_irqsave(&sbi->cp_lock, flags);
__clear_ckpt_flags(F2FS_CKPT(sbi), CP_NAT_BITS_FLAG);
kfree(NM_I(sbi)->nat_bits);
NM_I(sbi)->nat_bits = NULL;
if (lock)
- spin_unlock(&sbi->cp_lock);
+ spin_unlock_irqrestore(&sbi->cp_lock, flags);
}
static inline bool enabled_nat_bits(struct f2fs_sb_info *sbi,
--
2.13.0.90.g1eb437020