Re: [BUG][data=journal] general protection fault is hitted when we run xfstests #074

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On Thu, Mar 07, 2013 at 01:26:38PM +0100, Jan Kara wrote:
> On Thu 07-03-13 20:20:19, Zheng Liu wrote:
> > Hi all,
> > 
> > This bug can be hitted in 3.8 kernel, and it doesn't be fixed in dev
> > branch.  When #074 runs in a ext4 file system with '-o data=journal', I
> > will get a general protection fault in my sand box.  I need to run
> > several times to hit this bug.
> > 
> > My sand box is a Dell Desktop with a Intel(R) Core(TM)2 Duo CPU E8400
> > @ 3.00GHz, 4G memory, a 160G HDD and a Intel SSD.  The test runs against
> > SSD.
> > 
> > The messages from dmesg:
> > 
> > wenqing: run xfstest 074
> > kernel: EXT4-fs (sda1): mounted filesystem with journalled data mode.
> > Opts: acl,user_xattr,data=journal
> > kernel: EXT4-fs (sda1): mounted filesystem with journalled data mode.
> > Opts: acl,user_xattr,data=journal
> > kernel: EXT4-fs (sda1): mounted filesystem with journalled data mode.
> > Opts: acl,user_xattr,data=journal
> > kernel: EXT4-fs (sda1): mounted filesystem with journalled data mode.
> > Opts: acl,user_xattr,data=journal
> > kernel: general protection fault: 0000 [#1] SMP 
> > kernel: Modules linked in: ext4 jbd2 crc16 cpufreq_ondemand ipv6
> > dm_mirror dm_region_hash dm_log dm_mod parport_pc parport dcdbas
> > acpi_cpufreq mperf sg button pcspkr serio_raw i2c_i801 i2c_core ehci_pci
> > ehci_hcd e1000e ext3 jbd sd_mod ahci libahci libata scsi_mod uhci_hcd
> > kernel: CPU 1 
> > kernel: Pid: 2786, comm: flush-8:0 Not tainted 3.8.0 #1 Dell Inc.
> > OptiPlex 780                 /0V4W66
> > kernel: RIP: 0010:[<ffffffffa01da0a0>]  [<ffffffffa01da0a0>]
> > jbd2_journal_dirty_metadata+0x147/0x211 [jbd2]
> > kernel: RSP: 0000:ffff880107a93868  EFLAGS: 00010206
> > kernel: RAX: 0000000000000000 RBX: ffff88010a674540 RCX: 5c5c5c5c5c5c5c5c
> > kernel: RDX: 000000000034402d RSI: ffff88010a674540 RDI: ffff880105bd6ca0
> > kernel: RBP: ffff880107a938b8 R08: 0000000000000000 R09: 0000000000000000
> > kernel: R10: ffff880105bd6ca0 R11: 000000000000000c R12: ffff88008e4ee518
> > kernel: R13: ffff8801114fb800 R14: ffff880105bd6ca0 R15: ffff88010a658c80
> > kernel: FS:  0000000000000000(0000) GS:ffff880117c40000(0000)
> > knlGS:0000000000000000
> > kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > kernel: CR2: 00007f60256a5000 CR3: 0000000117834000 CR4: 00000000000407e0
> > kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > kernel: Process flush-8:0 (pid: 2786, threadinfo ffff880107a92000, task
> > ffff880112cde6b0)
> > kernel: Stack:
> > kernel: ffff880105bd6ca0 0000000000001000 ffff880107a938a8 ffffffffa01da6de
> > kernel: ffff8801114fb868 0000000000000000 00000000000003bf ffffffffa023f0e0
> > kernel: ffff88010a674540 0000000000001000 ffff880107a938f8 ffffffffa022bb07
> > kernel: Call Trace:
> > kernel: [<ffffffffa01da6de>] ? jbd2_journal_get_write_access+0x36/0x40 [jbd2]
> > kernel: [<ffffffffa022bb07>] __ext4_handle_dirty_metadata+0xd7/0xe6 [ext4]
> > kernel: [<ffffffffa01ff4a5>] write_end_fn+0x37/0x3d [ext4]
> > kernel: [<ffffffffa01ff167>] ext4_walk_page_buffers+0x65/0x9b [ext4]
> > kernel: [<ffffffffa01ff46e>] ? ext4_nonda_switch+0xbd/0xbd [ext4]
> > kernel: [<ffffffffa0203367>] __ext4_journalled_writepage+0x156/0x1ee [ext4]
> > kernel: [<ffffffffa0203c10>] ext4_writepage+0x1b8/0x20d [ext4]
> > kernel: [<ffffffff820b7ab4>] __writepage+0x17/0x30
> > kernel: [<ffffffff820b8554>] write_cache_pages+0x276/0x37f
> > kernel: [<ffffffff820b7a9d>] ? set_page_dirty+0x64/0x64
> > kernel: [<ffffffff820b86a2>] generic_writepages+0x45/0x5c
> > kernel: [<ffffffff820b86e0>] do_writepages+0x27/0x29
> > kernel: [<ffffffff8210fc93>] __writeback_single_inode+0x48/0x119
> > kernel: [<ffffffff82110e7c>] writeback_sb_inodes+0x1ec/0x2fd
> > kernel: [<ffffffff82110fff>] __writeback_inodes_wb+0x72/0xb0
> > kernel: [<ffffffff821111ee>] wb_writeback+0x13e/0x230
> > kernel: [<ffffffff820b8dae>] ? global_dirty_limits+0x36/0x134
> > kernel: [<ffffffff821114aa>] wb_do_writeback+0x1ca/0x1ea
> > kernel: [<ffffffff8211158c>] bdi_writeback_thread+0xc2/0x1e2
> > kernel: [<ffffffff821114ca>] ? wb_do_writeback+0x1ea/0x1ea
> > kernel: [<ffffffff821114ca>] ? wb_do_writeback+0x1ea/0x1ea
> > kernel: [<ffffffff8204eadf>] kthread+0xb5/0xbd
> > kernel: [<ffffffff8204ea2a>] ? kthread_freezable_should_stop+0x65/0x65
> > kernel: [<ffffffff8238689c>] ret_from_fork+0x7c/0xb0
> > kernel: [<ffffffff8204ea2a>] ? kthread_freezable_should_stop+0x65/0x65
> > kernel: Code: 08 49 8b 4c 24 28 4c 39 f9 0f 84 81 00 00 00 4d 8b 4d 58 31 c0
> > 4c 39 c9 74 36 4d 85 c9 74 04 41 8b 41 08 45 31 c0 48 85 c9 74 04 <44> 8b 41
> > 08 48 8b 53 18 49 8d b5 58 03 00 00 89 04 24 48 c7 c7 
> > kernel: RIP  [<ffffffffa01da0a0>] jbd2_journal_dirty_metadata+0x147/0x211 [jbd2]
> > kernel: RSP <ffff880107a93868>
> > kernel: ---[ end trace d8e02cf12f9b2b79 ]---
>   Hum, clearly we hit some poison value (RCX which was dereferenced was
> 0x5c5c5c5c5c5c5c5c). Can you post full disassembly of
> jbd2_journal_dirty_metadata()? I was trying to match decoded 'Code' section
> with the C code but I failed...

Sorry for the delay.  Here is the result that I use 'objdump -r -S -l
--disassemble fs/jbd2/jbd2.ko' to generate.  Hope it's useful for you.

Sorry I don't have time to look at it carefully.  Please let me know if
you need some details.

Thanks,
                                                - Zheng

0000000000000f59 <jbd2_journal_dirty_metadata>:
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1101
 * data present for that commit).  In that case, we don't relink the
 * buffer: that only gets done when the old transaction finally
 * completes its commit.
 */
int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
{
     f59:	55                   	push   %rbp
     f5a:	48 89 e5             	mov    %rsp,%rbp
     f5d:	41 57                	push   %r15
     f5f:	41 56                	push   %r14
     f61:	41 55                	push   %r13
     f63:	41 54                	push   %r12
     f65:	53                   	push   %rbx
     f66:	48 83 ec 28          	sub    $0x28,%rsp
     f6a:	e8 00 00 00 00       	callq  f6f <jbd2_journal_dirty_metadata+0x16>
			f6b: R_X86_64_PC32	mcount-0x4
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1107
	transaction_t *transaction = handle->h_transaction;
	journal_t *journal = transaction->t_journal;
	struct journal_head *jh = bh2jh(bh);
	int ret = 0;

	jbd_debug(5, "journal_head %p\n", jh);
     f6f:	80 3d 00 00 00 00 04 	cmpb   $0x4,0x0(%rip)        # f76 <jbd2_journal_dirty_metadata+0x1d>
			f71: R_X86_64_PC32	jbd2_journal_enable_debug-0x5
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1102
 * buffer: that only gets done when the old transaction finally
 * completes its commit.
 */
int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
{
	transaction_t *transaction = handle->h_transaction;
     f76:	4c 8b 3f             	mov    (%rdi),%r15
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1101
 * data present for that commit).  In that case, we don't relink the
 * buffer: that only gets done when the old transaction finally
 * completes its commit.
 */
int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
{
     f79:	49 89 fe             	mov    %rdi,%r14
     f7c:	48 89 f3             	mov    %rsi,%rbx
bh2jh():
/home/wenqing/projects/linux/include/linux/jbd_common.h:37
     f7f:	4c 8b 66 40          	mov    0x40(%rsi),%r12
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1103
	transaction_t *transaction = handle->h_transaction;
	journal_t *journal = transaction->t_journal;
     f83:	4d 8b 2f             	mov    (%r15),%r13
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1107
	struct journal_head *jh = bh2jh(bh);
	int ret = 0;

	jbd_debug(5, "journal_head %p\n", jh);
     f86:	76 32                	jbe    fba <jbd2_journal_dirty_metadata+0x61>
     f88:	48 c7 c6 00 00 00 00 	mov    $0x0,%rsi
			f8b: R_X86_64_32S	.rodata.str1.1
     f8f:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi
			f92: R_X86_64_32S	.rodata.str1.1+0x16
     f96:	48 c7 c1 00 00 00 00 	mov    $0x0,%rcx
			f99: R_X86_64_32S	.rodata+0xc0
     f9d:	ba 53 04 00 00       	mov    $0x453,%edx
     fa2:	31 c0                	xor    %eax,%eax
     fa4:	e8 00 00 00 00       	callq  fa9 <jbd2_journal_dirty_metadata+0x50>
			fa5: R_X86_64_PC32	printk-0x4
     fa9:	4c 89 e6             	mov    %r12,%rsi
     fac:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi
			faf: R_X86_64_32S	.rodata.str1.1+0x178
     fb3:	31 c0                	xor    %eax,%eax
     fb5:	e8 00 00 00 00       	callq  fba <jbd2_journal_dirty_metadata+0x61>
			fb6: R_X86_64_PC32	printk-0x4
is_handle_aborted():
/home/wenqing/projects/linux/include/linux/jbd2.h:1246
	return journal->j_flags & JBD2_ABORT;
}

static inline int is_handle_aborted(handle_t *handle)
{
	if (handle->h_aborted)
     fba:	41 f6 46 14 04       	testb  $0x4,0x14(%r14)
     fbf:	0f 85 94 01 00 00    	jne    1159 <jbd2_journal_dirty_metadata+0x200>
/home/wenqing/projects/linux/include/linux/jbd2.h:1248
		return 1;
	return is_journal_aborted(handle->h_transaction->t_journal);
     fc5:	49 8b 06             	mov    (%r14),%rax
is_journal_aborted():
/home/wenqing/projects/linux/include/linux/jbd2.h:1241
 * transactions.
 */

static inline int is_journal_aborted(journal_t *journal)
{
	return journal->j_flags & JBD2_ABORT;
     fc8:	48 8b 00             	mov    (%rax),%rax
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1109
	JBUFFER_TRACE(jh, "entry");
	if (is_handle_aborted(handle))
     fcb:	f6 00 02             	testb  $0x2,(%rax)
     fce:	0f 85 85 01 00 00    	jne    1159 <jbd2_journal_dirty_metadata+0x200>
constant_test_bit():
/home/wenqing/projects/linux/arch/x86/include/asm/bitops.h:321
}

static __always_inline int constant_test_bit(unsigned int nr, const volatile unsigned long *addr)
{
	return ((1UL << (nr % BITS_PER_LONG)) &
		(addr[nr / BITS_PER_LONG])) != 0;
     fd4:	48 8b 13             	mov    (%rbx),%rdx
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1111
		goto out;
	if (!buffer_jbd(bh)) {
     fd7:	b8 8b ff ff ff       	mov    $0xffffff8b,%eax
     fdc:	80 e6 40             	and    $0x40,%dh
     fdf:	0f 84 5b 01 00 00    	je     1140 <jbd2_journal_dirty_metadata+0x1e7>
     fe5:	eb 0c                	jmp    ff3 <jbd2_journal_dirty_metadata+0x9a>
rep_nop():
/home/wenqing/projects/linux/arch/x86/include/asm/processor.h:660
     fe7:	f3 90                	pause  
constant_test_bit():
/home/wenqing/projects/linux/arch/x86/include/asm/bitops.h:321
     fe9:	48 8b 03             	mov    (%rbx),%rax
bit_spin_lock():
/home/wenqing/projects/linux/include/linux/bit_spinlock.h:30
		preempt_enable();
		do {
			cpu_relax();
		} while (test_bit(bitnum, addr));
     fec:	a9 00 00 10 00       	test   $0x100000,%eax
     ff1:	75 f4                	jne    fe7 <jbd2_journal_dirty_metadata+0x8e>
test_and_set_bit():
/home/wenqing/projects/linux/arch/x86/include/asm/bitops.h:201
 */
static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
{
	int oldbit;

	asm volatile(LOCK_PREFIX "bts %2,%1\n\t"
     ff3:	f0 0f ba 2b 14       	lock btsl $0x14,(%rbx)
     ff8:	19 c0                	sbb    %eax,%eax
bit_spin_lock():
/home/wenqing/projects/linux/include/linux/bit_spinlock.h:26
	 * busywait with less bus contention for a good time to
	 * attempt to acquire the lock bit.
	 */
	preempt_disable();
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
	while (unlikely(test_and_set_bit_lock(bitnum, addr))) {
     ffa:	85 c0                	test   %eax,%eax
     ffc:	75 e9                	jne    fe7 <jbd2_journal_dirty_metadata+0x8e>
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1118
		goto out;
	}

	jbd_lock_bh_state(bh);

	if (jh->b_modified == 0) {
     ffe:	41 83 7c 24 10 00    	cmpl   $0x0,0x10(%r12)
    1004:	75 1b                	jne    1021 <jbd2_journal_dirty_metadata+0xc8>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1124
		/*
		 * This buffer's got modified and becoming part
		 * of the transaction. This needs to be done
		 * once a transaction -bzzz
		 */
		jh->b_modified = 1;
    1006:	41 c7 44 24 10 01 00 	movl   $0x1,0x10(%r12)
    100d:	00 00 
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1125
		J_ASSERT_JH(jh, handle->h_buffer_credits > 0);
    100f:	41 8b 46 08          	mov    0x8(%r14),%eax
    1013:	85 c0                	test   %eax,%eax
    1015:	7f 04                	jg     101b <jbd2_journal_dirty_metadata+0xc2>
    1017:	0f 0b                	ud2a   
    1019:	eb fe                	jmp    1019 <jbd2_journal_dirty_metadata+0xc0>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1126
		handle->h_buffer_credits--;
    101b:	ff c8                	dec    %eax
    101d:	41 89 46 08          	mov    %eax,0x8(%r14)
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1136
	 * on the running transaction's metadata list there is nothing to do.
	 * Nobody can take it off again because there is a handle open.
	 * I _think_ we're OK here with SMP barriers - a mistaken decision will
	 * result in this test being false, so we go in and take the locks.
	 */
	if (jh->b_transaction == transaction && jh->b_jlist == BJ_Metadata) {
    1021:	49 8b 4c 24 28       	mov    0x28(%r12),%rcx
    1026:	4c 39 f9             	cmp    %r15,%rcx
    1029:	75 46                	jne    1071 <jbd2_journal_dirty_metadata+0x118>
    102b:	41 83 7c 24 0c 01    	cmpl   $0x1,0xc(%r12)
    1031:	75 3e                	jne    1071 <jbd2_journal_dirty_metadata+0x118>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1138
		JBUFFER_TRACE(jh, "fastpath");
		if (unlikely(jh->b_transaction !=
    1033:	4d 8b 4d 50          	mov    0x50(%r13),%r9
    1037:	31 c0                	xor    %eax,%eax
    1039:	4d 39 cf             	cmp    %r9,%r15
    103c:	0f 84 f5 00 00 00    	je     1137 <jbd2_journal_dirty_metadata+0x1de>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1140
			     journal->j_running_transaction)) {
			printk(KERN_EMERG "JBD: %s: "
    1042:	4d 85 c9             	test   %r9,%r9
    1045:	74 04                	je     104b <jbd2_journal_dirty_metadata+0xf2>
    1047:	41 8b 41 08          	mov    0x8(%r9),%eax
    104b:	45 31 c0             	xor    %r8d,%r8d
    104e:	48 85 c9             	test   %rcx,%rcx
    1051:	74 04                	je     1057 <jbd2_journal_dirty_metadata+0xfe>
    1053:	44 8b 41 08          	mov    0x8(%rcx),%r8d
    1057:	48 8b 53 18          	mov    0x18(%rbx),%rdx
    105b:	49 8d b5 58 03 00 00 	lea    0x358(%r13),%rsi
    1062:	89 04 24             	mov    %eax,(%rsp)
    1065:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi
			1068: R_X86_64_32S	.rodata.str1.1+0x189
    106c:	e9 86 00 00 00       	jmpq   10f7 <jbd2_journal_dirty_metadata+0x19e>
set_bit():
/home/wenqing/projects/linux/arch/x86/include/asm/bitops.h:65
 */
static __always_inline void
set_bit(unsigned int nr, volatile unsigned long *addr)
{
	if (IS_IMMEDIATE(nr)) {
		asm volatile(LOCK_PREFIX "orb %1,%0"
    1071:	f0 80 4b 02 08       	lock orb $0x8,0x2(%rbx)
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1163
	 * Metadata already on the current transaction list doesn't
	 * need to be filed.  Metadata on another transaction's list must
	 * be committing, and will be refiled once the commit completes:
	 * leave it alone for now.
	 */
	if (jh->b_transaction != transaction) {
    1076:	49 8b 4c 24 28       	mov    0x28(%r12),%rcx
    107b:	4c 39 f9             	cmp    %r15,%rcx
    107e:	0f 84 81 00 00 00    	je     1105 <jbd2_journal_dirty_metadata+0x1ac>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1165
		JBUFFER_TRACE(jh, "already on other transaction");
		if (unlikely(jh->b_transaction !=
    1084:	4d 8b 4d 58          	mov    0x58(%r13),%r9
    1088:	31 c0                	xor    %eax,%eax
    108a:	4c 39 c9             	cmp    %r9,%rcx
    108d:	74 36                	je     10c5 <jbd2_journal_dirty_metadata+0x16c>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1167
			     journal->j_committing_transaction)) {
			printk(KERN_EMERG "JBD: %s: "
    108f:	4d 85 c9             	test   %r9,%r9
    1092:	74 04                	je     1098 <jbd2_journal_dirty_metadata+0x13f>
    1094:	41 8b 41 08          	mov    0x8(%r9),%eax
    1098:	45 31 c0             	xor    %r8d,%r8d
    109b:	48 85 c9             	test   %rcx,%rcx
    109e:	74 04                	je     10a4 <jbd2_journal_dirty_metadata+0x14b>
    10a0:	44 8b 41 08          	mov    0x8(%rcx),%r8d
    10a4:	48 8b 53 18          	mov    0x18(%rbx),%rdx
    10a8:	49 8d b5 58 03 00 00 	lea    0x358(%r13),%rsi
    10af:	89 04 24             	mov    %eax,(%rsp)
    10b2:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi
			10b5: R_X86_64_32S	.rodata.str1.1+0x1e0
    10b9:	31 c0                	xor    %eax,%eax
    10bb:	e8 00 00 00 00       	callq  10c0 <jbd2_journal_dirty_metadata+0x167>
			10bc: R_X86_64_PC32	printk-0x4
    10c0:	b8 ea ff ff ff       	mov    $0xffffffea,%eax
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1179
			       journal->j_committing_transaction,
			       journal->j_committing_transaction ?
			       journal->j_committing_transaction->t_tid : 0);
			ret = -EINVAL;
		}
		if (unlikely(jh->b_next_transaction != transaction)) {
    10c5:	49 8b 4c 24 30       	mov    0x30(%r12),%rcx
    10ca:	4c 39 f9             	cmp    %r15,%rcx
    10cd:	74 68                	je     1137 <jbd2_journal_dirty_metadata+0x1de>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1180
			printk(KERN_EMERG "JBD: %s: "
    10cf:	45 31 c0             	xor    %r8d,%r8d
    10d2:	48 85 c9             	test   %rcx,%rcx
    10d5:	41 8b 47 08          	mov    0x8(%r15),%eax
    10d9:	74 04                	je     10df <jbd2_journal_dirty_metadata+0x186>
    10db:	44 8b 41 08          	mov    0x8(%rcx),%r8d
    10df:	48 8b 53 18          	mov    0x18(%rbx),%rdx
    10e3:	49 8d b5 58 03 00 00 	lea    0x358(%r13),%rsi
    10ea:	89 04 24             	mov    %eax,(%rsp)
    10ed:	4d 89 f9             	mov    %r15,%r9
    10f0:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi
			10f3: R_X86_64_32S	.rodata.str1.1+0x23a
    10f7:	31 c0                	xor    %eax,%eax
    10f9:	e8 00 00 00 00       	callq  10fe <jbd2_journal_dirty_metadata+0x1a5>
			10fa: R_X86_64_PC32	printk-0x4
    10fe:	b8 ea ff ff ff       	mov    $0xffffffea,%eax
    1103:	eb 32                	jmp    1137 <jbd2_journal_dirty_metadata+0x1de>
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1197
		 * transaction's data buffer, ever. */
		goto out_unlock_bh;
	}

	/* That test should have eliminated the following case: */
	J_ASSERT_JH(jh, jh->b_frozen_data == NULL);
    1105:	49 83 7c 24 18 00    	cmpq   $0x0,0x18(%r12)
    110b:	74 04                	je     1111 <jbd2_journal_dirty_metadata+0x1b8>
    110d:	0f 0b                	ud2a   
    110f:	eb fe                	jmp    110f <jbd2_journal_dirty_metadata+0x1b6>
spin_lock():
/home/wenqing/projects/linux/include/linux/spinlock.h:285
    1111:	49 8d bd 9c 03 00 00 	lea    0x39c(%r13),%rdi
    1118:	e8 00 00 00 00       	callq  111d <jbd2_journal_dirty_metadata+0x1c4>
			1119: R_X86_64_PC32	_raw_spin_lock-0x4
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1201

	JBUFFER_TRACE(jh, "file as BJ_Metadata");
	spin_lock(&journal->j_list_lock);
	__jbd2_journal_file_buffer(jh, handle->h_transaction, BJ_Metadata);
    111d:	49 8b 36             	mov    (%r14),%rsi
    1120:	ba 01 00 00 00       	mov    $0x1,%edx
    1125:	4c 89 e7             	mov    %r12,%rdi
    1128:	e8 00 00 00 00       	callq  112d <jbd2_journal_dirty_metadata+0x1d4>
			1129: R_X86_64_PC32	__jbd2_journal_file_buffer-0x4
__ticket_spin_unlock():
/home/wenqing/projects/linux/arch/x86/include/asm/spinlock.h:81
    112d:	41 80 85 9c 03 00 00 	addb   $0x1,0x39c(%r13)
    1134:	01 
    1135:	31 c0                	xor    %eax,%eax
clear_bit():
/home/wenqing/projects/linux/arch/x86/include/asm/bitops.h:103
 */
static __always_inline void
clear_bit(int nr, volatile unsigned long *addr)
{
	if (IS_IMMEDIATE(nr)) {
		asm volatile(LOCK_PREFIX "andb %1,%0"
    1137:	f0 80 63 02 ef       	lock andb $0xef,0x2(%rbx)
jbd2_journal_dirty_metadata():
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1207
	spin_unlock(&journal->j_list_lock);
out_unlock_bh:
	jbd_unlock_bh_state(bh);
out:
	JBUFFER_TRACE(jh, "exit");
	WARN_ON(ret);	/* All errors are bugs, so dump the stack */
    113c:	85 c0                	test   %eax,%eax
    113e:	74 1b                	je     115b <jbd2_journal_dirty_metadata+0x202>
    1140:	be b7 04 00 00       	mov    $0x4b7,%esi
    1145:	48 c7 c7 00 00 00 00 	mov    $0x0,%rdi
			1148: R_X86_64_32S	.rodata.str1.1
    114c:	89 45 c8             	mov    %eax,-0x38(%rbp)
    114f:	e8 00 00 00 00       	callq  1154 <jbd2_journal_dirty_metadata+0x1fb>
			1150: R_X86_64_PC32	warn_slowpath_null-0x4
    1154:	8b 45 c8             	mov    -0x38(%rbp),%eax
    1157:	eb 02                	jmp    115b <jbd2_journal_dirty_metadata+0x202>
    1159:	31 c0                	xor    %eax,%eax
/home/wenqing/projects/linux/fs/jbd2/transaction.c:1209
	return ret;
}
    115b:	48 83 c4 28          	add    $0x28,%rsp
    115f:	5b                   	pop    %rbx
    1160:	41 5c                	pop    %r12
    1162:	41 5d                	pop    %r13
    1164:	41 5e                	pop    %r14
    1166:	41 5f                	pop    %r15
    1168:	c9                   	leaveq 
    1169:	c3                   	retq   
--
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