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Message-ID: <20130308125545.GA18986@gmail.com> Date: Fri, 8 Mar 2013 20:55:45 +0800 From: Zheng Liu <gnehzuil.liu@...il.com> To: Jan Kara <jack@...e.cz> Cc: linux-ext4@...r.kernel.org Subject: Re: [BUG][data=journal] general protection fault is hitted when we run xfstests #074 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 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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