diff options
| author | Qu Wenruo <wqu@suse.com> | 2019-04-25 08:55:53 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-04-29 19:02:52 +0200 |
| commit | 7c15d41016dc886cc011e3854d855e219759ae68 (patch) | |
| tree | ddc47fa3cc2187bebb66c39e61f0262d96475e93 /fs/btrfs/ctree.c | |
| parent | 02529d7a1077c5d00d990143cbd78aa56bb7c7cb (diff) | |
| download | linux-next-7c15d41016dc886cc011e3854d855e219759ae68.tar.gz | |
btrfs: ctree: Dump the leaf before BUG_ON in btrfs_set_item_key_safe
We have a long standing problem with reversed keys that's detected by
btrfs_set_item_key_safe. This is hard to reproduce so we'd like to
capture more information for later analysis.
Let's dump the leaf content before triggering BUG_ON() so that we can
have some clue on what's going wrong. The output of tree locks should
help us to debug such problem.
Sample stacktrace:
generic/522 [00:07:05]
[26946.113381] run fstests generic/522 at 2019-04-16 00:07:05
[27161.474720] kernel BUG at fs/btrfs/ctree.c:3192!
[27161.475923] invalid opcode: 0000 [#1] PREEMPT SMP
[27161.477167] CPU: 0 PID: 15676 Comm: fsx Tainted: G W 5.1.0-rc5-default+ #562
[27161.478932] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c89-prebuilt.qemu.org 04/01/2014
[27161.481099] RIP: 0010:btrfs_set_item_key_safe+0x146/0x1c0 [btrfs]
[27161.485369] RSP: 0018:ffffb087499e39b0 EFLAGS: 00010286
[27161.486464] RAX: 00000000ffffffff RBX: ffff941534d80e70 RCX: 0000000000024000
[27161.487929] RDX: 0000000000013039 RSI: ffffb087499e3aa5 RDI: ffffb087499e39c7
[27161.489289] RBP: 000000000000000e R08: ffff9414e0f49008 R09: 0000000000001000
[27161.490807] R10: 0000000000000000 R11: 0000000000000003 R12: ffff9414e0f48e70
[27161.492305] R13: ffffb087499e3aa5 R14: 0000000000000000 R15: 0000000000071000
[27161.493845] FS: 00007f8ea58d0b80(0000) GS:ffff94153d400000(0000) knlGS:0000000000000000
[27161.495608] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[27161.496717] CR2: 00007f8ea57a9000 CR3: 0000000016a33000 CR4: 00000000000006f0
[27161.498100] Call Trace:
[27161.498771] __btrfs_drop_extents+0x6ec/0xdf0 [btrfs]
[27161.499872] btrfs_log_changed_extents.isra.26+0x3a2/0x9e0 [btrfs]
[27161.501114] btrfs_log_inode+0x7ff/0xdc0 [btrfs]
[27161.502114] ? __mutex_unlock_slowpath+0x4b/0x2b0
[27161.503172] btrfs_log_inode_parent+0x237/0x9c0 [btrfs]
[27161.504348] btrfs_log_dentry_safe+0x4a/0x70 [btrfs]
[27161.505374] btrfs_sync_file+0x1b7/0x480 [btrfs]
[27161.506371] __x64_sys_msync+0x180/0x210
[27161.507208] do_syscall_64+0x54/0x180
[27161.507932] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[27161.508839] RIP: 0033:0x7f8ea5aa9c61
[27161.512616] RSP: 002b:00007ffea2a06498 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
[27161.514161] RAX: ffffffffffffffda RBX: 000000000002a938 RCX: 00007f8ea5aa9c61
[27161.515376] RDX: 0000000000000004 RSI: 000000000001c9b2 RDI: 00007f8ea578d000
[27161.516572] RBP: 000000000001c07a R08: fffffffffffffff8 R09: 000000000002a000
[27161.517883] R10: 00007f8ea57a99b2 R11: 0000000000000246 R12: 0000000000000938
[27161.519080] R13: 00007f8ea578d000 R14: 000000000001c9b2 R15: 0000000000000000
[27161.520281] Modules linked in: btrfs libcrc32c xor zstd_decompress zstd_compress xxhash raid6_pq loop [last unloaded: scsi_debug]
[27161.522272] ---[ end trace d5afec7ccac6a252 ]---
[27161.523111] RIP: 0010:btrfs_set_item_key_safe+0x146/0x1c0 [btrfs]
[27161.527253] RSP: 0018:ffffb087499e39b0 EFLAGS: 00010286
[27161.528192] RAX: 00000000ffffffff RBX: ffff941534d80e70 RCX: 0000000000024000
[27161.529392] RDX: 0000000000013039 RSI: ffffb087499e3aa5 RDI: ffffb087499e39c7
[27161.530607] RBP: 000000000000000e R08: ffff9414e0f49008 R09: 0000000000001000
[27161.531802] R10: 0000000000000000 R11: 0000000000000003 R12: ffff9414e0f48e70
[27161.533018] R13: ffffb087499e3aa5 R14: 0000000000000000 R15: 0000000000071000
[27161.534405] FS: 00007f8ea58d0b80(0000) GS:ffff94153d400000(0000) knlGS:0000000000000000
[27161.536048] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[27161.537210] CR2: 00007f8ea57a9000 CR3: 0000000016a33000 CR4: 00000000000006f0
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 5116c2a1f0f9..5df76c17775a 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -3185,11 +3185,31 @@ void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info, slot = path->slots[0]; if (slot > 0) { btrfs_item_key(eb, &disk_key, slot - 1); - BUG_ON(comp_keys(&disk_key, new_key) >= 0); + if (unlikely(comp_keys(&disk_key, new_key) >= 0)) { + btrfs_crit(fs_info, + "slot %u key (%llu %u %llu) new key (%llu %u %llu)", + slot, btrfs_disk_key_objectid(&disk_key), + btrfs_disk_key_type(&disk_key), + btrfs_disk_key_offset(&disk_key), + new_key->objectid, new_key->type, + new_key->offset); + btrfs_print_leaf(eb); + BUG(); + } } if (slot < btrfs_header_nritems(eb) - 1) { btrfs_item_key(eb, &disk_key, slot + 1); - BUG_ON(comp_keys(&disk_key, new_key) <= 0); + if (unlikely(comp_keys(&disk_key, new_key) <= 0)) { + btrfs_crit(fs_info, + "slot %u key (%llu %u %llu) new key (%llu %u %llu)", + slot, btrfs_disk_key_objectid(&disk_key), + btrfs_disk_key_type(&disk_key), + btrfs_disk_key_offset(&disk_key), + new_key->objectid, new_key->type, + new_key->offset); + btrfs_print_leaf(eb); + BUG(); + } } btrfs_cpu_key_to_disk(&disk_key, new_key); |