On Sun, Feb 26, 2017 at 07:18:42PM -0500, Dave Jones wrote:

Hitting this fairly frequently.. I'm not sure if this is the same bug I've
been hitting occasionally since 4.9. The assertion looks new to me at least.

It was recently introduced by my commit and used to catch data loss at truncate.

Were you running the test with a mkfs.btrfs -O NO_HOLES?
(We just queued a fix for the NO_HOLES case in btrfs-next.)

Thanks,

-liubo

	Dave

assertion failed: last_size == new_size, file: fs/btrfs/inode.c, line: 4619
------------[ cut here ]------------
kernel BUG at fs/btrfs/ctree.h:3422!
invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU: 3 PID: 15655 Comm: trinity-c25 Not tainted 4.10.0-think+ #9 
task: ffff8804fb128040 task.stack: ffffc90008534000
RIP: 0010:assfail.constprop.74+0x1c/0x1e [btrfs]
RSP: 0018:ffffc90008537c58 EFLAGS: 00010282
RAX: 000000000000004b RBX: 0000000000001000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff81cb4173 RDI: 00000000ffffffff
RBP: ffffc90008537c58 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8804fe821348
R13: ffff88047eb5bb88 R14: ffff8804fe821348 R15: 0000000000000005
FS:  00007f99b77a6b40(0000) GS:ffff880507e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f99b77a9010 CR3: 000000048c4bf000 CR4: 00000000001406e0
Call Trace:
 btrfs_truncate_inode_items+0xbee/0x11e0 [btrfs]
 ? debug_smp_processor_id+0x17/0x20
 btrfs_truncate+0x102/0x2a0 [btrfs]
 btrfs_setattr+0x246/0x3b0 [btrfs]
 notify_change+0x256/0x440
 do_truncate+0x73/0xc0
 do_sys_ftruncate.constprop.19+0x111/0x170
 ? __this_cpu_preempt_check+0x13/0x20
 SyS_ftruncate+0xe/0x10
 do_syscall_64+0x66/0x1d0
 entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7f99b70d00f9
RSP: 002b:00007ffd992b7768 EFLAGS: 00000246
 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 000000000000004d RCX: 00007f99b70d00f9
RDX: 0003680201d80849 RSI: 0000000000000d95 RDI: 0000000000000187
RBP: 00007f99b76f0000 R08: 0000000000000001 R09: 0000000000000fd7
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f99b76f0048 R14: 00007f99b77a6ad8 R15: 00007f99b76f0000
Code: 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 55 89 f1 48 c7 c2 b1 f7 11 a0 48 89 fe 48 89 e5 48 c7 c7 f0 52 12 a0 e8 03 b7 0b e1 <0f> 0b 55 89 f1 48 c7 c2 a8 fa 11 a0 48 89 fe 48 89 e5 48 c7 c7 
RIP: assfail.constprop.74+0x1c/0x1e [btrfs] RSP: ffffc90008537c58
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