FYI, we noticed the following commit:

commit: beeeccca9bebcec386cc31c250cff8a06cf27034 ("btrfs: Use kvzalloc instead of kzalloc/vmalloc in alloc_bitmap")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu kvm64,+ssse3 -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+-------------------------------------+------------+------------+
|                                     | 79495163d0 | beeeccca9b |
+-------------------------------------+------------+------------+
| boot_successes                      | 5          | 0          |
| boot_failures                       | 2          | 4          |
| invoked_oom-killer:gfp_mask=0x      | 1          |            |
| Mem-Info                            | 1          |            |
| BUG:scheduling_while_atomic         | 1          |            |
| WARNING:at_mm/util.c:#kvmalloc_node | 0          | 4          |
+-------------------------------------+------------+------------+



[   42.538761] WARNING: CPU: 1 PID: 1 at mm/util.c:357 kvmalloc_node+0x24/0x7f
[   42.566115] Modules linked in:
[   42.579911] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.12.0-rc2-00039-gbeeeccc #1
[   42.605667] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   42.635708] task: ffff88022a2c0000 task.stack: ffffc90000c54000
[   42.652751] RIP: 0010:kvmalloc_node+0x24/0x7f
[   42.667140] RSP: 0000:ffffc90000c57b90 EFLAGS: 00010283
[   42.683218] RAX: 0000000001400040 RBX: 0000000001408040 RCX: 0000000000001000
[   42.701823] RDX: 00000000ffffffff RSI: 0000000001408040 RDI: 0000000000000001
[   42.720999] RBP: ffffc90000c57ba8 R08: 0000000000000000 R09: 0000000000000011
[   42.740154] R10: ffff88020554d010 R11: 0000000000001000 R12: 0000000000000001
[   42.758754] R13: 00000000ffffffff R14: ffff88020a0f2000 R15: 0000000000000000
[   42.778133] FS:  0000000000000000(0000) GS:ffff88023fd00000(0000) knlGS:0000000000000000
[   42.804770] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   42.821362] CR2: ffffc90000ce0000 CR3: 0000000002011000 CR4: 00000000000006e0
[   42.840607] Call Trace:
[   42.851886]  convert_free_space_to_bitmaps+0x56/0x390
[   42.867254]  ? btrfs_get_token_32+0x7a/0xcc
[   42.881701]  check_free_space_extents+0xbf/0x100
[   42.896515]  test_empty_block_group+0x3a/0x46
[   42.911003]  run_test+0x23a/0x2e0
[   42.923478]  ? run_test+0x23a/0x2e0
[   42.936727]  ? test_remove_all+0x83/0x83
[   42.950403]  ? test_remove_all+0x83/0x83
[   42.964114]  ? test_remove_all+0x83/0x83
[   42.977599]  run_test_both_formats+0x2e/0x98
[   42.991788]  ? test_remove_all+0x83/0x83
[   43.005463]  btrfs_test_free_space_tree+0x55/0x8d
[   43.020567]  ? test_remove_all+0x83/0x83
[   43.034244]  ? test_remove_beginning+0x9e/0x9e
[   43.048722]  ? test_remove_end+0xaa/0xaa
[   43.062722]  ? test_remove_middle+0xb2/0xb2
[   43.076884]  ? test_merge_left+0xed/0xed
[   43.090200]  ? test_merge_right+0xf2/0xf2
[   43.267571]  ? test_merge_both+0x106/0x106
[   43.281697]  ? test_merge_none+0x128/0x128
[   43.295691]  ? check_free_space_extents+0x100/0x100
[   43.311023]  btrfs_run_sanity_tests+0xec/0x144
[   43.325511]  ? set_debug_rodata+0x17/0x17
[   43.339667]  init_btrfs_fs+0xd8/0x13d
[   43.353089]  ? trace_event_define_fields_qgroup_meta_reserve+0x8b/0x8b
[   43.371334]  do_one_initcall+0x90/0x137
[   43.385326]  ? set_debug_rodata+0x17/0x17
[   43.398999]  kernel_init_freeable+0x179/0x1fc
[   43.412840]  ? rest_init+0x87/0x87
[   43.424958]  kernel_init+0xe/0xfa
[   43.436923]  ret_from_fork+0x2c/0x40
[   43.449300] Code: e8 de ec 00 00 5d c3 0f 1f 44 00 00 89 f0 55 25 c0 00 40 01 3d c0 00 40 01 48 89 e5 41 55 41 54 41 89 d5 53 49 89 fc 89 f3 74 02 <0f> ff 49 81 fc 00 10 00 00 89 de 76 1d 0f ba e3 0a 73 0f 81 ce 
[   43.500146] ---[ end trace b527b0c96cf35883 ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong