FYI, we noticed the below changes on
git://git.infradead.org/users/kbusch/linux-nvme master
commit 26efb85d35c71bc297e22773928062c97e41a8a2 ("blk-mq: dynamic h/w context count")
+------------------------------------------------+------------+------------+
| | e56dda0be8 | 26efb85d35 |
+------------------------------------------------+------------+------------+
| boot_successes | 6 | 2 |
| boot_failures | 1 | 28 |
| WARNING:at_kernel/trace/ftrace.c:#ftrace_bug() | 1 | |
| backtrace:perf_ftrace_event_register | 1 | |
| backtrace:perf_trace_init | 1 | |
| backtrace:perf_tp_event_init | 1 | |
| backtrace:perf_try_init_event | 1 | |
| backtrace:SYSC_perf_event_open | 1 | |
| backtrace:SyS_perf_event_open | 1 | |
| INFO:trying_to_register_non-static_key | 0 | 28 |
| backtrace:do_mount | 0 | 28 |
| backtrace:compat_SyS_mount | 0 | 5 |
| backtrace:SyS_mount | 0 | 23 |
+------------------------------------------------+------------+------------+
[ 22.943488] FAT-fs (nbd10): unable to read boot sector
[ 22.944820] block nbd10: Attempted send on closed socket
[ 22.947117] block nbd0: Attempted send on closed socket
[ 22.949310] INFO: trying to register non-static key.
[ 22.950428] the code is fine but needs lockdep annotation.
[ 22.951599] turning off the locking correctness validator.
[ 22.952839] CPU: 0 PID: 839 Comm: mount Not tainted 4.4.0-rc2-00145-g26efb85 #1
[ 22.954689] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 22.956860] 0000000000000000 ffff88001dc43928 ffffffff8173d271 0000000000000000
[ 22.958925] ffff88001dc43990 ffffffff81112bf7 ffff88001ef21a40 0000000000000000
[ 22.960946] 0000000000000002 0000000000000337 000000001ef211c0 ffff88001dc43a20
[ 22.963064] Call Trace:
[ 22.963926] [<ffffffff8173d271>] dump_stack+0x4b/0x63
[ 22.965115] [<ffffffff81112bf7>] register_lock_class+0x142/0x2e9
[ 22.966424] [<ffffffff81115116>] __lock_acquire+0x179/0xdee
[ 22.967700] [<ffffffff8171cabf>] ? blk_insert_flush+0x16e/0x1b1
[ 22.969038] [<ffffffff81092028>] ? kvm_clock_read+0x25/0x2e
[ 22.970322] [<ffffffff81116121>] lock_acquire+0x10a/0x196
[ 22.971538] [<ffffffff81116352>] ? lock_release+0x1a5/0x41a
[ 22.972787] [<ffffffff81116121>] ? lock_acquire+0x10a/0x196
[ 22.974085] [<ffffffff8171cabf>] ? blk_insert_flush+0x16e/0x1b1
[ 22.975427] [<ffffffff82e137df>] _raw_spin_lock_irq+0x3f/0x75
[ 22.976684] [<ffffffff8171cabf>] ? blk_insert_flush+0x16e/0x1b1
[ 22.978001] [<ffffffff8171cabf>] blk_insert_flush+0x16e/0x1b1
[ 22.979303] [<ffffffff81723fec>] blk_sq_make_request+0xf8/0x19f
[ 22.980610] [<ffffffff81719667>] generic_make_request+0xbd/0x160
[ 22.981909] [<ffffffff817197ff>] submit_bio+0xf5/0x100
[ 22.983063] [<ffffffff8110c29f>] ? __init_waitqueue_head+0x3b/0x4e
[ 22.984365] [<ffffffff817117f3>] submit_bio_wait+0x54/0x6a
[ 22.985581] [<ffffffff8171c3f4>] blkdev_issue_flush+0x62/0x84
[ 22.986866] [<ffffffff814d6d5b>] xfs_blkdev_issue_flush+0x19/0x1b
[ 22.988197] [<ffffffff814be9b0>] xfs_free_buftarg+0x3a/0x47
[ 22.989396] [<ffffffff814d559d>] xfs_close_devices+0x64/0x69
[ 22.990588] [<ffffffff814d665c>] xfs_fs_fill_super+0x323/0x504
[ 22.991795] [<ffffffff81201851>] mount_bdev+0x148/0x19f
[ 22.992905] [<ffffffff814d6339>] ? xfs_parseargs+0x8b6/0x8b6
[ 22.994062] [<ffffffff81112e61>] ? lockdep_init_map+0xc3/0x1c6
[ 22.995245] [<ffffffff814d4bf6>] xfs_fs_mount+0x15/0x17
[ 22.996324] [<ffffffff8120228c>] mount_fs+0x67/0x131
[ 22.997362] [<ffffffff8121921e>] vfs_kern_mount+0x6c/0xde
[ 22.998495] [<ffffffff8121bc35>] do_mount+0x88f/0x9ce
[ 22.999574] [<ffffffff811bf0f5>] ? strndup_user+0x3f/0x8c
[ 23.000706] [<ffffffff81241967>] compat_SyS_mount+0x185/0x1b1
[ 23.001892] [<ffffffff81003b19>] do_syscall_32_irqs_off+0x5c/0x6b
[ 23.003119] [<ffffffff82e169e8>] entry_INT80_compat+0x38/0x50
[ 23.004882] SQUASHFS error: squashfs_read_data failed to read block 0x0
[ 23.006257] squashfs: SQUASHFS error: unable to read squashfs_super_block
Thanks,
Ying Huang