After the warning described in
"mark_buffer_dirty WARN_ON_ONCE on buffer_uptodate"
shutting down the system triggered a different WARN_ON_ONCE,
reporting that write_inode_now failed.
[22138.654946] EXT4-fs (sdu): previous I/O error to superblock detected
[22138.657435] Buffer I/O error on dev sdu, logical block 0, lost sync page write
[22138.660216] EXT4-fs error (device sdu): ext4_put_super:792: Couldn't clean up the journal
[22138.686148] ------------[ cut here ]------------
[22138.688406] WARNING: CPU: 0 PID: 15793 at fs/block_dev.c:67 bdev_inode_switch_bdi+0x81/0x90()
[22138.691568] Modules linked in: ftdi_sio usbserial nfsd nfs_acl exportfs autofs4 rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs fscache lockd sunrpc cpufreq_ondemand pcc_cpufreq dm_mirror dm_region_hash dm_log uinput ipv6 iTCO_wdt iTCO_vendor_support microcode serio_raw pcspkr sb_edac edac_core hpilo hpwdt lpc_ich mfd_core ioatdma dca dm_mod wmi sg tg3 ptp pps_core ext4(E) jbd2(E) mbcache(E) sd_mod(E) crc_t10dif(E) crct10dif_common(E) pata_acpi(E) ata_generic(E) ata_piix(E) hpsa(E) mpt3sas(E) scsi_transport_sas(E) raid_class(E)
[22138.715231] CPU: 0 PID: 15793 Comm: umount Tainted: G W EL 3.17.0-rc4+ #3
[22138.718904] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 09/08/2013
[22138.721423] 0000000000000043 ffff8803ea14fda8 ffffffff815a8b3f 0000000000000043
[22138.725253] 0000000000000000 ffff8803ea14fde8 ffffffff8105267c ffffffff8181ca12
[22138.728817] ffff88042e0f75b8 ffff88042e0f7530 ffffffff81a8d9a0 ffff88042c80d000
[22138.732579] Call Trace:
[22138.733623] [<ffffffff815a8b3f>] dump_stack+0x49/0x62
[22138.735595] [<ffffffff8105267c>] warn_slowpath_common+0x8c/0xc0
[22138.737952] [<ffffffff810526ca>] warn_slowpath_null+0x1a/0x20
[22138.740080] [<ffffffff811cfcd1>] bdev_inode_switch_bdi+0x81/0x90
[22138.742708] [<ffffffff811d0fbf>] __blkdev_put+0x7f/0x1c0
[22138.744745] [<ffffffff815aa519>] ? mutex_unlock+0x9/0x20
[22138.747487] [<ffffffff811d1156>] blkdev_put+0x56/0x140
[22138.749512] [<ffffffff8119d4fd>] kill_block_super+0x4d/0x80
[22138.751942] [<ffffffff8119d804>] deactivate_locked_super+0x54/0x70
[22138.754315] [<ffffffff8119e05a>] deactivate_super+0x4a/0x70
[22138.756435] [<ffffffff811b9184>] mntput_no_expire+0x94/0xf0
[22138.759070] [<ffffffff811bb474>] SyS_umount+0xc4/0x100
[22138.761175] [<ffffffff815ad152>] system_call_fastpath+0x16/0x1b
[22138.763392] ---[ end trace 72065e1b51c7c1cc ]---
That starts in
SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
...
retval = do_umount(mnt, flags);
dput_and_out:
/* we mustn't call path_put() as that would clear mnt_expiry_mark */
dput(path.dentry);
mntput_no_expire(mnt);
out:
return retval;
and hits the warning in that mntput_no_expire call:
static void bdev_inode_switch_bdi(struct inode *inode,
struct backing_dev_info *dst)
...
WARN_ON_ONCE(write_inode_now(inode, true));
The mntput_no_expire call chain doesn't pass return values
back, so umount doesn't report if anything extra went wrong
in the write_inode_now call; it just returns the result
from do_umount. The first problem to the first device
triggers the WARN_ON_ONCE message, but then it's silent
for other afflicted devices.
Every afflicted device does get one of these:
[22141.816183] EXT4-fs error (device sda): ext4_put_super:792: Couldn't clean up the journal
and shutdown was not blocked by these problems.
---
Rob Elliott HP Server Storage