Hello everybody! I reported this issue at LKML [0] but received no answer. Hopefully linux-scsi is a better place... Beginning with linux 3.19 I see an iSCSI regressen. This works perfectly with linux 3.18.x (tested with 3.18.6) and before. Effected kernels I tested are 3.19.0, 3.19.2 and 4.0rc4.r199.gb314aca. The logs tell the story: Feb 19 11:26:49 thebe kernel: scsi host6: iSCSI Initiator over TCP/IP Feb 19 11:26:49 thebe kernel: scsi 6:0:0:0: Direct-Access QNAP iSCSI Storage 4.0 PQ: 0 ANSI: 5 Feb 19 11:26:49 thebe kernel: sd 6:0:0:0: [sdb] 1073741824 512-byte logical blocks: (549 GB/512 GiB) Feb 19 11:26:49 thebe kernel: sd 6:0:0:0: [sdb] Write Protect is off Feb 19 11:26:49 thebe kernel: sd 6:0:0:0: [sdb] Mode Sense: 2f 00 00 00 Feb 19 11:26:49 thebe kernel: sd 6:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA Feb 19 11:26:49 thebe kernel: sdb: unknown partition table Feb 19 11:26:49 thebe kernel: sd 6:0:0:0: [sdb] Attached SCSI disk Feb 19 11:26:49 thebe iscsid[10804]: Connection1:0 to [target: iqn.2004-04.com.qnap:ts-859:iscsi.xxxxxxx.c40a18, portal: xx.xx.xx.xx,3260] through [iface: default] is operational now Feb 19 11:26:57 thebe kernel: sdb: unknown partition table Feb 19 11:28:20 thebe kernel: EXT4-fs (dm-8): mounting with "discard" option, but the device does not support discard Feb 19 11:28:20 thebe kernel: EXT4-fs (dm-8): mounted filesystem with ordered data mode. Opts: (null) Feb 19 11:28:24 thebe kernel: sd 6:0:0:0: [sdb] UNKNOWN Result: hostbyte=0x00 driverbyte=0x08 Feb 19 11:28:24 thebe kernel: sd 6:0:0:0: [sdb] Sense Key : 0x5 [current] Feb 19 11:28:24 thebe kernel: sd 6:0:0:0: [sdb] ASC=0x24 ASCQ=0x0 Feb 19 11:28:24 thebe kernel: sd 6:0:0:0: [sdb] CDB: Feb 19 11:28:24 thebe kernel: cdb[0]=0x2a: 2a 00 34 5b 07 ff 00 2f 88 00 Feb 19 11:28:24 thebe kernel: blk_update_request: critical target error, dev sdb, sector 878381055 Feb 19 11:28:24 thebe kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -121 writing to inode 33196503 (offset 8388608 size 7278592 starting block 108749056) Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749056 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749057 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749058 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749059 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749060 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749061 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749062 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749063 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749064 Feb 19 11:28:24 thebe kernel: Buffer I/O error on device dm-8, logical block 108749065 Feb 19 11:28:24 thebe kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -121 writing to inode 33196503 (offset 8388608 size 7278592 starting block 108749312) Feb 19 11:28:24 thebe kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -121 writing to inode 33196503 (offset 8388608 size 7278592 starting block 108749568) Feb 19 11:28:24 thebe kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -121 writing to inode 33196503 (offset 8388608 size 7278592 starting block 108749824) Feb 19 11:28:24 thebe kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -121 writing to inode 33196503 (offset 8388608 size 7278592 starting block 108750080) Feb 19 11:28:24 thebe kernel: EXT4-fs warning (device dm-8): ext4_end_bio:317: I/O error -121 writing to inode 33196503 (offset 8388608 size 7278592 starting block 108750336) Feb 19 11:29:10 thebe kernel: sd 6:0:0:0: [sdb] UNKNOWN Result: hostbyte=0x00 driverbyte=0x08 Feb 19 11:29:10 thebe kernel: sd 6:0:0:0: [sdb] Sense Key : 0x5 [current] Feb 19 11:29:10 thebe kernel: sd 6:0:0:0: [sdb] ASC=0x24 ASCQ=0x0 Feb 19 11:29:10 thebe kernel: sd 6:0:0:0: [sdb] CDB: Feb 19 11:29:10 thebe kernel: cdb[0]=0x2a: 2a 00 20 44 89 17 00 20 50 00 Feb 19 11:29:10 thebe kernel: blk_update_request: critical target error, dev sdb, sector 541362455 Feb 19 11:29:10 thebe kernel: Buffer I/O error on dev dm-8, logical block 66621731, lost sync page write Feb 19 11:29:10 thebe kernel: Aborting journal on device dm-8-8. Feb 19 11:29:10 thebe kernel: EXT4-fs error (device dm-8): ext4_journal_check_start:56: Detected aborted journal Feb 19 11:29:10 thebe kernel: EXT4-fs (dm-8): Remounting filesystem read-only Feb 19 11:29:20 thebe kernel: EXT4-fs error (device dm-8): ext4_put_super:780: Couldn't clean up the journal [0] https://lkml.org/lkml/2015/2/19/91 -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Chris get my mail address: */=0;b=c[a++];) putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}
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