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Content-Language: en-GB To: Ming Lei Cc: Christoph Hellwig , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, Jens Axboe , James.Bottomley@hansenpartnership.com, leonro@nvidia.com, kch@nvidia.com, LKML , Madhavan Srinivasan , riteshh@linux.ibm.com, ojaswin@linux.ibm.com References: <9687cf2b-1f32-44e1-b58d-2492dc6e7185@linux.ibm.com> <7382f235-3e42-4b77-b18d-c38661816301@linux.ibm.com> From: Venkat Rao Bagalkote In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=aaJsXBot c=1 sm=1 tr=0 ts=6960f2c5 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=20KFwNOVAAAA:8 a=VnNF1IyMAAAA:8 a=aUi8X5uG0deCfxdNGwwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: Fxe-fhjyR5aGSFocJrcVhLB3-4snsq9r X-Proofpoint-ORIG-GUID: Fxe-fhjyR5aGSFocJrcVhLB3-4snsq9r X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA5MDA5MCBTYWx0ZWRfX/5eWonsFl6Z7 akTumFDal1W/PEY0f54R4fKNM0exmu64X5dY2Fp/6RG8Up+OSCEffVSkREK2BtxVfnGRr4379zv o54RluVFeb0eXZrsKdcrSHs6tQbMu3a1rFHWNWw+79fyC9swrTS3/xDJ87VTAXWfd38ZisKMYTi aH+sZf4iPbGaDpVuC2MzAEnSpjQhey6ghWdU7e/81FXHNEl+RZ4/0fwyQ1F7nbjwQmY5dQkG+UR 7vQl4kpovZXsQsXl7nih0Fo31OEEdlduzxzJasM0phIm6twd+cNP9J1ijzwJGws2JyowGYlQO9g CUm/IbKDSzuLXDoQ7NvwVAiU7dh22d9UNB3VIQI6uOunqzj64WAr9ZviyjDZ8fQvadeSvBLCnkP 8lJ1VMH41TQH7KLfbXpwN/J5xAHetMPVhQQw7Hokar7ioE9vW3kX132gnxi4quNgO5AQ7CKvEl1 Ka2RRvDVLT+A1OYUDVw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-09_03,2026-01-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 phishscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601090090 On 09/01/26 5:25 pm, Ming Lei wrote: > On Fri, Jan 09, 2026 at 05:14:36PM +0530, Venkat Rao Bagalkote wrote: >> On 09/01/26 12:19 pm, Ming Lei wrote: >>> On Thu, Jan 08, 2026 at 09:56:39PM -0800, Christoph Hellwig wrote: >>>> I've seen the same when running xfstests on xfs, and bisected it to: >>>> >>>> commit ee623c892aa59003fca173de0041abc2ccc2c72d >>>> Author: Ming Lei >>>> Date: Wed Dec 31 11:00:55 2025 +0800 >>>> >>>> block: use bvec iterator helper for bio_may_need_split() >>>> >>> Hi Christoph and Venkat Rao Bagalkote, >>> >>> Unfortunately I can't duplicate the issue in my environment, can you test >>> the following patch? >>> >>> diff --git a/block/blk.h b/block/blk.h >>> index 98f4dfd4ec75..980eef1f5690 100644 >>> --- a/block/blk.h >>> +++ b/block/blk.h >>> @@ -380,7 +380,7 @@ static inline bool bio_may_need_split(struct bio *bio, >>> return true; >>> bv = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter); >>> - if (bio->bi_iter.bi_size > bv->bv_len) >>> + if (bio->bi_iter.bi_size > bv->bv_len - bio->bi_iter.bi_bvec_done) >>> return true; >>> return bv->bv_len + bv->bv_offset > lim->max_fast_segment_size; >>> } >> Hello Ming, >> >> >> This is not helping. I am hitting this issue, during kernel build itself. > Can you confirm if it can fix the blktests ext4/056 first? > > If kernel building is running over new patched kernel, please provide the > dmesg log. And if it is reproduciable, can you confirm if it can be fixed > by reverting ee623c892aa59003 (block: use bvec iterator helper for bio_may_need_split())? Unfortunately, even with revert, build fails. commit c64b2ee9cddcb31546c8622ef018d344544a9388 (HEAD) Author: Super User Date:   Fri Jan 9 06:51:19 2026 -0600     Revert "block: use bvec iterator helper for bio_may_need_split()"     This reverts commit ee623c892aa59003fca173de0041abc2ccc2c72d. Dmesg: make -j 48 -s && make modules_install && make install [ 1185.016758] hrtimer: interrupt took 7442 ns [ 1814.191462] ------------[ cut here ]------------ [ 1814.191501] WARNING: block/blk-mq-dma.c:309 at __blk_rq_map_sg+0x220/0x280, CPU#46: kworker/46:0H/253 [ 1814.191540] Modules linked in: bonding tls rfkill nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables sg pseries_rng vmx_crypto fuse loop vsock_loopback vmw_vsock_virtio_transport_common vsock xfs nvme_tcp nvme_fabrics nvme_core sr_mod sd_mod nvme_keyring cdrom nvme_auth hkdf ibmvscsi ibmveth scsi_transport_srp dm_mirror dm_region_hash dm_log dm_mod nfnetlink [ 1814.191886] CPU: 46 UID: 0 PID: 253 Comm: kworker/46:0H Kdump: loaded Not tainted 6.19.0-rc4-next-20260108 #1 VOLUNTARY [ 1814.191917] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries [ 1814.191941] Workqueue: kblockd blk_mq_run_work_fn [ 1814.191971] NIP:  c000000000d05840 LR: c000000000d05828 CTR: 0000000000000000 [ 1814.191992] REGS: c00000000c4e7520 TRAP: 0700   Not tainted (6.19.0-rc4-next-20260108) [ 1814.192014] MSR:  800000000282b033   CR: 44002202  XER: 20040000 [ 1814.192109] CFAR: c0000000008f2b50 IRQMASK: 0 [ 1814.192109] GPR00: c000000000d05798 c00000000c4e77c0 c0000000024ea800 c0000000dc53d17c [ 1814.192109] GPR04: c00000000c4e77f8 c00000000c4e77e8 c000000000d0490c 0000000000000000 [ 1814.192109] GPR08: 0000000001233cd8 0000000000000001 0000000000000000 c0080000070a18e8 [ 1814.192109] GPR12: c0000000011cf6a0 c000000011847300 c0000000002d4c08 c000000007cee280 [ 1814.192109] GPR16: c0000000d0c3e090 0000000000100001 c00000000ace1610 c0000000dc53d118 [ 1814.192109] GPR20: 0000000001233cd8 0000000000000000 c0000000dc53d12c 0000000000007000 [ 1814.192109] GPR24: c0000000dc53d328 fffffffffffffffd c0000000dc53d100 0000000000000002 [ 1814.192109] GPR28: c00000000c4e78a0 0000000000000000 c00c000000b697c0 c0000000af03ab00 [ 1814.192463] NIP [c000000000d05840] __blk_rq_map_sg+0x220/0x280 [ 1814.192488] LR [c000000000d05828] __blk_rq_map_sg+0x208/0x280 [ 1814.192513] Call Trace: [ 1814.192526] [c00000000c4e77c0] [c000000000d05798] __blk_rq_map_sg+0x178/0x280 (unreliable) [ 1814.192565] [c00000000c4e7880] [c0000000011cf7bc] scsi_alloc_sgtables+0x11c/0x700 [ 1814.192601] [c00000000c4e7920] [c008000007097c08] sd_setup_read_write_cmnd+0xf0/0xcd0 [sd_mod] [ 1814.192651] [c00000000c4e7a20] [c0000000011d1ce4] scsi_prepare_cmd+0x324/0x440 [ 1814.192683] [c00000000c4e7a90] [c0000000011d2128] scsi_queue_rq+0x328/0xb00 [ 1814.192723] [c00000000c4e7b50] [c000000000cfad00] blk_mq_dispatch_rq_list+0x270/0x9b0 [ 1814.192756] [c00000000c4e7c00] [c000000000d09100] __blk_mq_do_dispatch_sched+0x580/0x5a0 [ 1814.192790] [c00000000c4e7cb0] [c000000000d09844] __blk_mq_sched_dispatch_requests+0x2b4/0x360 [ 1814.192825] [c00000000c4e7d20] [c000000000d099e4] blk_mq_sched_dispatch_requests+0x74/0x110 [ 1814.192857] [c00000000c4e7d60] [c000000000cef4e8] blk_mq_run_work_fn+0xe8/0x120 [ 1814.192892] [c00000000c4e7da0] [c0000000002c0cac] process_one_work+0x41c/0x8b0 [ 1814.192925] [c00000000c4e7eb0] [c0000000002c149c] worker_thread+0x35c/0x780 [ 1814.192956] [c00000000c4e7f80] [c0000000002d4e14] kthread+0x214/0x230 [ 1814.192986] [c00000000c4e7fe0] [c00000000000ded8] start_kernel_thread+0x14/0x18 [ 1814.193022] Code: 813a001c 39400001 71291000 40820014 387a007c 4bbed2d5 60000000 a15a007c 7c1b5000 39200001 39400000 7d29505e <0b090000> e9410068 e92d0c78 7d4a4a79 [ 1814.193151] ---[ end trace 0000000000000000 ]--- [ 1814.193232] ------------[ cut here ]------------ [ 1814.193248] kernel BUG at drivers/scsi/scsi_lib.c:1173! [ 1814.193266] Oops: Exception in kernel mode, sig: 5 [#1] [ 1814.193284] LE PAGE_SIZE=64K MMU=Hash  SMP NR_CPUS=8192 NUMA pSeries [ 1814.193305] Modules linked in: bonding tls rfkill nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables sg pseries_rng vmx_crypto fuse loop vsock_loopback vmw_vsock_virtio_transport_common vsock xfs nvme_tcp nvme_fabrics nvme_core sr_mod sd_mod nvme_keyring cdrom nvme_auth hkdf ibmvscsi ibmveth scsi_transport_srp dm_mirror dm_region_hash dm_log dm_mod nfnetlink [ 1814.193616] CPU: 46 UID: 0 PID: 253 Comm: kworker/46:0H Kdump: loaded Tainted: G        W           6.19.0-rc4-next-20260108 #1 VOLUNTARY [ 1814.193650] Tainted: [W]=WARN [ 1814.193664] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries [ 1814.193691] Workqueue: kblockd blk_mq_run_work_fn [ 1814.193720] NIP:  c0000000011cf9a0 LR: c0000000011cf988 CTR: 0000000000000000 [ 1814.193743] REGS: c00000000c4e75e0 TRAP: 0700   Tainted: G   W            (6.19.0-rc4-next-20260108) [ 1814.193766] MSR:  800000000282b033   CR: 84002202  XER: 20040000 [ 1814.193864] CFAR: c0000000008f2cf0 IRQMASK: 0 [ 1814.193864] GPR00: c0000000011cf7bc c00000000c4e7880 c0000000024ea800 c0000000dc53d2d0 [ 1814.193864] GPR04: c00000000c4e77f8 c00000000c4e77e8 c000000000d0490c 0000000000000000 [ 1814.193864] GPR08: 0000000000000001 0000000000000001 0000000000000000 c0080000070a18e8 [ 1814.193864] GPR12: c0000000011cf6a0 c000000011847300 c0000000002d4c08 c000000007cee280 [ 1814.193864] GPR16: c0000000d0c3e090 0000000000100001 c00000000ace1610 c0000000dc53d118 [ 1814.193864] GPR20: 0000000000010000 0000000000000000 c0000000dc53d12c 0000000000000002 [ 1814.193864] GPR24: c0000000dc53d2c8 0000000000000002 c0000000d0be4828 c0000000dc53d11c [ 1814.193864] GPR28: c0000000dc53d100 c0000000dc53d2d0 c0000000d4315a90 c0000000dc53d200 [ 1814.194193] NIP [c0000000011cf9a0] scsi_alloc_sgtables+0x300/0x700 [ 1814.194218] LR [c0000000011cf988] scsi_alloc_sgtables+0x2e8/0x700 [ 1814.194241] Call Trace: [ 1814.194253] [c00000000c4e7880] [c0000000011cf7bc] scsi_alloc_sgtables+0x11c/0x700 (unreliable) [ 1814.194289] [c00000000c4e7920] [c008000007097c08] sd_setup_read_write_cmnd+0xf0/0xcd0 [sd_mod] [ 1814.194335] [c00000000c4e7a20] [c0000000011d1ce4] scsi_prepare_cmd+0x324/0x440 [ 1814.194367] [c00000000c4e7a90] [c0000000011d2128] scsi_queue_rq+0x328/0xb00 [ 1814.194397] [c00000000c4e7b50] [c000000000cfad00] blk_mq_dispatch_rq_list+0x270/0x9b0 [ 1814.194428] [c00000000c4e7c00] [c000000000d09100] __blk_mq_do_dispatch_sched+0x580/0x5a0 [ 1814.194465] [c00000000c4e7cb0] [c000000000d09844] __blk_mq_sched_dispatch_requests+0x2b4/0x360 [ 1814.194499] [c00000000c4e7d20] [c000000000d099e4] blk_mq_sched_dispatch_requests+0x74/0x110 [ 1814.194532] [c00000000c4e7d60] [c000000000cef4e8] blk_mq_run_work_fn+0xe8/0x120 [ 1814.194564] [c00000000c4e7da0] [c0000000002c0cac] process_one_work+0x41c/0x8b0 [ 1814.194595] [c00000000c4e7eb0] [c0000000002c149c] worker_thread+0x35c/0x780 [ 1814.194626] [c00000000c4e7f80] [c0000000002d4e14] kthread+0x214/0x230 [ 1814.194659] [c00000000c4e7fe0] [c00000000000ded8] start_kernel_thread+0x14/0x18 [ 1814.194689] Code: 813f0110 7d295214 913f0110 3bbf00d0 7fa3eb78 4b723315 60000000 811f00d0 39400000 39200001 7c08b840 7d29501e <0b090000> 7f63db78 92ff00d0 4b7232ed [ 1814.194820] ---[ end trace 0000000000000000 ]--- [ 1814.216370] pstore: backend (nvram) writing error (-1) Logs: make -j 48 -s && make modules_install && make install [ 1185.016758] hrtimer: interrupt took 7442 ns [ 1814.191462] ------------[ cut here ]------------ [ 1814.191501] WARNING: block/blk-mq-dma.c:309 at __blk_rq_map_sg+0x220/0x280, CPU#46: kworker/46:0H/253 [ 1814.191540] Modules linked in: bonding tls rfkill nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables sg pseries_rng vmx_crypto fuse loop vsock_loopback vmw_vsock_virtio_transport_common vsock xfs nvme_tcp nvme_fabrics nvme_core sr_mod sd_mod nvme_keyring cdrom nvme_auth hkdf ibmvscsi ibmveth scsi_transport_srp dm_mirror dm_region_hash dm_log dm_mod nfnetlink [ 1814.191886] CPU: 46 UID: 0 PID: 253 Comm: kworker/46:0H Kdump: loaded Not tainted 6.19.0-rc4-next-20260108 #1 VOLUNTARY [ 1814.191917] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries [ 1814.191941] Workqueue: kblockd blk_mq_run_work_fn [ 1814.191971] NIP:  c000000000d05840 LR: c000000000d05828 CTR: 0000000000000000 [ 1814.191992] REGS: c00000000c4e7520 TRAP: 0700   Not tainted (6.19.0-rc4-next-20260108) [ 1814.192014] MSR:  800000000282b033   CR: 44002202  XER: 20040000 [ 1814.192109] CFAR: c0000000008f2b50 IRQMASK: 0 [ 1814.192109] GPR00: c000000000d05798 c00000000c4e77c0 c0000000024ea800 c0000000dc53d17c [ 1814.192109] GPR04: c00000000c4e77f8 c00000000c4e77e8 c000000000d0490c 0000000000000000 [ 1814.192109] GPR08: 0000000001233cd8 0000000000000001 0000000000000000 c0080000070a18e8 [ 1814.192109] GPR12: c0000000011cf6a0 c000000011847300 c0000000002d4c08 c000000007cee280 [ 1814.192109] GPR16: c0000000d0c3e090 0000000000100001 c00000000ace1610 c0000000dc53d118 [ 1814.192109] GPR20: 0000000001233cd8 0000000000000000 c0000000dc53d12c 0000000000007000 [ 1814.192109] GPR24: c0000000dc53d328 fffffffffffffffd c0000000dc53d100 0000000000000002 [ 1814.192109] GPR28: c00000000c4e78a0 0000000000000000 c00c000000b697c0 c0000000af03ab00 [ 1814.192463] NIP [c000000000d05840] __blk_rq_map_sg+0x220/0x280 [ 1814.192488] LR [c000000000d05828] __blk_rq_map_sg+0x208/0x280 [ 1814.192513] Call Trace: [ 1814.192526] [c00000000c4e77c0] [c000000000d05798] __blk_rq_map_sg+0x178/0x280 (unreliable) [ 1814.192565] [c00000000c4e7880] [c0000000011cf7bc] scsi_alloc_sgtables+0x11c/0x700 [ 1814.192601] [c00000000c4e7920] [c008000007097c08] sd_setup_read_write_cmnd+0xf0/0xcd0 [sd_mod] [ 1814.192651] [c00000000c4e7a20] [c0000000011d1ce4] scsi_prepare_cmd+0x324/0x440 [ 1814.192683] [c00000000c4e7a90] [c0000000011d2128] scsi_queue_rq+0x328/0xb00 [ 1814.192723] [c00000000c4e7b50] [c000000000cfad00] blk_mq_dispatch_rq_list+0x270/0x9b0 [ 1814.192756] [c00000000c4e7c00] [c000000000d09100] __blk_mq_do_dispatch_sched+0x580/0x5a0 [ 1814.192790] [c00000000c4e7cb0] [c000000000d09844] __blk_mq_sched_dispatch_requests+0x2b4/0x360 [ 1814.192825] [c00000000c4e7d20] [c000000000d099e4] blk_mq_sched_dispatch_requests+0x74/0x110 [ 1814.192857] [c00000000c4e7d60] [c000000000cef4e8] blk_mq_run_work_fn+0xe8/0x120 [ 1814.192892] [c00000000c4e7da0] [c0000000002c0cac] process_one_work+0x41c/0x8b0 [ 1814.192925] [c00000000c4e7eb0] [c0000000002c149c] worker_thread+0x35c/0x780 [ 1814.192956] [c00000000c4e7f80] [c0000000002d4e14] kthread+0x214/0x230 [ 1814.192986] [c00000000c4e7fe0] [c00000000000ded8] start_kernel_thread+0x14/0x18 [ 1814.193022] Code: 813a001c 39400001 71291000 40820014 387a007c 4bbed2d5 60000000 a15a007c 7c1b5000 39200001 39400000 7d29505e <0b090000> e9410068 e92d0c78 7d4a4a79 [ 1814.193151] ---[ end trace 0000000000000000 ]--- [ 1814.193232] ------------[ cut here ]------------ [ 1814.193248] kernel BUG at drivers/scsi/scsi_lib.c:1173! [ 1814.193266] Oops: Exception in kernel mode, sig: 5 [#1] [ 1814.193284] LE PAGE_SIZE=64K MMU=Hash  SMP NR_CPUS=8192 NUMA pSeries [ 1814.193305] Modules linked in: bonding tls rfkill nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables sg pseries_rng vmx_crypto fuse loop vsock_loopback vmw_vsock_virtio_transport_common vsock xfs nvme_tcp nvme_fabrics nvme_core sr_mod sd_mod nvme_keyring cdrom nvme_auth hkdf ibmvscsi ibmveth scsi_transport_srp dm_mirror dm_region_hash dm_log dm_mod nfnetlink [ 1814.193616] CPU: 46 UID: 0 PID: 253 Comm: kworker/46:0H Kdump: loaded Tainted: G        W           6.19.0-rc4-next-20260108 #1 VOLUNTARY [ 1814.193650] Tainted: [W]=WARN [ 1814.193664] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries [ 1814.193691] Workqueue: kblockd blk_mq_run_work_fn [ 1814.193720] NIP:  c0000000011cf9a0 LR: c0000000011cf988 CTR: 0000000000000000 [ 1814.193743] REGS: c00000000c4e75e0 TRAP: 0700   Tainted: G   W            (6.19.0-rc4-next-20260108) [ 1814.193766] MSR:  800000000282b033   CR: 84002202  XER: 20040000 [ 1814.193864] CFAR: c0000000008f2cf0 IRQMASK: 0 [ 1814.193864] GPR00: c0000000011cf7bc c00000000c4e7880 c0000000024ea800 c0000000dc53d2d0 [ 1814.193864] GPR04: c00000000c4e77f8 c00000000c4e77e8 c000000000d0490c 0000000000000000 [ 1814.193864] GPR08: 0000000000000001 0000000000000001 0000000000000000 c0080000070a18e8 [ 1814.193864] GPR12: c0000000011cf6a0 c000000011847300 c0000000002d4c08 c000000007cee280 [ 1814.193864] GPR16: c0000000d0c3e090 0000000000100001 c00000000ace1610 c0000000dc53d118 [ 1814.193864] GPR20: 0000000000010000 0000000000000000 c0000000dc53d12c 0000000000000002 [ 1814.193864] GPR24: c0000000dc53d2c8 0000000000000002 c0000000d0be4828 c0000000dc53d11c [ 1814.193864] GPR28: c0000000dc53d100 c0000000dc53d2d0 c0000000d4315a90 c0000000dc53d200 [ 1814.194193] NIP [c0000000011cf9a0] scsi_alloc_sgtables+0x300/0x700 [ 1814.194218] LR [c0000000011cf988] scsi_alloc_sgtables+0x2e8/0x700 [ 1814.194241] Call Trace: [ 1814.194253] [c00000000c4e7880] [c0000000011cf7bc] scsi_alloc_sgtables+0x11c/0x700 (unreliable) [ 1814.194289] [c00000000c4e7920] [c008000007097c08] sd_setup_read_write_cmnd+0xf0/0xcd0 [sd_mod] [ 1814.194335] [c00000000c4e7a20] [c0000000011d1ce4] scsi_prepare_cmd+0x324/0x440 [ 1814.194367] [c00000000c4e7a90] [c0000000011d2128] scsi_queue_rq+0x328/0xb00 [ 1814.194397] [c00000000c4e7b50] [c000000000cfad00] blk_mq_dispatch_rq_list+0x270/0x9b0 [ 1814.194428] [c00000000c4e7c00] [c000000000d09100] __blk_mq_do_dispatch_sched+0x580/0x5a0 [ 1814.194465] [c00000000c4e7cb0] [c000000000d09844] __blk_mq_sched_dispatch_requests+0x2b4/0x360 [ 1814.194499] [c00000000c4e7d20] [c000000000d099e4] blk_mq_sched_dispatch_requests+0x74/0x110 [ 1814.194532] [c00000000c4e7d60] [c000000000cef4e8] blk_mq_run_work_fn+0xe8/0x120 [ 1814.194564] [c00000000c4e7da0] [c0000000002c0cac] process_one_work+0x41c/0x8b0 [ 1814.194595] [c00000000c4e7eb0] [c0000000002c149c] worker_thread+0x35c/0x780 [ 1814.194626] [c00000000c4e7f80] [c0000000002d4e14] kthread+0x214/0x230 [ 1814.194659] [c00000000c4e7fe0] [c00000000000ded8] start_kernel_thread+0x14/0x18 [ 1814.194689] Code: 813f0110 7d295214 913f0110 3bbf00d0 7fa3eb78 4b723315 60000000 811f00d0 39400000 39200001 7c08b840 7d29501e <0b090000> 7f63db78 92ff00d0 4b7232ed [ 1814.194820] ---[ end trace 0000000000000000 ]--- [ 1814.216370] pstore: backend (nvram) writing error (-1) Regards, Venkat. > > > Thanks, > Ming > >