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charset="us-ascii" Content-ID: <416A1ED62C8E3440B9887D33DF0806D6@namprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ0PR04MB7184.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 953fbd35-bb64-4952-e694-08d99ac7fa13 X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Oct 2021 10:36:33.0440 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 6oTngNzManZ6ydgmTZx5xdfDxI2k2eeSqkJPBWbvnQo46u50EYAvlxxUjc2/g9fkTfsWrmnA+wVC1MlLQA+Wy75TLCtYcABaKNG9m2W/XO8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR04MB7725 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Oct 27, 2021 / 10:36, Shinichiro Kawasaki wrote: > On Oct 27, 2021 / 14:06, Yi Zhang wrote: > > Hi Jens > >=20 > > It still can be reproduced with the latest for-next update below, and > > it's 100% reproduced on my x86_64 environment. > >=20 > > 7c5835a8640c (HEAD -> for-next, origin/for-next) Merge branch > > 'for-5.16/scsi-ma' into for-next >=20 > I also observe the null-ptr-deref during blktests block/029 run, using > for-next branch tip, git hash 7c5835a8640c. With my configuration, KASAN > reported null-ptr-deref in blk_mq_map_swqueue(). >=20 > I bisected and found that the commit 0a593fbbc245 ("null_blk: poll queue > support") triggers it. Reverting this commit from the tip of for-next > branch, the KASAN null-ptr-deref message was not observed. The test case block/029 changes /sys/kernel/config/nullb/nullb0/submit_queu= es. When the submit_queues value changes, nr_hw_queue is updated without counti= ng the number of poll_queues. Another test case block/030 also changes the num= ber of submit queues, and shows the same failure symptom. I also tried to change /sys/kernel/config/nullb/nullb0/poll_queues value, a= nd observed the same failure. So, null_blk needs a fix for handling of these attributes. I have created a fix patch and confirmed that the patch avoids the null-ptr-deref. Will post the patch to linux-block list. Review will be appreciated. --=20 Best Regards, Shin'ichiro Kawasaki >=20 > >=20 > > On Tue, Oct 26, 2021 at 10:44 PM Jens Axboe wrote: > > > > > > On 10/26/21 3:33 AM, Yi Zhang wrote: > > > > Hello > > > > > > > > Below NULL pointer was triggered[2] with blktests block/029 on late= st > > > > linux-block/for-next, pls check it. > > > > > > > > [1] > > > > 9b3b463f3955 (HEAD -> for-next, origin/for-next) Merge branch > > > > 'for-5.16/block' into for-next > > > > > > > > [2] > > > > [ 110.508269] run blktests block/029 at 2021-10-26 05:29:11 > > > > [ 110.535182] null_blk: module loaded > > > > [ 110.674174] Kernel attempted to read user page (d8) - exploit > > > > attempt? (uid: 0) > > > > [ 110.674212] BUG: Kernel NULL pointer dereference on read at 0x00= 0000d8 > > > > [ 110.674236] Faulting instruction address: 0xc0000000009414c4 > > > > [ 110.674251] Oops: Kernel access of bad area, sig: 11 [#1] > > > > [ 110.674272] LE PAGE_SIZE=3D64K MMU=3DRadix SMP NR_CPUS=3D2048 NU= MA PowerNV > > > > [ 110.674308] Modules linked in: null_blk rfkill sunrpc joydev ofp= art > > > > ses enclosure scsi_transport_sas i40e at24 powernv_flash mtd > > > > tpm_i2c_nuvoton regmap_i2c ipmi_powernv rtc_opal crct10dif_vpmsum > > > > opal_prd ipmi_devintf i2c_opal ipmi_msghandler fuse zram ip_tables = xfs > > > > ast i2c_algo_bit drm_vram_helper drm_kms_helper syscopyarea > > > > sysfillrect sysimgblt fb_sys_fops cec drm_ttm_helper ttm drm > > > > vmx_crypto crc32c_vpmsum i2c_core aacraid drm_panel_orientation_qui= rks > > > > [ 110.674485] CPU: 60 PID: 3469 Comm: check Not tainted 5.15.0-rc6= + #3 > > > > [ 110.674520] NIP: c0000000009414c4 LR: c000000000941638 CTR: 000= 0000000000000 > > > > [ 110.674556] REGS: c00000003aea77c0 TRAP: 0300 Not tainted (5.= 15.0-rc6+) > > > > [ 110.674580] MSR: 900000000280b033 > > > > CR: 84428482 XER: 00000006 > > > > [ 110.674634] CFAR: c000000000941648 DAR: 00000000000000d8 DSISR: > > > > 40000000 IRQMASK: 0 > > > > [ 110.674634] GPR00: c000000000941638 c00000003aea7a60 > > > > c0000000028a9a00 c00000001ad8a8c0 > > > > [ 110.674634] GPR04: c000000089287e00 0000000000000001 > > > > 00000000ffffffff ffffffffffffffff > > > > [ 110.674634] GPR08: 00000000000000d8 0000000000000000 > > > > 00000000000000d8 0000000000000400 > > > > [ 110.674634] GPR12: 0000000000008000 c000000ffff9e600 > > > > c00000001ac416c0 0000000000000000 > > > > [ 110.674634] GPR16: 0000000000000001 0000000000000001 > > > > 0000000000000000 c009dfffff94f300 > > > > [ 110.674634] GPR20: 0000000000000000 0000000000000000 > > > > c0000000028e72b8 c0000000028e78a0 > > > > [ 110.674634] GPR24: 0000000000000001 0000000000000008 > > > > c0000000aaa53838 c009dfffff94f388 > > > > [ 110.674634] GPR28: c00000009d527698 c009dfffff94f3a0 > > > > 0000000000000002 c0000000aaa53858 > > > > [ 110.674942] NIP [c0000000009414c4] blk_mq_map_swqueue+0x1a4/0x49= 0 > > > > [ 110.674982] LR [c000000000941638] blk_mq_map_swqueue+0x318/0x490 > > > > [ 110.675021] Call Trace: > > > > [ 110.675038] [c00000003aea7a60] [c000000000941638] > > > > blk_mq_map_swqueue+0x318/0x490 (unreliable) > > > > [ 110.675080] [c00000003aea7b10] [c0000000009420e4] > > > > blk_mq_update_nr_hw_queues+0x244/0x480 > > > > [ 110.675128] [c00000003aea7bd0] [c00800000f3e2d60] > > > > nullb_device_submit_queues_store+0x98/0x120 [null_blk] > > > > [ 110.675182] [c00000003aea7c20] [c000000000648aa8] > > > > configfs_write_iter+0x118/0x1e0 > > > > [ 110.675224] [c00000003aea7c70] [c000000000521494] new_sync_write= +0x124/0x1b0 > > > > [ 110.675281] [c00000003aea7d10] [c000000000524794] vfs_write+0x2c= 4/0x390 > > > > [ 110.675299] [c00000003aea7d60] [c000000000524b08] ksys_write+0x7= 8/0x130 > > > > [ 110.675316] [c00000003aea7db0] [c00000000002d648] > > > > system_call_exception+0x188/0x360 > > > > [ 110.675335] [c00000003aea7e10] [c00000000000c1e8] > > > > system_call_vectored_common+0xe8/0x278 > > > > [ 110.675355] --- interrupt: 3000 at 0x7fffa1aefee4 > > > > [ 110.675367] NIP: 00007fffa1aefee4 LR: 0000000000000000 CTR: 000= 0000000000000 > > > > [ 110.675393] REGS: c00000003aea7e80 TRAP: 3000 Not tainted (5.= 15.0-rc6+) > > > > [ 110.675429] MSR: 900000000280f033 > > > > CR: 48422488 XER: 0000000= 0 > > > > [ 110.675482] IRQMASK: 0 > > > > [ 110.675482] GPR00: 0000000000000004 00007fffc592dd30 > > > > 00007fffa1be7000 0000000000000001 > > > > [ 110.675482] GPR04: 0000000143297fc0 0000000000000002 > > > > 0000000000000010 00000001432bd791 > > > > [ 110.675482] GPR08: 0000000000000000 0000000000000000 > > > > 0000000000000000 0000000000000000 > > > > [ 110.675482] GPR12: 0000000000000000 00007fffa1d2afa0 > > > > 0000000000000000 0000000000000000 > > > > [ 110.675482] GPR16: 000000010dfd87b8 000000010dfd94d4 > > > > 0000000020000000 000000010deeae80 > > > > [ 110.675482] GPR20: 0000000000000000 00007fffc592df54 > > > > 000000010df83128 000000010dfd89bc > > > > [ 110.675482] GPR24: 000000010dfd8a50 0000000000000000 > > > > 0000000143297fc0 0000000000000002 > > > > [ 110.675482] GPR28: 0000000000000002 00007fffa1be16d8 > > > > 0000000143297fc0 0000000000000002 > > > > [ 110.675718] NIP [00007fffa1aefee4] 0x7fffa1aefee4 > > > > [ 110.675750] LR [0000000000000000] 0x0 > > > > [ 110.675769] --- interrupt: 3000 > > > > [ 110.675789] Instruction dump: > > > > [ 110.675798] 2c290000 41820168 e91c0600 7bc926e4 e95c0048 7d28482= a > > > > 7d29a82e 79291f24 > > > > [ 110.675845] 7d2a482a f93d0000 390900d8 7d489214 <7d08a02a> 7d088= 839 > > > > 4082004c 7d0050a8 > > > > [ 110.675885] ---[ end trace b9b604499c6b5b71 ]--- > > > > [ 110.814135] > > > > [ 111.814148] Kernel panic - not syncing: Fatal exception > > > > [ 113.674122] ---[ end Kernel panic - not syncing: Fatal exception= ]--- > > > > > > Should be fixed in my current for-next branch. > > > > > > -- > > > Jens Axboe > > > > >=20 > >=20 > > --=20 > > Best Regards, > > Yi Zhang > >=20 >=20 > --=20 > Best Regards, > Shin'ichiro Kawasaki=