Running the trinity fuzzer with a non-root user on an aarch64 server with the latest mainline (rc2) generated this,
[ 378.743211] WARNING: CPU: 31 PID: 15473 at lib/iov_iter.c:1109 iov_iter_pipe+0xe0/0xe8 [ 378.751590] Modules linked in: bridge 8021q garp mrp stp llc dlci tcp_diag inet_diag af_key pptp gre l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc crypto_user ib_core nfnetlink scsi_transport_iscsi atm sctp vfat fat ghash_ce sha2_ce sha256_arm64 sha1_ce ses enclosure ipmi_ssif sg ipmi_si ipmi_devintf sbsa_gwdt ipmi_msghandler sch_fq_codel xfs libcrc32c marvell mpt3sas mlx5_core raid_class hibmc_drm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm ixgbe hisi_sas_v2_hw igb hisi_sas_main libsas hns_dsaf mlxfw devlink hns_enet_drv mdio i2c_designware_platform i2c_algo_bit i2c_designware_core ehci_platform scsi_transport_sas hns_mdio hnae dm_mirror dm_region_hash dm_log dm_mod [ 378.816574] CPU: 31 PID: 15473 Comm: trinity-c168 Kdump: loaded Tainted: G W 4.20.0-rc2+ #16 [ 378.826317] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.50 06/01/2018 [ 378.833542] pstate: 60000005 (nZCv daif -PAN -UAO) [ 378.838344] pc : iov_iter_pipe+0xe0/0xe8 [ 378.842268] lr : iov_iter_pipe+0x40/0xe8 [ 378.846191] sp : ffff801e101a78e0 [ 378.849506] x29: ffff801e101a78e0 x28: ffff801e101a7c48 [ 378.854823] x27: 0000000000000004 x26: ffff801668e511c0 [ 378.860139] x25: 0000000000000003 x24: ffff801e0f989148 [ 378.865456] x23: ffff801e0f989150 x22: 0000000000000010 [ 378.870778] x21: 000000005ffffffd x20: ffff801e0f989080 [ 378.876098] x19: ffff801e101a79b0 x18: 0000000000000000 [ 378.881415] x17: 0000000000000001 x16: 0000000000000000 [ 378.886732] x15: 0000000000000000 x14: 0000000000000000 [ 378.892047] x13: 0000000000000000 x12: ffff1003c2034f38 [ 378.897363] x11: 1ffff003c2034f37 x10: ffff1003c2034f37 [ 378.902678] x9 : 0000000000000000 x8 : 00000000f1f1f1f1 [ 378.907994] x7 : dfff200000000000 x6 : 00000000f2f2f2f2 [ 378.913309] x5 : 00000000f2f2f200 x4 : dfff200000000000 [ 378.918625] x3 : 000000005ffffffd x2 : 0000000000000003 [ 378.923942] x1 : ffff801e0f989150 x0 : 0000000000000010 [ 378.929259] Call trace: [ 378.931712] iov_iter_pipe+0xe0/0xe8 [ 378.935294] generic_file_splice_read+0xb0/0x308 [ 378.939914] do_splice_to+0xa4/0xd8 [ 378.943406] splice_direct_to_actor+0x164/0x3b8 [ 378.947942] do_splice_direct+0x148/0x1c8 [ 378.951959] do_sendfile+0x2e4/0x568 [ 378.955539] __arm64_sys_sendfile64+0x14c/0x268 [ 378.960076] el0_svc_handler+0xd4/0x198 [ 378.963914] el0_svc+0x8/0xc [ 378.966796] irq event stamp: 56628 [ 378.970202] hardirqs last enabled at (56627): [<ffff2000084cf7c4>] quarantine_put+0xbc/0x170 [ 378.978729] hardirqs last disabled at (56628): [<ffff200008081490>] do_debug_exception+0xd8/0x190 [ 378.987605] softirqs last enabled at (56380): [<ffff200008082210>] __do_softirq+0x7c8/0x9c8 [ 378.996048] softirqs last disabled at (56373): [<ffff20000812dbe4>] irq_exit+0x25c/0x2f0 [ 379.004139] ---[ end trace 598902d30712b79d ]---