Hello, When testing commit "8a084036f2bc - v5.14.2-rt21" from https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git during "cifsv3.11" test part of xfstests [1] we hit the following issue: [13099.772703] BUG: sleeping function called from invalid context at mm/vmalloc.c:2664 [13099.772709] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 613586, name: cifsd [13099.772712] 1 lock held by cifsd/613586: [13099.772715] #0: ffffffffc0eb76d8 (&GlobalMid_Lock){+.+.}-{2:2}, at: cifs_mid_q_entry_release+0x15/0x110 [cifs] [13099.772816] CPU: 7 PID: 613586 Comm: cifsd Not tainted 5.14.2-rt21 #1 [13099.772820] Hardware name: AMD Pike/Pike, BIOS RPK1506A 09/03/2014 [13099.772822] Call Trace: [13099.772828] dump_stack_lvl+0x57/0x72 [13099.772838] ___might_sleep.cold+0xb6/0xc6 [13099.772845] vfree+0x3f/0x50 [13099.772852] put_task_stack+0xcf/0x140 [13099.772858] __put_task_struct+0x46/0x180 [13099.772862] cifs_mid_q_entry_release+0xce/0x110 [cifs] [13099.772944] cifs_demultiplex_thread+0x797/0xcb0 [cifs] [13099.773031] ? mutex_is_locked+0x1/0x20 [13099.773042] ? _raw_spin_unlock_irqrestore+0x37/0x40 [13099.773050] ? cifs_handle_standard+0x190/0x190 [cifs] [13099.773121] kthread+0x15c/0x180 [13099.773126] ? set_kthread_struct+0x40/0x40 [13099.773134] ret_from_fork+0x22/0x30 So far we've hit this problem just once, more logs can be found at [2]. [1] https://gitlab.com/cki-project/kernel-tests/-/tree/main/filesystems/xfs/xfstests [2] https://arr-cki-prod-datawarehouse-public.s3.amazonaws.com/index.html?prefix=datawarehouse-public/2021/09/13/369543188/build_x86_64_redhat%3A1584042034/tests/xfstests_cifsv3_11/ Thank you, Bruno
