I've tried running xfstests before/after and I get NULL ptr derefs from the first test (not consistenly at the time but same error): general protection fault: 0000 [#1] SMP KASAN PTI CPU: 3 PID: 369 Comm: cifsd Not tainted 4.18.0+ #14 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 RIP: 0010:dequeue_mid+0x39/0x60 Code: 53 48 89 fb 48 89 47 40 48 c7 c7 b0 8c 0a 82 e8 fd 98 2f 00 40 80 fd 01 48 8b 13 19 c0 83 e0 f4 83 c0 10 89 43 74 48 8b 43 08 <48> 89 42 08 48 89 10 48 89 1b 48 89 5b 08 c6 05 42 6a e6 00 00 5b RSP: 0018:ffff88003f51fe20 EFLAGS: 00010203 RAX: dead000000000200 RBX: ffff880030a82c00 RCX: ffffffff8153bb53 RDX: dead000000000100 RSI: 0000000000000004 RDI: ffffffff820a8cb0 RBP: 0000000000000000 R08: fffffbfff0415197 R09: fffffbfff0415197 R10: fffffbfff0415196 R11: fffffbfff0415196 R12: 0000000000000000 R13: ffff880030a82c00 R14: ffff88002fc5e660 R15: ffff880030a82c00 FS: 0000000000000000(0000) GS:ffff880033980000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fba363c1650 CR3: 0000000001c0e000 CR4: 00000000000006a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cifs_handle_standard+0x167/0x180 cifs_demultiplex_thread+0x51b/0xb30 kthread+0x126/0x130 ? cifs_handle_standard+0x180/0x180 ? kthread_destroy_worker+0x40/0x40 ret_from_fork+0x35/0x40 This corresponds to the list_del_init() call in dequeue_mid(). Also theres is some weird poison-looking value in the RAX/RDX registers (0xdead...). Cheers -- Aurélien Aptel / SUSE Labs Samba Team GPG: 1839 CB5F 9F5B FB9B AA97 8C99 03C8 A49B 521B D5D3 SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
