On 1/19/18 12:00 PM, Bart Van Assche wrote: > This patch avoids that workloads with large block sizes (megabytes) > can trigger the following call stack with the ib_srpt driver (that > driver is the only driver that chains scatterlists allocated by > sgl_alloc_order()): > > BUG: Bad page state in process kworker/0:1H pfn:2423a78 > page:fffffb03d08e9e00 count:-3 mapcount:0 mapping: (null) index:0x0 > flags: 0x57ffffc0000000() > raw: 0057ffffc0000000 0000000000000000 0000000000000000 fffffffdffffffff > raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000 > page dumped because: nonzero _count > CPU: 0 PID: 733 Comm: kworker/0:1H Tainted: G I 4.15.0-rc7.bart+ #1 > Hardware name: HP ProLiant DL380 G7, BIOS P67 08/16/2015 > Workqueue: ib-comp-wq ib_cq_poll_work [ib_core] > Call Trace: > dump_stack+0x5c/0x83 > bad_page+0xf5/0x10f > get_page_from_freelist+0xa46/0x11b0 > __alloc_pages_nodemask+0x103/0x290 > sgl_alloc_order+0x101/0x180 > target_alloc_sgl+0x2c/0x40 [target_core_mod] > srpt_alloc_rw_ctxs+0x173/0x2d0 [ib_srpt] > srpt_handle_new_iu+0x61e/0x7f0 [ib_srpt] > __ib_process_cq+0x55/0xa0 [ib_core] > ib_cq_poll_work+0x1b/0x60 [ib_core] > process_one_work+0x141/0x340 > worker_thread+0x47/0x3e0 > kthread+0xf5/0x130 > ret_from_fork+0x1f/0x30 Applied, thanks. -- Jens Axboe
