(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Fri, 08 Jun 2018 16:25:31 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=199999 > > Bug ID: 199999 > Summary: memremap attempted on mixed range lockup. > Product: Memory Management > Version: 2.5 > Kernel Version: 4.14.48 > Hardware: All > OS: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Other > Assignee: akpm@xxxxxxxxxxxxxxxxxxxx > Reporter: me@xxxxxxxxxxxxx > Regression: No That WARN_ON in memremap() (soon perhaps devm_memremap_pages()) is triggering on /dev/mem. > hello. I was poking around and for no real reason, I did cat /dev/mem and > strings /dev/mem. > Then I saw the following warning in dmesg. I saved it and rebooted immediately. > > Jun 08 19:07:25 hades kernel: memremap attempted on mixed range > 0x000000000009c000 size: 0x1000 > Jun 08 19:07:25 hades kernel: ------------[ cut here ]------------ > Jun 08 19:07:25 hades kernel: WARNING: CPU: 0 PID: 11810 at > kernel/memremap.c:98 memremap+0x104/0x170 > Jun 08 19:07:25 hades kernel: Modules linked in: button isofs udf crc_itu_t > loop nls_iso8859_1 nls_cp437 vfat fat uas usb_storage fuse bsd_comp > ipt_MASQUERADE nf_nat_masquerade_ipv4 act_police sch_ingress cls_u32 sch_sfq > iptable_nat nf_c> > Jun 08 19:07:25 hades kernel: thermal snd_pcm snd_timer snd video soundcore > shpchp mei_me mei fan i2c_i801 acpi_pad sch_fq_codel nvidia_uvm(PO) nvidia(PO) > ipmi_devintf ipmi_msghandler nbd crypto_user ip_tables x_tables ext4 > crc32c_gener> > Jun 08 19:07:25 hades kernel: CPU: 0 PID: 11810 Comm: strings Tainted: P > O 4.14.48-1-lts #1 > Jun 08 19:07:25 hades kernel: Hardware name: LENOVO 90DA00D7AD/SKYBAY, BIOS > FYKT58A 06/02/2016 > Jun 08 19:07:25 hades kernel: task: ffff9393c0be3b00 task.stack: > ffffb41287a3c000 > Jun 08 19:07:25 hades kernel: RIP: 0010:memremap+0x104/0x170 > Jun 08 19:07:25 hades kernel: RSP: 0018:ffffb41287a3fdc8 EFLAGS: 00010282 > Jun 08 19:07:25 hades kernel: RAX: 0000000000000041 RBX: 0000000000000000 RCX: > 0000000000000000 > Jun 08 19:07:25 hades kernel: RDX: 0000000000000000 RSI: ffff9396bec165d8 RDI: > ffff9396bec165d8 > Jun 08 19:07:25 hades kernel: RBP: 0000000000000001 R08: 0000000000000412 R09: > 0000000000000004 > Jun 08 19:07:25 hades kernel: R10: 0000000000000000 R11: 0000000000000001 R12: > 0000000000001000 > Jun 08 19:07:25 hades kernel: R13: 000055630d83b020 R14: ffff9396a5ec3000 R15: > 0000000000000000 > Jun 08 19:07:25 hades kernel: FS: 00007fa2611ddb80(0000) > GS:ffff9396bec00000(0000) knlGS:0000000000000000 > Jun 08 19:07:25 hades kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > Jun 08 19:07:25 hades kernel: CR2: 000055630d83c028 CR3: 00000001d5388006 CR4: > 00000000003606f0 > Jun 08 19:07:25 hades kernel: Call Trace: > Jun 08 19:07:25 hades kernel: xlate_dev_mem_ptr+0x25/0x40 > Jun 08 19:07:25 hades kernel: read_mem+0x89/0x1a0 > Jun 08 19:07:25 hades kernel: __vfs_read+0x36/0x170 > Jun 08 19:07:25 hades kernel: ? __fsnotify_parent+0x91/0x120 > Jun 08 19:07:25 hades kernel: vfs_read+0x89/0x130 > Jun 08 19:07:25 hades kernel: SyS_read+0x52/0xc0 > Jun 08 19:07:25 hades kernel: do_syscall_64+0x67/0x120 > Jun 08 19:07:25 hades kernel: entry_SYSCALL_64_after_hwframe+0x3d/0xa2 > Jun 08 19:07:25 hades kernel: RIP: 0033:0x7fa2609fd4a1 > Jun 08 19:07:25 hades kernel: RSP: 002b:00007ffef180bb58 EFLAGS: 00000246 > ORIG_RAX: 0000000000000000 > Jun 08 19:07:25 hades kernel: RAX: ffffffffffffffda RBX: 000055630d818470 RCX: > 00007fa2609fd4a1 > Jun 08 19:07:25 hades kernel: RDX: 0000000000001000 RSI: 000055630d83b020 RDI: > 0000000000000003 > Jun 08 19:07:25 hades kernel: RBP: 0000000000000d68 R08: 0000000000000000 R09: > 0000000000000004 > Jun 08 19:07:25 hades kernel: R10: 0000000000000000 R11: 0000000000000246 R12: > 00007fa260c94720 > Jun 08 19:07:25 hades kernel: R13: 00007fa260c95260 R14: 00007ffef180bc14 R15: > 00007ffef180bc08 > Jun 08 19:07:25 hades kernel: Code: 48 83 c4 08 5b 5d 41 5c c3 80 3d 18 de f5 > 00 00 75 b7 4c 89 e2 48 89 e6 48 c7 c7 e8 db df 90 c6 05 02 de f5 00 01 e8 07 > fa f4 ff <0f> 0b eb 9a 4c 89 e6 48 89 df e8 0d f8 ed ff 48 85 c0 74 99 48 > Jun 08 19:07:25 hades kernel: ---[ end trace 5bdcf881c57b4daa ]--- > > -- > You are receiving this mail because: > You are the assignee for the bug.
