On Fri, 10 Jul 2020 at 00:42, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Wed, Jul 8, 2020 at 10:28 PM Naresh Kamboju > <naresh.kamboju@xxxxxxxxxx> wrote: > > > > While running LTP mm test suite on i386 or qemu_i386 this kernel warning > > has been noticed from stable 5.4 to stable 5.7 branches and mainline 5.8.0-rc4 > > and linux next. > > Hmm > > If this is repeatable, would you mind making the warning also print > out the old range and new addresses and pmd value? Your patch applied and re-tested. warning triggered 10 times. old: bfe00000-c0000000 new: bfa00000 (val: 7d530067) Here is the crash output log, thp01.c:98: PASS: system didn't crash. [ 741.507000] ------------[ cut here ]------------ [ 741.511684] WARNING: CPU: 1 PID: 15173 at mm/mremap.c:211 move_page_tables.cold+0x0/0x2b [ 741.519812] Modules linked in: x86_pkg_temp_thermal fuse [ 741.525163] CPU: 1 PID: 15173 Comm: true Not tainted 5.8.0-rc4 #1 [ 741.531313] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.2 05/23/2018 [ 741.538760] EIP: move_page_tables.cold+0x0/0x2b [ 741.543337] Code: b1 a0 03 00 00 81 c1 cc 04 00 00 bb ea ff ff ff 51 68 e0 bc 68 d8 c6 05 dc 29 97 d8 01 e8 13 26 e9 ff 83 c4 0c e9 70 ea ff ff <0f> 0b 52 50 ff 75 08 ff 75 b4 ff 75 d4 68 3c bd 68 d8 e8 f4 25 e9 [ 741.562140] EAX: 7d530067 EBX: e9c90ff8 ECX: 00000000 EDX: 00000000 [ 741.568456] ESI: 00000000 EDI: 7d5ba007 EBP: cef67dd0 ESP: cef67d28 [ 741.574776] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010202 [ 741.581623] CR0: 80050033 CR2: b7d53f50 CR3: 107da000 CR4: 003406f0 [ 741.587941] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 741.594259] DR6: fffe0ff0 DR7: 00000400 [ 741.598159] Call Trace: [ 741.600694] setup_arg_pages+0x22b/0x310 [ 741.604654] ? _raw_spin_unlock_irqrestore+0x45/0x50 [ 741.609677] ? trace_hardirqs_on+0x4b/0x110 [ 741.613930] ? get_random_u32+0x4e/0x80 [ 741.617809] ? get_random_u32+0x4e/0x80 [ 741.621687] load_elf_binary+0x31e/0x10f0 [ 741.625714] ? __do_execve_file+0x5b4/0xbf0 [ 741.629917] ? find_held_lock+0x24/0x80 [ 741.633839] __do_execve_file+0x5a8/0xbf0 [ 741.637893] __ia32_sys_execve+0x2a/0x40 [ 741.641875] do_syscall_32_irqs_on+0x3d/0x2c0 [ 741.646246] ? find_held_lock+0x24/0x80 [ 741.650105] ? lock_release+0x8a/0x260 [ 741.653890] ? __might_fault+0x41/0x80 [ 741.657660] do_fast_syscall_32+0x60/0xf0 [ 741.661691] do_SYSENTER_32+0x15/0x20 [ 741.665373] entry_SYSENTER_32+0x9f/0xf2 [ 741.669328] EIP: 0xb7f38549 [ 741.672140] Code: Bad RIP value. [ 741.675430] EAX: ffffffda EBX: bfe19bf0 ECX: 08067420 EDX: bfe19e24 [ 741.681708] ESI: 08058a14 EDI: bfe19bf9 EBP: bfe19c98 ESP: bfe19bc8 [ 741.687991] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000292 [ 741.694804] irq event stamp: 23911 [ 741.698253] hardirqs last enabled at (23929): [<d756f075>] console_unlock+0x4a5/0x610 [ 741.706181] hardirqs last disabled at (23946): [<d756ec5a>] console_unlock+0x8a/0x610 [ 741.714041] softirqs last enabled at (23962): [<d82b975c>] __do_softirq+0x2dc/0x3da [ 741.721849] softirqs last disabled at (23973): [<d74a8275>] call_on_stack+0x45/0x50 [ 741.729513] ---[ end trace 170f646c1b6225e0 ]--- [ 741.734151] old: bfe00000-c0000000 new: bfa00000 (val: 7d530067) Build link: https://builds.tuxbuild.com/1cwiUvFIB4M0hPyB1eA3cA/ vmlinux: https://builds.tuxbuild.com/1cwiUvFIB4M0hPyB1eA3cA/vmlinux.xz system.map: https://builds.tuxbuild.com/1cwiUvFIB4M0hPyB1eA3cA/System.map full test log, https://lkft.validation.linaro.org/scheduler/job/1554181#L10557 - Naresh > > Something like the attached (UNTESTED!) patch. > > Linus
