Messages in this thread | | | From | "Jason A. Donenfeld" <> | Date | Thu, 13 Jun 2019 18:34:22 +0200 | Subject | Re: infinite loop in read_hpet from ktime_get_boot_fast_ns |
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On Thu, Jun 13, 2019 at 6:26 PM Thomas Gleixner <tglx@linutronix.de> wrote: > That does not make sense. The coarse time getters use > tk->tkr_mono.base. base is updated every tick (or if the machine is > completely idle right when the first CPU wakes up again).
Sense or not, it seems to be happening, at least on 5.2-rc4:
int __init mod_init(void) { for (;;) { pr_err("%llu %llu %llu\n", get_jiffies_64(), ktime_get_coarse_boottime(), local_clock()); msleep(200); } return 0; }
[ 0.308166] wireguard: 4294892358 270211253 308165785 [ 0.512931] wireguard: 4294892410 270211253 512926052 [ 0.720930] wireguard: 4294892462 270211253 720925707 [ 0.928995] wireguard: 4294892514 270211253 928990019 [ 1.137011] wireguard: 4294892566 270211253 1137005585 [ 1.344948] wireguard: 4294892618 1270211253 1344943311 [ 1.552942] wireguard: 4294892670 1270211253 1552937363 [ 1.760963] wireguard: 4294892722 1270211253 1760957241 [ 1.969092] wireguard: 4294892774 1270211253 1969087174 [ 2.176951] wireguard: 4294892826 1270211253 2176946130 [ 2.385073] wireguard: 4294892878 2270211253 2385068075 [ 2.593033] wireguard: 4294892930 2270211253 2593025847 [ 2.801071] wireguard: 4294892982 2270211253 2801066369 [ 3.008895] wireguard: 4294893034 2270211253 3008892169 [ 3.216956] wireguard: 4294893086 2270211253 3216951160 [ 3.424965] wireguard: 4294893138 3270211253 3424960158 [ 3.632942] wireguard: 4294893190 3270211253 3632937133 [ 3.840947] wireguard: 4294893242 3270211253 3840942470 [ 4.048950] wireguard: 4294893294 3270211253 4048945319 [ 4.257078] wireguard: 4294893346 3270211253 4257072850 [ 4.464943] wireguard: 4294893398 4270211253 4464938724 [ 4.672934] wireguard: 4294893450 4270211253 4672929572 [ 4.880939] wireguard: 4294893502 4270211253 4880933901 [ 5.089015] wireguard: 4294893554 4270211253 5089010190 [ 5.297072] wireguard: 4294893606 4270211253 5297067556 [ 5.504935] wireguard: 4294893658 5270211253 5504929920 [ 5.712963] wireguard: 4294893710 5270211253 5712957452 [ 5.920949] wireguard: 4294893762 5270211253 5920944292 [ 6.128959] wireguard: 4294893814 5270211253 6128954684 [ 6.336968] wireguard: 4294893866 6270211253 6336962979 [ 6.544945] wireguard: 4294893918 6270211253 6544931514 [ 6.752963] wireguard: 4294893970 6270211253 6752958001 [ 6.961008] wireguard: 4294894022 6270211253 6961003309 [ 7.169073] wireguard: 4294894074 6270211253 7169068202 [ 7.376936] wireguard: 4294894126 7270211253 7376931429 [ 7.585022] wireguard: 4294894178 7270211253 7585016996 [ 7.793004] wireguard: 4294894230 7270211253 7792999324 [ 8.000953] wireguard: 4294894282 7270211253 8000947668 [ 8.208949] wireguard: 4294894334 7270211253 8208943630 [ 8.417090] wireguard: 4294894386 8270211253 8417085802 [ 8.625071] wireguard: 4294894438 8270211253 8625066012 [ 8.833086] wireguard: 4294894490 8270211253 8833081441 [ 9.041032] wireguard: 4294894542 8270211253 9041027362 [ 9.248948] wireguard: 4294894594 8270211253 9248943016 [ 9.456968] wireguard: 4294894646 9270211253 9456963019 [ 9.664955] wireguard: 4294894698 9270211253 9664950178 [ 9.872935] wireguard: 4294894750 9270211253 9872929704
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