From b951b8f721cd3c91c3a0c4faf79c8ff1756bf190 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Date: Mon, 6 May 2019 09:48:34 +0000 Subject: [PATCH] geom: fix initialization order There's a race between the initialization of devsoftc.mtx (by devinit) and the creation of the geom worker thread g_run_events, which calls devctl_queue_data_f. Both of those are initialized at SI_SUB_DRIVERS and SI_ORDER_FIRST, which means the geom worked thread can be created before the mutex has been initialized, leading to the panic below: wpanic: mtx_lock() of spin mutex (null) @ /usr/home/osstest/build.135317.build-amd64-freebsd/freebsd/sys/kern/subr_bus.c:620 cpuid = 3 time = 1 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe003b968710 vpanic() at vpanic+0x19d/frame 0xfffffe003b968760 panic() at panic+0x43/frame 0xfffffe003b9687c0 __mtx_lock_flags() at __mtx_lock_flags+0x145/frame 0xfffffe003b968810 devctl_queue_data_f() at devctl_queue_data_f+0x6a/frame 0xfffffe003b968840 g_dev_taste() at g_dev_taste+0x463/frame 0xfffffe003b968a00 g_load_class() at g_load_class+0x1bc/frame 0xfffffe003b968a30 g_run_events() at g_run_events+0x197/frame 0xfffffe003b968a70 fork_exit() at fork_exit+0x84/frame 0xfffffe003b968ab0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe003b968ab0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- KDB: enter: panic [ thread pid 13 tid 100029 ] Stopped at kdb_enter+0x3b: movq $0,kdb_why Fix this by initializing geom at SI_ORDER_SECOND instead of SI_ORDER_FIRST. Sponsored by: Citrix Systems R&D Reviewed by: kevans, markj Differential revision: https://reviews.freebsd.org/D20148 --- sys/geom/geom.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/geom/geom.h b/sys/geom/geom.h index d7744b01daf4..e4f0ed095eaf 100644 --- a/sys/geom/geom.h +++ b/sys/geom/geom.h @@ -415,7 +415,7 @@ g_free(void *ptr) static moduledata_t name##_mod = { \ #name, g_modevent, &class \ }; \ - DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); + DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND); int g_is_geom_thread(struct thread *td);