On Sat, Dec 01, 2012 at 01:34:04AM -0800, sig6247 wrote: > On Fri, 30 Nov 2012 18:47:15 +0200, Konstantin Belousov <kostikbel_at_gmail.com> wrote: > > > Hm, this is not very useful. Although the panic is again caused by the stack > > overflow, most likely (please also include the output of the "show thread" > > from ddb), it is at different place, and probably at the leaf function. > > > > Can you try some more times, so that we could see 'big' backtrace ? > > Sure. Thanks. > > WARNING: WITNESS option enabled, expect reduced performance. > Trying to mount root from zfs:zroot []... > > Fatal double fault: > eip = 0xc0add15d > esp = 0xc86bffc8 > ebp = 0xc86c003c > cpuid = 1; apic id = 01 > panic: double fault > cpuid = 1 > KDB: enter: panic > [ thread pid 1 tid 100002 ] > Stopped at kdb_enter+0x3d: movl $0,kdb_why > db> bt > Tracing pid 1 tid 100002 td 0xc89efbc0 > kdb_enter(c1065960,c1065960,c10b903b,c139f438,2243cdbd,...) at kdb_enter+0x3d/frame 0xc139f3f0 > panic(c10b903b,1,1,1,c86c003c,...) at panic+0x14b/frame 0xc139f42c > dblfault_handler() at dblfault_handler+0xab/frame 0xc139f42c > --- trap 0x17, eip = 0xc0add15d, esp = 0xc86bffc8, ebp = 0xc86c003c --- > witness_checkorder(c1fd7508,9,c109ee8c,7fa,0,...) at witness_checkorder+0x37d/frame 0xc86c003c > __mtx_lock_flags(c1fd7518,0,c109ee8c,7fa,c135e998,...) at __mtx_lock_flags+0x87/frame 0xc86c007 > 0 > uma_zalloc_arg(c1fd66c0,0,1,4d3,c86c0110,...) at uma_zalloc_arg+0x605/frame 0xc86c00c8 > vm_map_insert(c1fd508c,c13e0ca0,bd3a000,0,cbc39000,...) at vm_map_insert+0x499/frame 0xc86c0130 > > kmem_back(c1fd508c,cbc39000,1000,3,c86c01d4,...) at kmem_back+0x76/frame 0xc86c018c > kmem_malloc(c1fd508c,1000,3) at kmem_malloc+0x250/frame 0xc86c01c0 > page_alloc(c1fd1d80,1000,c86c020b,3,c1fd1d80,...) at page_alloc+0x27/frame 0xc86c01d4 > keg_alloc_slab(103,4,c109ee8c,870,cbb95f6c,...) at keg_alloc_slab+0xc3/frame 0xc86c0218 > keg_fetch_slab(103,c1fd1d80,cbb95f6c,c1fc8230,c86c02c0,...) at keg_fetch_slab+0xe2/frame 0xc86c > 0250 > zone_fetch_slab(c1fd1d80,c1fd0480,103,826,0,...) at zone_fetch_slab+0x43/frame 0xc86c0268 > uma_zalloc_arg(c1fd1d80,0,102,3,2,...) at uma_zalloc_arg+0x3f2/frame 0xc86c02c0 > malloc(4c,c1826100,102,c86c0388,c173909a,...) at malloc+0xe9/frame 0xc86c02e8 > zfs_kmem_alloc(4c,102,cb7d8820,c89efbc0,cb7d8820,...) at zfs_kmem_alloc+0x20/frame 0xc86c02fc > vdev_mirror_io_start(cba232e0,10,cba232e0,1,0,...) at vdev_mirror_io_start+0x14a/frame 0xc86c03 > 88 > zio_vdev_io_start(cba232e0,c89efbc0,0,cba232e0,c86c0600,...) at zio_vdev_io_start+0x228/frame 0 > xc86c03e4 > zio_execute(cba232e0,cb7d8000,cbbec640,cbbe2000,600,...) at zio_execute+0x106/frame 0xc86c0418 > spa_load_verify_cb(cb7d8000,0,cbbec640,cba6bd20,c86c0600,...) at spa_load_verify_cb+0x89/frame > 0xc86c0458 > traverse_visitbp(cba6bd20,cbbec640,c86c0600,c86c0ba0,0,...) at traverse_visitbp+0x29f/frame 0xc > 86c05e0 > traverse_dnode(cba6bd20,0,0,23,0,...) at traverse_dnode+0x92/frame 0xc86c0638 > traverse_visitbp(cba6bd98,cbbf0080,c86c0890,cba6bdd4,c16ca7e0,...) at traverse_visitbp+0xe47/fr > ame 0xc86c07c0 > traverse_visitbp(cba6bdd4,cbbe2840,c86c0968,c86c0ba0,0,...) at traverse_visitbp+0xf32/frame 0xc > 86c0948 > traverse_dnode(cba6bdd4,0,0,0,0,...) at traverse_dnode+0x92/frame 0xc86c09a0 > traverse_visitbp(0,cb7d8398,c86c0b50,2,cbbdc214,...) at traverse_visitbp+0x96d/frame 0xc86c0b28 > > traverse_impl(0,0,cb7d8398,74,0,...) at traverse_impl+0x268/frame 0xc86c0be0 > traverse_pool(cb7d8000,74,0,d,c1723830,...) at traverse_pool+0x79/frame 0xc86c0c88 > spa_load(0,1,c86c0ec4,1e,0,...) at spa_load+0x1dde/frame 0xc86c0df0 > spa_load(0,0,c13d9d14,1,3,...) at spa_load+0x11a5/frame 0xc86c0f58 > spa_load_best(0,ffffffff,ffffffff,1,c0add175,...) at spa_load_best+0x71/frame 0xc86c0fb0 > spa_open_common(c17dce4e,0,0,c86c1190,c16f1a1c,...) at spa_open_common+0x11a/frame 0xc86c100c > spa_open(c86c1078,c86c1074,c17dce4e,c135e998,c1fd7798,...) at spa_open+0x27/frame 0xc86c1020 > dsl_dir_open_spa(0,c89770b0,c17dd1e1,c86c11f8,c86c11f4,...) at dsl_dir_open_spa+0x6c/frame 0xc8 > 6c1190 > dsl_dataset_hold(c89770b0,cb7d3800,c86c1240,cb7d3800,cb7d3800,...) at dsl_dataset_hold+0x3a/fra > me 0xc86c120c > dsl_dataset_own(c89770b0,0,cb7d3800,c86c1240,c1824e30,...) at dsl_dataset_own+0x21/frame 0xc86c > 1228 > dmu_objset_own(c89770b0,2,1,cb7d3800,c86c1290,...) at dmu_objset_own+0x2a/frame 0xc86c1250 > zfsvfs_create(c89770b0,c86c13ac,c17ea09b,681,0,...) at zfsvfs_create+0x4c/frame 0xc86c12a8 > zfs_mount(cb99b540,c17f0160,cb98b100,c89cae80,0,...) at zfs_mount+0x42c/frame 0xc86c14e0 > vfs_donmount(c89efbc0,4000,0,c86c1790,cb98b180,...) at vfs_donmount+0xc6d/frame 0xc86c1778 > kernel_mount(c8977490,4000,0,0,1,...) at kernel_mount+0x6b/frame 0xc86c17b8 > parse_mount(cb96e0e0,c1195498,0,1,0,...) at parse_mount+0x606/frame 0xc86c19d8 > vfs_mountroot(c13da634,4,c105ceba,2bb,0,...) at vfs_mountroot+0x6cf/frame 0xc86c1c60 > start_init(0,c86c1d08,c105f7c4,3db,0,...) at start_init+0x6a/frame 0xc86c1ccc > fork_exit(c0a429e0,0,c86c1d08) at fork_exit+0x7f/frame 0xc86c1cf4 > fork_trampoline() at fork_trampoline+0x8/frame 0xc86c1cf4 > --- trap 0, eip = 0, esp = 0xc86c1d40, ebp = 0 --- > db> show thread > Thread 100002 at 0xc89efbc0: > proc (pid 1): 0xc89edb40 > name: kernel > stack: 0xc86c0000-0xc86c1fff > flags: 0x4 pflags: 0x10000 > state: RUNNING (CPU 1) > priority: 84 > container lock: sched lock 1 (0xc1220000) > db> Please try the patch below. It might give an immediate relief, but still there are many offenders in the backtrace. diff --git a/sys/kern/vfs_mountroot.c b/sys/kern/vfs_mountroot.c index 83948f2..147926e 100644 --- a/sys/kern/vfs_mountroot.c +++ b/sys/kern/vfs_mountroot.c _at__at_ -672,10 +672,11 _at__at_ parse_mount_dev_present(const char *dev) return (error != 0) ? 0 : 1; } +#define ERRMSGL 255 static int parse_mount(char **conf) { - char errmsg[255]; + char *errmsg; struct mntarg *ma; char *dev, *fs, *opts, *tok; int delay, error, timeout; _at__at_ -707,7 +708,7 _at__at_ parse_mount(char **conf) printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, (opts != NULL) ? opts : ""); - bzero(errmsg, sizeof(errmsg)); + errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); if (vfs_byname(fs) == NULL) { strlcpy(errmsg, "unknown file system", sizeof(errmsg)); _at__at_ -734,7 +735,7 _at__at_ parse_mount(char **conf) ma = mount_arg(ma, "fstype", fs, -1); ma = mount_arg(ma, "fspath", "/", -1); ma = mount_arg(ma, "from", dev, -1); - ma = mount_arg(ma, "errmsg", errmsg, sizeof(errmsg)); + ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); ma = mount_arg(ma, "ro", NULL, 0); ma = parse_mountroot_options(ma, opts); error = kernel_mount(ma, MNT_ROOTFS); _at__at_ -748,11 +749,13 _at__at_ parse_mount(char **conf) printf(".\n"); } free(fs, M_TEMP); + free(errmsg, M_TEMP); if (opts != NULL) free(opts, M_TEMP); /* kernel_mount can return -1 on error. */ return ((error < 0) ? EDOOFUS : error); } +#undef ERRMSGL static int vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs)
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