I am doing some work with Xen 4.7 on the cubietruck (ARM32). I've noticed some strange behavior after I create/destroy enough domains and put together a script to do the add/remove for me. For this particular test I am creating a small mini-os (Mirage) domain with 32MB of RAM, deleting it, creating the new one, and so on.
After running this for a while, I get the following error (with version 8478c9409a2c6726208e8dbc9f3e455b76725a33): (d846) Virtual -> physical offset = 3fc00000 (d846) Checking DTB at 023ff000... (d846) [32;1mMirageOS booting...[0m (d846) Initialising console ... done. (d846) gnttab_stubs.c: initialised mini-os gntmap (d846) allocate_ondemand(1, 1) returning 2300000 (d846) allocate_ondemand(1, 1) returning 2301000 (XEN) grant_table.c:3288:d0v1 Grant release (0) ref:(9) flags:(2) dom:(0) (XEN) grant_table.c:3288:d0v1 Grant release (1) ref:(11) flags:(2) dom:(0) (XEN) p2m.c: dom1101: VMID pool exhausted (XEN) CPU0: Unexpected Trap: Data Abort (XEN) ----[ Xen-4.7.0-rc arm32 debug=y Not tainted ]---- (XEN) CPU: 0 (XEN) PC: 0021fdd4 free_domheap_pages+0x1c/0x324 (XEN) CPSR: 6001011a MODE:Hypervisor (XEN) R0: 00000000 R1: 00000001 R2: 00000003 R3: 00304320 (XEN) R4: 41c57000 R5: 41c57188 R6: 00200200 R7: 00100100 (XEN) R8: 41c57180 R9: 43fdfe60 R10:00000000 R11:43fdfd5c R12:00000000 (XEN) HYP: SP: 43fdfd2c LR: 0025b0cc (XEN) (XEN) VTCR_EL2: 80003558 (XEN) VTTBR_EL2: 00010000bfb0e000 (XEN) (XEN) SCTLR_EL2: 30cd187f (XEN) HCR_EL2: 000000000038663f (XEN) TTBR0_EL2: 00000000bfafc000 (XEN) (XEN) ESR_EL2: 94000006 (XEN) HPFAR_EL2: 000000000001c810 (XEN) HDFAR: 00000014 (XEN) HIFAR: 84e37182 (XEN) (XEN) Xen stack trace from sp=43fdfd2c: (XEN) 002cf1b7 43fdfd64 41c57000 00000100 41c57000 41c57188 00200200 00100100 (XEN) 41c57180 43fdfe60 00000000 43fdfd7c 0025b0cc 41c57000 fffffff0 43fdfe60 (XEN) 0000001f 0000044d 43fdfe60 43fdfd8c 0024f668 41c57000 fffffff0 43fdfda4 (XEN) 0024f8f0 41c57000 00000000 00000000 0000001f 43fdfddc 0020854c 43fdfddc (XEN) 00000000 cccccccd 00304600 002822bc 00000000 b6f20004 0000044d 00304600 (XEN) 00304320 d767a000 00000000 43fdfeec 00206d6c 43fdfe6c 00218f8c 00000000 (XEN) 00000007 43fdfe30 43fdfe34 00000000 43fdfe20 00000002 43fdfe48 43fdfe78 (XEN) 00000000 00000000 00000000 00007622 00002b0e 40023000 00000000 43fdfec8 (XEN) 00000002 43fdfebc 00218f8c 00000001 0000000b 0000ffff b6eba880 0000000b (XEN) 5abab87d f34aab2c 6adc50b8 e1713cd0 00000000 00000000 00000000 00000000 (XEN) b6eba8d8 00000000 50043f00 b6eb5038 b6effba8 0000003e 00000000 000c3034 (XEN) 000b9cb8 000bda30 000bda30 00000000 b6eba56c 0000003e b6effba8 b6effdb0 (XEN) be9558d4 000000d0 be9558d4 00000071 b6effba8 b6effd6c b6ed6fb4 4a000ea1 (XEN) c01077f8 43fdff58 002067b8 00305000 be9557c8 d767a000 00000000 43fdff54 (XEN) 00260130 00000000 43fdfefc 43fdff1c 200f019a 400238f4 00000004 00000004 (XEN) 002c9f00 00000000 00304600 c094c240 00000000 00305000 be9557a0 d767a000 (XEN) 00000000 43fdff44 00000000 c094c240 00000000 00305000 be9557c8 d767a000 (XEN) 00000000 43fdff58 00263b10 b6f20004 00000000 00000000 00000000 00000000 (XEN) c094c240 00000000 00305000 be9557c8 d767a000 00000000 00000001 00000024 (XEN) ffffffff b691ab34 c01077f8 60010013 00000000 be9557c4 c0a38600 c010c400 (XEN) Xen call trace: (XEN) [<0021fdd4>] free_domheap_pages+0x1c/0x324 (PC) (XEN) [<0025b0cc>] p2m_teardown+0xa0/0x108 (LR) (XEN) [<0025b0cc>] p2m_teardown+0xa0/0x108 (XEN) [<0024f668>] arch_domain_destroy+0x20/0x50 (XEN) [<0024f8f0>] arch_domain_create+0x258/0x284 (XEN) [<0020854c>] domain_create+0x2dc/0x510 (XEN) [<00206d6c>] do_domctl+0x5b4/0x1928 (XEN) [<00260130>] do_trap_hypervisor+0x1170/0x15b0 (XEN) [<00263b10>] entry.o#return_from_trap+0/0x4 (XEN) (XEN) (XEN) **************************************** (XEN) Panic on CPU 0: (XEN) CPU0: Unexpected Trap: Data Abort (XEN) (XEN) **************************************** (XEN) (XEN) Reboot in five seconds... I'm not 100% sure, from the "VMID pool exhausted" message it would appear that the p2m_init() function failed to allocate a VM ID, which caused domain creation to fail, and the NULL pointer dereference when trying to clean up the not-fully-created domain. However, since I only have 1 domain active at a time, I'm not sure why I should run out of VM IDs. - Aaron Cornelius _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
