Buildresult: powerpc-fixes/mips-defconfig/mips-gcc4.6 built on Mar 20 2020, 14:44

kisskb

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Status:	OK
Date/Time:	Mar 20 2020, 14:44
Duration:	0:01:48.578836
Builder:	blade46
Revision:	KVM: PPC: Fix kernel crash with PR KVM (`1d0c32ec3b860a32df593a22bad0d1dbc5546a59)`
Target:	powerpc-fixes/mips-defconfig/mips-gcc4.6
Branch:	powerpc-fixes
Compiler:	mips-gcc4.6 (mips-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	defconfig (download)
Log:	Download original Possible warnings (12) warning: The last gc run reported the following. Please correct the root cause warning: There are too many unreachable loose objects; run 'git prune' to remove them. kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:72:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] fs/ext4/extents.c:5009:23: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:1859:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:2598:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] net/bridge/br_netlink.c:571:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized] net/core/devlink.c:4619:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized] fs/io_uring.c:5824:13: warning: 'err' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 1d0c32ec3b860a32df593a22bad0d1dbc5546a59^{commit} # git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git fixes-test warning: The last gc run reported the following. Please correct the root cause and remove .git/gc.log. Automatic cleanup will not be performed until the file is removed. warning: There are too many unreachable loose objects; run 'git prune' to remove them. # git rev-parse -q --verify 1d0c32ec3b860a32df593a22bad0d1dbc5546a59^{commit} 1d0c32ec3b860a32df593a22bad0d1dbc5546a59 # git checkout -q -f -B kisskb 1d0c32ec3b860a32df593a22bad0d1dbc5546a59 # git clean -qxdf # < git log -1 # commit 1d0c32ec3b860a32df593a22bad0d1dbc5546a59 # Author: Greg Kurz <groug@kaod.org> # Date: Wed Mar 18 18:43:30 2020 +0100 # # KVM: PPC: Fix kernel crash with PR KVM # # With PR KVM, shutting down a VM causes the host kernel to crash: # # [ 314.219284] BUG: Unable to handle kernel data access on read at 0xc00800000176c638 # [ 314.219299] Faulting instruction address: 0xc008000000d4ddb0 # cpu 0x0: Vector: 300 (Data Access) at [c00000036da077a0] # pc: c008000000d4ddb0: kvmppc_mmu_pte_flush_all+0x68/0xd0 [kvm_pr] # lr: c008000000d4dd94: kvmppc_mmu_pte_flush_all+0x4c/0xd0 [kvm_pr] # sp: c00000036da07a30 # msr: 900000010280b033 # dar: c00800000176c638 # dsisr: 40000000 # current = 0xc00000036d4c0000 # paca = 0xc000000001a00000 irqmask: 0x03 irq_happened: 0x01 # pid = 1992, comm = qemu-system-ppc # Linux version 5.6.0-master-gku+ (greg@palmb) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) #17 SMP Wed Mar 18 13:49:29 CET 2020 # enter ? for help # [c00000036da07ab0] c008000000d4fbe0 kvmppc_mmu_destroy_pr+0x28/0x60 [kvm_pr] # [c00000036da07ae0] c0080000009eab8c kvmppc_mmu_destroy+0x34/0x50 [kvm] # [c00000036da07b00] c0080000009e50c0 kvm_arch_vcpu_destroy+0x108/0x140 [kvm] # [c00000036da07b30] c0080000009d1b50 kvm_vcpu_destroy+0x28/0x80 [kvm] # [c00000036da07b60] c0080000009e4434 kvm_arch_destroy_vm+0xbc/0x190 [kvm] # [c00000036da07ba0] c0080000009d9c2c kvm_put_kvm+0x1d4/0x3f0 [kvm] # [c00000036da07c00] c0080000009da760 kvm_vm_release+0x38/0x60 [kvm] # [c00000036da07c30] c000000000420be0 __fput+0xe0/0x310 # [c00000036da07c90] c0000000001747a0 task_work_run+0x150/0x1c0 # [c00000036da07cf0] c00000000014896c do_exit+0x44c/0xd00 # [c00000036da07dc0] c0000000001492f4 do_group_exit+0x64/0xd0 # [c00000036da07e00] c000000000149384 sys_exit_group+0x24/0x30 # [c00000036da07e20] c00000000000b9d0 system_call+0x5c/0x68 # # This is caused by a use-after-free in kvmppc_mmu_pte_flush_all() # which dereferences vcpu->arch.book3s which was previously freed by # kvmppc_core_vcpu_free_pr(). This happens because kvmppc_mmu_destroy() # is called after kvmppc_core_vcpu_free() since commit ff030fdf5573 # ("KVM: PPC: Move kvm_vcpu_init() invocation to common code"). # # The kvmppc_mmu_destroy() helper calls one of the following depending # on the KVM backend: # # - kvmppc_mmu_destroy_hv() which does nothing (Book3s HV) # # - kvmppc_mmu_destroy_pr() which undoes the effects of # kvmppc_mmu_init() (Book3s PR 32-bit) # # - kvmppc_mmu_destroy_pr() which undoes the effects of # kvmppc_mmu_init() (Book3s PR 64-bit) # # - kvmppc_mmu_destroy_e500() which does nothing (BookE e500/e500mc) # # It turns out that this is only relevant to PR KVM actually. And both # 32 and 64 backends need vcpu->arch.book3s to be valid when calling # kvmppc_mmu_destroy_pr(). So instead of calling kvmppc_mmu_destroy() # from kvm_arch_vcpu_destroy(), call kvmppc_mmu_destroy_pr() at the # beginning of kvmppc_core_vcpu_free_pr(). This is consistent with # kvmppc_mmu_init() being the last call in kvmppc_core_vcpu_create_pr(). # # For the same reason, if kvmppc_core_vcpu_create_pr() returns an # error then this means that kvmppc_mmu_init() was either not called # or failed, in which case kvmppc_mmu_destroy() should not be called. # Drop the line in the error path of kvm_arch_vcpu_create(). # # Fixes: ff030fdf5573 ("KVM: PPC: Move kvm_vcpu_init() invocation to common code") # Signed-off-by: Greg Kurz <groug@kaod.org> # Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Link: https://lore.kernel.org/r/158455341029.178873.15248663726399374882.stgit@bahia.lan # < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-ld --version # < git log --format=%s --max-count=1 1d0c32ec3b860a32df593a22bad0d1dbc5546a59 # < make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mips-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- defconfig # < make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mips-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- help # make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mips-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- olddefconfig # make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mips-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- /kisskb/src/arch/mips/vdso/Makefile:66: MIPS VDSO requires binutils >= 2.25 /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:72:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here /kisskb/src/fs/ext4/extents.c: In function 'ext4_convert_unwritten_io_end_vec': /kisskb/src/fs/ext4/extents.c:5009:23: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write': /kisskb/src/drivers/base/regmap/regmap.c:1859:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2598:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here /kisskb/src/net/bridge/br_netlink.c: In function 'br_process_vlan_info': /kisskb/src/net/bridge/br_netlink.c:571:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/core/devlink.c: In function 'devlink_fmsg_prepare_skb': /kisskb/src/net/core/devlink.c:4619:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/io_uring.c: In function '__io_sqe_files_update': /kisskb/src/fs/io_uring.c:5824:13: warning: 'err' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/arch/mips/vdso/Makefile:66: MIPS VDSO requires binutils >= 2.25 /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] FIT description: Linux 5.6.0-rc2-g1d0c32ec3b86 Created: Fri Mar 20 14:46:21 2020 Image 0 (kernel@0) Description: Linux 5.6.0-rc2-g1d0c32ec3b86 Created: Fri Mar 20 14:46:21 2020 Type: Kernel Image Compression: gzip compressed Data Size: 4450355 Bytes = 4346.05 KiB = 4.24 MiB Architecture: MIPS OS: Linux Load Address: 0x80100000 Entry Point: 0x808b02f0 Hash algo: sha1 Hash value: d826cf6188070d1f9e807ae25abd7b2f6281a8e7 Image 1 (fdt@boston) Description: img,boston Device Tree Created: Fri Mar 20 14:46:21 2020 Type: Flat Device Tree Compression: uncompressed Data Size: 3793 Bytes = 3.70 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 4799f50d688573234da6e9d7701234d394759ef4 Image 2 (fdt@ni169445) Description: NI 169445 device tree Created: Fri Mar 20 14:46:21 2020 Type: Flat Device Tree Compression: uncompressed Data Size: 1871 Bytes = 1.83 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 51b89b31605ee62038c8468c429af091dfc75ec7 Image 3 (fdt@ocelot_pcb123) Description: MSCC Ocelot PCB123 Device Tree Created: Fri Mar 20 14:46:21 2020 Type: Flat Device Tree Compression: uncompressed Data Size: 4639 Bytes = 4.53 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 018897896b42c41c943aca35a20e4300dba250c8 Image 4 (fdt@ocelot_pcb120) Description: MSCC Ocelot PCB120 Device Tree Created: Fri Mar 20 14:46:21 2020 Type: Flat Device Tree Compression: uncompressed Data Size: 5198 Bytes = 5.08 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 36c7bd0bd79cfc2f7dd6acda6c7996294f4967e6 Image 5 (fdt@xilfpga) Description: MIPSfpga (xilfpga) Device Tree Created: Fri Mar 20 14:46:21 2020 Type: Flat Device Tree Compression: uncompressed Data Size: 2708 Bytes = 2.64 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 63d058b780f65e22da30f0a183433765f1807f1d Default Configuration: 'conf@default' Configuration 0 (conf@default) Description: Generic Linux kernel Kernel: kernel@0 Configuration 1 (conf@boston) Description: Boston Linux kernel Kernel: kernel@0 FDT: fdt@boston Configuration 2 (conf@ni169445) Description: NI 169445 Linux Kernel Kernel: kernel@0 FDT: fdt@ni169445 Configuration 3 (conf@ocelot_pcb123) Description: Ocelot Linux kernel Kernel: kernel@0 FDT: fdt@ocelot_pcb123 Configuration 4 (conf@ocelot_pcb120) Description: Ocelot Linux kernel Kernel: kernel@0 FDT: fdt@ocelot_pcb120 Configuration 5 (conf@xilfpga) Description: MIPSfpga Linux kernel Kernel: kernel@0 FDT: fdt@xilfpga Completed OK # rm -rf /kisskb/build/powerpc-fixes_mips-defconfig_mips-gcc4.6 # Build took: 0:01:48.578836

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