Buildresult: powerpc-next/x86_64-defconfig/x86_64-gcc4.6 built on Mar 31 2018, 01:43

kisskb

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Status:	OK
Date/Time:	Mar 31 2018, 01:43
Duration:	0:01:21.136991
Builder:	ka1
Revision:	powerpc/eeh: Fix race with driver un/bind (`ed16e99272308afe183d983523bf995e8a517026)`
Target:	powerpc-next/x86_64-defconfig/x86_64-gcc4.6
Branch:	powerpc-next
Compiler:	x86_64-gcc4.6 (x86_64-linux-gcc (GCC) 4.6.3)
Config:	defconfig (download)
Log:	Download original Possible warnings (13) arch/x86/kernel/e820.c:652:2: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized] sound/hda/hdac_regmap.c:282:16: warning: 'err' may be used uninitialized in this function [-Wuninitialized] arch/x86/kernel/apic/io_apic.c:1033:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized] kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] kernel/rcu/tree.o: warning: objtool: rcu_init()+0x1c5: unreachable instruction kernel/trace/trace.o: warning: objtool: tracing_start()+0x6f: unreachable instruction fs/aio.o: warning: objtool: aio_nr_sub()+0x2d: unreachable instruction mm/hugetlb.c:1439:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] drivers/clk/clk.o: warning: objtool: clk_prepare_unlock()+0x44: unreachable instruction drivers/dma-buf/reservation.c:207:2: warning: 'k' may be used uninitialized in this function [-Wuninitialized] net/mac80211/mlme.c:1350:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify ed16e99272308afe183d983523bf995e8a517026^{commit} ed16e99272308afe183d983523bf995e8a517026 already have revision, skipping fetch # git checkout -q -f -B kisskb ed16e99272308afe183d983523bf995e8a517026 # git clean -qxdf # < git log -1 # commit ed16e99272308afe183d983523bf995e8a517026 # Author: Michael Neuling <mikey@neuling.org> # Date: Mon Mar 26 15:17:07 2018 +1100 # # powerpc/eeh: Fix race with driver un/bind # # The current EEH callbacks can race with a driver unbind. This can # result in a backtraces like this: # # EEH: Frozen PHB#0-PE#1fc detected # EEH: PE location: S000009, PHB location: N/A # CPU: 2 PID: 2312 Comm: kworker/u258:3 Not tainted 4.15.6-openpower1 #2 # Workqueue: nvme-wq nvme_reset_work [nvme] # Call Trace: # dump_stack+0x9c/0xd0 (unreliable) # eeh_dev_check_failure+0x420/0x470 # eeh_check_failure+0xa0/0xa4 # nvme_reset_work+0x138/0x1414 [nvme] # process_one_work+0x1ec/0x328 # worker_thread+0x2e4/0x3a8 # kthread+0x14c/0x154 # ret_from_kernel_thread+0x5c/0xc8 # nvme nvme1: Removing after probe failure status: -19 # <snip> # cpu 0x23: Vector: 300 (Data Access) at [c000000ff50f3800] # pc: c0080000089a0eb0: nvme_error_detected+0x4c/0x90 [nvme] # lr: c000000000026564: eeh_report_error+0xe0/0x110 # sp: c000000ff50f3a80 # msr: 9000000000009033 # dar: 400 # dsisr: 40000000 # current = 0xc000000ff507c000 # paca = 0xc00000000fdc9d80 softe: 0 irq_happened: 0x01 # pid = 782, comm = eehd # Linux version 4.15.6-openpower1 (smc@smc-desktop) (gcc version 6.4.0 (Buildroot 2017.11.2-00008-g4b6188e)) #2 SM P Tue Feb 27 12:33:27 PST 2018 # enter ? for help # eeh_report_error+0xe0/0x110 # eeh_pe_dev_traverse+0xc0/0xdc # eeh_handle_normal_event+0x184/0x4c4 # eeh_handle_event+0x30/0x288 # eeh_event_handler+0x124/0x170 # kthread+0x14c/0x154 # ret_from_kernel_thread+0x5c/0xc8 # # The first part is an EEH (on boot), the second half is the resulting # crash. nvme probe starts the nvme_reset_work() worker thread. This # worker thread starts touching the device which see a device error # (EEH) and hence queues up an event in the powerpc EEH worker # thread. nvme_reset_work() then continues and runs # nvme_remove_dead_ctrl_work() which results in unbinding the driver # from the device and hence releases all resources. At the same time, # the EEH worker thread starts doing the EEH .error_detected() driver # callback, which no longer works since the resources have been freed. # # This fixes the problem in the same way the generic PCIe AER code (in # drivers/pci/pcie/aer/aerdrv_core.c) does. It makes the EEH code hold # the device_lock() while performing the driver EEH callbacks and # associated code. This ensures either the callbacks are no longer # register, or if they are registered the driver will not be removed # from underneath us. # # This has been broken forever. The EEH call backs were first introduced # in 2005 (in 77bd7415610) but it's not clear if a lock was needed back # then. # # Fixes: 77bd74156101 ("[PATCH] powerpc: PCI Error Recovery: PPC64 core recovery routines") # Cc: stable@vger.kernel.org # v2.6.16+ # Signed-off-by: Michael Neuling <mikey@neuling.org> # Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version # < git log --format=%s --max-count=1 ed16e99272308afe183d983523bf995e8a517026 # < make -s -j 48 ARCH=x86 O=/kisskb/build/powerpc-next_x86_64_defconfig_x86_64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- x86_64_defconfig # make -s -j 48 ARCH=x86 O=/kisskb/build/powerpc-next_x86_64_defconfig_x86_64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux- /kisskb/src/arch/x86/kernel/e820.c: In function 'e820__setup_pci_gap': /kisskb/src/arch/x86/kernel/e820.c:652:2: warning: 'gapstart' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/sound/hda/hdac_regmap.c: In function 'hda_reg_write': /kisskb/src/sound/hda/hdac_regmap.c:282:16: warning: 'err' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/arch/x86/kernel/apic/io_apic.c: In function 'mp_map_pin_to_irq': /kisskb/src/arch/x86/kernel/apic/io_apic.c:1033:6: warning: 'irq' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/mm/vmstat.c: In function 'sysctl_vm_numa_stat_handler': /kisskb/src/mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount': /kisskb/src/kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] kernel/rcu/tree.o: warning: objtool: rcu_init()+0x1c5: unreachable instruction kernel/trace/trace.o: warning: objtool: tracing_start()+0x6f: unreachable instruction fs/aio.o: warning: objtool: aio_nr_sub()+0x2d: unreachable instruction /kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page': /kisskb/src/mm/hugetlb.c:1439:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] drivers/clk/clk.o: warning: objtool: clk_prepare_unlock()+0x44: unreachable instruction /kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence': /kisskb/src/drivers/dma-buf/reservation.c:207:2: warning: 'k' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/dma-buf/reservation.c:160:17: note: 'k' was declared here /kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon': /kisskb/src/net/mac80211/mlme.c:1350:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/mac80211/mlme.c:1307:6: note: 'pwr_level_cisco' was declared here Completed OK # rm -rf /kisskb/build/powerpc-next_x86_64_defconfig_x86_64 # Build took: 0:01:21.136991

© Michael Ellerman 2006-2018.