Joseph,
The first run of your latest kernel completed; however, I noticed the
following in the dmesg output:
[ 426.281083]
==================================================================
[ 426.286615] BUG: KASAN: use-after-free in find_first_bit+0x1f/0x80
[ 426.291841] Read of size 8 at addr ffff883ff7c1e780 by task cpuhp/31/195
[ 426.302209] CPU: 31 PID: 195 Comm: cpuhp/31 Not tainted 4.13.0-25-generic
#29~lp1733662KASANenabled
[ 426.302213] Hardware name: Cisco Systems Inc UCSC-C240-M4L/UCSC-C240-M4L,
BIOS C240M4.2.0.10c.0.032320160820 03/23/2016
[ 426.302215] Call Trace:
[ 426.302233] dump_stack+0xb8/0x12d
[ 426.302241] ? dma_virt_map_sg+0xd3/0xd3
[ 426.302252] ? show_regs_print_info+0x41/0x41
[ 426.302263] print_address_description+0x6f/0x280
[ 426.302269] kasan_report+0x27a/0x370
[ 426.302276] ? find_first_bit+0x1f/0x80
[ 426.302288] __asan_load8+0x54/0x90
[ 426.302295] find_first_bit+0x1f/0x80
[ 426.302306] has_busy_rmid+0x47/0x70
[ 426.302314] intel_rdt_offline_cpu+0x4b4/0x510
[ 426.302321] ? clear_closid_rmid.isra.4+0x70/0x70
[ 426.302333] ? sysfs_remove_group+0x7a/0xc0
[ 426.302339] ? clear_closid_rmid.isra.4+0x70/0x70
[ 426.302351] cpuhp_invoke_callback+0x15f/0x7e0
[ 426.302360] ? cpuhp_kick_ap_work+0x2d0/0x2d0
[ 426.302372] ? __schedule+0x4f1/0xeb0
[ 426.302377] ? cpuhp_kick_ap_work+0x2d0/0x2d0
[ 426.302385] ? firmware_map_remove+0x1b1/0x1b1
[ 426.302395] ? migrate_swap_stop+0x2f0/0x2f0
[ 426.302402] ? firmware_map_remove+0x1b1/0x1b1
[ 426.302407] ? migrate_swap_stop+0x2f0/0x2f0
[ 426.302414] ? schedule+0xd8/0x2a0
[ 426.302421] ? __schedule+0xeb0/0xeb0
[ 426.302427] ? default_wake_function+0x2f/0x40
[ 426.302439] ? __wake_up_common+0xa1/0xc0
[ 426.302446] cpuhp_down_callbacks+0x52/0xa0
[ 426.302453] cpuhp_thread_fun+0x117/0x1a0
[ 426.302459] ? cpu_up+0x20/0x20
[ 426.302468] smpboot_thread_fn+0x20e/0x2f0
[ 426.302474] ? sort_range+0x30/0x30
[ 426.302482] kthread+0x1b7/0x1e0
[ 426.302488] ? sort_range+0x30/0x30
[ 426.302493] ? kthread_create_on_node+0xc0/0xc0
[ 426.302500] ret_from_fork+0x1f/0x30
[ 426.307683] Allocated by task 56:
[ 426.312817] save_stack_trace+0x1b/0x20
[ 426.312824] save_stack+0x43/0xd0
[ 426.312829] kasan_kmalloc+0xad/0xe0
[ 426.312834] __kmalloc+0x105/0x230
[ 426.312840] intel_rdt_online_cpu+0x5a8/0x830
[ 426.312846] cpuhp_invoke_callback+0x15f/0x7e0
[ 426.312850] cpuhp_thread_fun+0x8b/0x1a0
[ 426.312856] smpboot_thread_fn+0x20e/0x2f0
[ 426.312861] kthread+0x1b7/0x1e0
[ 426.312866] ret_from_fork+0x1f/0x30
[ 426.317887] Freed by task 195:
[ 426.322879] save_stack_trace+0x1b/0x20
[ 426.322887] save_stack+0x43/0xd0
[ 426.322891] kasan_slab_free+0x72/0xc0
[ 426.322896] kfree+0x94/0x1a0
[ 426.322902] intel_rdt_offline_cpu+0x17d/0x510
[ 426.322908] cpuhp_invoke_callback+0x15f/0x7e0
[ 426.322912] cpuhp_down_callbacks+0x52/0xa0
[ 426.322917] cpuhp_thread_fun+0x117/0x1a0
[ 426.322925] smpboot_thread_fn+0x20e/0x2f0
[ 426.322929] kthread+0x1b7/0x1e0
[ 426.322935] ret_from_fork+0x1f/0x30
[ 426.327837] The buggy address belongs to the object at ffff883ff7c1e780
which belongs to the cache kmalloc-8 of size 8
[ 426.338289] The buggy address is located 0 bytes inside of
8-byte region [ffff883ff7c1e780, ffff883ff7c1e788)
[ 426.348805] The buggy address belongs to the page:
[ 426.354223] page:ffffea00ffdf0780 count:1 mapcount:0 mapping:
(null) index:0x0
[ 426.359838] flags: 0x57ffffc0000100(slab)
[ 426.365373] raw: 0057ffffc0000100 0000000000000000 0000000000000000
0000000100aa00aa
[ 426.371135] raw: dead000000000100 dead000000000200 ffff8817f500fb80
0000000000000000
[ 426.377004] page dumped because: kasan: bad access detected
[ 426.388626] Memory state around the buggy address:
[ 426.394498] ffff883ff7c1e680: fc fc 00 fc fc fb fc fc 00 fc fc fb fc fc 00
fc
[ 426.400634] ffff883ff7c1e700: fc 00 fc fc fb fc fc 00 fc fc fb fc fc fb fc
fc
[ 426.406721] >ffff883ff7c1e780: fb fc fc fb fc fc fb fc fc 00 fc fc fb fc fc
fb
[ 426.412737] ^
[ 426.418698] ffff883ff7c1e800: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb
fc
[ 426.424961] ffff883ff7c1e880: fc 00 fc fc fb fc fc fb fc fc fb fc fc fb fc
fc
[ 426.431154]
==================================================================
[ 426.437413] Disabling lock debugging due to kernel taint
[ 426.472795] IRQ 8: no longer affine to CPU31
[ 426.472806] IRQ 9: no longer affine to CPU31
[ 426.472827] IRQ 40: no longer affine to CPU31
[ 426.473962] smpboot: CPU 31 is now offline
I ran it several more times without any obvious errors; however, I might
have missed something. (The dmesg output is quite verbose and scrolls by
quickly!)
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https://bugs.launchpad.net/bugs/1733662
Title:
System hang with Linux kernel due to mainline commit 24247aeeabe
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