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SubjectRe: [4.7+] various memory corruption reports.
On Fri, Jul 29, 2016 at 08:56:08PM +0300, Andrey Ryabinin wrote:

> >> > I suspect this is false positives due to changes in KASAN.
> >> > Bisection probably will point to
> >> > 80a9201a5965f4715d5c09790862e0df84ce0614 ("mm, kasan: switch SLUB to
> >> > stackdepot, enable memory quarantine for SLUB)"
> >>
> >> good call. reverting that changeset seems to have solved it.
> > Could you please try with this?
> Actually, this is not quite right, it should be like this:


Seems to have stopped the corruption, but now I get NMi watchdog traces..


[ 109.158553] NMI watchdog: Watchdog detected hard LOCKUP on cpu 2irq event stamp: 1411258
[ 109.158797] hardirqs last enabled at (1411257): [<ffffffff98485c27>] get_page_from_freelist+0x897/0x1bb0
[ 109.159034] hardirqs last disabled at (1411258): [<ffffffff99a08e29>] _raw_spin_lock_irq+0x19/0x80
[ 109.159246] softirqs last enabled at (1411096): [<ffffffff99a0cdee>] __do_softirq+0x66e/0x9a7
[ 109.159457] softirqs last disabled at (1411089): [<ffffffff9813bd78>] irq_exit+0x118/0x140
[ 109.159646] CPU: 2 PID: 2998 Comm: trinity-c6 Not tainted 4.7.0-think+ #12
[ 109.159883] ffff880461380434 00000000f39ba2d9 ffff88046880bab8 ffffffff98a48532
[ 109.160050] 0000000000000000 0000000000000002 ffff88046880bad8 ffffffff98357fbb
[ 109.160218] ffff880461380008 ffff88046880bc00 ffff88046880bb20 ffffffff9842f7d1
[ 109.160385] Call Trace:
[ 109.160439] <NMI> [<ffffffff98a48532>] dump_stack+0x68/0x96
[ 109.160568] [<ffffffff98357fbb>] watchdog_overflow_callback+0x15b/0x190
[ 109.160721] [<ffffffff9842f7d1>] __perf_event_overflow+0x1b1/0x540
[ 109.172185] [<ffffffff98455b14>] perf_event_overflow+0x14/0x20
[ 109.183591] [<ffffffff9801976a>] intel_pmu_handle_irq+0x36a/0xad0
[ 109.194988] [<ffffffff98019400>] ? intel_pmu_save_and_restart+0xe0/0xe0
[ 109.206444] [<ffffffff980571e9>] ? nmi_handle+0x2b9/0x480
[ 109.218066] [<ffffffff9836eb79>] ? is_ftrace_trampoline+0xa9/0x100
[ 109.229782] [<ffffffff9800ba4c>] perf_event_nmi_handler+0x2c/0x50
[ 109.241370] [<ffffffff98057058>] nmi_handle+0x128/0x480
[ 109.252853] [<ffffffff98056f35>] ? nmi_handle+0x5/0x480
[ 109.264293] [<ffffffff9836eb79>] ? is_ftrace_trampoline+0xa9/0x100
[ 109.275713] [<ffffffff980576d2>] default_do_nmi+0xb2/0x210
[ 109.287158] [<ffffffff980579da>] do_nmi+0x1aa/0x220
[ 109.298562] [<ffffffff99a0bb07>] end_repeat_nmi+0x1a/0x1e
[ 109.309964] [<ffffffff9846ca45>] ? __add_to_page_cache_locked+0x335/0xaa0
[ 109.321366] [<ffffffff9836eb79>] ? is_ftrace_trampoline+0xa9/0x100
[ 109.332776] [<ffffffff9836eb79>] ? is_ftrace_trampoline+0xa9/0x100
[ 109.344091] [<ffffffff9836eb79>] ? is_ftrace_trampoline+0xa9/0x100
[ 109.355283] <<EOE>> [<ffffffff981871e6>] __kernel_text_address+0x86/0xb0
[ 109.366438] [<ffffffff98055c4b>] print_context_stack+0x7b/0x100
[ 109.377709] [<ffffffff98054e9b>] dump_trace+0x12b/0x350
[ 109.388863] [<ffffffff9857db12>] ? qlist_free_all+0x42/0x100
[ 109.399976] [<ffffffff98076ceb>] save_stack_trace+0x2b/0x50
[ 109.411082] [<ffffffff98573003>] set_track+0x83/0x140
[ 109.422152] [<ffffffff98575f4a>] free_debug_processing+0x1aa/0x420
[ 109.433268] [<ffffffff9857db12>] ? qlist_free_all+0x42/0x100
[ 109.444334] [<ffffffff9857db12>] ? qlist_free_all+0x42/0x100
[ 109.455345] [<ffffffff98578506>] __slab_free+0x1d6/0x2e0
[ 109.466262] [<ffffffff98aab907>] ? debug_smp_processor_id+0x17/0x20
[ 109.477239] [<ffffffff98226d2d>] ? get_lock_stats+0x1d/0x90
[ 109.487929] [<ffffffff9857db12>] ? qlist_free_all+0x42/0x100
[ 109.498521] [<ffffffff9857a9b6>] ___cache_free+0xb6/0xd0
[ 109.509125] [<ffffffff9857db53>] qlist_free_all+0x83/0x100
[ 109.519652] [<ffffffff9857df07>] quarantine_reduce+0x177/0x1b0
[ 109.530159] [<ffffffff9857c423>] kasan_kmalloc+0xf3/0x100
[ 109.540676] [<ffffffff98226bfd>] ? trace_hardirqs_off+0xd/0x10
[ 109.551159] [<ffffffff98a542d6>] ? radix_tree_node_alloc+0x96/0x190
[ 109.561658] [<ffffffff9857c922>] kasan_slab_alloc+0x12/0x20
[ 109.572120] [<ffffffff98577549>] kmem_cache_alloc+0x109/0x3e0
[ 109.582555] [<ffffffff9859ebf1>] ? get_mem_cgroup_from_mm+0x3c1/0x4c0
[ 109.593006] [<ffffffff98a542d6>] radix_tree_node_alloc+0x96/0x190
[ 109.603406] [<ffffffff98a56e1b>] __radix_tree_create+0x32b/0xa10
[ 109.613785] [<ffffffff9846ca10>] ? __add_to_page_cache_locked+0x300/0xaa0
[ 109.624148] [<ffffffff9846ca45>] __add_to_page_cache_locked+0x335/0xaa0
[ 109.634508] [<ffffffff9846c710>] ? filemap_map_pages+0xcc0/0xcc0
[ 109.644814] [<ffffffff98487b90>] ? gfp_pfmemalloc_allowed+0x130/0x130
[ 109.655110] [<ffffffff98aab907>] ? debug_smp_processor_id+0x17/0x20
[ 109.665296] [<ffffffff98226d2d>] ? get_lock_stats+0x1d/0x90
[ 109.675494] [<ffffffff988a5401>] ? jbd2_journal_stop+0x8f1/0x1390
[ 109.685622] [<ffffffff9846d2ad>] add_to_page_cache_lru+0xdd/0x2c0
[ 109.695761] [<ffffffff9846d1d0>] ? add_to_page_cache_locked+0x20/0x20
[ 109.705885] [<ffffffff9846b4e9>] ? find_get_entry+0x259/0x490
[ 109.715981] [<ffffffff9846b295>] ? find_get_entry+0x5/0x490
[ 109.726074] [<ffffffff9846d621>] pagecache_get_page+0x191/0x620
[ 109.736160] [<ffffffff9846db01>] grab_cache_page_write_begin+0x51/0x80
[ 109.746224] [<ffffffff982712c0>] ? rcu_read_lock_sched_held+0xf0/0x130
[ 109.756277] [<ffffffff98797722>] ext4_da_write_begin+0x1c2/0xaa0
[ 109.766287] [<ffffffff98797560>] ? ext4_write_begin+0xe90/0xe90
[ 109.776312] [<ffffffff98493318>] ? balance_dirty_pages_ratelimited+0x498/0x14c0
[ 109.786347] [<ffffffff984692c0>] generic_perform_write+0x290/0x520
[ 109.796322] [<ffffffff982712c0>] ? rcu_read_lock_sched_held+0xf0/0x130
[ 109.806352] [<ffffffff98469030>] ? generic_file_readonly_mmap+0x1b0/0x1b0
[ 109.816359] [<ffffffff9862da01>] ? __mnt_drop_write_file+0x31/0x40
[ 109.826345] [<ffffffff9861bf0a>] ? file_update_time+0x24a/0x3a0
[ 109.836261] [<ffffffff9861bcc0>] ? should_remove_suid+0xc0/0xc0
[ 109.846155] [<ffffffff98226d2d>] ? get_lock_stats+0x1d/0x90
[ 109.855976] [<ffffffff984710a4>] __generic_file_write_iter+0x314/0x530
[ 109.865741] [<ffffffff9876e044>] ext4_file_write_iter+0x1b4/0xf10
[ 109.875549] [<ffffffff98aab907>] ? debug_smp_processor_id+0x17/0x20
[ 109.885328] [<ffffffff98226d2d>] ? get_lock_stats+0x1d/0x90
[ 109.895081] [<ffffffff9876de90>] ? ext4_unwritten_wait+0x1e0/0x1e0
[ 109.904849] [<ffffffff98231cd0>] ? debug_check_no_locks_freed+0x280/0x280
[ 109.914646] [<ffffffff98502ca6>] ? __might_fault+0xf6/0x1b0
[ 109.924394] [<ffffffff98502d16>] ? __might_fault+0x166/0x1b0
[ 109.934012] [<ffffffff9857c0d4>] ? kasan_check_write+0x14/0x20
[ 109.943677] [<ffffffff985c9f3f>] do_iter_readv_writev+0x23f/0x510
[ 109.953248] [<ffffffff985c9d00>] ? vfs_iter_write+0x550/0x550
[ 109.962810] [<ffffffff98223ef7>] ? percpu_down_read+0x57/0xa0
[ 109.972324] [<ffffffff985d3224>] ? __sb_start_write+0xb4/0xf0
[ 109.981729] [<ffffffff985cbe94>] do_readv_writev+0x394/0x6a0
[ 109.991103] [<ffffffff9876de90>] ? ext4_unwritten_wait+0x1e0/0x1e0
[ 110.000348] [<ffffffff985cbb00>] ? vfs_write+0x4c0/0x4c0
[ 110.009503] [<ffffffff9823115f>] ? mark_held_locks+0xcf/0x130
[ 110.018660] [<ffffffff999ff3fd>] ? mutex_lock_nested+0x4ed/0x8d0
[ 110.027762] [<ffffffff999ff418>] ? mutex_lock_nested+0x508/0x8d0
[ 110.036778] [<ffffffff98625c22>] ? __fdget_pos+0x92/0xc0
[ 110.045809] [<ffffffff98231cd0>] ? debug_check_no_locks_freed+0x280/0x280
[ 110.054841] [<ffffffff982acc09>] ? do_setitimer+0x389/0x7f0
[ 110.063794] [<ffffffff98625c22>] ? __fdget_pos+0x92/0xc0
[ 110.072727] [<ffffffff982315b9>] ? trace_hardirqs_on_caller+0x3f9/0x580
[ 110.081643] [<ffffffff999fef10>] ? mutex_lock_interruptible_nested+0x9e0/0x9e0
[ 110.090467] [<ffffffff98aab907>] ? debug_smp_processor_id+0x17/0x20
[ 110.099135] [<ffffffff98226d2d>] ? get_lock_stats+0x1d/0x90
[ 110.107815] [<ffffffff985cc6b5>] vfs_writev+0x75/0xb0
[ 110.116379] [<ffffffff98625c22>] ? __fdget_pos+0x92/0xc0
[ 110.124868] [<ffffffff985cc7d5>] do_writev+0xe5/0x280
[ 110.133279] [<ffffffff985cc6f0>] ? vfs_writev+0xb0/0xb0
[ 110.141704] [<ffffffff985cf750>] ? SyS_readv+0x20/0x20
[ 110.150088] [<ffffffff985cf760>] SyS_writev+0x10/0x20
[ 110.158347] [<ffffffff980064b0>] do_syscall_64+0x1a0/0x4e0
[ 110.166496] [<ffffffff9800301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 110.174666] [<ffffffff99a09b1a>] entry_SYSCALL64_slow_path+0x25/0x25

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