================================================================== BUG: KASAN: null-ptr-deref in atomic64_read include/generated/atomic-instrumented.h:836 [inline] BUG: KASAN: null-ptr-deref in atomic_long_read include/generated/atomic-long.h:28 [inline] BUG: KASAN: null-ptr-deref in page_counter_read include/linux/page_counter.h:47 [inline] BUG: KASAN: null-ptr-deref in reclaim_high.constprop.0+0xa6/0x1e0 mm/memcontrol.c:2149 Read of size 8 at addr 0000000000000138 by task syz-executor4/32624 CPU: 0 PID: 32624 Comm: syz-executor4 Not tainted 5.0.0-rc4-next-20190130 #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:102 atomic64_read include/generated/atomic-instrumented.h:836 [inline] atomic_long_read include/generated/atomic-long.h:28 [inline] page_counter_read include/linux/page_counter.h:47 [inline] reclaim_high.constprop.0+0xa6/0x1e0 mm/memcontrol.c:2149 mem_cgroup_handle_over_high+0xc1/0x180 mm/memcontrol.c:2178 tracehook_notify_resume include/linux/tracehook.h:190 [inline] exit_to_usermode_loop+0x299/0x3b0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x519/0x5f0 arch/x86/entry/common.c:268 ret_from_fork+0x15/0x50 arch/x86/entry/entry_64.S:344 RIP: 0033:0x45665a Code: Bad RIP value. RSP: 002b:00007ffdaf15c9b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: 0000000000000000 RBX: 00007ffdaf15c9b0 RCX: 000000000045665a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffdaf15c9f0 R08: 0000000000000001 R09: 0000000002572940 R10: 0000000002572c10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000004 ==================================================================