================================================================== 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-executor4/1948 CPU: 1 PID: 1948 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: 0033:0x458089 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcfa77e0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000458089 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000802102001ffc RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcfa77e16d4 R13: 00000000004be460 R14: 00000000004cea20 R15: 00000000ffffffff ==================================================================