================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] BUG: KASAN: null-ptr-deref in PageCompound include/linux/page-flags.h:196 [inline] BUG: KASAN: null-ptr-deref in PageHuge+0x19/0x170 mm/hugetlb.c:1551 Read of size 8 at addr 0000000000000000 by task syz-executor.0/10399 CPU: 0 PID: 10399 Comm: syz-executor.0 Not tainted 5.9.0-rc5-next-20200915-syzkaller #0 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+0x198/0x1fb lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:549 [inline] kasan_report.cold+0x5/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] PageCompound include/linux/page-flags.h:196 [inline] PageHuge+0x19/0x170 mm/hugetlb.c:1551 find_subpage include/linux/pagemap.h:410 [inline] find_get_incore_page+0x165/0x2e0 mm/swap_state.c:435 mincore_page+0x1e/0x310 mm/mincore.c:62 __mincore_unmapped_range+0x171/0x2c0 mm/mincore.c:82 mincore_unmapped_range+0x61/0xc0 mm/mincore.c:94 walk_pmd_range mm/pagewalk.c:76 [inline] walk_pud_range mm/pagewalk.c:160 [inline] walk_p4d_range mm/pagewalk.c:193 [inline] walk_pgd_range mm/pagewalk.c:229 [inline] __walk_page_range+0x178e/0x22c0 mm/pagewalk.c:331 walk_page_range+0x20d/0x400 mm/pagewalk.c:427 do_mincore mm/mincore.c:199 [inline] __do_sys_mincore+0x279/0x7a0 mm/mincore.c:264 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5f9 Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f402e95ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000001b RAX: ffffffffffffffda RBX: 0000000000020ac0 RCX: 000000000045d5f9 RDX: 0000000000000000 RSI: 0000000000400000 RDI: 0000000020000000 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe12e1f1ff R14: 00007f402e95b9c0 R15: 000000000118cf4c ==================================================================