================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: null-ptr-deref in page_ref_count include/linux/page_ref.h:67 [inline] BUG: KASAN: null-ptr-deref in folio_ref_count include/linux/page_ref.h:89 [inline] BUG: KASAN: null-ptr-deref in folio_get include/linux/mm.h:1167 [inline] BUG: KASAN: null-ptr-deref in hugetlb_fault+0x1423/0x23f0 mm/hugetlb.c:6112 Read of size 4 at addr 0000000000000034 by task syz-executor.0/11147 CPU: 0 PID: 11147 Comm: syz-executor.0 Not tainted 6.2.0-rc5-next-20230123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 kasan_report+0xc0/0xf0 mm/kasan/report.c:517 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] page_ref_count include/linux/page_ref.h:67 [inline] folio_ref_count include/linux/page_ref.h:89 [inline] folio_get include/linux/mm.h:1167 [inline] hugetlb_fault+0x1423/0x23f0 mm/hugetlb.c:6112 handle_mm_fault+0x753/0x850 mm/memory.c:5196 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1407 handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1554 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:__put_user_8+0x16/0x20 arch/x86/lib/putuser.S:117 Code: 01 31 c9 0f 01 ca c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 bb f9 ef ff ff ff 7f 00 00 48 39 d9 73 30 0f 01 cb <48> 89 01 31 c9 0f 01 ca c3 90 f3 0f 1e fa f3 0f 1e fa 0f 01 cb 48 RSP: 0018:ffffc90004b8ff10 EFLAGS: 00050293 RAX: 00007f2c0c926000 RBX: 00007fffffffeff9 RCX: 00000000200004c0 RDX: 1ffff110101aeb35 RSI: ffffffff81f5a6ad RDI: ffff888080d759a8 RBP: 00000000200004c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888080d75980 R14: 0000000000000000 R15: 0000000000000000 __do_sys_io_setup fs/aio.c:1357 [inline] __se_sys_io_setup fs/aio.c:1337 [inline] __x64_sys_io_setup+0x128/0x210 fs/aio.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2c0bc8c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2c0c9aa168 EFLAGS: 00000246 ORIG_RAX: 00000000000000ce RAX: ffffffffffffffda RBX: 00007f2c0bdac120 RCX: 00007f2c0bc8c0c9 RDX: 0000000000000000 RSI: 00000000200004c0 RDI: 0000000000000001 RBP: 00007f2c0bce7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffa39c392f R14: 00007f2c0c9aa300 R15: 0000000000022000 ================================================================== ---------------- Code disassembly (best guess): 0: 01 31 add %esi,(%rcx) 2: c9 leaveq 3: 0f 01 ca clac 6: c3 retq 7: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) e: 00 00 00 00 12: 66 90 xchg %ax,%ax 14: f3 0f 1e fa endbr64 18: 48 bb f9 ef ff ff ff movabs $0x7fffffffeff9,%rbx 1f: 7f 00 00 22: 48 39 d9 cmp %rbx,%rcx 25: 73 30 jae 0x57 27: 0f 01 cb stac * 2a: 48 89 01 mov %rax,(%rcx) <-- trapping instruction 2d: 31 c9 xor %ecx,%ecx 2f: 0f 01 ca clac 32: c3 retq 33: 90 nop 34: f3 0f 1e fa endbr64 38: f3 0f 1e fa endbr64 3c: 0f 01 cb stac 3f: 48 rex.W