RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00007fa362fe01d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff0221995f R14: 00007fa362fe0300 R15: 0000000000022000 ================================================================== 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 put_page_testzero include/linux/mm.h:875 [inline] BUG: KASAN: null-ptr-deref in folio_put_testzero include/linux/mm.h:881 [inline] BUG: KASAN: null-ptr-deref in folio_put include/linux/mm.h:1308 [inline] BUG: KASAN: null-ptr-deref in filemap_fault+0xde1/0x12f0 mm/filemap.c:3382 Read of size 4 at addr 0000000000000028 by task syz-executor.0/5421 CPU: 1 PID: 5421 Comm: syz-executor.0 Not tainted 6.3.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x167/0x220 lib/dump_stack.c:106 print_report+0xe6/0x540 mm/kasan/report.c:433 kasan_report+0x176/0x1b0 mm/kasan/report.c:536 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187 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] put_page_testzero include/linux/mm.h:875 [inline] folio_put_testzero include/linux/mm.h:881 [inline] folio_put include/linux/mm.h:1308 [inline] filemap_fault+0xde1/0x12f0 mm/filemap.c:3382 __do_fault+0x10f/0x380 mm/memory.c:4142 do_read_fault mm/memory.c:4493 [inline] do_fault mm/memory.c:4622 [inline] handle_pte_fault mm/memory.c:4910 [inline] __handle_mm_fault mm/memory.c:5053 [inline] handle_mm_fault+0x1385/0x3f70 mm/memory.c:5199 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline] handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x5b1/0x7c0 arch/x86/mm/fault.c:1554 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:fault_in_readable+0x142/0x310 mm/gup.c:1863 Code: 00 f0 ff ff eb 0a 4d 8d a0 ff 0f 00 00 4d 89 c6 49 01 f4 49 81 e4 00 f0 ff ff 4d 39 c4 72 6e 4d 39 e6 74 71 4c 89 f3 49 89 de <44> 8a 2b 41 0f b6 04 17 84 c0 75 16 4d 89 e6 44 88 6c 24 40 48 81 RSP: 0018:ffffc90004a579c0 EFLAGS: 00050287 RAX: 0000000000000000 RBX: 0000000020000000 RCX: 0000000004a57a00 RDX: dffffc0000000000 RSI: 0000000000001000 RDI: 1ffff9200094af3c RBP: ffffc90004a57a78 R08: 0000000020000000 R09: ffffc90004a57a00 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000020001000 R13: dffffc0000000000 R14: 0000000020000000 R15: 1ffff9200094af40 fault_in_iov_iter_readable+0xc5/0x220 lib/iov_iter.c:350 generic_perform_write+0x227/0x540 mm/filemap.c:3913 __generic_file_write_iter+0x143/0x340 mm/filemap.c:4051 udf_file_write_iter+0x253/0x530 fs/udf/file.c:115 call_write_iter include/linux/fs.h:1851 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7ef/0xac0 fs/read_write.c:584 ksys_write+0x163/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa36228c169 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:00007fa362fe0168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa3623abf80 RCX: 00007fa36228c169 RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00007fa362fe01d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff0221995f R14: 00007fa362fe0300 R15: 0000000000022000 ================================================================== ---------------- Code disassembly (best guess), 4 bytes skipped: 0: eb 0a jmp 0xc 2: 4d 8d a0 ff 0f 00 00 lea 0xfff(%r8),%r12 9: 4d 89 c6 mov %r8,%r14 c: 49 01 f4 add %rsi,%r12 f: 49 81 e4 00 f0 ff ff and $0xfffffffffffff000,%r12 16: 4d 39 c4 cmp %r8,%r12 19: 72 6e jb 0x89 1b: 4d 39 e6 cmp %r12,%r14 1e: 74 71 je 0x91 20: 4c 89 f3 mov %r14,%rbx 23: 49 89 de mov %rbx,%r14 * 26: 44 8a 2b mov (%rbx),%r13b <-- trapping instruction 29: 41 0f b6 04 17 movzbl (%r15,%rdx,1),%eax 2e: 84 c0 test %al,%al 30: 75 16 jne 0x48 32: 4d 89 e6 mov %r12,%r14 35: 44 88 6c 24 40 mov %r13b,0x40(%rsp) 3a: 48 rex.W 3b: 81 .byte 0x81