------------[ cut here ]------------ WARNING: CPU: 1 PID: 5576 at fs/iomap/buffered-io.c:975 iomap_page_mkwrite_iter fs/iomap/buffered-io.c:975 [inline] WARNING: CPU: 1 PID: 5576 at fs/iomap/buffered-io.c:975 iomap_page_mkwrite+0x482/0x5d0 fs/iomap/buffered-io.c:998 Modules linked in: CPU: 1 PID: 5576 Comm: syz.3.296 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:iomap_page_mkwrite_iter fs/iomap/buffered-io.c:975 [inline] RIP: 0010:iomap_page_mkwrite+0x482/0x5d0 fs/iomap/buffered-io.c:998 Code: 80 3c 08 00 74 08 4c 89 f7 e8 4a 46 d9 ff 4d 8b 36 4c 89 f6 48 83 e6 04 31 ff e8 d9 e6 94 ff 49 83 e6 04 75 3c e8 ee e2 94 ff <0f> 0b eb 38 48 89 df 4c 89 f6 44 89 e2 31 c9 4d 89 e8 e8 77 2c f3 RSP: 0018:ffffc9000532f400 EFLAGS: 00010287 RAX: ffffffff81e2e132 RBX: ffffea00016fa880 RCX: 0000000000080000 RDX: ffffc90006249000 RSI: 0000000000034971 RDI: 0000000000034972 RBP: ffffc9000532f5b0 R08: dffffc0000000000 R09: fffff940002df511 R10: fffff940002df511 R11: 1ffffd40002df510 R12: 0000000000001000 R13: ffffc9000532f488 R14: 0000000000000000 R15: ffffc9000532f460 FS: 00007f1083c876c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000003af030 CR3: 0000000074df5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __xfs_filemap_fault+0x353/0x8d0 fs/xfs/xfs_file.c:1346 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922 wp_page_shared+0x16b/0x6d0 mm/memory.c:3259 handle_pte_fault mm/memory.c:4668 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1eca/0x43c0 mm/memory.c:4883 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357 handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:92 Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a RSP: 0018:ffffc9000532fa80 EFLAGS: 00050202 RAX: ffffffff83da7d01 RBX: 0000000000000020 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffc9000532fdd0 RDI: 0000200000000380 RBP: 0000000000000000 R08: 0000000000000300 R09: fffff52000a65fbe R10: fffff52000a65fbe R11: 1ffff92000a65fba R12: 00007ffffffff000 R13: 00002000000003a0 R14: ffffc9000532fdd0 R15: 0000200000000380 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0xf0/0x130 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:200 [inline] ioctl_fiemap fs/ioctl.c:224 [inline] do_vfs_ioctl+0x1487/0x1de0 fs/ioctl.c:814 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f1085e1f9a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1083c87038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1086046fa0 RCX: 00007f1085e1f9a9 RDX: 0000200000000380 RSI: 00000000c020660b RDI: 0000000000000004 RBP: 00007f1085ea1d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1086046fa0 R15: 00007fffb8082f48 ---------------- Code disassembly (best guess): 0: 38 4c 89 47 cmp %cl,0x47(%rcx,%rcx,4) 4: 20 4c 89 4f and %cl,0x4f(%rcx,%rcx,4) 8: 28 4c 89 57 sub %cl,0x57(%rcx,%rcx,4) c: 30 4c 89 5f xor %cl,0x5f(%rcx,%rcx,4) 10: 38 48 8d cmp %cl,-0x73(%rax) 13: 76 40 jbe 0x55 15: 48 8d 7f 40 lea 0x40(%rdi),%rdi 19: ff c9 dec %ecx 1b: 75 b6 jne 0xffffffd3 1d: 89 d1 mov %edx,%ecx 1f: 83 e2 07 and $0x7,%edx 22: c1 e9 03 shr $0x3,%ecx 25: 74 12 je 0x39 27: 4c 8b 06 mov (%rsi),%r8 * 2a: 4c 89 07 mov %r8,(%rdi) <-- trapping instruction 2d: 48 8d 76 08 lea 0x8(%rsi),%rsi 31: 48 8d 7f 08 lea 0x8(%rdi),%rdi 35: ff c9 dec %ecx 37: 75 ee jne 0x27 39: 21 d2 and %edx,%edx 3b: 74 10 je 0x4d 3d: 89 d1 mov %edx,%ecx 3f: 8a .byte 0x8a