------------[ cut here ]------------
WARNING: CPU: 0 PID: 4326 at fs/iomap/buffered-io.c:975 iomap_page_mkwrite_iter fs/iomap/buffered-io.c:975 [inline]
WARNING: CPU: 0 PID: 4326 at fs/iomap/buffered-io.c:975 iomap_page_mkwrite+0x4b7/0x690 fs/iomap/buffered-io.c:998
Modules linked in:
CPU: 0 PID: 4326 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:iomap_page_mkwrite_iter fs/iomap/buffered-io.c:975 [inline]
RIP: 0010:iomap_page_mkwrite+0x4b7/0x690 fs/iomap/buffered-io.c:998
Code: 80 3c 08 00 74 08 4c 89 ff e8 e5 b8 d8 ff 4d 8b 3f 4c 89 fe 48 83 e6 04 31 ff e8 84 9c 93 ff 49 83 e7 04 75 3e e8 99 98 93 ff <0f> 0b eb 3a 4c 89 f7 4c 89 fe 44 89 ea 31 c9 4c 8b 44 24 08 e8 10
RSP: 0018:ffffc900030af820 EFLAGS: 00010293
RAX: ffffffff81e55a07 RBX: 1ffff92000615f08 RCX: ffff888027f20000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900030af9b0 R08: ffffea0001a78687 R09: 1ffffd400034f0d0
R10: dffffc0000000000 R11: fffff9400034f0d1 R12: ffffc900030af860
R13: 0000000000001000 R14: ffffea0001a78680 R15: 0000000000000000
FS:  00007f48cac326c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001cb000 CR3: 000000002a8d8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __xfs_filemap_fault+0x3be/0x8e0 fs/xfs/xfs_file.c:1346
 do_page_mkwrite+0x168/0x3c0 mm/memory.c:2922
 wp_page_shared+0x163/0x6c0 mm/memory.c:3259
 handle_pte_fault mm/memory.c:4668 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1fbd/0x4440 mm/memory.c:4883
 do_user_addr_fault+0x494/0xc90 arch/x86/mm/fault.c:1355
 handle_page_fault arch/x86/mm/fault.c:1443 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1496
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:__put_user_nocheck_4+0x3/0x11
Code: 00 00 48 39 d9 73 54 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 90 90 90 90 90 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 01 cb <89> 01 31 c9 0f 01 ca c3 90 90 90 90 90 90 48 bb f9 ef ff ff ff 7f
RSP: 0018:ffffc900030afe80 EFLAGS: 00050293
RAX: 0000000000000005 RBX: 00007fffffffeffd RCX: 0000200000000240
RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a79c980
RBP: 0000000000000005 R08: ffffffff8d89e06f R09: 1ffffffff1b13c0d
R10: dffffc0000000000 R11: fffffbfff1b13c0e R12: 0000000000000000
R13: 0000200000000240 R14: 0000000000000001 R15: 0000000000000001
 __sys_socketpair+0xb4/0x540 net/socket.c:1639
 __do_sys_socketpair net/socket.c:1705 [inline]
 __se_sys_socketpair net/socket.c:1702 [inline]
 __x64_sys_socketpair+0x97/0xb0 net/socket.c:1702
 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: 0033:0x7f48cb612e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f48cac32028 EFLAGS: 00000246
 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f48cb88c180 RCX: 00007f48cb612e59
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: 00007f48cb6a8e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000240 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f48cb88c218 R14: 00007f48cb88c180 R15: 00007ffd9432f018
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	48 39 d9             	cmp    %rbx,%rcx
   5:	73 54                	jae    0x5b
   7:	0f 01 cb             	stac
   a:	66 89 01             	mov    %ax,(%rcx)
   d:	31 c9                	xor    %ecx,%ecx
   f:	0f 01 ca             	clac
  12:	c3                   	ret
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	48 bb fd ef ff ff ff 	movabs $0x7fffffffeffd,%rbx
  1f:	7f 00 00
  22:	48 39 d9             	cmp    %rbx,%rcx
  25:	73 34                	jae    0x5b
  27:	0f 01 cb             	stac
* 2a:	89 01                	mov    %eax,(%rcx) <-- trapping instruction
  2c:	31 c9                	xor    %ecx,%ecx
  2e:	0f 01 ca             	clac
  31:	c3                   	ret
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	48                   	rex.W
  39:	bb f9 ef ff ff       	mov    $0xffffeff9,%ebx
  3e:	ff                   	(bad)
  3f:	7f                   	.byte 0x7f