general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 453 Comm: syz-executor.0 Not tainted 5.15.82-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:ext4_xattr_inode_create fs/ext4/xattr.c:1429 [inline] RIP: 0010:ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1537 [inline] RIP: 0010:ext4_xattr_set_entry+0x276a/0x3950 fs/ext4/xattr.c:1665 Code: 8b 1b 48 83 c3 68 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 54 f1 b4 ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 37 f1 b4 ff 4c 8b 23 48 8b 44 24 RSP: 0018:ffffc9000039f120 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff888106bf0000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff860f0374 RBP: ffffc9000039f3b0 R08: ffffffff816c7cf1 R09: ffffed102188d003 R10: ffffed102188d003 R11: 1ffff1102188d002 R12: ffffc9000039f2d4 R13: ffffffff860f0320 R14: ffff88810d250820 R15: dffffc0000000000 FS: 00005555571d5400(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555571de728 CR3: 000000011ecf3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_xattr_block_set+0x8f8/0x3820 fs/ext4/xattr.c:1971 ext4_xattr_move_to_block fs/ext4/xattr.c:2603 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2672 [inline] ext4_expand_extra_isize_ea+0x1591/0x1f30 fs/ext4/xattr.c:2764 __ext4_expand_extra_isize+0x29e/0x3d0 fs/ext4/inode.c:5795 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5838 [inline] __ext4_mark_inode_dirty+0x4bf/0x7a0 fs/ext4/inode.c:5916 ext4_dirty_inode+0xbc/0x100 fs/ext4/inode.c:5948 __mark_inode_dirty+0x1f9/0x9d0 fs/fs-writeback.c:2439 mark_inode_dirty_sync include/linux/fs.h:2382 [inline] iput+0x155/0x7d0 fs/inode.c:1686 dentry_unlink_inode+0x349/0x430 fs/dcache.c:376 __dentry_kill+0x3e2/0x5d0 fs/dcache.c:582 shrink_dentry_list+0x379/0x4d0 fs/dcache.c:1176 shrink_dcache_parent+0xcd/0x350 do_one_tree fs/dcache.c:1657 [inline] shrink_dcache_for_umount+0x7c/0x1a0 fs/dcache.c:1674 generic_shutdown_super+0x69/0x2e0 fs/super.c:447 kill_block_super+0x80/0xe0 fs/super.c:1396 deactivate_locked_super+0xb0/0x100 fs/super.c:335 deactivate_super+0xa5/0xd0 fs/super.c:366 cleanup_mnt+0x45f/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x147/0x1b0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xfd/0x110 kernel/entry/common.c:175 exit_to_user_mode_prepare kernel/entry/common.c:207 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x79/0xc0 kernel/entry/common.c:300 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f8516e23547 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 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:00007ffcd49ab848 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8516e23547 RDX: 00007ffcd49ab919 RSI: 000000000000000a RDI: 00007ffcd49ab910 RBP: 00007ffcd49ab910 R08: 00000000ffffffff R09: 00007ffcd49ab6e0 R10: 00005555571d6793 R11: 0000000000000246 R12: 00007f8516e7cb24 R13: 00007ffcd49ac9d0 R14: 00005555571d66f0 R15: 00007ffcd49aca10 Modules linked in: ---[ end trace bbe24e05c12a4dcf ]--- RIP: 0010:ext4_xattr_inode_create fs/ext4/xattr.c:1429 [inline] RIP: 0010:ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1537 [inline] RIP: 0010:ext4_xattr_set_entry+0x276a/0x3950 fs/ext4/xattr.c:1665 Code: 8b 1b 48 83 c3 68 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 54 f1 b4 ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 37 f1 b4 ff 4c 8b 23 48 8b 44 24 RSP: 0018:ffffc9000039f120 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff888106bf0000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff860f0374 RBP: ffffc9000039f3b0 R08: ffffffff816c7cf1 R09: ffffed102188d003 R10: ffffed102188d003 R11: 1ffff1102188d002 R12: ffffc9000039f2d4 R13: ffffffff860f0320 R14: ffff88810d250820 R15: dffffc0000000000 FS: 00005555571d5400(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561561fcf048 CR3: 000000011ecf3000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 1b mov (%rbx),%ebx 2: 48 83 c3 68 add $0x68,%rbx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 54 f1 b4 ff callq 0xffb4f170 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 30 add $0x30,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 37 f1 b4 ff callq 0xffb4f170 39: 4c 8b 23 mov (%rbx),%r12 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 44 rex.R 3f: 24 .byte 0x24