loop0: detected capacity change from 0 to 8 general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 5061 Comm: syz-executor165 Not tainted 6.2.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:cache_first_page+0x60/0x90 fs/squashfs/page_actor.c:27 Code: 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 30 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 89 da 48 c1 ea 03 <80> 3c 02 00 75 0c 48 8b 03 5b c3 e8 80 47 92 ff eb bc 48 89 df e8 RSP: 0018:ffffc90003cbfac0 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff823d0d6d RDI: ffff88801e25da40 RBP: ffff88807c718000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 000000000000035c R15: 0000000000000000 FS: 000055555707d300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc5ca52000 CR3: 0000000026419000 CR4: 0000000000350ef0 Call Trace: squashfs_first_page fs/squashfs/page_actor.h:43 [inline] copy_bio_to_actor fs/squashfs/block.c:44 [inline] squashfs_read_data+0x7de/0xf50 fs/squashfs/block.c:221 squashfs_read_table+0x15c/0x1f0 fs/squashfs/cache.c:432 squashfs_read_xattr_id_table+0x20c/0x440 fs/squashfs/xattr_id.c:95 squashfs_fill_super+0xf08/0x2700 fs/squashfs/super.c:348 get_tree_bdev+0x444/0x760 fs/super.c:1282 vfs_get_tree+0x8d/0x2f0 fs/super.c:1489 do_new_mount fs/namespace.c:3145 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3475 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount fs/namespace.c:3674 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3674 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: 0033:0x7fc524a6fafa Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc5ca51ad8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fc524a6fafa RDX: 0000000020000200 RSI: 0000000020000240 RDI: 00007ffc5ca51af0 RBP: 00007ffc5ca51af0 R08: 00007ffc5ca51b30 R09: 00000000000001f1 R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000004 R13: 000055555707d2c0 R14: 0000000000000000 R15: 00007ffc5ca51b30 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:cache_first_page+0x60/0x90 fs/squashfs/page_actor.c:27 Code: 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 30 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 89 da 48 c1 ea 03 <80> 3c 02 00 75 0c 48 8b 03 5b c3 e8 80 47 92 ff eb bc 48 89 df e8 RSP: 0018:ffffc90003cbfac0 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff823d0d6d RDI: ffff88801e25da40 RBP: ffff88807c718000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 000000000000035c R15: 0000000000000000 FS: 000055555707d300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc5ca52000 CR3: 0000000026419000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 9: fc ff df c: 48 c1 ea 03 shr $0x3,%rdx 10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 14: 75 30 jne 0x46 16: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1d: fc ff df 20: 48 8b 1b mov (%rbx),%rbx 23: 48 89 da mov %rbx,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 0c jne 0x3c 30: 48 8b 03 mov (%rbx),%rax 33: 5b pop %rbx 34: c3 retq 35: e8 80 47 92 ff callq 0xff9247ba 3a: eb bc jmp 0xfffffff8 3c: 48 89 df mov %rbx,%rdi 3f: e8 .byte 0xe8