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:00007f653712a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f6539159fa0 RCX: 00007f6538ed3b19 RDX: 00000000000001ff RSI: 0000200000007a00 RDI: ffffffffffffff9c RBP: 00007f6538f6bb70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f653915a038 R14: 00007f6539159fa0 R15: 00007ffe3f18cf68 ------------[ cut here ]------------ kernel BUG at fs/btrfs/extent-tree.c:3311! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4423 Comm: syz.3.24 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:btrfs_free_tree_block+0xb71/0xb80 fs/btrfs/extent-tree.c:3311 Code: e9 02 f9 ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 07 f9 ff ff be 08 00 00 00 4c 89 e7 e8 69 fb 78 fe e9 f5 f8 ff ff e8 6f b2 33 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 41 57 41 56 41 55 RSP: 0018:ffffc9000315f5a0 EFLAGS: 00010283 RAX: ffffffff83457b21 RBX: 1ffff1100edbcc24 RCX: 0000000000080000 RDX: ffffc9000c891000 RSI: 000000000005540d RDI: 000000000005540e RBP: ffffc9000315f6f0 R08: ffffffff9104720f R09: 1ffffffff2208e41 R10: dffffc0000000000 R11: fffffbfff2208e42 R12: ffff888029d19064 R13: ffff888076de6120 R14: 00000000fffffff4 R15: 0000000000000005 FS: 00007f653712a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560bd3c99950 CR3: 0000000025983000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_force_cow_block+0xc4d/0x1760 fs/btrfs/ctree.c:480 btrfs_cow_block+0x33e/0x7d0 fs/btrfs/ctree.c:598 btrfs_search_slot+0x9d4/0x2090 fs/btrfs/ctree.c:-1 btrfs_insert_empty_items+0x32c/0x3e0 fs/btrfs/ctree.c:4012 btrfs_new_inode+0x908/0x1830 fs/btrfs/inode.c:6674 btrfs_mkdir+0x2ac/0x5b0 fs/btrfs/inode.c:7072 vfs_mkdir+0x386/0x570 fs/namei.c:4116 do_mkdirat+0x1dd/0x5c0 fs/namei.c:4141 __do_sys_mkdirat fs/namei.c:4156 [inline] __se_sys_mkdirat fs/namei.c:4154 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4154 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: 0033:0x7f6538ed3b19 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:00007f653712a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f6539159fa0 RCX: 00007f6538ed3b19 RDX: 00000000000001ff RSI: 0000200000007a00 RDI: ffffffffffffff9c RBP: 00007f6538f6bb70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f653915a038 R14: 00007f6539159fa0 R15: 00007ffe3f18cf68 Modules linked in: ---[ end trace fed7d34bedb9c588 ]--- RIP: 0010:btrfs_free_tree_block+0xb71/0xb80 fs/btrfs/extent-tree.c:3311 Code: e9 02 f9 ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 07 f9 ff ff be 08 00 00 00 4c 89 e7 e8 69 fb 78 fe e9 f5 f8 ff ff e8 6f b2 33 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 41 57 41 56 41 55 RSP: 0018:ffffc9000315f5a0 EFLAGS: 00010283 RAX: ffffffff83457b21 RBX: 1ffff1100edbcc24 RCX: 0000000000080000 RDX: ffffc9000c891000 RSI: 000000000005540d RDI: 000000000005540e RBP: ffffc9000315f6f0 R08: ffffffff9104720f R09: 1ffffffff2208e41 R10: dffffc0000000000 R11: fffffbfff2208e42 R12: ffff888029d19064 R13: ffff888076de6120 R14: 00000000fffffff4 R15: 0000000000000005 FS: 00007f653712a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560bd3c99950 CR3: 0000000025983000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 c7 c1 e8 ff ff ff mov $0xffffffffffffffe8,%rcx 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W