loop0: detected capacity change from 0 to 32768 BTRFS: device fsid ed167579-eb65-4e76-9a50-61ac97e9b59d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5318) BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d BTRFS info (device loop0): using sha256 (sha256-avx2) checksum algorithm BTRFS info (device loop0): rebuilding free space tree BTRFS info (device loop0): disabling free space tree BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1) BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2) BTRFS info (device loop0): balance: start -d -m BTRFS info (device loop0): relocating block group 6881280 flags data|metadata BTRFS info (device loop0): relocating block group 5242880 flags data|metadata BTRFS info (device loop0): found 9 extents, stage: move data extents Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-12113-gbcc8eda6d349 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:do_perf_trace_btrfs__prelim_ref include/trace/events/btrfs.h:1926 [inline] RIP: 0010:perf_trace_btrfs__prelim_ref+0x32d/0x7b0 include/trace/events/btrfs.h:1926 Code: fd e9 b3 02 00 00 e8 62 ba e7 fd ba 10 00 00 00 48 89 df 31 f6 e8 f3 a4 52 fe 4c 89 64 24 08 49 8d 5e 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 04 a2 52 fe 4c 8b 23 49 8d 5d 18 RSP: 0018:ffffc9000d48ee00 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffffffff83b7b71d RDX: 0000000000000010 RSI: ffff888040fd4000 RDI: ffffe8ffffc478a0 RBP: ffffc9000d48ef00 R08: 764e65eb797516ed R09: 9db5e997ac61509a R10: 764e65eb797516ed R11: 9db5e997ac61509a R12: ffff88801fc376e0 R13: ffffe8ffffc47898 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f6eacdcc6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055633d524740 CR3: 000000003638c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_btrfs_prelim_ref_insert include/trace/events/btrfs.h:1976 [inline] prelim_ref_insert+0x1064/0x1250 fs/btrfs/backref.c:327 add_prelim_ref fs/btrfs/backref.c:414 [inline] add_direct_ref fs/btrfs/backref.c:424 [inline] add_inline_refs fs/btrfs/backref.c:1084 [inline] find_parent_nodes+0x5fb2/0x7bd0 fs/btrfs/backref.c:1485 btrfs_find_all_leafs+0xca/0x2c0 fs/btrfs/backref.c:1709 add_data_references+0x275/0x1330 fs/btrfs/relocation.c:3412 relocate_block_group+0x6bb/0xd40 fs/btrfs/relocation.c:3669 btrfs_relocate_block_group+0x77d/0xd90 fs/btrfs/relocation.c:4081 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3494 __btrfs_balance+0x1b0f/0x26b0 fs/btrfs/volumes.c:4278 btrfs_balance+0xbdc/0x10c0 fs/btrfs/volumes.c:4655 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3670 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6eabf80849 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:00007f6eacdcc058 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6eac145fa0 RCX: 00007f6eabf80849 RDX: 0000000020000180 RSI: 00000000c4009420 RDI: 0000000000000005 RBP: 00007f6eabff3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6eac145fa0 R15: 00007ffe107b0dd8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:do_perf_trace_btrfs__prelim_ref include/trace/events/btrfs.h:1926 [inline] RIP: 0010:perf_trace_btrfs__prelim_ref+0x32d/0x7b0 include/trace/events/btrfs.h:1926 Code: fd e9 b3 02 00 00 e8 62 ba e7 fd ba 10 00 00 00 48 89 df 31 f6 e8 f3 a4 52 fe 4c 89 64 24 08 49 8d 5e 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 04 a2 52 fe 4c 8b 23 49 8d 5d 18 RSP: 0018:ffffc9000d48ee00 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffffffff83b7b71d RDX: 0000000000000010 RSI: ffff888040fd4000 RDI: ffffe8ffffc478a0 RBP: ffffc9000d48ef00 R08: 764e65eb797516ed R09: 9db5e997ac61509a R10: 764e65eb797516ed R11: 9db5e997ac61509a R12: ffff88801fc376e0 R13: ffffe8ffffc47898 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f6eacdcc6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055633d524740 CR3: 000000003638c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: fd std 1: e9 b3 02 00 00 jmp 0x2b9 6: e8 62 ba e7 fd call 0xfde7ba6d b: ba 10 00 00 00 mov $0x10,%edx 10: 48 89 df mov %rbx,%rdi 13: 31 f6 xor %esi,%esi 15: e8 f3 a4 52 fe call 0xfe52a50d 1a: 4c 89 64 24 08 mov %r12,0x8(%rsp) 1f: 49 8d 5e 18 lea 0x18(%r14),%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 04 a2 52 fe call 0xfe52a23d 39: 4c 8b 23 mov (%rbx),%r12 3c: 49 8d 5d 18 lea 0x18(%r13),%rbx