BTRFS info (device loop0): balance: start -s
BTRFS info (device loop0): relocating block group 1048576 flags system
BTRFS info (device loop0): balance: ended with status: 0
BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5111 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-05319-g4a39ac5b7d62 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
fail_dump lib/fault-inject.c:52 [inline]
should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153
should_failslab+0xac/0x100 mm/failslab.c:45
slab_pre_alloc_hook mm/slub.c:4039 [inline]
slab_alloc_node mm/slub.c:4115 [inline]
kmem_cache_alloc_noprof+0x6c/0x2a0 mm/slub.c:4142
start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676
prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642
relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678
btrfs_relocate_block_group+0x77d/0xd90 fs/btrfs/relocation.c:4150
btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3376
__btrfs_balance+0x1b0f/0x26b0 fs/btrfs/volumes.c:4160
btrfs_balance+0xbdc/0x10c0 fs/btrfs/volumes.c:4537
btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
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: 0033:0x7fbd2c17def9
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:00007fbd2cfb3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbd2c336058 RCX: 00007fbd2c17def9
RDX: 0000000020000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fbd2cfb3090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007fbd2c336058 R15: 00007ffecc525c58
BTRFS info (device loop0): balance: ended with status: -12
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000660-0x0000000000000667]
CPU: 0 UID: 0 PID: 5111 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-05319-g4a39ac5b7d62 #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:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926
Code: e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 87 fe 34 fe bb 65 06 00 00 49 03 1e 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 4c 8b 64 24 18 0f 85 c9 05 00 00 0f b6 1b 31 ff
RSP: 0018:ffffc9000b9df700 EFLAGS: 00010207
RAX: 00000000000000cc RBX: 0000000000000665 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff
RBP: ffffc9000b9df810 R08: ffffffff83c6635f R09: fffff5200173bef4
R10: dffffc0000000000 R11: fffff5200173bef4 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff88803d9111d0 R15: ffff888000e30038
FS: 00007fbd2cfb36c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd20dac000 CR3: 000000003436a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496
btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430
del_balance_item fs/btrfs/volumes.c:3678 [inline]
reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742
btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574
btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
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: 0033:0x7fbd2c17def9
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:00007fbd2cfb3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbd2c336058 RCX: 00007fbd2c17def9
RDX: 0000000020000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fbd2cfb3090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007fbd2c336058 R15: 00007ffecc525c58
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926
Code: e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 87 fe 34 fe bb 65 06 00 00 49 03 1e 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 4c 8b 64 24 18 0f 85 c9 05 00 00 0f b6 1b 31 ff
RSP: 0018:ffffc9000b9df700 EFLAGS: 00010207
RAX: 00000000000000cc RBX: 0000000000000665 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff
RBP: ffffc9000b9df810 R08: ffffffff83c6635f R09: fffff5200173bef4
R10: dffffc0000000000 R11: fffff5200173bef4 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff88803d9111d0 R15: ffff888000e30038
FS: 00007fbd2cfb36c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f220ec0098 CR3: 000000003436a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 03 42 80 3c call 0x3c804208
5: 20 00 and %al,(%rax)
7: 74 08 je 0x11
9: 4c 89 f7 mov %r14,%rdi
c: e8 87 fe 34 fe call 0xfe34fe98
11: bb 65 06 00 00 mov $0x665,%ebx
16: 49 03 1e add (%r14),%rbx
19: 48 89 d8 mov %rbx,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 4c 8b 64 24 18 mov 0x18(%rsp),%r12
35: 0f 85 c9 05 00 00 jne 0x604
3b: 0f b6 1b movzbl (%rbx),%ebx
3e: 31 ff xor %edi,%edi