[syzbot] [btrfs?] general protection fault in btrfs_relocate_block_group

From: syzbot
Date: Tue Apr 15 2025 - 16:01:37 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 1a1d569a75f3 Merge tag 'edac_urgent_for_v6.15_rc3' of git:..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10f92470580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a972ee73c2fcf8ca
dashboard link: https://syzkaller.appspot.com/bug?extid=9b6689eb2b9692c761ea
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-1a1d569a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3cbccbd209b5/vmlinux-1a1d569a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2957e37f5adf/bzImage-1a1d569a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9b6689eb2b9692c761ea@xxxxxxxxxxxxxxxxxxxxxxxxx

loop0: detected capacity change from 0 to 32768
BTRFS: device fsid e417788f-7a09-42b2-9266-8ddc5d5d35d2 devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5328)
BTRFS info (device loop0): first mount of filesystem e417788f-7a09-42b2-9266-8ddc5d5d35d2
BTRFS info (device loop0): using xxhash64 (xxhash64-generic) checksum algorithm
BTRFS info (device loop0): disk space caching is enabled
BTRFS warning (device loop0): space cache v1 is being deprecated and will be removed in a future release, please use -o space_cache=v2
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
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
fail_dump lib/fault-inject.c:73 [inline]
should_fail_ex+0x424/0x570 lib/fault-inject.c:174
should_failslab+0xac/0x100 mm/failslab.c:46
slab_pre_alloc_hook mm/slub.c:4104 [inline]
slab_alloc_node mm/slub.c:4180 [inline]
kmem_cache_alloc_noprof+0x78/0x390 mm/slub.c:4207
add_delayed_ref+0x1a0/0x1e90 fs/btrfs/delayed-ref.c:1007
btrfs_free_tree_block+0x361/0xd10 fs/btrfs/extent-tree.c:3434
btrfs_force_cow_block+0xf6c/0x2010 fs/btrfs/ctree.c:555
btrfs_cow_block+0x377/0x840 fs/btrfs/ctree.c:688
btrfs_search_slot+0xc12/0x31c0 fs/btrfs/ctree.c:2088
btrfs_insert_empty_items+0x9c/0x1a0 fs/btrfs/ctree.c:4287
btrfs_insert_empty_item fs/btrfs/ctree.h:673 [inline]
btrfs_insert_empty_inode+0x1de/0x2f0 fs/btrfs/inode-item.c:391
__insert_orphan_inode fs/btrfs/relocation.c:3714 [inline]
create_reloc_inode+0x408/0xa50 fs/btrfs/relocation.c:3785
btrfs_relocate_block_group+0x554/0xd80 fs/btrfs/relocation.c:3991
btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3511
__btrfs_balance+0x1a93/0x25e0 fs/btrfs/volumes.c:4292
btrfs_balance+0xbde/0x10c0 fs/btrfs/volumes.c:4669
btrfs_ioctl_balance+0x3f5/0x660 fs/btrfs/ioctl.c:3586
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f830078d169
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:00007f83016c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f83009a5fa0 RCX: 00007f830078d169
RDX: 0000200000000440 RSI: 00000000c4009420 RDI: 0000000000000003
RBP: 00007f83016c0090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007f83009a5fa0 R15: 00007ffc9409cc88
</TASK>
BTRFS error (device loop0 state A): Transaction aborted (error -12)
BTRFS: error (device loop0 state A) in btrfs_force_cow_block:560: errno=-12 Out of memory
BTRFS info (device loop0 state EA): forced readonly
BTRFS info (device loop0 state EA): relocating block group 6881280 flags data|metadata
Oops: general protection fault, probably for non-canonical address 0xdffffc000000008c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000460-0x0000000000000467]
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:iput+0x3b/0xa50 fs/inode.c:1914
Code: 38 49 89 fe e8 f6 ef 7b ff 4d 85 f6 0f 84 8c 03 00 00 49 bd 00 00 00 00 00 fc ff df 4d 8d be d0 00 00 00 4c 89 fb 48 c1 eb 03 <42> 0f b6 04 2b 84 c0 0f 85 c4 08 00 00 48 89 5c 24 10 41 8b 1f bd
RSP: 0018:ffffc9000d0879c0 EFLAGS: 00010203
RAX: ffffffff8247653a RBX: 000000000000008c RCX: ffff888000cb2440
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000394
RBP: ffff888053019010 R08: ffff888052a5a80b R09: 1ffff1100a54b501
R10: dffffc0000000000 R11: ffffed100a54b502 R12: ffff888052a4c000
R13: dffffc0000000000 R14: 0000000000000394 R15: 0000000000000464
FS: 00007f83016c06c0(0000) GS:ffff88808c593000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f830169efd8 CR3: 0000000034ce6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
btrfs_relocate_block_group+0xb86/0xd80 fs/btrfs/relocation.c:4052
btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3511
__btrfs_balance+0x1a93/0x25e0 fs/btrfs/volumes.c:4292
btrfs_balance+0xbde/0x10c0 fs/btrfs/volumes.c:4669
btrfs_ioctl_balance+0x3f5/0x660 fs/btrfs/ioctl.c:3586
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f830078d169
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:00007f83016c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f83009a5fa0 RCX: 00007f830078d169
RDX: 0000200000000440 RSI: 00000000c4009420 RDI: 0000000000000003
RBP: 00007f83016c0090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007f83009a5fa0 R15: 00007ffc9409cc88
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:iput+0x3b/0xa50 fs/inode.c:1914
Code: 38 49 89 fe e8 f6 ef 7b ff 4d 85 f6 0f 84 8c 03 00 00 49 bd 00 00 00 00 00 fc ff df 4d 8d be d0 00 00 00 4c 89 fb 48 c1 eb 03 <42> 0f b6 04 2b 84 c0 0f 85 c4 08 00 00 48 89 5c 24 10 41 8b 1f bd
RSP: 0018:ffffc9000d0879c0 EFLAGS: 00010203
RAX: ffffffff8247653a RBX: 000000000000008c RCX: ffff888000cb2440
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000394
RBP: ffff888053019010 R08: ffff888052a5a80b R09: 1ffff1100a54b501
R10: dffffc0000000000 R11: ffffed100a54b502 R12: ffff888052a4c000
R13: dffffc0000000000 R14: 0000000000000394 R15: 0000000000000464
FS: 00007f83016c06c0(0000) GS:ffff88808c593000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f830167dfd8 CR3: 0000000034ce6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 49 89 fe mov %rdi,%r14
3: e8 f6 ef 7b ff call 0xff7beffe
8: 4d 85 f6 test %r14,%r14
b: 0f 84 8c 03 00 00 je 0x39d
11: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
18: fc ff df
1b: 4d 8d be d0 00 00 00 lea 0xd0(%r14),%r15
22: 4c 89 fb mov %r15,%rbx
25: 48 c1 eb 03 shr $0x3,%rbx
* 29: 42 0f b6 04 2b movzbl (%rbx,%r13,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 c4 08 00 00 jne 0x8fa
36: 48 89 5c 24 10 mov %rbx,0x10(%rsp)
3b: 41 8b 1f mov (%r15),%ebx
3e: bd .byte 0xbd

---
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Next message: Ankur Arora: "Re: [PATCH v3 1/4] x86/clear_page: extend clear_page*() for multi-page clearing"
Previous message: Simon Horman: "Re: [PATCH net-next v5 07/11] net: ti: prueth: Adds support for network filters for traffic control supported by PRU-ICSS"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]