BTRFS info (device loop0): using spread ssd allocation scheme
BTRFS info (device loop0): ignoring data csums
BTRFS info (device loop0): using free space tree
BTRFS info (device loop0): has skinny extents
BTRFS info (device loop0): scrub: started on devid 1
general protection fault, probably for non-canonical address 0xdffffc000000003e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000001f0-0x00000000000001f7]
CPU: 0 PID: 4334 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:btrfs_reada_add+0x81/0x520 fs/btrfs/reada.c:974
Code: 67 fe 48 85 c0 0f 84 9b 02 00 00 49 89 c4 49 8d af f0 01 00 00 48 89 e9 48 c1 e9 03 48 b8 00 00 00 00 00 fc ff df 48 89 0c 24 <80> 3c 01 00 74 08 48 89 ef e8 f1 68 68 fe 4c 89 e3 48 89 6c 24 08
RSP: 0018:ffffc90002fff330 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 000000000000003e
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: 0000000000000000
RBP: 00000000000001f0 R08: dffffc0000000000 R09: fffffbfff18e67a9
R10: fffffbfff18e67a9 R11: 1ffffffff18e67a8 R12: ffff888142d8f000
R13: ffffc90002fff730 R14: ffffc90002fff770 R15: 0000000000000000
FS: 000055556957c500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30763fff CR3: 000000007a01b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
scrub_stripe+0xb25/0x37b0 fs/btrfs/scrub.c:3281
scrub_chunk+0x2b7/0x3b0 fs/btrfs/scrub.c:3618
scrub_enumerate_chunks+0xc8e/0x1910 fs/btrfs/scrub.c:3865
btrfs_scrub_dev+0x7cf/0x1100 fs/btrfs/scrub.c:4225
btrfs_ioctl_scrub+0x1b2/0x280 fs/btrfs/ioctl.c:3751
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
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: 0033:0x7f98f5bfdc29
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:00007fff73555e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f98f5e44fa0 RCX: 00007f98f5bfdc29
RDX: 0000200000000000 RSI: 00000000c400941b RDI: 0000000000000004
RBP: 00007f98f5c80e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98f5e44fa0 R14: 00007f98f5e44fa0 R15: 0000000000000003
</TASK>
Modules linked in:
---[ end trace 0d15ab3f25e34c87 ]---
RIP: 0010:btrfs_reada_add+0x81/0x520 fs/btrfs/reada.c:974
Code: 67 fe 48 85 c0 0f 84 9b 02 00 00 49 89 c4 49 8d af f0 01 00 00 48 89 e9 48 c1 e9 03 48 b8 00 00 00 00 00 fc ff df 48 89 0c 24 <80> 3c 01 00 74 08 48 89 ef e8 f1 68 68 fe 4c 89 e3 48 89 6c 24 08
RSP: 0018:ffffc90002fff330 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 000000000000003e
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: 0000000000000000
RBP: 00000000000001f0 R08: dffffc0000000000 R09: fffffbfff18e67a9
R10: fffffbfff18e67a9 R11: 1ffffffff18e67a8 R12: ffff888142d8f000
R13: ffffc90002fff730 R14: ffffc90002fff770 R15: 0000000000000000
FS: 000055556957c500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558c84c96698 CR3: 000000007a01b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 48 85 c0 test %rax,%rax
3: 0f 84 9b 02 00 00 je 0x2a4
9: 49 89 c4 mov %rax,%r12
c: 49 8d af f0 01 00 00 lea 0x1f0(%r15),%rbp
13: 48 89 e9 mov %rbp,%rcx
16: 48 c1 e9 03 shr $0x3,%rcx
1a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
21: fc ff df
24: 48 89 0c 24 mov %rcx,(%rsp)
* 28: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) <-- trapping instruction
2c: 74 08 je 0x36
2e: 48 89 ef mov %rbp,%rdi
31: e8 f1 68 68 fe call 0xfe686927
36: 4c 89 e3 mov %r12,%rbx
39: 48 89 6c 24 08 mov %rbp,0x8(%rsp)