=======================================================
ocfs2: Slot 0 on device (7,0) was already allocated to this node!
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/suballoc.c:1387!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4905 Comm: syz.0.16 Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1387 [inline]
pc : ocfs2_claim_suballoc_bits+0x19f0/0x1b74 fs/ocfs2/suballoc.c:1927
lr : ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1387 [inline]
lr : ocfs2_claim_suballoc_bits+0x19f0/0x1b74 fs/ocfs2/suballoc.c:1927
sp : ffff80001f9b7100
x29: ffff80001f9b7340 x28: 1fffe0001b228c61 x27: 1fffe0001b228c66
x26: ffff80001f9b71c0 x25: 0000000000000000 x24: dfff800000000000
x23: ffff700003f36e38 x22: 0000000000000001 x21: ffff0000d9146330
x20: ffff0000e5e34400 x19: ffff0000e5e344c6 x18: 0000000000000000
x17: ffff800016cf0000 x16: ffff8000082bf3c8 x15: ffff8000167d04c0
x14: ffff0000d9108a00 x13: dfff800000000000 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff800009ce1da4
x8 : ffff0000d9108000 x7 : 0000000000000000 x6 : ffff80001f9b7560
x5 : ffff80001f9b7580 x4 : ffff80001f9b7400 x3 : 0000000000000001
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1387 [inline]
 ocfs2_claim_suballoc_bits+0x19f0/0x1b74 fs/ocfs2/suballoc.c:1927
 ocfs2_claim_new_inode+0x2ec/0x718 fs/ocfs2/suballoc.c:2210
 ocfs2_mknod_locked+0xfc/0x228 fs/ocfs2/namei.c:635
 ocfs2_mknod+0xe48/0x1e88 fs/ocfs2/namei.c:381
 ocfs2_mkdir+0x180/0x468 fs/ocfs2/namei.c:657
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4065
 do_mkdirat+0x1bc/0x508 fs/namei.c:4090
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d4210000 979e5b21 d4210000 979e5b1f (d4210000) 
---[ end trace 720b20886656f4b1 ]---