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kernel BUG at fs/ocfs2/refcounttree.c:2890!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5984 Comm: syz.0.15 Not tainted 6.14.0-syzkaller-ga2cc6ff5ec8f #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:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2890
Code: 02 75 21 e8 39 e8 f6 fd 4c 89 f7 be 08 00 00 00 e8 4c 0f 61 fe 3e 41 80 26 ef 31 c0 5b 41 5e c3 cc cc cc cc e8 18 e8 f6 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d326f60 EFLAGS: 00010293
RAX: ffffffff83cc6f68 RBX: 0000000000000002 RCX: ffff8880001f0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000001000 R08: ffffffff83cc6f3c R09: 1ffff1100909f53f
R10: dffffc0000000000 R11: ffffed100909f540 R12: ffff8880484fa9f8
R13: ffff8880484fabc8 R14: ffff8880484fa9f8 R15: 0000000000000000
FS:  00007f25497d76c0(0000) GS:ffff88808c599000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4bb065290a CR3: 0000000054138000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 walk_page_buffers+0x104/0x1d0 fs/ocfs2/aops.c:419
 ocfs2_duplicate_clusters_by_page+0x779/0xdd0 fs/ocfs2/refcounttree.c:2969
 ocfs2_replace_clusters fs/ocfs2/refcounttree.c:3120 [inline]
 ocfs2_make_clusters_writable fs/ocfs2/refcounttree.c:3252 [inline]
 ocfs2_replace_cow+0xd75/0x25c0 fs/ocfs2/refcounttree.c:3346
 ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3424 [inline]
 ocfs2_refcount_cow+0x9cb/0x11d0 fs/ocfs2/refcounttree.c:3467
 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2340 [inline]
 ocfs2_file_write_iter+0x10f4/0x20d0 fs/ocfs2/file.c:2451
 do_iter_readv_writev+0x71f/0x9d0 fs/read_write.c:-1
 vfs_writev+0x38d/0xbc0 fs/read_write.c:1055
 do_pwritev fs/read_write.c:1151 [inline]
 __do_sys_pwritev2 fs/read_write.c:1209 [inline]
 __se_sys_pwritev2+0x1b8/0x2d0 fs/read_write.c:1200
 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: 0033:0x7f254897e719
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:00007f25497d7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f2548b35f80 RCX: 00007f254897e719
RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007f25489f132e R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2548b35f80 R15: 00007ffef2fcb908
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_clear_cow_buffer+0x79/0x80 fs/ocfs2/refcounttree.c:2890
Code: 02 75 21 e8 39 e8 f6 fd 4c 89 f7 be 08 00 00 00 e8 4c 0f 61 fe 3e 41 80 26 ef 31 c0 5b 41 5e c3 cc cc cc cc e8 18 e8 f6 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d326f60 EFLAGS: 00010293
RAX: ffffffff83cc6f68 RBX: 0000000000000002 RCX: ffff8880001f0000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000001000 R08: ffffffff83cc6f3c R09: 1ffff1100909f53f
R10: dffffc0000000000 R11: ffffed100909f540 R12: ffff8880484fa9f8
R13: ffff8880484fabc8 R14: ffff8880484fa9f8 R15: 0000000000000000
FS:  00007f25497d76c0(0000) GS:ffff88808c599000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c13bff000 CR3: 0000000054138000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400