EXT4-fs error (device loop4): ext4_mb_release_inode_pa:4375: group 0, free 40, pa_free 92
EXT4-fs (loop4): pa ffff88812d82d9d8: logic 8162, phys. 225, len 30
EXT4-fs error (device loop4): ext4_mb_release_inode_pa:4375: group 0, free 7, pa_free 29
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4348!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 416 Comm: syz.4.30 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_mb_release_inode_pa+0x9e8/0x9f0 fs/ext4/mballoc.c:4348
Code: 80 c2 03 38 c2 0f 8c 42 fe ff ff 48 89 df 41 89 ce e8 5c 96 cb ff 44 89 f1 e9 2f fe ff ff e8 4f 16 91 ff 0f 0b e8 48 16 91 ff <0f> 0b 66 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 53 48 89 fb 49 bf
RSP: 0018:ffffc900012267e0 EFLAGS: 00010283
RAX: ffffffff81d39d08 RBX: 000000000000000d RCX: 0000000000080000
RDX: ffffc90004145000 RSI: 000000000000ba6f RDI: 000000000000ba70
RBP: ffffc90001226930 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000244d18 R12: dffffc0000000000
R13: 00000000000002cf R14: 00000000000002cf R15: ffff88810d3ca888
FS:  00007f04cf62f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e404ff8 CR3: 0000000122812000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_mb_discard_group_preallocations+0xba9/0xde0 fs/ext4/mballoc.c:4494
 ext4_mb_discard_preallocations fs/ext4/mballoc.c:5060 [inline]
 ext4_mb_discard_preallocations_should_retry+0x156/0x600 fs/ext4/mballoc.c:5081
 ext4_mb_new_blocks+0x315e/0x4340 fs/ext4/mballoc.c:5284
 ext4_new_meta_blocks+0x169/0x360 fs/ext4/balloc.c:732
 ext4_alloc_branch fs/ext4/indirect.c:342 [inline]
 ext4_ind_map_blocks+0x106a/0x2240 fs/ext4/indirect.c:633
 ext4_map_blocks+0x91e/0x1bd0 fs/ext4/inode.c:676
 _ext4_get_block+0x1d1/0x4e0 fs/ext4/inode.c:817
 ext4_get_block+0x39/0x50 fs/ext4/inode.c:834
 ext4_block_write_begin+0x573/0x1340 fs/ext4/inode.c:1101
 ext4_write_begin+0x67e/0x1690 fs/ext4/ext4_jbd2.h:-1
 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509
 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271
 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1
 do_iter_readv_writev+0x478/0x5f0 fs/read_write.c:-1
 do_iter_write+0x189/0x630 fs/read_write.c:866
 vfs_writev+0x2a9/0x530 fs/read_write.c:939
 do_pwritev fs/read_write.c:1036 [inline]
 __do_sys_pwritev2 fs/read_write.c:1095 [inline]
 __se_sys_pwritev2+0x1af/0x2b0 fs/read_write.c:1086
 __x64_sys_pwritev2+0xbf/0xd0 fs/read_write.c:1086
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f04d0bd4799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f04cf62f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f04d0e4dfa0 RCX: 00007f04d0bd4799
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 000000000000000a
RBP: 00007f04d0c6ac99 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000007ffffe R11: 0000000000000246 R12: 0000000000000000
R13: 00007f04d0e4e038 R14: 00007f04d0e4dfa0 R15: 00007ffef06a7328
Modules linked in:
---[ end trace faac183a94765215 ]---
RIP: 0010:ext4_mb_release_inode_pa+0x9e8/0x9f0 fs/ext4/mballoc.c:4348
Code: 80 c2 03 38 c2 0f 8c 42 fe ff ff 48 89 df 41 89 ce e8 5c 96 cb ff 44 89 f1 e9 2f fe ff ff e8 4f 16 91 ff 0f 0b e8 48 16 91 ff <0f> 0b 66 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 53 48 89 fb 49 bf
RSP: 0018:ffffc900012267e0 EFLAGS: 00010283
RAX: ffffffff81d39d08 RBX: 000000000000000d RCX: 0000000000080000
RDX: ffffc90004145000 RSI: 000000000000ba6f RDI: 000000000000ba70
RBP: ffffc90001226930 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000244d18 R12: dffffc0000000000
R13: 00000000000002cf R14: 00000000000002cf R15: ffff88810d3ca888
FS:  00007f04cf62f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e404ff8 CR3: 0000000122812000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400