EXT4-fs (loop8): pa ffff888120cbba80: logic 0, phys. 193, len 32
EXT4-fs error (device loop8): ext4_mb_release_inode_pa:4375: group 0, free 7, pa_free 16
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4348!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 558 Comm: syz.8.35 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 ec 95 cb ff 44 89 f1 e9 2f fe ff ff e8 ef 14 91 ff 0f 0b e8 e8 14 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:ffffc900010c6860 EFLAGS: 00010293
RAX: ffffffff81d3a168 RBX: 0000000000000060 RCX: ffff88810d7da780
RDX: 0000000000000000 RSI: 0000000000000060 RDI: 0000000000000000
RBP: ffffc900010c69b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000218d28 R12: dffffc0000000000
R13: 00000000000000fa R14: 00000000000000fa R15: ffff88811a923bd0
FS:  00007fcbf10b96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f247052e000 CR3: 00000001268bb000 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_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0xff8/0x2240 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
 ext4_da_write_begin+0x478/0xf10 fs/ext4/inode.c:3033
 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
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x758/0xdc0 fs/read_write.c:605
 ksys_write+0x149/0x250 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fcbf1642429
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:00007fcbf10b9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcbf180ff80 RCX: 00007fcbf1642429
RDX: 0000000000043451 RSI: 0000000020000200 RDI: 0000000000000007
RBP: 00007fcbf16c537f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcbf180ff80 R15: 00007fff189d8818
Modules linked in:
---[ end trace 587d4a578bd99cb0 ]---
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 ec 95 cb ff 44 89 f1 e9 2f fe ff ff e8 ef 14 91 ff 0f 0b e8 e8 14 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:ffffc900010c6860 EFLAGS: 00010293
RAX: ffffffff81d3a168 RBX: 0000000000000060 RCX: ffff88810d7da780
RDX: 0000000000000000 RSI: 0000000000000060 RDI: 0000000000000000
RBP: ffffc900010c69b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000218d28 R12: dffffc0000000000
R13: 00000000000000fa R14: 00000000000000fa R15: ffff88811a923bd0
FS:  00007fcbf10b96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f247052e000 CR3: 00000001268bb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400