EXT4-fs (loop0): pa ffff88812fe3c930: logic 0, phys. 193, len 32
EXT4-fs error (device loop0): ext4_mb_release_inode_pa:4902: group 0, free 13, pa_free 16
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4875!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 477 Comm: syz.0.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:ext4_mb_release_inode_pa+0xa8e/0xa90 fs/ext4/mballoc.c:4875
Code: 80 c2 03 38 c2 0f 8c 2f fe ff ff 48 89 df 41 89 ce e8 f6 8d cb ff 44 89 f1 e9 1c fe ff ff e8 59 5f 8c ff 0f 0b e8 52 5f 8c ff <0f> 0b 55 48 89 e5 41 57 41 56 53 48 89 fb 49 bf 00 00 00 00 00 fc
RSP: 0018:ffffc90000c96860 EFLAGS: 00010293
RAX: ffffffff81dd678e RBX: 00000000000000ed RCX: ffff88811a8e8000
RDX: 0000000000000000 RSI: 0000000000000060 RDI: 0000000000000000
RBP: ffffc90000c969b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000192d28 R12: 1ffff92000192d24
R13: dffffc0000000000 R14: 0000000000000060 R15: ffff888109972e70
FS:  00007f94f89e06c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020021000 CR3: 000000011aad2000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_discard_group_preallocations+0xbaa/0xdf0 fs/ext4/mballoc.c:5021
 ext4_mb_discard_preallocations fs/ext4/mballoc.c:5590 [inline]
 ext4_mb_discard_preallocations_should_retry+0x156/0x600 fs/ext4/mballoc.c:5611
 ext4_mb_new_blocks+0x313b/0x42c0 fs/ext4/mballoc.c:5814
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0xda7/0x2010 fs/ext4/indirect.c:635
 ext4_map_blocks+0x926/0x1b30 fs/ext4/inode.c:676
 _ext4_get_block+0x1ea/0x540 fs/ext4/inode.c:817
 ext4_get_block+0x39/0x50 fs/ext4/inode.c:834
 ext4_block_write_begin+0x563/0x1160 fs/ext4/inode.c:1102
 ext4_write_begin+0x65a/0x12e0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x321/0xbf0 fs/ext4/inode.c:2988
 generic_perform_write+0x2b7/0x690 mm/filemap.c:3870
 ext4_buffered_write_iter+0x4ed/0x670 fs/ext4/file.c:270
 ext4_file_write_iter+0x440/0x1540 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2212 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x835/0xfd0 fs/read_write.c:594
 ksys_write+0x149/0x250 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 0033:0x7f94f8f783b9
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:00007f94f89e0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94f91a6fa0 RCX: 00007f94f8f783b9
RDX: 000000000208e24b RSI: 0000000020000240 RDI: 0000000000000006
RBP: 00007f94f900916c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94f91a6fa0 R15: 00007ffe3c198b58
 </TASK>
Modules linked in:
---[ end trace bc989919657e07a1 ]---
RIP: 0010:ext4_mb_release_inode_pa+0xa8e/0xa90 fs/ext4/mballoc.c:4875
Code: 80 c2 03 38 c2 0f 8c 2f fe ff ff 48 89 df 41 89 ce e8 f6 8d cb ff 44 89 f1 e9 1c fe ff ff e8 59 5f 8c ff 0f 0b e8 52 5f 8c ff <0f> 0b 55 48 89 e5 41 57 41 56 53 48 89 fb 49 bf 00 00 00 00 00 fc
RSP: 0018:ffffc90000c96860 EFLAGS: 00010293
RAX: ffffffff81dd678e RBX: 00000000000000ed RCX: ffff88811a8e8000
RDX: 0000000000000000 RSI: 0000000000000060 RDI: 0000000000000000
RBP: ffffc90000c969b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000192d28 R12: 1ffff92000192d24
R13: dffffc0000000000 R14: 0000000000000060 R15: ffff888109972e70
FS:  00007f94f89e06c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020021000 CR3: 000000011aad2000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400