EXT4-fs (loop5): pa ffff88811cd93d20: logic 0, phys. 193, len 32
EXT4-fs error (device loop5): ext4_mb_release_inode_pa:4367: group 0, free 13, pa_free 16
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4340!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 629 Comm: syz.5.35 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:ext4_mb_release_inode_pa+0x9ee/0x9f0 fs/ext4/mballoc.c:4340
Code: 80 c2 03 38 c2 0f 8c 3f fe ff ff 48 89 df 41 89 ce e8 96 9c cb ff 44 89 f1 e9 2c fe ff ff e8 d9 1b 91 ff 0f 0b e8 d2 1b 91 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:ffffc90001086860 EFLAGS: 00010293
RAX: ffffffff81d398de RBX: 00000000000000ed RCX: ffff88811d3d1400
RDX: 0000000000000000 RSI: 0000000000000060 RDI: 0000000000000000
RBP: ffffc900010869b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000210d28 R12: 00000000000000ed
R13: dffffc0000000000 R14: 0000000000000060 R15: 0000000000000000
FS:  00007f093bf966c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01ef892000 CR3: 000000012a153000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_mb_discard_group_preallocations+0xbda/0xe20 fs/ext4/mballoc.c:4486
 ext4_mb_discard_preallocations fs/ext4/mballoc.c:5052 [inline]
 ext4_mb_discard_preallocations_should_retry+0x156/0x600 fs/ext4/mballoc.c:5073
 ext4_mb_new_blocks+0x3045/0x4190 fs/ext4/mballoc.c:5276
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0xf0c/0x2110 fs/ext4/indirect.c:633
 ext4_map_blocks+0x923/0x1b10 fs/ext4/inode.c:678
 _ext4_get_block+0x1d1/0x4e0 fs/ext4/inode.c:819
 ext4_get_block+0x39/0x50 fs/ext4/inode.c:836
 ext4_block_write_begin+0x527/0x1220 fs/ext4/inode.c:1103
 ext4_write_begin+0x6c1/0x1730 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x32b/0xec0 fs/ext4/inode.c:3035
 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509
 ext4_buffered_write_iter+0x48c/0x620 fs/ext4/file.c:271
 ext4_file_write_iter+0x49a/0x19a0 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2072 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x770/0xd70 fs/read_write.c:605
 ksys_write+0x14a/0x260 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: 0033:0x7f093c51f429
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:00007f093bf96028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f093c6ecf80 RCX: 00007f093c51f429
RDX: 000000000208e24b RSI: 0000000020000240 RDI: 0000000000000006
RBP: 00007f093c5a237f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f093c6ecf80 R15: 00007ffc6a257108
Modules linked in:
---[ end trace 7da06cc15ef9da65 ]---
RIP: 0010:ext4_mb_release_inode_pa+0x9ee/0x9f0 fs/ext4/mballoc.c:4340
Code: 80 c2 03 38 c2 0f 8c 3f fe ff ff 48 89 df 41 89 ce e8 96 9c cb ff 44 89 f1 e9 2c fe ff ff e8 d9 1b 91 ff 0f 0b e8 d2 1b 91 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:ffffc90001086860 EFLAGS: 00010293
RAX: ffffffff81d398de RBX: 00000000000000ed RCX: ffff88811d3d1400
RDX: 0000000000000000 RSI: 0000000000000060 RDI: 0000000000000000
RBP: ffffc900010869b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000210d28 R12: 00000000000000ed
R13: dffffc0000000000 R14: 0000000000000060 R15: 0000000000000000
FS:  00007f093bf966c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01ef892000 CR3: 000000012a153000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400