EXT4-fs error (device loop0): ext4_map_blocks:731: inode #18: block 125: comm syz.0.319: lblock 199 mapped to illegal pblock 125 (length 1)
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kernel BUG at fs/ext4/ext4.h:2985!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1414 Comm: syz.0.319 Tainted: G        W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2985 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0xeb2/0xed0 fs/ext4/mballoc.c:1117
Code: ff e8 82 5e cd ff e9 82 f3 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c c8 f3 ff ff e8 88 5e cd ff e9 be f3 ff ff e8 ce 63 9f ff <0f> 0b e8 c7 63 9f ff 0f 0b e8 c0 63 9f ff 0f 0b e8 b9 63 9f ff 0f
RSP: 0018:ffff8881e7027348 EFLAGS: 00010283
RAX: ffffffff81c01b12 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90001547000 RSI: 00000000000496e9 RDI: 00000000000496ea
RBP: ffff8881e70273d0 R08: dffffc0000000000 R09: ffff8881e7027428
R10: ffffed103ce04e8c R11: 1ffff1103ce04e85 R12: 1ffff1103d4a067e
R13: ffff8881ea500000 R14: ffff8881ea503018 R15: 00000000fffc9060
FS:  00007fbaa38ef6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f265565b000 CR3: 00000001d18bb000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_discard_preallocations+0x5b2/0xae0 fs/ext4/mballoc.c:4124
 ext4_truncate+0xa08/0x1270 fs/ext4/inode.c:4638
 ext4_truncate_failed_write fs/ext4/truncate.h:20 [inline]
 ext4_write_begin+0xc0b/0x1700 fs/ext4/inode.c:1388
 generic_perform_write+0x2b8/0x500 mm/filemap.c:3450
 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3579
 ext4_file_write_iter+0x468/0xf90 fs/ext4/file.c:270
 call_write_iter include/linux/fs.h:1991 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0x480/0x5d0 fs/read_write.c:496
 vfs_write+0x20e/0x4c0 fs/read_write.c:558
 ksys_write+0x140/0x240 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:620
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fbaa5286969
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:00007fbaa38ef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbaa54adfa0 RCX: 00007fbaa5286969
RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007fbaa5308ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbaa54adfa0 R15: 00007ffe67b0c568
Modules linked in:
---[ end trace b87b03c578463f1c ]---
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2985 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0xeb2/0xed0 fs/ext4/mballoc.c:1117
Code: ff e8 82 5e cd ff e9 82 f3 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c c8 f3 ff ff e8 88 5e cd ff e9 be f3 ff ff e8 ce 63 9f ff <0f> 0b e8 c7 63 9f ff 0f 0b e8 c0 63 9f ff 0f 0b e8 b9 63 9f ff 0f
RSP: 0018:ffff8881e7027348 EFLAGS: 00010283
RAX: ffffffff81c01b12 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90001547000 RSI: 00000000000496e9 RDI: 00000000000496ea
RBP: ffff8881e70273d0 R08: dffffc0000000000 R09: ffff8881e7027428
R10: ffffed103ce04e8c R11: 1ffff1103ce04e85 R12: 1ffff1103d4a067e
R13: ffff8881ea500000 R14: ffff8881ea503018 R15: 00000000fffc9060
FS:  00007fbaa38ef6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556cffd4e8 CR3: 00000001d18bb000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400