EXT4-fs error (device loop4): ext4_ext_remove_space:2963: inode #17: comm syz-executor.4: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0)
EXT4-fs error (device loop4) in ext4_setattr:5732: Corrupt filesystem
EXT4-fs error (device loop3): ext4_map_blocks:739: inode #17: block 305: comm syz-executor.3: lblock 193 mapped to illegal pblock 305 (length 1)
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4.h:2870!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9638 Comm: syz-executor.3 Not tainted 4.19.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0x1460/0x1a90 fs/ext4/mballoc.c:1116
Code: 26 06 9f ff e9 b9 f6 ff ff e8 7c e9 7f ff e9 b4 f4 ff ff e8 72 e9 7f ff 48 89 ef e8 0a 06 9f ff e9 51 fa ff ff e8 60 e9 7f ff <0f> 0b e8 59 e9 7f ff 8b 54 24 1c 44 89 e6 48 89 ef e8 da d4 ff ff
RSP: 0018:ffff88808ebc7588 EFLAGS: 00010293
RAX: ffff88809b2aa680 RBX: ffff88808ebc76c8 RCX: ffffffff81e295e3
RDX: 0000000000000000 RSI: ffffffff81e2a930 RDI: 0000000000000004
RBP: ffff88809a99ec00 R08: 0000000000000000 R09: 00000000fffff95a
R10: 0000000000000004 R11: 0000000000000000 R12: 00000000fffff95a
R13: ffff88809a9f0c40 R14: ffff88809a99f280 R15: 0000000000000001
FS:  00007f0c5f920700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe0e1080000 CR3: 000000009ae13000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_discard_preallocations+0xaf4/0xfb0 fs/ext4/mballoc.c:4090
 ext4_truncate+0x74e/0x1380 fs/ext4/inode.c:4554
 ext4_truncate_failed_write fs/ext4/truncate.h:20 [inline]
 ext4_write_begin+0xb37/0x1610 fs/ext4/inode.c:1368
 ext4_da_write_begin+0x737/0x10e0 fs/ext4/inode.c:3051
 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170
 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295
 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665e9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0c5f920188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 000000000d4ba0ff RSI: 00000000200009c0 RDI: 0000000000000007
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffcd8abac1f R14: 00007f0c5f920300 R15: 0000000000022000
Modules linked in:
---[ end trace aa43e4f52afcc7bc ]---
RIP: 0010:ext4_get_group_info fs/ext4/ext4.h:2870 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0x1460/0x1a90 fs/ext4/mballoc.c:1116
Code: 26 06 9f ff e9 b9 f6 ff ff e8 7c e9 7f ff e9 b4 f4 ff ff e8 72 e9 7f ff 48 89 ef e8 0a 06 9f ff e9 51 fa ff ff e8 60 e9 7f ff <0f> 0b e8 59 e9 7f ff 8b 54 24 1c 44 89 e6 48 89 ef e8 da d4 ff ff
RSP: 0018:ffff88808ebc7588 EFLAGS: 00010293
EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue
RAX: ffff88809b2aa680 RBX: ffff88808ebc76c8 RCX: ffffffff81e295e3
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
RDX: 0000000000000000 RSI: ffffffff81e2a930 RDI: 0000000000000004
RBP: ffff88809a99ec00 R08: 0000000000000000 R09: 00000000fffff95a
R10: 0000000000000004 R11: 0000000000000000 R12: 00000000fffff95a
R13: ffff88809a9f0c40 R14: ffff88809a99f280 R15: 0000000000000001
FS:  00007f0c5f920700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68725df080 CR3: 000000009ae13000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	e9 b9 f6 ff ff       	jmpq   0xfffff6be
   5:	e8 7c e9 7f ff       	callq  0xff7fe986
   a:	e9 b4 f4 ff ff       	jmpq   0xfffff4c3
   f:	e8 72 e9 7f ff       	callq  0xff7fe986
  14:	48 89 ef             	mov    %rbp,%rdi
  17:	e8 0a 06 9f ff       	callq  0xff9f0626
  1c:	e9 51 fa ff ff       	jmpq   0xfffffa72
  21:	e8 60 e9 7f ff       	callq  0xff7fe986
  26:	0f 0b                	ud2     <-- trapping instruction
  28:	e8 59 e9 7f ff       	callq  0xff7fe986
  2d:	8b 54 24 1c          	mov    0x1c(%rsp),%edx
  31:	44 89 e6             	mov    %r12d,%esi
  34:	48 89 ef             	mov    %rbp,%rdi
  37:	e8 da d4 ff ff       	callq  0xffffd516