syzbot

EXT4-fs error (device loop0): ext4_map_blocks:596: inode #2: block 2: comm syz-executor592: lblock 0 mapped to illegal pblock 2 (length 1)
Kernel panic - not syncing: EXT4-fs (device loop0): panic forced after error
CPU: 1 PID: 421 Comm: syz-executor592 Not tainted 5.15.78-syzkaller-00911-gc73b4619ad86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 dump_stack+0x15/0x17 lib/dump_stack.c:113
 panic+0x258/0x727 kernel/panic.c:232
 ext4_handle_error+0x772/0x780 fs/ext4/super.c:667
 __ext4_error_inode+0x236/0x4d0 fs/ext4/super.c:786
 ext4_map_blocks+0x1214/0x1e20
 ext4_getblk+0x19c/0x6f0 fs/ext4/inode.c:851
 ext4_bread+0x2f/0x180 fs/ext4/inode.c:904
 __ext4_read_dirblock+0xd7/0x8d0 fs/ext4/namei.c:144
 dx_probe+0xcd/0x15a0 fs/ext4/namei.c:818
 ext4_dx_find_entry fs/ext4/namei.c:1771 [inline]
 __ext4_find_entry+0x571/0x1b90 fs/ext4/namei.c:1616
 ext4_lookup_entry fs/ext4/namei.c:1752 [inline]
 ext4_lookup+0x3de/0xb20 fs/ext4/namei.c:1820
 __lookup_slow+0x2b3/0x400 fs/namei.c:1659
 lookup_slow fs/namei.c:1676 [inline]
 lookup_one_unlocked+0x452/0x690 fs/namei.c:2749
 lookup_one_positive_unlocked fs/namei.c:2778 [inline]
 lookup_positive_unlocked+0x2c/0xb0 fs/namei.c:2818
 dquot_quota_on_mount+0x5a/0xe0 fs/quota/dquot.c:2505
 ext4_quota_on_mount fs/ext4/orphan.c:316 [inline]
 ext4_orphan_cleanup+0x56b/0x10b0 fs/ext4/orphan.c:444
 ext4_fill_super+0x8cde/0x9650 fs/ext4/super.c:4961
 mount_bdev+0x280/0x3b0 fs/super.c:1369
 ext4_mount+0x34/0x40 fs/ext4/super.c:6540
 legacy_get_tree+0xf0/0x190 fs/fs_context.c:610
 vfs_get_tree+0x88/0x290 fs/super.c:1499
 do_new_mount+0x289/0xad0 fs/namespace.c:2994
 path_mount+0x60b/0x1050 fs/namespace.c:3324
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x2d2/0x3c0 fs/namespace.c:3522
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6fe3ac1bca
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe72713208 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f6fe3ac1bca
RDX: 0000000020000440 RSI: 0000000020000480 RDI: 00007ffe72713220
RBP: 00007ffe72713220 R08: 00007ffe72713260 R09: 0000000000000474
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00005555574b92c0 R14: 0000000000000000 R15: 00007ffe72713260
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..