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Date:   Wed, 28 Dec 2022 12:16:41 -0800
From:   syzbot <>
Subject: [syzbot] [ext4?] kernel panic: EXT4-fs (device loop0): panic forced
 after error (2)


syzbot found the following issue on:

HEAD commit:    72a85e2b0a1e Merge tag 'spi-fix-v6.2-rc1' of git://git.ker..
git tree:       upstream
kernel config:
dashboard link:
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:
C reproducer:

Downloadable assets:
disk image:
kernel image:
mounted in repro:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

loop0: detected capacity change from 0 to 512
EXT4-fs error (device loop0): ext4_map_blocks:607: inode #2: block 2: comm syz-executor170: lblock 0 mapped to illegal pblock 2 (length 1)
Kernel panic - not syncing: EXT4-fs (device loop0): panic forced after error
CPU: 1 PID: 5069 Comm: syz-executor170 Not tainted 6.1.0-syzkaller-14594-g72a85e2b0a1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
 panic+0x2d6/0x710 kernel/panic.c:318
 ext4_handle_error+0x848/0x8a0 fs/ext4/super.c:685
 __ext4_error_inode+0x2e1/0x4c0 fs/ext4/super.c:808
 ext4_getblk+0x1b9/0x770 fs/ext4/inode.c:864
 ext4_bread+0x2a/0x170 fs/ext4/inode.c:920
 __ext4_read_dirblock+0xc9/0x890 fs/ext4/namei.c:144
 dx_probe+0xb7/0x1590 fs/ext4/namei.c:818
 ext4_dx_find_entry fs/ext4/namei.c:1771 [inline]
 __ext4_find_entry+0x599/0x1ba0 fs/ext4/namei.c:1616
 ext4_lookup_entry fs/ext4/namei.c:1752 [inline]
 ext4_lookup+0x11c/0x690 fs/ext4/namei.c:1820
 __lookup_slow+0x266/0x3a0 fs/namei.c:1685
 lookup_slow fs/namei.c:1702 [inline]
 lookup_one_unlocked+0x3f8/0x670 fs/namei.c:2772
 lookup_one_positive_unlocked fs/namei.c:2801 [inline]
 lookup_positive_unlocked+0x27/0xb0 fs/namei.c:2841
 dquot_quota_on_mount+0x56/0xe0 fs/quota/dquot.c:2514
 ext4_quota_on_mount fs/ext4/orphan.c:316 [inline]
 ext4_orphan_cleanup+0x687/0x1340 fs/ext4/orphan.c:444
 __ext4_fill_super fs/ext4/super.c:5516 [inline]
 ext4_fill_super+0x81cd/0x8700 fs/ext4/super.c:5644
 get_tree_bdev+0x400/0x620 fs/super.c:1282
 vfs_get_tree+0x88/0x270 fs/super.c:1489
 do_new_mount+0x289/0xad0 fs/namespace.c:3145
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
RIP: 0033:0x7fd5f592fbca
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:00007ffcfa196b78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fd5f592fbca
RDX: 0000000020000440 RSI: 0000000020000480 RDI: 00007ffcfa196b90
RBP: 00007ffcfa196b90 R08: 00007ffcfa196bd0 R09: 0000000000000474
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00005555565362c0 R14: 0000000000000000 R15: 00007ffcfa196bd0
Kernel Offset: disabled
Rebooting in 86400 seconds..

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