EXT4-fs error (device loop5): ext4_map_blocks:601: inode #12: block 80: comm syz-executor.5: lblock 0 mapped to illegal pblock 80 (length 1) ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:3355! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 19048 Comm: syz-executor.5 Not tainted 5.15.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:ext4_get_group_info+0x399/0x3a0 fs/ext4/ext4.h:3355 Code: 61 ff 8b 74 24 04 48 c7 c7 e0 6a a8 8c 4c 89 f2 e8 8c bf 0f 02 43 80 3c 2c 00 0f 85 23 fd ff ff e9 26 fd ff ff e8 67 7c 61 ff <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00 RSP: 0018:ffffc900037bf6e0 EFLAGS: 00010293 RAX: ffffffff821efe19 RBX: 00000000ffffe428 RCX: ffff88802468ba00 RDX: 0000000000000000 RSI: 00000000ffffe428 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff821efae9 R09: ffffed1005429c2c R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110082518cf R13: dffffc0000000000 R14: ffff88802c01c000 R15: ffff88804128c678 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe659971b8 CR3: 0000000078b11000 CR4: 00000000003506f0 Call Trace: ext4_mb_load_buddy_gfp+0xc7/0x1500 fs/ext4/mballoc.c:1498 ext4_discard_preallocations+0x923/0x10c0 fs/ext4/mballoc.c:5033 ext4_release_file+0x16d/0x300 fs/ext4/file.c:149 __fput+0x3bf/0x890 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:872 do_group_exit+0x144/0x310 kernel/exit.c:994 get_signal+0xc66/0x14e0 kernel/signal.c:2889 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x5d/0x2b0 kernel/entry/common.c:300 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f7669a5e0f9 Code: Unable to access opcode bytes at RIP 0x7f7669a5e0cf. RSP: 002b:00007f765fcaf218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f7669b7e058 RCX: 00007f7669a5e0f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7669b7e058 RBP: 00007f7669b7e050 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7669b7e05c R13: 00007ffccf4e8eaf R14: 00007f765fcaf300 R15: 0000000000022000 Modules linked in: ---[ end trace 28d27a7649a513a4 ]--- RIP: 0010:ext4_get_group_info+0x399/0x3a0 fs/ext4/ext4.h:3355 Code: 61 ff 8b 74 24 04 48 c7 c7 e0 6a a8 8c 4c 89 f2 e8 8c bf 0f 02 43 80 3c 2c 00 0f 85 23 fd ff ff e9 26 fd ff ff e8 67 7c 61 ff <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00 RSP: 0018:ffffc900037bf6e0 EFLAGS: 00010293 RAX: ffffffff821efe19 RBX: 00000000ffffe428 RCX: ffff88802468ba00 RDX: 0000000000000000 RSI: 00000000ffffe428 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff821efae9 R09: ffffed1005429c2c R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff110082518cf R13: dffffc0000000000 R14: ffff88802c01c000 R15: ffff88804128c678 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f068385e2d8 CR3: 00000000759aa000 CR4: 00000000003506f0