Hello, syzbot found the following issue on: HEAD commit: 6995e2de6891 Linux 6.4 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=175bc8bf280000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4df35260418daa6 dashboard link: https://syzkaller.appspot.com/bug?extid=b960a0fea3fa8df1cd22 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e661af280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1f2e8d4aac75/disk-6995e2de.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/db793abf1e91/vmlinux-6995e2de.xz kernel image: https://storage.googleapis.com/syzbot-assets/60215f5bf9ff/bzImage-6995e2de.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/428a4f7e064c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b960a0fea3fa8df1cd22@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] CPU: 0 PID: 6808 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:i_size_read include/linux/fs.h:883 [inline] RIP: 0010:ext4_quota_read+0xd5/0x330 fs/ext4/super.c:7107 Code: ff 41 80 fc 3f 0f 87 00 11 cd 07 e8 05 93 49 ff 48 8b 44 24 08 48 8d 78 50 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 0d 02 00 00 48 8b 44 24 08 4c 89 ef 45 31 ff 48 RSP: 0018:ffffc9000c17f420 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000000a RSI: ffffffff823ab65b RDI: 0000000000000050 RBP: 0000000000000001 R08: 0000000000000001 R09: 000000000000003f R10: 000000000000000c R11: 0000000000094001 R12: 000000000000000c R13: 0000000000000400 R14: ffff888021014800 R15: ffff888028e6fc00 FS: 00007f94b3a7f700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5437a8000 CR3: 000000002826f000 CR4: 0000000000350ef0 Call Trace: <TASK> do_insert_tree+0x117/0x12d0 fs/quota/quota_tree.c:347 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b4/0x570 fs/quota/quota_tree.c:420 v2_write_dquot+0x120/0x250 fs/quota/quota_v2.c:358 dquot_acquire+0x3d1/0x6c0 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6814 dqget+0x67d/0x1080 fs/quota/dquot.c:914 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 dquot_initialize fs/quota/dquot.c:1550 [inline] dquot_file_open fs/quota/dquot.c:2181 [inline] dquot_file_open+0x90/0xb0 fs/quota/dquot.c:2175 ext4_file_open fs/ext4/file.c:904 [inline] ext4_file_open+0x35d/0xbf0 fs/ext4/file.c:873 do_dentry_open+0x6cc/0x13f0 fs/open.c:920 do_open fs/namei.c:3636 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3791 do_filp_open+0x1ba/0x410 fs/namei.c:3818 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1383 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f94b2c8c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f94b3a7f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f94b2dabf80 RCX: 00007f94b2c8c389 RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007f94b2cd7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff112e5fcf R14: 00007f94b3a7f300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:i_size_read include/linux/fs.h:883 [inline] RIP: 0010:ext4_quota_read+0xd5/0x330 fs/ext4/super.c:7107 Code: ff 41 80 fc 3f 0f 87 00 11 cd 07 e8 05 93 49 ff 48 8b 44 24 08 48 8d 78 50 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 0d 02 00 00 48 8b 44 24 08 4c 89 ef 45 31 ff 48 RSP: 0018:ffffc9000c17f420 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000000a RSI: ffffffff823ab65b RDI: 0000000000000050 RBP: 0000000000000001 R08: 0000000000000001 R09: 000000000000003f R10: 000000000000000c R11: 0000000000094001 R12: 000000000000000c R13: 0000000000000400 R14: ffff888021014800 R15: ffff888028e6fc00 FS: 00007f94b3a7f700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f5d63e000 CR3: 000000002826f000 CR4: 0000000000350ee0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 41 80 fc 3f cmp $0x3f,%r12b 4: 0f 87 00 11 cd 07 ja 0x7cd110a a: e8 05 93 49 ff callq 0xff499314 f: 48 8b 44 24 08 mov 0x8(%rsp),%rax 14: 48 8d 78 50 lea 0x50(%rax),%rdi 18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1f: fc ff df 22: 48 89 fa mov %rdi,%rdx 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2d: 0f 85 0d 02 00 00 jne 0x240 33: 48 8b 44 24 08 mov 0x8(%rsp),%rax 38: 4c 89 ef mov %r13,%rdi 3b: 45 31 ff xor %r15d,%r15d 3e: 48 rex.W --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
