Hello, syzbot found the following issue on: HEAD commit: d61a00525464 Add linux-next specific files for 20241011 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1688fb27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=8554528c7f4bf3fb dashboard link: https://syzkaller.appspot.com/bug?extid=aaf95b6e8fc9d906d8a7 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10d5705f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1188fb27980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f615720e9964/disk-d61a0052.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c4a45c7583c6/vmlinux-d61a0052.xz kernel image: https://storage.googleapis.com/syzbot-assets/d767ab86d0d0/bzImage-d61a0052.xz The issue was bisected to: commit 181d71062eef699385d92b92f8ad3cbf03e61267 Author: Amir Goldstein <amir73il@xxxxxxxxx> Date: Mon Oct 7 13:22:29 2024 +0000 ovl: allocate a container struct ovl_file for ovl private context bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11c41440580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13c41440580000 console output: https://syzkaller.appspot.com/x/log.txt?x=15c41440580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+aaf95b6e8fc9d906d8a7@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 181d71062eef ("ovl: allocate a container struct ovl_file for ovl private context") Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 UID: 0 PID: 5235 Comm: syz-executor410 Not tainted 6.12.0-rc2-next-20241011-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:file_inode include/linux/fs.h:1124 [inline] RIP: 0010:ovl_is_real_file fs/overlayfs/file.c:100 [inline] RIP: 0010:ovl_real_file_path+0xa5/0x2e0 fs/overlayfs/file.c:118 Code: 03 4d 89 f7 42 80 3c 30 00 74 08 4c 89 ef e8 22 1e e0 fe 4c 89 64 24 10 49 8b 45 00 49 89 c4 4c 8d 70 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 fc 1d e0 fe 49 8b 1e 48 83 c5 68 RSP: 0018:ffffc90002dcfb28 EFLAGS: 00010202 RAX: 000000000000000d RBX: 1ffff920005b9f79 RCX: ffff88801efa5a00 RDX: 0000000000000000 RSI: ffffc90002dcfbc0 RDI: ffff888031c9bc00 RBP: ffff88807eb938f8 R08: ffffffff831d82d9 R09: 0000000000000000 R10: ffffc90002dcfae0 R11: fffff520005b9f5e R12: 0000000000000000 R13: ffff888078c80000 R14: 0000000000000068 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001740 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ovl_real_file+0x186/0x210 fs/overlayfs/file.c:176 ovl_flush+0x22/0x140 fs/overlayfs/file.c:620 filp_flush+0xb7/0x160 fs/open.c:1527 filp_close+0x1e/0x40 fs/open.c:1540 close_files fs/file.c:508 [inline] put_files_struct+0x198/0x310 fs/file.c:523 do_exit+0xa10/0x28e0 kernel/exit.c:933 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbb4c5e7739 Code: Unable to access opcode bytes at 0x7fbb4c5e770f. RSP: 002b:00007fff9c70aac8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbb4c5e7739 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fbb4c662290 R08: ffffffffffffffb8 R09: 00007fbb4c5b5e50 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbb4c662290 R13: 0000000000000000 R14: 00007fbb4c662ce0 R15: 00007fbb4c5b62a0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:file_inode include/linux/fs.h:1124 [inline] RIP: 0010:ovl_is_real_file fs/overlayfs/file.c:100 [inline] RIP: 0010:ovl_real_file_path+0xa5/0x2e0 fs/overlayfs/file.c:118 Code: 03 4d 89 f7 42 80 3c 30 00 74 08 4c 89 ef e8 22 1e e0 fe 4c 89 64 24 10 49 8b 45 00 49 89 c4 4c 8d 70 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 fc 1d e0 fe 49 8b 1e 48 83 c5 68 RSP: 0018:ffffc90002dcfb28 EFLAGS: 00010202 RAX: 000000000000000d RBX: 1ffff920005b9f79 RCX: ffff88801efa5a00 RDX: 0000000000000000 RSI: ffffc90002dcfbc0 RDI: ffff888031c9bc00 RBP: ffff88807eb938f8 R08: ffffffff831d82d9 R09: 0000000000000000 R10: ffffc90002dcfae0 R11: fffff520005b9f5e R12: 0000000000000000 R13: ffff888078c80000 R14: 0000000000000068 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001740 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 4d 89 add -0x77(%rbp),%ecx 3: f7 42 80 3c 30 00 74 testl $0x7400303c,-0x80(%rdx) a: 08 4c 89 ef or %cl,-0x11(%rcx,%rcx,4) e: e8 22 1e e0 fe call 0xfee01e35 13: 4c 89 64 24 10 mov %r12,0x10(%rsp) 18: 49 8b 45 00 mov 0x0(%r13),%rax 1c: 49 89 c4 mov %rax,%r12 1f: 4c 8d 70 68 lea 0x68(%rax),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 fc 1d e0 fe call 0xfee01e35 39: 49 8b 1e mov (%r14),%rbx 3c: 48 83 c5 68 add $0x68,%rbp --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, 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 overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
