Hello, syzbot found the following issue on: HEAD commit: 453f5db0619e Merge tag 'trace-v6.7-rc7' of git://git.kerne.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10ec3829e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f8e72bae38c079e4 dashboard link: https://syzkaller.appspot.com/bug?extid=f8a023e0c6beabe2371a 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=1414af31e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e52409e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/38b92a7149e8/disk-453f5db0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4f872267133f/vmlinux-453f5db0.xz kernel image: https://storage.googleapis.com/syzbot-assets/587572061791/bzImage-453f5db0.xz The issue was bisected to: commit 7e8358edf503e87236c8d07f69ef0ed846dd5112 Author: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> Date: Fri Dec 22 00:07:57 2023 +0000 eventfs: Fix file and directory uid and gid ownership bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=108cd519e80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=128cd519e80000 console output: https://syzkaller.appspot.com/x/log.txt?x=148cd519e80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f8a023e0c6beabe2371a@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 7e8358edf503 ("eventfs: Fix file and directory uid and gid ownership") BUG: unable to handle page fault for address: fffffffffffffff0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD d734067 P4D d734067 PUD d736067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5056 Comm: syz-executor170 Not tainted 6.7.0-rc7-syzkaller-00049-g453f5db0619e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:set_gid fs/tracefs/inode.c:224 [inline] RIP: 0010:tracefs_apply_options+0x4d0/0xa40 fs/tracefs/inode.c:337 Code: 24 10 49 8b 1e 48 83 c3 f0 74 3d 48 89 d8 48 c1 e8 03 48 bd 00 00 00 00 00 fc ff df 80 3c 28 00 74 08 48 89 df e8 70 ff 88 fe <48> 8b 1b 48 89 de 48 83 e6 02 31 ff e8 bf fe 2c fe 48 83 e3 02 75 RSP: 0018:ffffc900040ffca8 EFLAGS: 00010246 RAX: 1ffffffffffffffe RBX: fffffffffffffff0 RCX: ffff888014bf5940 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc900040ffc20 RBP: dffffc0000000000 R08: 0000000000000003 R09: fffff5200081ff84 R10: dffffc0000000000 R11: fffff5200081ff84 R12: ffff88801d743888 R13: ffff88801b0c3710 R14: ffff88801d7437e8 R15: ffff88801d743810 FS: 00005555557dd480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff0 CR3: 000000001ec48000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> tracefs_remount+0x78/0x80 fs/tracefs/inode.c:353 reconfigure_super+0x440/0x870 fs/super.c:1143 do_remount fs/namespace.c:2884 [inline] path_mount+0xc24/0xfa0 fs/namespace.c:3656 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fec326e8d99 Code: 48 83 c4 28 c3 e8 67 17 00 00 0f 1f 80 00 00 00 00 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:00007ffc8103ddf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc8103de00 RCX: 00007fec326e8d99 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007ffc8103de08 R08: 0000000020000140 R09: 00007fec326b5b80 R10: 0000000002200022 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc8103e068 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: CR2: fffffffffffffff0 ---[ end trace 0000000000000000 ]--- RIP: 0010:set_gid fs/tracefs/inode.c:224 [inline] RIP: 0010:tracefs_apply_options+0x4d0/0xa40 fs/tracefs/inode.c:337 Code: 24 10 49 8b 1e 48 83 c3 f0 74 3d 48 89 d8 48 c1 e8 03 48 bd 00 00 00 00 00 fc ff df 80 3c 28 00 74 08 48 89 df e8 70 ff 88 fe <48> 8b 1b 48 89 de 48 83 e6 02 31 ff e8 bf fe 2c fe 48 83 e3 02 75 RSP: 0018:ffffc900040ffca8 EFLAGS: 00010246 RAX: 1ffffffffffffffe RBX: fffffffffffffff0 RCX: ffff888014bf5940 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc900040ffc20 RBP: dffffc0000000000 R08: 0000000000000003 R09: fffff5200081ff84 R10: dffffc0000000000 R11: fffff5200081ff84 R12: ffff88801d743888 R13: ffff88801b0c3710 R14: ffff88801d7437e8 R15: ffff88801d743810 FS: 00005555557dd480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff0 CR3: 000000001ec48000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 10 and $0x10,%al 2: 49 8b 1e mov (%r14),%rbx 5: 48 83 c3 f0 add $0xfffffffffffffff0,%rbx 9: 74 3d je 0x48 b: 48 89 d8 mov %rbx,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 19: fc ff df 1c: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 20: 74 08 je 0x2a 22: 48 89 df mov %rbx,%rdi 25: e8 70 ff 88 fe call 0xfe88ff9a * 2a: 48 8b 1b mov (%rbx),%rbx <-- trapping instruction 2d: 48 89 de mov %rbx,%rsi 30: 48 83 e6 02 and $0x2,%rsi 34: 31 ff xor %edi,%edi 36: e8 bf fe 2c fe call 0xfe2cfefa 3b: 48 83 e3 02 and $0x2,%rbx 3f: 75 .byte 0x75 --- 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
