Hello, syzbot found the following issue on: HEAD commit: c02d24a5af66 Add linux-next specific files for 20241003 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=111f2b9f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=94f9caf16c0af42d dashboard link: https://syzkaller.appspot.com/bug?extid=5cfa9ffce7cc5744fe24 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=114be307980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16bef527980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/641e642c9432/disk-c02d24a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/98aaf20c29e0/vmlinux-c02d24a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/c23099f2d86b/bzImage-c02d24a5.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/d12a33e3e104/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5cfa9ffce7cc5744fe24@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc00000000c7: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000638-0x000000000000063f] CPU: 1 UID: 0 PID: 116 Comm: kworker/1:2 Not tainted 6.12.0-rc1-next-20241003-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_long flush_mdb RIP: 0010:hfs_mdb_commit+0x37/0xfd0 fs/hfs/mdb.c:266 Code: 53 48 83 ec 48 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 dc 45 0a ff 48 89 5c 24 08 4c 8d a3 38 06 00 00 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 0a 2b 74 ff 4d 8b 34 24 49 8d 6e RSP: 0018:ffffc90002d0fb40 EFLAGS: 00010202 RAX: ffffffff828a89e4 RBX: 00000000000000c7 RCX: ffff88801ef68000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: ffffc90002d0fdc0 R08: ffff88802e32d1eb R09: 1ffff11005c65a3d R10: dffffc0000000000 R11: ffffed1005c65a3e R12: 0000000000000638 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000001800000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fc5eb2fb50 CR3: 00000000786e8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hfs_mdb_commit+0x37/0xfd0 fs/hfs/mdb.c:266 Code: 53 48 83 ec 48 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 dc 45 0a ff 48 89 5c 24 08 4c 8d a3 38 06 00 00 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 0a 2b 74 ff 4d 8b 34 24 49 8d 6e RSP: 0018:ffffc90002d0fb40 EFLAGS: 00010202 RAX: ffffffff828a89e4 RBX: 00000000000000c7 RCX: ffff88801ef68000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: ffffc90002d0fdc0 R08: ffff88802e32d1eb R09: 1ffff11005c65a3d R10: dffffc0000000000 R11: ffffed1005c65a3e R12: 0000000000000638 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000001800000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055fc5eb2fb50 CR3: 00000000786e8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 53 push %rbx 1: 48 83 ec 48 sub $0x48,%rsp 5: 48 89 fb mov %rdi,%rbx 8: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 f: fc ff df 12: e8 dc 45 0a ff call 0xff0a45f3 17: 48 89 5c 24 08 mov %rbx,0x8(%rsp) 1c: 4c 8d a3 38 06 00 00 lea 0x638(%rbx),%r12 23: 4c 89 e3 mov %r12,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 0a 2b 74 ff call 0xff742b43 39: 4d 8b 34 24 mov (%r12),%r14 3d: 49 rex.WB 3e: 8d .byte 0x8d 3f: 6e outsb %ds:(%rsi),(%dx) --- 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 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
