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Message-ID: <6928b121.a70a0220.d98e3.0110.GAE@google.com> Date: Thu, 27 Nov 2025 12:14:25 -0800 From: syzbot <syzbot+321168dfa622eda99689@...kaller.appspotmail.com> To: amir73il@...il.com, jack@...e.cz, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, repnop@...gle.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [fs?] general protection fault in fsnotify_destroy_group Hello, syzbot found the following issue on: HEAD commit: 92fd6e84175b Add linux-next specific files for 20251125 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13226e92580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bf77a4e0e3514deb dashboard link: https://syzkaller.appspot.com/bug?extid=321168dfa622eda99689 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f9c57c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13537612580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bee2604d495b/disk-92fd6e84.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b12aade49e2c/vmlinux-92fd6e84.xz kernel image: https://storage.googleapis.com/syzbot-assets/286fd34158cb/bzImage-92fd6e84.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+321168dfa622eda99689@...kaller.appspotmail.com RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000f00 RBP: 00007ffd8b6be440 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f09c35e5fa0 R14: 00007f09c35e5fa0 R15: 0000000000000002 </TASK> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 6016 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 01 33 09 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90003147c10 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffffff8b5a8b4e RCX: 707d8ea8101f1b00 RDX: 0000000000000000 RSI: ffffffff8b5a8b4e RDI: 0000000000000003 RBP: ffffffff824e37fd R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1c0c6f3 R12: 0000000000000000 R13: 000000000000001c R14: 000000000000001c R15: 0000000000000001 FS: 000055556de07500(0000) GS:ffff888125f8b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f09c332b5a0 CR3: 00000000750b0000 CR4: 00000000003526f0 Call Trace: <TASK> __kasan_check_byte+0x12/0x40 mm/kasan/common.c:572 kasan_check_byte include/linux/kasan.h:401 [inline] lock_acquire+0x84/0x340 kernel/locking/lockdep.c:5842 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] fsnotify_group_stop_queueing fs/notify/group.c:39 [inline] fsnotify_destroy_group+0x8d/0x320 fs/notify/group.c:58 class_fsnotify_group_destructor fs/notify/fanotify/fanotify_user.c:1600 [inline] __do_sys_fanotify_init fs/notify/fanotify/fanotify_user.c:1759 [inline] __se_sys_fanotify_init+0x991/0xbc0 fs/notify/fanotify/fanotify_user.c:1607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f09c338f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd8b6be3e8 EFLAGS: 00000246 ORIG_RAX: 000000000000012c RAX: ffffffffffffffda RBX: 00007f09c35e5fa0 RCX: 00007f09c338f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000f00 RBP: 00007ffd8b6be440 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f09c35e5fa0 R14: 00007f09c35e5fa0 R15: 0000000000000002 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 40 01 33 09 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90003147c10 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffffffff8b5a8b4e RCX: 707d8ea8101f1b00 RDX: 0000000000000000 RSI: ffffffff8b5a8b4e RDI: 0000000000000003 RBP: ffffffff824e37fd R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1c0c6f3 R12: 0000000000000000 R13: 000000000000001c R14: 000000000000001c R15: 0000000000000001 FS: 000055556de07500(0000) GS:ffff888125f8b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f09c332b5a0 CR3: 00000000750b0000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 0f 1f 40 d6 nopl -0x2a(%rax) 1c: 48 c1 ef 03 shr $0x3,%rdi 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 0f b6 04 07 movzbl (%rdi,%rax,1),%eax <-- trapping instruction 2e: 3c 08 cmp $0x8,%al 30: 0f 92 c0 setb %al 33: e9 40 01 33 09 jmp 0x9330178 38: cc int3 39: 66 data16 3a: 66 data16 3b: 66 data16 3c: 66 data16 3d: 66 data16 3e: 66 data16 3f: 2e cs --- 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@...glegroups.com. 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
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