Hello, syzbot found the following issue on: HEAD commit: c245a7a79602 Add linux-next specific files for 20241203 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=10ae840f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=af3fe1d01b9e7b7 dashboard link: https://syzkaller.appspot.com/bug?extid=092bbab7da235a02a03a 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=14a448df980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15cca330580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8cc90a2ea120/disk-c245a7a7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0f6b1a1a0541/vmlinux-c245a7a7.xz kernel image: https://storage.googleapis.com/syzbot-assets/9fa3eac09ddc/bzImage-c245a7a7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+092bbab7da235a02a03a@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: null-ptr-deref in atomic_long_sub_and_test include/linux/atomic/atomic-instrumented.h:4521 [inline] BUG: KASAN: null-ptr-deref in put_cred_many include/linux/cred.h:255 [inline] BUG: KASAN: null-ptr-deref in put_cred include/linux/cred.h:269 [inline] BUG: KASAN: null-ptr-deref in io_unregister_personality io_uring/register.c:82 [inline] BUG: KASAN: null-ptr-deref in __io_uring_register io_uring/register.c:698 [inline] BUG: KASAN: null-ptr-deref in __do_sys_io_uring_register io_uring/register.c:902 [inline] BUG: KASAN: null-ptr-deref in __se_sys_io_uring_register+0x1227/0x3b60 io_uring/register.c:879 Write of size 8 at addr 0000000000000406 by task syz-executor274/5828 CPU: 1 UID: 0 PID: 5828 Comm: syz-executor274 Not tainted 6.13.0-rc1-next-20241203-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_report+0xe8/0x550 mm/kasan/report.c:492 kasan_report+0x143/0x180 mm/kasan/report.c:602 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_long_sub_and_test include/linux/atomic/atomic-instrumented.h:4521 [inline] put_cred_many include/linux/cred.h:255 [inline] put_cred include/linux/cred.h:269 [inline] io_unregister_personality io_uring/register.c:82 [inline] __io_uring_register io_uring/register.c:698 [inline] __do_sys_io_uring_register io_uring/register.c:902 [inline] __se_sys_io_uring_register+0x1227/0x3b60 io_uring/register.c:879 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: 0033:0x7f65bbcb03a9 Code: 48 83 c4 28 c3 e8 37 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:00007ffe8fac7478 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 000000000000371d RCX: 00007f65bbcb03a9 RDX: 0000000000000000 RSI: 000000000000000a RDI: 0000000000000003 RBP: 0000000000000003 R08: 00000000000ac5f8 R09: 00000000000ac5f8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe8fac7648 R14: 0000000000000001 R15: 0000000000000001 </TASK> ================================================================== --- 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
