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https://syzkaller.appspot.com/bug?extid=ca15a081ac6b8357d82c compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c9d5d4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ef27ce1c74bb/disk-46637478.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2962783b1956/vmlinux-46637478.xz kernel image: https://storage.googleapis.com/syzbot-assets/faa841f27097/bzImage-46637478.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca15a081ac6b8357d82c@syzkaller.appspotmail.com RBP: 00007ff5f3810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff5f39b5fa0 R15: 00007ffd192cb478 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6071 at kernel/fork.c:731 __put_task_struct+0x340/0x530 kernel/fork.c:731 Modules linked in: CPU: 1 UID: 0 PID: 6071 Comm: syz.2.22 Not tainted 6.16.0-rc2-syzkaller-00045-g4663747812d1 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__put_task_struct+0x340/0x530 kernel/fork.c:731 Code: f6 ac 41 00 be 03 00 00 00 4c 89 e7 e8 f9 c2 5e 03 e9 ed fe ff ff e8 df ac 41 00 90 0f 0b 90 e9 6d fd ff ff e8 d1 ac 41 00 90 <0f> 0b 90 e9 0b fd ff ff e8 c3 ac 41 00 90 0f 0b 90 e9 67 fd ff ff RSP: 0018:ffffc90002fd7c50 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888026d18000 RCX: ffffffff8179d88b RDX: ffff888032081e00 RSI: ffffffff8179db7f RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888026d18000 R13: 1ffff920005faf96 R14: ffff888026d18028 R15: 0000000000000000 FS: 00007ff5f452f6c0(0000) GS:ffff888124861000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff5f3725b20 CR3: 0000000073166000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: put_task_struct include/linux/sched/task.h:145 [inline] put_task_struct include/linux/sched/task.h:132 [inline] io_sq_offload_create+0xe4b/0x1330 io_uring/sqpoll.c:517 io_uring_create io_uring/io_uring.c:3747 [inline] io_uring_setup+0x1493/0x2080 io_uring/io_uring.c:3830 __do_sys_io_uring_setup io_uring/io_uring.c:3864 [inline] __se_sys_io_uring_setup io_uring/io_uring.c:3855 [inline] __x64_sys_io_uring_setup+0xc2/0x170 io_uring/io_uring.c:3855 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5f378e929 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:00007ff5f452f038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007ff5f39b5fa0 RCX: 00007ff5f378e929 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000059 RBP: 00007ff5f3810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff5f39b5fa0 R15: 00007ffd192cb478 --- 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@googlegroups.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