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Message-ID: <68e7eca6.050a0220.1186a4.0002.GAE@google.com> Date: Thu, 09 Oct 2025 10:11:02 -0700 From: syzbot <syzbot+b9e83021d9c642a33d8c@...kaller.appspotmail.com> To: axboe@...nel.dk, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [io-uring?] KASAN: slab-use-after-free Read in io_waitid_wait Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in add_wait_queue Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 3 UID: 0 PID: 6397 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc900027579b0 EFLAGS: 00010086 RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8b54cf9a RDI: dffffc0000000003 RBP: 0000000000000018 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff905ff0d7 R11: 0000000000000000 R12: ffffffff8b54cf9a R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe7bc5c86c0(0000) GS:ffff8880d7161000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe7bb9e5fac CR3: 00000000504de000 CR4: 0000000000352ef0 Call Trace: <TASK> __kasan_check_byte+0x13/0x50 mm/kasan/common.c:579 kasan_check_byte include/linux/kasan.h:401 [inline] lock_acquire kernel/locking/lockdep.c:5842 [inline] lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 add_wait_queue+0x45/0x230 kernel/sched/wait.c:23 io_waitid_cb+0x1c3/0x2b0 io_uring/waitid.c:219 io_handle_tw_list+0x486/0x500 io_uring/io_uring.c:1151 tctx_task_work_run+0xac/0x380 io_uring/io_uring.c:1216 tctx_task_work+0x7a/0xd0 io_uring/io_uring.c:1234 task_work_run+0x150/0x240 kernel/task_work.c:227 get_signal+0x1d0/0x26d0 kernel/signal.c:2807 arch_do_signal_or_restart+0x8f/0x7c0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x85/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x419/0x4e0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe7bb78eec9 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:00007fe7bc5c80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007fe7bb9e5fa8 RCX: 00007fe7bb78eec9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe7bb9e5fa8 RBP: 00007fe7bb9e5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe7bb9e6038 R14: 00007ffcd14563d0 R15: 00007ffcd14564b8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc900027579b0 EFLAGS: 00010086 RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8b54cf9a RDI: dffffc0000000003 RBP: 0000000000000018 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff905ff0d7 R11: 0000000000000000 R12: ffffffff8b54cf9a R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe7bc5c86c0(0000) GS:ffff8880d7161000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe7bb9e5fac CR3: 00000000504de000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 0f 1f 00 nopl (%rax) 5: 90 nop 6: 90 nop 7: 90 nop 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: 66 0f 1f 00 nopw (%rax) 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 c1 ef 03 shr $0x3,%rdi 27: 48 01 c7 add %rax,%rdi * 2a: 0f b6 07 movzbl (%rdi),%eax <-- trapping instruction 2d: 3c 07 cmp $0x7,%al 2f: 0f 96 c0 setbe %al 32: c3 ret 33: cc int3 34: cc int3 35: cc int3 36: cc int3 37: 66 data16 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax) Tested on: commit: 299d12f3 io_uring/waitid: use io_waitid_remove_wq() co.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git syztest console output: https://syzkaller.appspot.com/x/log.txt?x=12de0dcd980000 kernel config: https://syzkaller.appspot.com/x/.config?x=6da9233e22696ba7 dashboard link: https://syzkaller.appspot.com/bug?extid=b9e83021d9c642a33d8c compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.
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