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Thu, 02 Sep 2021 11:28:06 -0700 (PDT) Date: Thu, 02 Sep 2021 11:28:06 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001ae8cc05cb075852@google.com> Subject: Re: [syzbot] general protection fault in io_issue_sqe From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, haoxu@linux.alibaba.com, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in io_ring_ctx_wait_and_kill general protection fault, probably for non-canonical address 0xdffffc0000000016: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7] CPU: 0 PID: 10163 Comm: syz-executor.2 Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_ring_ctx_wait_and_kill+0x24d/0x450 fs/io_uring.c:9180 Code: ff 48 89 df e8 c4 fb ff ff e8 6f a8 94 ff 48 8b 04 24 48 8d b8 b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d3 01 00 00 48 8b 04 24 48 8b a8 b0 00 00 00 48 RSP: 0018:ffffc9000a8b7a60 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888046aa6000 RCX: 0000000000000000 RDX: 0000000000000016 RSI: ffffffff81e10061 RDI: 00000000000000b0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888046aa6643 R10: ffffffff81e1004b R11: 0000000000000000 R12: ffff888046aa63f8 R13: ffffc9000a8b7a90 R14: ffff8881453f4000 R15: ffff888046aa6040 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561b3ede9400 CR3: 000000000b68e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_uring_release+0x3e/0x50 fs/io_uring.c:9198 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xbae/0x2a30 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2808 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: Unable to access opcode bytes at RIP 0x4665cf. RSP: 002b:00007faa595bc218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056c040 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056c040 RBP: 000000000056c038 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c044 R13: 00007fff98399dff R14: 00007faa595bc300 R15: 0000000000022000 Modules linked in: ---[ end trace 641488e48828d1de ]--- RIP: 0010:io_ring_ctx_wait_and_kill+0x24d/0x450 fs/io_uring.c:9180 Code: ff 48 89 df e8 c4 fb ff ff e8 6f a8 94 ff 48 8b 04 24 48 8d b8 b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d3 01 00 00 48 8b 04 24 48 8b a8 b0 00 00 00 48 RSP: 0018:ffffc9000a8b7a60 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888046aa6000 RCX: 0000000000000000 RDX: 0000000000000016 RSI: ffffffff81e10061 RDI: 00000000000000b0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888046aa6643 R10: ffffffff81e1004b R11: 0000000000000000 R12: ffff888046aa63f8 R13: ffffc9000a8b7a90 R14: ffff8881453f4000 R15: ffff888046aa6040 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561b3ede9400 CR3: 000000003cbf0000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 89 df mov %rbx,%rdi 3: e8 c4 fb ff ff callq 0xfffffbcc 8: e8 6f a8 94 ff callq 0xff94a87c d: 48 8b 04 24 mov (%rsp),%rax 11: 48 8d b8 b0 00 00 00 lea 0xb0(%rax),%rdi 18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1f: fc ff df 22: 48 89 fa mov %rdi,%rdx 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2d: 0f 85 d3 01 00 00 jne 0x206 33: 48 8b 04 24 mov (%rsp),%rax 37: 48 8b a8 b0 00 00 00 mov 0xb0(%rax),%rbp 3e: 48 rex.W Tested on: commit: f85aaf32 io_uring: trigger worker exit when ring is ex.. git tree: git://git.kernel.dk/linux-block for-5.15/io_uring console output: https://syzkaller.appspot.com/x/log.txt?x=12c280a3300000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa8e68781da309a dashboard link: https://syzkaller.appspot.com/bug?extid=de67aa0cf1053e405871 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1