Hello, syzbot found the following issue on: HEAD commit: 88b06399 Merge tag 'for-5.13-rc1-part2-tag' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11aa7a65d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=807beec6b4d66bf1 dashboard link: https://syzkaller.appspot.com/bug?extid=a84b8783366ecb1c65d0 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a031b3d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12fc54fdd00000 The issue was bisected to: commit ea6a693d862d4f0edd748a1fa3fc6faf2c39afb2 Author: Jens Axboe <axboe@xxxxxxxxx> Date: Thu Apr 15 15:47:13 2021 +0000 io_uring: disable multishot poll for double poll add cases bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=104b5795d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=124b5795d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=144b5795d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a84b8783366ecb1c65d0@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: ea6a693d862d ("io_uring: disable multishot poll for double poll add cases") BUG: unable to handle page fault for address: ffffffffc1defce0 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD bc8f067 P4D bc8f067 PUD bc91067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8479 Comm: iou-wrk-8440 Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0xffffffffc1defce0 Code: Unable to access opcode bytes at RIP 0xffffffffc1defcb6. RSP: 0018:ffffc9000161f8f8 EFLAGS: 00010246 RAX: ffffffffc1defce0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880187eb8c0 RBP: ffff8880187eb8c0 R08: 0000000000000000 R09: 0000000000002000 R10: ffffffff81df1723 R11: 0000000000004000 R12: 0000000000000000 R13: ffff8880187eb918 R14: ffff8880187eb900 R15: ffffffffc1defce0 FS: 0000000001212300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffc1defcb6 CR3: 00000000139d9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Modules linked in: CR2: ffffffffc1defce0 ---[ end trace a41da77ef833bc79 ]--- RIP: 0010:0xffffffffc1defce0 Code: Unable to access opcode bytes at RIP 0xffffffffc1defcb6. RSP: 0018:ffffc9000161f8f8 EFLAGS: 00010246 RAX: ffffffffc1defce0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880187eb8c0 RBP: ffff8880187eb8c0 R08: 0000000000000000 R09: 0000000000002000 R10: ffffffff81df1723 R11: 0000000000004000 R12: 0000000000000000 R13: ffff8880187eb918 R14: ffff8880187eb900 R15: ffffffffc1defce0 FS: 0000000001212300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffc1defcb6 CR3: 00000000139d9000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
