On 5/17/21 10:22 AM, syzbot wrote: > 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: #syz test: https://github.com/isilence/linux.git syz_test10 > > 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 > -- Pavel Begunkov
