On Mon, 20 Sept 2021 at 09:36, syzbot <syzbot+afe1d3c5ccb5940c372a@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: d4d016caa4b8 alpha: move __udiv_qrnnd library function to .. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1564ae79300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=6d93fe4341f98704 > dashboard link: https://syzkaller.appspot.com/bug?extid=afe1d3c5ccb5940c372a > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+afe1d3c5ccb5940c372a@xxxxxxxxxxxxxxxxxxxxxxxxx Looking at the page description printed before the BUG in the console output, I think the root cause is in +io_uring. > io_mem_free.part.0+0xf7/0x140 fs/io_uring.c:8708 > io_mem_free fs/io_uring.c:8703 [inline] > io_ring_ctx_free fs/io_uring.c:9250 [inline] > io_ring_exit_work+0xf20/0x1980 fs/io_uring.c:9408 > process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 > worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > ------------[ cut here ]------------ > kernel BUG at mm/page_alloc.c:1073! > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.15.0-rc1-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Workqueue: mm_percpu_wq vmstat_update > RIP: 0010:__free_one_page+0xa10/0xe30 mm/page_alloc.c:1073 > Code: 43 34 85 c0 0f 84 79 f9 ff ff 48 c7 c6 80 1b 97 89 48 89 ef e8 61 dd f6 ff 0f 0b 48 c7 c6 60 1a 97 89 4c 89 ef e8 50 dd f6 ff <0f> 0b 0f 0b 48 c7 c6 c0 1a 97 89 4c 89 ef e8 3d dd f6 ff 0f 0b 48 > RSP: 0018:ffffc90000ca7968 EFLAGS: 00010093 > RAX: 0000000000000000 RBX: ffffc90000ca7a60 RCX: 0000000000000000 > RDX: ffff888010e40000 RSI: ffffffff81b2f6b0 RDI: 0000000000000003 > RBP: 0000000000152200 R08: 0000000000000018 R09: 00000000ffffffff > R10: ffffffff88f44b19 R11: 00000000ffffffff R12: 0000000000000009 > R13: ffffea0005488000 R14: 0000000000000000 R15: ffff88823fff8e00 > FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000000 CR3: 0000000036db1000 CR4: 00000000001526f0 > Call Trace: > free_pcppages_bulk+0x533/0x8a0 mm/page_alloc.c:1537 > drain_zone_pages+0x173/0x440 mm/page_alloc.c:3079 > refresh_cpu_vm_stats+0x355/0x5d0 mm/vmstat.c:874 > vmstat_update+0xe/0xa0 mm/vmstat.c:1910 > process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 > worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Modules linked in: > ---[ end trace e038b7c668ec2f59 ]--- > RIP: 0010:__free_one_page+0xa10/0xe30 mm/page_alloc.c:1073 > Code: 43 34 85 c0 0f 84 79 f9 ff ff 48 c7 c6 80 1b 97 89 48 89 ef e8 61 dd f6 ff 0f 0b 48 c7 c6 60 1a 97 89 4c 89 ef e8 50 dd f6 ff <0f> 0b 0f 0b 48 c7 c6 c0 1a 97 89 4c 89 ef e8 3d dd f6 ff 0f 0b 48 > RSP: 0018:ffffc90000ca7968 EFLAGS: 00010093 > RAX: 0000000000000000 RBX: ffffc90000ca7a60 RCX: 0000000000000000 > RDX: ffff888010e40000 RSI: ffffffff81b2f6b0 RDI: 0000000000000003 > RBP: 0000000000152200 R08: 0000000000000018 R09: 00000000ffffffff > R10: ffffffff88f44b19 R11: 00000000ffffffff R12: 0000000000000009 > R13: ffffea0005488000 R14: 0000000000000000 R15: ffff88823fff8e00 > FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000000 CR3: 0000000036db1000 CR4: 00000000001526f0 > > > --- > 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. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/00000000000020104105cc685624%40google.com.
