Messages in this thread | | | Date | Sat, 6 Nov 2021 15:59:39 +0800 | Subject | Re: [syzbot] kernel BUG in trans_pgd_create_copy | From | Rongwei Wang <> |
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On 11/6/21 3:48 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: d4439a1189f9 Merge tag 'hsi-for-5.16' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12b5f782b00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8eccc5e89b1d525c > dashboard link: https://syzkaller.appspot.com/bug?extid=a0d68c9c9123000ed5ab > compiler: aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 > userspace arch: arm > > 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+a0d68c9c9123000ed5ab@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > kernel BUG at arch/arm64/include/asm/pgalloc.h:79! > Internal error: Oops - BUG: 0 [#1] SMP > Modules linked in: > CPU: 0 PID: 12093 Comm: syz-executor.1 Not tainted 5.15.0-syzkaller-10158-gd4439a1189f9 #0 > Hardware name: linux,dummy-virt (DT) > pstate: 40000005 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : pmd_populate_kernel arch/arm64/include/asm/pgalloc.h:79 [inline] > pc : copy_pte arch/arm64/mm/trans_pgd.c:70 [inline] > pc : copy_pmd arch/arm64/mm/trans_pgd.c:105 [inline] > pc : copy_pud arch/arm64/mm/trans_pgd.c:141 [inline] > pc : copy_p4d arch/arm64/mm/trans_pgd.c:167 [inline] > pc : copy_page_tables arch/arm64/mm/trans_pgd.c:186 [inline] > pc : trans_pgd_create_copy+0x5bc/0x7f0 arch/arm64/mm/trans_pgd.c:213 > lr : trans_alloc arch/arm64/mm/trans_pgd.c:30 [inline] > lr : copy_pte arch/arm64/mm/trans_pgd.c:67 [inline] > lr : copy_pmd arch/arm64/mm/trans_pgd.c:105 [inline] > lr : copy_pud arch/arm64/mm/trans_pgd.c:141 [inline] > lr : copy_p4d arch/arm64/mm/trans_pgd.c:167 [inline] > lr : copy_page_tables arch/arm64/mm/trans_pgd.c:186 [inline] > lr : trans_pgd_create_copy+0x480/0x7f0 arch/arm64/mm/trans_pgd.c:213 > sp : ffff80001b977a60 > x29: ffff80001b977a60 x28: 1fffe0000ffff000 x27: ffff800010059c90 > x26: ffff00003fffffff x25: ffff000032476000 x24: dfff800000000000 > x23: ffff000000200000 x22: ffff80001b977c30 x21: ffff000040000000 > x20: ffff00007fff8000 x19: ffff000000000000 x18: fffffbffeff9c3c8 > x17: 0000000000000000 x16: 0000000000000000 x15: d503201fd503201f > x14: 1ffff0000372ee30 x13: 0000000000000000 x12: ffff60000648f000 > x11: 1fffe0000648efff x10: ffff60000648efff x9 : 0000000000000000 > x8 : ffff000032478000 x7 : 0000000000000000 x6 : 000000000000003f > x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000004 > x2 : fffffc0000000000 x1 : ffff800015f1e560 x0 : ffff000032477000 > Call trace: > set_p4d arch/arm64/include/asm/pgtable.h:695 [inline] > __p4d_populate arch/arm64/include/asm/pgalloc.h:46 [inline] > p4d_populate arch/arm64/include/asm/pgalloc.h:54 [inline] > copy_pud arch/arm64/mm/trans_pgd.c:129 [inline] > copy_p4d arch/arm64/mm/trans_pgd.c:167 [inline] > copy_page_tables arch/arm64/mm/trans_pgd.c:186 [inline] > trans_pgd_create_copy+0x5bc/0x7f0 arch/arm64/mm/trans_pgd.c:213 > machine_kexec_post_load+0x178/0x6d0 arch/arm64/kernel/machine_kexec.c:146 > do_kexec_load+0x194/0x520 kernel/kexec.c:155 > __do_compat_sys_kexec_load kernel/kexec.c:292 [inline] > __se_compat_sys_kexec_load kernel/kexec.c:257 [inline] > __arm64_compat_sys_kexec_load+0x36c/0x47c kernel/kexec.c:257 > __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] > invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 > el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 > do_el0_svc_compat+0x40/0x80 arch/arm64/kernel/syscall.c:187 > el0_svc_compat+0x64/0x280 arch/arm64/kernel/entry-common.c:736 > el0t_32_sync_handler+0x90/0x140 arch/arm64/kernel/entry-common.c:746 > el0t_32_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:577 > Code: 17fffee0 aa1503e0 97ffdd37 17ffff17 (d4210000) > ---[ end trace a6c0112af29130b0 ]--- > > This bug seems like that I described in last week: link: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20211030183200.51295-2-rongwei.wang@linux.alibaba.com/
> --- > 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@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
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