Messages in this thread | | | From | Dmitry Vyukov <> | Date | Wed, 27 Jan 2021 18:00:30 +0100 | Subject | Re: WARNING in __do_kernel_fault |
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On Wed, Jan 27, 2021 at 5:56 PM syzbot <syzbot+45b6fce29ff97069e2c5@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 2ab38c17 mailmap: remove the "repo-abbrev" comment > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=15a25264d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ad43be24faf1194c > dashboard link: https://syzkaller.appspot.com/bug?extid=45b6fce29ff97069e2c5 > userspace arch: arm64 > > 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+45b6fce29ff97069e2c5@syzkaller.appspotmail.com
This happens on arm64 instance with mte enabled. There is a GPF in reiserfs_xattr_init on x86_64 reported: https://syzkaller.appspot.com/bug?id=8abaedbdeb32c861dc5340544284167dd0e46cde so I would assume it's just a plain NULL deref. Is this WARNING not indicative of a kernel bug? Or there is something special about this particular NULL deref?
> REISERFS (device loop0): Using rupasov hash to sort names > ------------[ cut here ]------------ > Ignoring spurious kernel translation fault at virtual address 0000000000000030 > WARNING: CPU: 1 PID: 5380 at arch/arm64/mm/fault.c:364 __do_kernel_fault+0x198/0x1c0 arch/arm64/mm/fault.c:364 > Modules linked in: > CPU: 1 PID: 5380 Comm: syz-executor.0 Not tainted 5.11.0-rc5-syzkaller-00037-g2ab38c17aac1 #0 > Hardware name: linux,dummy-virt (DT) > pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--) > pc : __do_kernel_fault+0x198/0x1c0 arch/arm64/mm/fault.c:364 > lr : __do_kernel_fault+0x198/0x1c0 arch/arm64/mm/fault.c:364 > sp : ffff800014933830 > x29: ffff800014933830 x28: f1ff00000c28bc00 > x27: ffff80001231db80 x26: f0ff00002054a0b8 > x25: 0000000000000000 x24: f1ff000004217680 > x23: 0000000097c78006 x22: 0000000000000030 > x21: 0000000000000025 x20: ffff800014933960 > x19: 0000000097c78006 x18: 00000000fffffffb > x17: 0000000000000000 x16: 0000000000000000 > x15: 0000000000000020 x14: 6c656e72656b2073 > x13: 00000000000006f9 x12: ffff8000149334e0 > x11: ffff80001313b450 x10: 00000000ffffe000 > x9 : ffff80001313b450 x8 : ffff80001308b450 > x7 : ffff80001313b450 x6 : 0000000000000000 > x5 : ffff00007fbe1948 x4 : 0000000000015ff5 > x3 : 0000000000000001 x2 : 0000000000000000 > x1 : 0000000000000000 x0 : f1ff00000c28bc00 > Call trace: > __do_kernel_fault+0x198/0x1c0 arch/arm64/mm/fault.c:364 > do_page_fault+0x1c0/0x3a0 arch/arm64/mm/fault.c:649 > do_translation_fault+0xb4/0xc4 arch/arm64/mm/fault.c:660 > do_mem_abort+0x44/0xbc arch/arm64/mm/fault.c:793 > el1_abort+0x40/0x6c arch/arm64/kernel/entry-common.c:118 > el1_sync_handler+0xb0/0xcc arch/arm64/kernel/entry-common.c:209 > el1_sync+0x70/0x100 arch/arm64/kernel/entry.S:656 > reiserfs_xattr_jcreate_nblocks fs/reiserfs/xattr.h:79 [inline] > reiserfs_security_init+0x98/0x10c fs/reiserfs/xattr_security.c:70 > reiserfs_mkdir+0xf4/0x320 fs/reiserfs/namei.c:821 > xattr_mkdir.constprop.0+0x24/0x3c fs/reiserfs/xattr.c:76 > create_privroot fs/reiserfs/xattr.c:889 [inline] > reiserfs_xattr_init+0x16c/0x320 fs/reiserfs/xattr.c:1011 > reiserfs_fill_super+0xa34/0xd20 fs/reiserfs/super.c:2177 > mount_bdev+0x1c4/0x1f0 fs/super.c:1366 > get_super_block+0x1c/0x30 fs/reiserfs/super.c:2606 > legacy_get_tree+0x34/0x64 fs/fs_context.c:592 > vfs_get_tree+0x2c/0xf0 fs/super.c:1496 > do_new_mount fs/namespace.c:2881 [inline] > path_mount+0x3e8/0xaf0 fs/namespace.c:3211 > do_mount fs/namespace.c:3224 [inline] > __do_sys_mount fs/namespace.c:3432 [inline] > __se_sys_mount fs/namespace.c:3409 [inline] > __arm64_sys_mount+0x1a8/0x2fc fs/namespace.c:3409 > __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] > invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] > el0_svc_common.constprop.0+0x74/0x190 arch/arm64/kernel/syscall.c:159 > do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:198 > el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365 > el0_sync_handler+0x1a8/0x1b0 arch/arm64/kernel/entry-common.c:381 > el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699 > > > --- > 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. > > -- > 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@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000009bbb7905b9e4a624%40google.com.
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