linux-kernel - 5.8-rc*: kernel BUG at kernel/signal.c:1917

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Date:   Fri, 17 Jul 2020 12:45:54 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Oleg Nesterov <oleg@...hat.com>, christian@...uner.io,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: 5.8-rc*: kernel BUG at kernel/signal.c:1917

Hi,

the strace testsuite triggers this on 5.8-rc4 and -rc5 both on x86_64
and i586:
> kernel BUG at kernel/signal.c:1917!
> invalid opcode: 0000 [#1] SMP NOPTI 
> CPU: 7 PID: 18367 Comm: filter-unavaila Not tainted 5.8.0-rc4-3.g2cd7849-default #1 openSUSE Tumbleweed (unreleased)
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014
> RIP: 0010:do_notify_parent+0x239/0x270 
> Code: d1 e8 41 89 c5 41 83 e5 01 48 8b 95 28 05 00 00 45 31 c0 4c 89 f6 44 89 e7 b9 01 00 00 00 e8 ce f2 ff ff e9 5b ff ff ff 0f 0b <0f> 0b 48 39 bf 50 05 00 00 75 17 48 8b 97 c0 05 00 00 48 8d 87 c0
> RSP: 0018:ffffa05400f93d00 EFLAGS: 00010002
> RAX: 0000000000000008 RBX: ffff9024ebb6dd00 RCX: 00000000000102f9
> RDX: 0000000000000000 RSI: 0000000000000011 RDI: ffff9024ebb6dd00
> RBP: ffff9024ebb6dd00 R08: 0000000000000000 R09: 000000000000000d
> R10: 00007f7813000000 R11: ffffc2690721ae80 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000009 R15: 0000000000000000
> FS:  00007f7812ffc700(0000) GS:ffff902537dc0000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f9c246a4a10 CR3: 00000001eba7c000 CR4: 00000000000406e0
> Call Trace:
>  exit_notify+0x1c0/0x1f0 
>  do_exit+0x234/0x430
>  do_group_exit+0x33/0xa0 
>  get_signal+0x171/0x640
>  do_signal+0x2a/0x1c0
>  exit_to_usermode_loop+0x89/0x110
>  __prepare_exit_to_usermode+0x92/0xd0
>  do_syscall_64+0x59/0xd0 
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x7f78149db992
> Code: Bad RIP value.
> RSP: 002b:00007f7812ffbed0 EFLAGS: 00000293 ORIG_RAX: 0000000000000022
> RAX: fffffffffffffdfe RBX: 0000000000000000 RCX: 00007f78149db992
> RDX: 0000000000000001 RSI: 0000558a4e07e033 RDI: 0000000000000000
> RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f7812ffc700
> R10: 00007f7812ffc9d0 R11: 0000000000000293 R12: 0000000000000000
> R13: 00007ffe4853b4bf R14: 00007ffe4853b4c0 R15: 00007f7812ffc700
> Modules linked in: ata_generic ata_piix qemu_fw_cfg e1000 nls_iso8859_1 nls_cp437 vfat fat virtio_blk virtio_mmio xfs btrfs blake2b_generic xor raid6_pq libcrc32c crc32c_intel reiserfs squashfs fuse dm_snapshot dm_bufio dm_crypt dm_mod binfmt_misc loop sg virtio_rng
> ---[ end trace 364c3385f192fee3 ]---

Any ideas?

thanks,
-- 
js
suse labs