syzbot


linux-next boot error: general protection fault in do_mount_root

Status: fixed on 2020/02/14 01:19
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+31f37c1dc3fd9e900602@syzkaller.appspotmail.com
Fix commit: 7de7de7ca0ae Fix root mounting with no mount options
First crash: 1590d, last: 1589d
Discussions (1)
Title Replies (including bot) Last reply
linux-next boot error: general protection fault in do_mount_root 1 (2) 2019/12/16 17:20

Sample crash report:
batman_adv: B.A.T.M.A.N. advanced 2019.5 (compatibility version 15) loaded
openvswitch: Open vSwitch switching datapath
NET: Registered protocol family 40
mpls_gso: MPLS GSO support
IPI shorthand broadcast: enabled
AVX2 version of gcm_enc/dec engaged.
AES CTR mode by8 optimization enabled
sched_clock: Marking stable (13626543383, 14191347)->(13644505126, -3770396)
registered taskstats version 1
Loading compiled-in X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key: 8b22f477d966bfa6cf9a482acbda6ca1892a4acc'
zswap: loaded using pool lzo/zbud
Key type ._fscrypt registered
Key type .fscrypt registered
Btrfs loaded, crc32c=crc32c-intel
Key type big_key registered
Key type encrypted registered
AppArmor: AppArmor sha1 policy hashing enabled
ima: No TPM chip found, activating TPM-bypass!
ima: Allocated hash algorithm: sha256
ima: No architecture policies found
evm: Initialising EVM extended attributes:
evm: security.selinux
evm: security.SMACK64
evm: security.SMACK64EXEC
evm: security.SMACK64TRANSMUTE
evm: security.SMACK64MMAP
evm: security.apparmor
evm: security.ima
evm: security.capability
evm: HMAC attrs: 0x1
PM:   Magic number: 15:343:458
usb usb23-port8: hash matches
printk: console [netcon0] enabled
netconsole: network logging started
gtp: GTP module loaded (pdp ctx size 104 bytes)
rdma_rxe: loaded
cfg80211: Loading compiled-in X.509 certificates for regulatory database
cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
ALSA device list:
  #0: Dummy 1
  #1: Loopback 1
  #2: Virtual MIDI Card 1
md: Waiting for all devices to be available before autodetect
md: If you don't use raid, use raid=noautodetect
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc2-next-20191216-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strncpy+0x35/0xc0 lib/string.c:119
Code: e5 41 56 41 55 4c 8d 34 17 49 bd 00 00 00 00 00 fc ff df 41 54 53 48 89 fb 48 83 ec 10 48 89 f2 48 89 f1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 2a 38 ca 7f 04 84 d2 75 40 48 89 da 48 89 d9 44 0f b6
RSP: 0000:ffffc90000c7fca8 EFLAGS: 00010246
RAX: ffff8882153f0000 RBX: ffff8882153f0000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8882153f0000
RBP: ffffc90000c7fcd8 R08: ffff8882153f0000 R09: ffffed1015d27074
R10: ffffed1015d27073 R11: ffff8880ae93839b R12: ffffea000854fc00
R13: dffffc0000000000 R14: ffff8882153f0fff R15: ffff88809959b000
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000986d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strncpy include/linux/string.h:326 [inline]
 do_mount_root+0x74/0x23b init/do_mounts.c:404
 mount_block_root+0x342/0x51a init/do_mounts.c:438
 mount_root+0x283/0x2cd init/do_mounts.c:628
 prepare_namespace+0x26f/0x2a7 init/do_mounts.c:687
 kernel_init_freeable+0x557/0x570 init/main.c:1233
 kernel_init+0x12/0x1bf init/main.c:1112
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 2194c43b1c114543 ]---
RIP: 0010:strncpy+0x35/0xc0 lib/string.c:119
Code: e5 41 56 41 55 4c 8d 34 17 49 bd 00 00 00 00 00 fc ff df 41 54 53 48 89 fb 48 83 ec 10 48 89 f2 48 89 f1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 2a 38 ca 7f 04 84 d2 75 40 48 89 da 48 89 d9 44 0f b6
RSP: 0000:ffffc90000c7fca8 EFLAGS: 00010246
RAX: ffff8882153f0000 RBX: ffff8882153f0000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8882153f0000
RBP: ffffc90000c7fcd8 R08: ffff8882153f0000 R09: ffffed1015d27074
R10: ffffed1015d27073 R11: ffff8880ae93839b R12: ffffea000854fc00
R13: dffffc0000000000 R14: ffff8882153f0fff R15: ffff88809959b000
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000986d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/17 01:39 linux-next cf2be78b22e0 d13d7958 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/17 01:39 linux-next cf2be78b22e0 d13d7958 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/17 01:39 linux-next cf2be78b22e0 d13d7958 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/16 16:52 linux-next cf2be78b22e0 b80769fc .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/16 16:52 linux-next cf2be78b22e0 b80769fc .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/16 16:52 linux-next cf2be78b22e0 b80769fc .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/16 16:34 linux-next cf2be78b22e0 eef6e580 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/16 16:34 linux-next cf2be78b22e0 eef6e580 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/12/16 16:34 linux-next cf2be78b22e0 eef6e580 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.