syzbot


upstream 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+958915844b296815c246@syzkaller.appspotmail.com
Fix commit: 7de7de7ca0ae Fix root mounting with no mount options
First crash: 1651d, last: 1651d
Discussions (1)
Title Replies (including bot) Last reply
upstream boot error: general protection fault in do_mount_root 1 (2) 2019/12/16 17:21

Sample crash report:
mpls_gso: MPLS GSO support
IPI shorthand broadcast: enabled
AVX2 version of gcm_enc/dec engaged.
AES CTR mode by8 optimization enabled
registered taskstats version 1
Loading compiled-in X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key: 2a1122198a3e68692ac5775a16203e4f5f9d30c2'
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
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: 15:769:725
block loop5: 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'
Unstable clock detected, switching default tracing clock to "global"
If you want to keep using the local clock, then add:
  "trace_clock=local"
on the kernel command line
ALSA device list:
  #0: Dummy 1
  #1: Loopback 1
  #2: Virtual MIDI Card 1
  #3: HDA Intel at 0xfebf0000 irq 31
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: 2 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
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:ffffc9000034fca8 EFLAGS: 00010246
RAX: ffff8880737aa000 RBX: ffff8880737aa000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880737aa000
RBP: ffffc9000034fcd8 R08: ffff8880737aa000 R09: ffffed1005a4703d
R10: ffffed1005a4703c R11: ffff88802d2381e3 R12: ffffea0001cdea80
R13: dffffc0000000000 R14: ffff8880737aafff R15: ffff8880295a9000
FS:  0000000000000000(0000) GS:ffff88802d200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000ffffffff CR3: 000000000986d000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strncpy include/linux/string.h:281 [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:1231
 kernel_init+0x12/0x1bf init/main.c:1110
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 558d6fee630446c3 ]---
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:ffffc9000034fca8 EFLAGS: 00010246
RAX: ffff8880737aa000 RBX: ffff8880737aa000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880737aa000
RBP: ffffc9000034fcd8 R08: ffff8880737aa000 R09: ffffed1005a4703d
R10: ffffed1005a4703c R11: ffff88802d2381e3 R12: ffffea0001cdea80
R13: dffffc0000000000 R14: ffff8880737aafff R15: ffff8880295a9000
FS:  0000000000000000(0000) GS:ffff88802d200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000ffffffff CR3: 000000000986d000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/16 08:53 upstream d1eef1c61974 0ae38e44 .config console log report ci-qemu-upstream
2019/12/16 08:53 upstream d1eef1c61974 0ae38e44 .config console log report ci-qemu-upstream
2019/12/16 08:53 upstream d1eef1c61974 0ae38e44 .config console log report ci-qemu-upstream
2019/12/16 01:30 upstream d1eef1c61974 eef6e580 .config console log report ci-qemu-upstream
2019/12/16 01:30 upstream d1eef1c61974 eef6e580 .config console log report ci-qemu-upstream
2019/12/16 01:30 upstream d1eef1c61974 eef6e580 .config console log report ci-qemu-upstream
2019/12/16 09:06 upstream d1eef1c61974 0ae38e44 .config console log report ci-qemu-upstream-386
2019/12/16 09:06 upstream d1eef1c61974 0ae38e44 .config console log report ci-qemu-upstream-386
2019/12/16 09:06 upstream d1eef1c61974 0ae38e44 .config console log report ci-qemu-upstream-386
2019/12/16 01:06 upstream d1eef1c61974 eef6e580 .config console log report ci-qemu-upstream-386
2019/12/16 01:06 upstream d1eef1c61974 eef6e580 .config console log report ci-qemu-upstream-386
2019/12/16 01:06 upstream d1eef1c61974 eef6e580 .config console log report ci-qemu-upstream-386
* Struck through repros no longer work on HEAD.