linux-kernel - [syzbot] upstream boot error: BUG: unable to handle kernel NULL pointer dereference in corrupted

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Message-ID: <00000000000058a08405fa6ba52a@google.com>
Date:   Fri, 28 Apr 2023 13:52:06 -0700
From:   syzbot <syzbot+0f3348b0cb4da6b6072d@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] upstream boot error: BUG: unable to handle kernel NULL
 pointer dereference in corrupted

Hello,

syzbot found the following issue on:

HEAD commit:    22b8cc3e78f5 Merge tag 'x86_mm_for_6.4' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11fa5010280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1af34c4cafb72074
dashboard link: https://syzkaller.appspot.com/bug?extid=0f3348b0cb4da6b6072d
compiler:       arm-linux-gnueabi-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0f3348b0cb4da6b6072d@...kaller.appspotmail.com

Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000080000000-0x00000000ffffffff]
Initmem setup node 0 [mem 0x0000000080000000-0x00000000ffffffff]
percpu: Embedded 19 pages/cpu s47048 r8192 d22584 u77824
Kernel command line: root=/dev/vda console=ttyAMA0  earlyprintk=serial net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1 ima_policy=tcb nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 binder.debug_mask=0 rcupdate.rcu_expedited=1 rcupdate.rcu_cpu_stall_cputime=1 no_hash_pointers page_owner=on sysctl.vm.nr_hugepages=4 sysctl.vm.nr_overcommit_hugepages=4 secretmem.enable=1 sysctl.max_rcu_stall_to_panic=1 msr.allow_writes=off coredump_filter=0xffff root=/dev/vda console=ttyAMA0 vmalloc=512M smp.csd_lock_timeout=300000 watchdog_thresh=165 workqueue.watchdog_thresh=420 sysctl.net.core.netdev_unregister_timeout_secs=420 dummy_hcd.num=2 panic_on_warn=1
Unknown kernel command line parameters "earlyprintk=serial page_owner=on", will be passed to user space.
Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes, linear)
Inode-cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
Built 1 zonelists, mobility grouping on.  Total pages: 520868
allocated 2097152 bytes of page_ext
mem auto-init: stack:off, heap alloc:on, heap free:off
software IO TLB: area num 2.
software IO TLB: mapped [mem 0x00000000d9a47000-0x00000000dda47000] (64MB)
Memory: 1954368K/2097152K available (22528K kernel code, 2361K rwdata, 8400K rodata, 2048K init, 867K bss, 126400K reserved, 16384K cma-reserved, 524288K highmem)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
trace event string verifier disabled
rcu: Preemptible hierarchical RCU implementation.
rcu: 	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
rcu: 	RCU callback double-/use-after-free debug is enabled.
	All grace periods are expedited (rcu_expedited).
	Trampoline variant of Tasks RCU enabled.
	Tracing variant of Tasks RCU enabled.
rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
GIC physical location is 0x2c001000
rcu: srcu_init: Setting srcu_struct sizes based on contention.
sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
clocksource: arm,sp804: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275 ns
arch_timer: cp15 timer(s) running at 62.50MHz (virt).
clocksource: arch_sys_counter: mask: 0x1ffffffffffffff max_cycles: 0x1cd42e208c, max_idle_ns: 881590405314 ns
sched_clock: 57 bits at 63MHz, resolution 16ns, wraps every 4398046511096ns
Switching to timer-based delay loop, resolution 16ns
Console: colour dummy device 80x30
Calibrating delay loop (skipped), value calculated using timer frequency.. 125.00 BogoMIPS (lpj=625000)
pid_max: default: 32768 minimum: 301
LSM: initializing lsm=lockdown,capability,landlock,yama,safesetid,tomoyo,selinux,bpf,integrity
landlock: Up and running.
Yama: becoming mindful.
TOMOYO Linux initialized
SELinux:  Initializing.
LSM support for eBPF active
stackdepot: allocating hash table of 131072 entries via kvcalloc
Mount-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
Mountpoint-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
CPU: Testing write buffer coherency: ok
CPU0: Spectre BHB: enabling loop workaround for all CPUs
CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000206 when execute
[00000206] *pgd=80000080004003, *pmd=00000000


---
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