Hello, syzbot found the following issue on: HEAD commit: e6d113ac Add linux-next specific files for 20200813 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11db9fd6900000 kernel config: https://syzkaller.appspot.com/x/.config?x=2055bd0d83d5ee16 dashboard link: https://syzkaller.appspot.com/bug?extid=f96cbc69d9803e663664 compiler: gcc (GCC) 10.1.0-syz 20200507 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f96cbc69d9803e663664@xxxxxxxxxxxxxxxxxxxxxxxxx mem auto-init: stack:off, heap alloc:on, heap free:off Memory: 6458876K/7863916K available (116743K kernel code, 18258K rwdata, 21644K rodata, 2812K init, 25364K bss, 1404784K reserved, 0K cma-reserved) Running RCU self tests rcu: Preemptible hierarchical RCU implementation. rcu: RCU lockdep checking is enabled. rcu: RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=2. rcu: RCU callback double-/use-after-free debug enabled. rcu: RCU debug extended QS entry/exit. All grace periods are expedited (rcu_expedited). Trampoline 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: 4352, nr_irqs: 440, preallocated irqs: 16 random: get_random_bytes called from boot_init_stack_canary arch/x86/include/asm/stackprotector.h:80 [inline] with crng_init=0 random: get_random_bytes called from start_kernel+0x23b/0x46a init/main.c:957 with crng_init=0 Console: colour VGA+ 80x25 printk: console [ttyS0] enabled printk: console [ttyS0] enabled printk: bootconsole [earlyser0] disabled printk: bootconsole [earlyser0] disabled Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar ... MAX_LOCKDEP_SUBCLASSES: 8 ... MAX_LOCK_DEPTH: 48 ... MAX_LOCKDEP_KEYS: 8192 ... CLASSHASH_SIZE: 4096 ... MAX_LOCKDEP_ENTRIES: 32768 ... MAX_LOCKDEP_CHAINS: 65536 ... CHAINHASH_SIZE: 32768 memory used by lock dependency info: 6301 kB memory used for stack traces: 4224 kB per task-struct memory footprint: 1920 bytes mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl ACPI: Core revision 20200717 APIC: Switch to symmetric I/O mode setup x2apic enabled Switched APIC routing to physical x2apic. ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x212735223b2, max_idle_ns: 440795277976 ns Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000) pid_max: default: 32768 minimum: 301 LSM: Security Framework initializing LSM: security= is ignored because it is superseded by lsm= Yama: becoming mindful. TOMOYO Linux initialized AppArmor: AppArmor initialized LSM support for eBPF active Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, vmalloc) Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc) Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, vmalloc) Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, vmalloc) ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at mm/memcontrol.c:5226 memalloc_unuse_memcg include/linux/sched/mm.h:331 [inline] WARNING: CPU: 0 PID: 0 at mm/memcontrol.c:5226 mem_cgroup_css_alloc+0x535/0x1c30 mm/memcontrol.c:5285 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-next-20200813-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x4a kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:mem_cgroup_alloc mm/memcontrol.c:5226 [inline] RIP: 0010:mem_cgroup_css_alloc+0x535/0x1c30 mm/memcontrol.c:5284 Code: 01 00 48 8d bb 48 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 74 81 e8 a0 79 c0 f9 e9 77 ff ff ff <0f> 0b e9 21 fc ff ff 48 89 ef e8 3c af c5 f9 48 b8 00 00 00 00 00 RSP: 0000:ffffffff89a07e20 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffff89a99dc0 RCX: 1ffff110436f4c28 RDX: 1ffffffff1353641 RSI: ffffffff83b2f532 RDI: ffffffff89a9b208 RBP: ffff88821b7a6000 R08: 0000000000000001 R09: ffff8880a9c06b6f R10: 0000000000000000 R11: ffffffff810000d4 R12: ffffffff8abb6bb4 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8abb6bd0 cgroup_init_subsys+0x215/0x4d7 kernel/cgroup/cgroup.c:5587 cgroup_init+0x359/0xa63 kernel/cgroup/cgroup.c:5713 start_kernel+0x426/0x46a init/main.c:1035 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Rebooting in 86400 seconds.. --- This report is generated by a bot. 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