================================================================== kasan: CONFIG_KASAN_INLINE enabled BUG: KASAN: stack-out-of-bounds in cgroup_base_stat_cputime_account_begin kernel/cgroup/rstat.c:349 [inline] BUG: KASAN: stack-out-of-bounds in __cgroup_account_cputime_field+0xe1/0xf0 kernel/cgroup/rstat.c:376 Read of size 8 at addr ffff8801adb15a38 by task syz-executor6/15691 kasan: GPF could be caused by NULL-ptr deref or user memory access CPU: 0 PID: 15691 Comm: syz-executor6 Not tainted 4.18.0-rc3+ #58 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 general protection fault: 0000 [#1] SMP KASAN kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 CPU: 1 PID: 15712 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #58 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:compound_head include/linux/page-flags.h:142 [inline] RIP: 0010:PageSwapCache include/linux/page-flags.h:338 [inline] RIP: 0010:free_swap_cache mm/swap_state.c:290 [inline] RIP: 0010:free_pages_and_swap_cache+0x119/0x510 mm/swap_state.c:318 cgroup_base_stat_cputime_account_begin kernel/cgroup/rstat.c:349 [inline] __cgroup_account_cputime_field+0xe1/0xf0 kernel/cgroup/rstat.c:376 Code: cgroup_account_cputime_field include/linux/cgroup.h:744 [inline] task_group_account_field kernel/sched/cputime.c:108 [inline] account_system_index_time+0x2fb/0x5c0 kernel/sched/cputime.c:171 48 c1 e8 03 80 3c account_system_time+0x7f/0xb0 kernel/sched/cputime.c:199 18 account_process_tick+0x76/0x240 kernel/sched/cputime.c:498 00 0f 85 4f update_process_times+0x21/0x70 kernel/time/timer.c:1634 03 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 00 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 00 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x3eb/0x10c0 kernel/time/hrtimer.c:1460 4d 8b 2e 48 8b 85 f0 fe ff ff c6 00 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 00 49 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x165/0x730 arch/x86/kernel/apic/apic.c:1050 8d 45 08 48 89 85 c8 fe apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 ff ff 48 Allocated by task 4478: c1 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 e8 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 03 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:707 [inline] cgroup_create kernel/cgroup/cgroup.c:4823 [inline] cgroup_mkdir+0x302/0x1170 kernel/cgroup/cgroup.c:4948 <80> 3c kernfs_iop_mkdir+0x159/0x1e0 fs/kernfs/dir.c:1099 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3827 18 00 do_mkdirat+0x27b/0x310 fs/namei.c:3850 __do_sys_mkdir fs/namei.c:3866 [inline] __se_sys_mkdir fs/namei.c:3864 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3864 0f do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 85 8f entry_SYSCALL_64_after_hwframe+0x49/0xbe 03 00 Freed by task 5380: 00 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 48 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 8b sk_prot_free net/core/sock.c:1550 [inline] __sk_destruct+0x791/0xa60 net/core/sock.c:1632 b5 sk_destruct+0x78/0x90 net/core/sock.c:1640 f0 __sk_free+0xcf/0x300 net/core/sock.c:1651 fe ff sk_free+0x42/0x50 net/core/sock.c:1662 ff 49 deferred_put_nlk_sk+0x164/0x350 net/netlink/af_netlink.c:741 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2558 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline] rcu_process_callbacks+0xed5/0x1850 kernel/rcu/tree.c:2802 8b __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 45 The buggy address belongs to the object at ffff8801adb156c0 which belongs to the cache kmalloc-2048 of size 2048 08 80 The buggy address is located 888 bytes inside of 2048-byte region [ffff8801adb156c0, ffff8801adb15ec0) RSP: 0018:ffff88019aceea28 EFLAGS: 00010203 The buggy address belongs to the page: page:ffffea0006b6c500 count:1 mapcount:0 mapping:ffff8801da800c40 index:0xffff8801adb14e40 RAX: 090a88207d18290b RBX: dffffc0000000000 RCX: ffffffff81b29b10 RDX: 0000000000000000 RSI: ffffffff81b29b4c RDI: 0000000000000005 compound_mapcount: 0 RBP: ffff88019aceeb70 R08: ffff8801c9eda5c0 R09: fffff94000d2990e R10: fffff94000d2990e R11: ffffea000694c877 R12: dffffc0000000000 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006ec7808 ffffea0006af3f88 ffff8801da800c40 R13: 48544103e8c14855 R14: ffffffff81912b80 R15: 0000000000000000 raw: ffff8801adb14e40 ffff8801adb145c0 0000000100000002 0000000000000000 FS: 00007fe59f638700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 page dumped because: kasan: bad access detected CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000702138 CR3: 00000001a19a9000 CR4: 00000000001406e0 DR0: 00000000200001c0 DR1: 0000000020000080 DR2: 0000000000000000 Memory state around the buggy address: ffff8801adb15900: f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: ffff8801adb15980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 >ffff8801adb15a00: f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 ^ ffff8801adb15a80: f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 ffff8801adb15b00: f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 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