kmem: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: cache:28KB rss:274692KB rss_huge:190464KB shmem:64KB mapped_file:0KB dirty:0KB writeback:0KB swap:0KB inactive_anon:222780KB active_anon:4152KB inactive_file:0KB active_file:0KB unevictable:47872KB oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=syz1,mems_allowed=0-1,oom_memcg=/syz1,task_memcg=/syz1,task=syz-executor1,pid=15858,uid=0 Memory cgroup out of memory: Kill process 15858 (syz-executor1) score 1148 or sacrifice child ================================================================== BUG: KASAN: use-after-free in oom_kill_process.cold+0x484/0x9d4 mm/oom_kill.c:978 Read of size 8 at addr ffff8880595f6c40 by task syz-executor1/15817 CPU: 1 PID: 15817 Comm: syz-executor1 Not tainted 5.0.0-rc2+ #29 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 oom_kill_process.cold+0x484/0x9d4 mm/oom_kill.c:978 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133 mem_cgroup_out_of_memory+0x160/0x210 mm/memcontrol.c:1393 mem_cgroup_oom mm/memcontrol.c:1721 [inline] try_charge+0xd44/0x19b0 mm/memcontrol.c:2283 memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2591 memcg_kmem_charge+0x13b/0x340 mm/memcontrol.c:2624 __alloc_pages_nodemask+0x7b8/0xdc0 mm/page_alloc.c:4559 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:246 [inline] dup_task_struct kernel/fork.c:849 [inline] copy_process+0x847/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f36f091cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457ec9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36f091d6d4 R13: 00000000004be2a0 R14: 00000000004ce760 R15: 00000000ffffffff Allocated by task 15809: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc_node+0x144/0x710 mm/slab.c:3633 alloc_task_struct_node kernel/fork.c:158 [inline] dup_task_struct kernel/fork.c:845 [inline] copy_process+0x405b/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15817: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 free_task_struct kernel/fork.c:163 [inline] free_task+0x170/0x1f0 kernel/fork.c:458 __put_task_struct+0x2e0/0x630 kernel/fork.c:731 put_task_struct+0x4b/0x60 include/linux/sched/task.h:98 oom_kill_process.cold+0x93a/0x9d4 mm/oom_kill.c:990 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133 mem_cgroup_out_of_memory+0x160/0x210 mm/memcontrol.c:1393 mem_cgroup_oom mm/memcontrol.c:1721 [inline] try_charge+0xd44/0x19b0 mm/memcontrol.c:2283 memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2591 memcg_kmem_charge+0x13b/0x340 mm/memcontrol.c:2624 __alloc_pages_nodemask+0x7b8/0xdc0 mm/page_alloc.c:4559 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_node include/linux/gfp.h:500 [inline] alloc_thread_stack_node kernel/fork.c:246 [inline] dup_task_struct kernel/fork.c:849 [inline] copy_process+0x847/0x8710 kernel/fork.c:1753 _do_fork+0x1a9/0x1170 kernel/fork.c:2227 __do_sys_clone kernel/fork.c:2334 [inline] __se_sys_clone kernel/fork.c:2328 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2328 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880595f6540 which belongs to the cache task_struct(33:syz1) of size 6080 The buggy address is located 1792 bytes inside of 6080-byte region [ffff8880595f6540, ffff8880595f7d00) The buggy address belongs to the page: page:ffffea0001657d80 count:1 mapcount:0 mapping:ffff888091f65840 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00028b3288 ffffea0002612788 ffff888091f65840 raw: 0000000000000000 ffff8880595f6540 0000000100000001 ffff888057fe2b00 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888057fe2b00 Memory state around the buggy address: ffff8880595f6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880595f6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880595f6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880595f6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880595f6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1