================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_dec_if_positive include/asm-generic/atomic-instrumented.h:1176 [inline] BUG: KASAN: use-after-free in atomic_long_dec_if_positive include/asm-generic/atomic-long.h:515 [inline] BUG: KASAN: use-after-free in dec_ucount+0x54/0x130 kernel/ucount.c:245 Write of size 8 at addr ffff888017146440 by task kworker/u4:4/194 CPU: 0 PID: 194 Comm: kworker/u4:4 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic64_dec_if_positive include/asm-generic/atomic-instrumented.h:1176 [inline] atomic_long_dec_if_positive include/asm-generic/atomic-long.h:515 [inline] dec_ucount+0x54/0x130 kernel/ucount.c:245 dec_net_namespaces net/core/net_namespace.c:394 [inline] cleanup_net+0x6f3/0xb10 net/core/net_namespace.c:611 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 8453: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_ucounts+0x23d/0x5b0 kernel/ucount.c:169 set_cred_ucounts+0x171/0x3a0 kernel/cred.c:684 copy_creds+0x853/0xb20 kernel/cred.c:375 copy_process+0x1413/0x74c0 kernel/fork.c:1992 kernel_clone+0xe7/0xab0 kernel/fork.c:2509 __do_sys_clone+0xc8/0x110 kernel/fork.c:2626 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 45: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:229 [inline] slab_free_hook mm/slub.c:1639 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1664 slab_free mm/slub.c:3224 [inline] kfree+0xeb/0x670 mm/slub.c:4268 put_ucounts kernel/ucount.c:200 [inline] put_ucounts+0x117/0x150 kernel/ucount.c:192 dec_pid_namespaces kernel/pid_namespace.c:67 [inline] delayed_free_pidns+0x3f/0x120 kernel/pid_namespace.c:127 rcu_do_batch kernel/rcu/tree.c:2558 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2793 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435 kobject_uevent_env+0xf8f/0x1650 lib/kobject_uevent.c:618 kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208 store_uevent+0x12/0x20 kernel/module.c:1167 module_attr_store+0x50/0x80 kernel/params.c:901 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x796/0xa30 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:435 kobject_uevent_env+0xf8f/0x1650 lib/kobject_uevent.c:618 kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208 uevent_store+0x42/0x90 drivers/base/bus.c:585 drv_attr_store+0x6d/0xa0 drivers/base/bus.c:77 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x796/0xa30 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888017146400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 64 bytes inside of 192-byte region [ffff888017146400, ffff8880171464c0) The buggy address belongs to the page: page:ffffea00005c5180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17146 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 0000000400000001 ffff888011041a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 2336635466, free_ts 2323673530 prep_new_page mm/page_alloc.c:2445 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4178 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2147 alloc_pages+0x238/0x2a0 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1702 [inline] allocate_slab+0x32b/0x4c0 mm/slub.c:1842 new_slab mm/slub.c:1905 [inline] new_slab_objects mm/slub.c:2651 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2814 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2854 slab_alloc_node mm/slub.c:2936 [inline] slab_alloc mm/slub.c:2978 [inline] kmem_cache_alloc_trace+0x325/0x3c0 mm/slub.c:2995 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] call_usermodehelper_setup+0x97/0x340 kernel/umh.c:365 kobject_uevent_env+0xf73/0x1650 lib/kobject_uevent.c:614 kernel_add_sysfs_param kernel/params.c:798 [inline] param_sysfs_builtin kernel/params.c:833 [inline] param_sysfs_init+0x3bf/0x498 kernel/params.c:952 do_one_initcall+0x103/0x650 init/main.c:1246 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1355 [inline] kernel_init_freeable+0x6b8/0x741 init/main.c:1557 kernel_init+0x1a/0x1d0 init/main.c:1449 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1355 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3341 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3420 __vunmap+0x783/0xb70 mm/vmalloc.c:2569 free_work+0x58/0x70 mm/vmalloc.c:80 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888017146300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888017146380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff888017146400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888017146480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888017146500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================