================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline] BUG: KASAN: use-after-free in try_to_grab_pending.part.0+0x26/0x770 kernel/workqueue.c:1257 Write of size 8 at addr ffff888019625390 by task syz-executor.5/25883 CPU: 1 PID: 25883 Comm: syz-executor.5 Not tainted 5.12.0-rc6-next-20210408-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline] try_to_grab_pending.part.0+0x26/0x770 kernel/workqueue.c:1257 try_to_grab_pending+0xa1/0xd0 kernel/workqueue.c:1310 __cancel_work_timer+0xa6/0x570 kernel/workqueue.c:3098 sk_psock_stop+0x3ab/0x4d0 net/core/skmsg.c:758 sock_map_close+0x144/0x3b0 net/core/sock_map.c:1534 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 __sock_release+0xcd/0x280 net/socket.c:599 sock_close+0x18/0x20 net/socket.c:1258 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3e8d1f6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc2724261f R14: 00007f3e8d1f6300 R15: 0000000000022000 Allocated by task 25883: 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:428 [inline] ____kasan_kmalloc mm/kasan/common.c:507 [inline] ____kasan_kmalloc mm/kasan/common.c:466 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516 kmalloc_node include/linux/slab.h:576 [inline] kzalloc_node include/linux/slab.h:699 [inline] sk_psock_init+0xaf/0x730 net/core/skmsg.c:669 sock_map_link+0xbf4/0x1020 net/core/sock_map.c:286 sock_hash_update_common+0xe2/0xa70 net/core/sock_map.c:993 sock_map_update_elem_sys+0x569/0x680 net/core/sock_map.c:596 bpf_map_update_value.isra.0+0x36b/0x8e0 kernel/bpf/syscall.c:167 map_update_elem kernel/bpf/syscall.c:1129 [inline] __do_sys_bpf+0x2d6e/0x4f50 kernel/bpf/syscall.c:4384 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 20: 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:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1593 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1618 slab_free mm/slub.c:3178 [inline] kfree+0xe5/0x7f0 mm/slub.c:4245 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 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:345 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1497 rcu_work_rcufn+0x58/0x80 kernel/workqueue.c:1733 rcu_do_batch kernel/rcu/tree.c:2537 [inline] rcu_core+0x7ab/0x13b0 kernel/rcu/tree.c:2772 __do_softirq+0x29b/0x9fe kernel/softirq.c:559 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:345 __call_rcu kernel/rcu/tree.c:3016 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3091 queue_rcu_work+0x82/0xa0 kernel/workqueue.c:1753 sk_psock_put include/linux/skmsg.h:446 [inline] sock_map_unref+0x15f/0x1a0 net/core/sock_map.c:182 sock_hash_delete_from_link net/core/sock_map.c:918 [inline] sock_map_unlink net/core/sock_map.c:1480 [inline] sock_map_remove_links+0x389/0x530 net/core/sock_map.c:1492 sock_map_close+0xfd/0x3b0 net/core/sock_map.c:1532 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 __sock_release+0xcd/0x280 net/socket.c:599 sock_close+0x18/0x20 net/socket.c:1258 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888019625000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 912 bytes inside of 2048-byte region [ffff888019625000, ffff888019625800) The buggy address belongs to the page: page:ffffea0000658800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x19620 head:ffffea0000658800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000600000001 ffff888010842000 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888019625280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888019625300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888019625380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888019625400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888019625480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================