Hello, syzbot found the following issue on: HEAD commit: f07669df libbpf: Remove redundant semi-colon git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=1564f0e2d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7eff0f22b8563a5f dashboard link: https://syzkaller.appspot.com/bug?extid=7b6548ae483d6f4c64ae syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16462311d00000 The issue was bisected to: commit 997acaf6b4b59c6a9c259740312a69ea549cc684 Author: Mark Rutland <mark.rutland@xxxxxxx> Date: Mon Jan 11 15:37:07 2021 +0000 lockdep: report broken irq restoration bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12c1c9ced00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11c1c9ced00000 console output: https://syzkaller.appspot.com/x/log.txt?x=16c1c9ced00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7b6548ae483d6f4c64ae@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 997acaf6b4b5 ("lockdep: report broken irq restoration") ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 Read of size 8 at addr ffff888024f66238 by task syz-executor.1/14202 CPU: 0 PID: 14202 Comm: syz-executor.1 Not tainted 5.12.0-rc4-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 __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] sk_psock_stop+0x2f/0x4d0 net/core/skmsg.c:750 sock_map_close+0x172/0x390 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:140 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:00007f1bde3a3188 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: 00007ffe6eb13bbf R14: 00007f1bde3a3300 R15: 0000000000022000 Allocated by task 14202: 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:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc_node include/linux/slab.h:572 [inline] kzalloc_node include/linux/slab.h:695 [inline] sk_psock_init+0xaf/0x730 net/core/skmsg.c:668 sock_map_link+0xbf4/0x1020 net/core/sock_map.c:286 sock_hash_update_common+0xe2/0xa60 net/core/sock_map.c:993 sock_map_update_elem_sys+0x561/0x680 net/core/sock_map.c:596 bpf_map_update_value.isra.0+0x36b/0x8d0 kernel/bpf/syscall.c:167 map_update_elem kernel/bpf/syscall.c:1129 [inline] __do_sys_bpf+0x2d6e/0x4f40 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 9712: 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+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4213 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+0x5c1/0xf00 kernel/workqueue.c:1497 rcu_work_rcufn+0x58/0x80 kernel/workqueue.c:1733 rcu_do_batch kernel/rcu/tree.c:2559 [inline] rcu_core+0x74a/0x12f0 kernel/rcu/tree.c:2794 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 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:3039 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3114 queue_rcu_work+0x82/0xa0 kernel/workqueue.c:1753 sk_psock_put include/linux/skmsg.h:446 [inline] sock_map_unref+0x109/0x190 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+0x12f/0x390 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:140 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 ffff888024f66000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 568 bytes inside of 2048-byte region [ffff888024f66000, ffff888024f66800) The buggy address belongs to the page: page:ffffea000093d800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888024f60000 pfn:0x24f60 head:ffffea000093d800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 ffffea0000951000 0000000200000002 ffff888010842000 raw: ffff888024f60000 0000000080080007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888024f66100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024f66180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024f66200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024f66280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024f66300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
