NOHZ: local_softirq_pending 08 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3098/0x4620 kernel/locking/lockdep.c:3365 Read of size 8 at addr ffff8880a8e598a0 by task syz-executor.0/14268 CPU: 1 PID: 14268 Comm: syz-executor.0 Not tainted 4.14.170-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __lock_acquire+0x3098/0x4620 kernel/locking/lockdep.c:3365 lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x33/0x50 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] __lock_sock+0x13a/0x210 net/core/sock.c:2241 lock_sock_nested+0xee/0x110 net/core/sock.c:2764 lock_sock include/net/sock.h:1467 [inline] sctp_sock_dump+0x122/0xb00 net/sctp/sctp_diag.c:294 sctp_for_each_transport+0x251/0x2e0 net/sctp/socket.c:4748 sctp_diag_dump+0x2de/0x3c0 net/sctp/sctp_diag.c:497 __inet_diag_dump+0x8e/0x120 net/ipv4/inet_diag.c:1053 inet_diag_dump+0x8e/0x110 net/ipv4/inet_diag.c:1069 netlink_dump+0x3fa/0xb10 net/netlink/af_netlink.c:2202 __netlink_dump_start+0x4e6/0x740 net/netlink/af_netlink.c:2299 netlink_dump_start include/linux/netlink.h:217 [inline] inet_diag_handler_cmd+0x225/0x2e0 net/ipv4/inet_diag.c:1174 __sock_diag_cmd net/core/sock_diag.c:231 [inline] sock_diag_rcv_msg+0x29e/0x3a0 net/core/sock_diag.c:263 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 sock_diag_rcv+0x2b/0x40 net/core/sock_diag.c:274 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 sock_write_iter+0x25b/0x3b0 net/socket.c:925 call_write_iter include/linux/fs.h:1777 [inline] do_iter_readv_writev+0x418/0x670 fs/read_write.c:675 do_iter_write fs/read_write.c:954 [inline] do_iter_write+0x154/0x540 fs/read_write.c:935 vfs_writev+0x170/0x2a0 fs/read_write.c:999 do_writev+0x10a/0x2d0 fs/read_write.c:1034 SYSC_writev fs/read_write.c:1107 [inline] SyS_writev+0x28/0x30 fs/read_write.c:1104 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b3b9 RSP: 002b:00007f05a5187c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f05a51886d4 RCX: 000000000045b3b9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 000000000000000b RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cdd R14: 00000000004c9cc2 R15: 000000000075c07c Allocated by task 14267: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552 sk_prot_alloc+0x67/0x2a0 net/core/sock.c:1461 sk_alloc+0x39/0xd70 net/core/sock.c:1521 inet6_create net/ipv6/af_inet6.c:183 [inline] inet6_create+0x2d8/0xe10 net/ipv6/af_inet6.c:110 __sock_create+0x2f6/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd3/0x170 net/socket.c:1325 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 14267: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x83/0x2b0 mm/slab.c:3758 sk_prot_free net/core/sock.c:1502 [inline] __sk_destruct+0x3c5/0x650 net/core/sock.c:1581 sk_destruct+0xa4/0xd0 net/core/sock.c:1596 __sk_free+0x54/0x230 net/core/sock.c:1604 sk_free+0x35/0x40 net/core/sock.c:1615 sock_put include/net/sock.h:1658 [inline] sctp_close+0x5f0/0x730 net/sctp/socket.c:1589 inet_release+0xec/0x1c0 net/ipv4/af_inet.c:425 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:450 __sock_release+0xce/0x2b0 net/socket.c:602 sock_close+0x1b/0x30 net/socket.c:1139 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 get_signal+0x18a8/0x1cd0 kernel/signal.c:2229 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880a8e59800 which belongs to the cache SCTPv6 of size 1896 The buggy address is located 160 bytes inside of 1896-byte region [ffff8880a8e59800, ffff8880a8e59f68) The buggy address belongs to the page: page:ffffea0002a39640 count:1 mapcount:0 mapping:ffff8880a8e59000 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff8880a8e59000 0000000000000000 0000000100000002 raw: ffffea0002a2b460 ffffea00026cc4e0 ffff88809ac7e380 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8e59780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a8e59800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a8e59880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8e59900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8e59980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================