========================= WARNING: held lock freed! 4.15.0-rc8+ #263 Not tainted ------------------------- syz-executor1/3983 is freeing memory 00000000f98ef97b-00000000de917d97, with a lock still held there! (sk_lock-AF_INET6){+.+.}, at: [<000000009b1d9134>] lock_sock include/net/sock.h:1461 [inline] (sk_lock-AF_INET6){+.+.}, at: [<000000009b1d9134>] sctp_wait_for_sndbuf+0x509/0x8d0 net/sctp/socket.c:8056 1 lock held by syz-executor1/3983: #0: (sk_lock-AF_INET6){+.+.}, at: [<000000009b1d9134>] lock_sock include/net/sock.h:1461 [inline] #0: (sk_lock-AF_INET6){+.+.}, at: [<000000009b1d9134>] sctp_wait_for_sndbuf+0x509/0x8d0 net/sctp/socket.c:8056 stack backtrace: CPU: 1 PID: 3983 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #263 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+0x194/0x257 lib/dump_stack.c:53 print_freed_lock_bug kernel/locking/lockdep.c:4379 [inline] debug_check_no_locks_freed+0x32f/0x3c0 kernel/locking/lockdep.c:4412 kmem_cache_free+0x68/0x2a0 mm/slab.c:3743 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x622/0x910 net/core/sock.c:1585 sk_destruct+0x47/0x80 net/core/sock.c:1593 __sk_free+0x57/0x230 net/core/sock.c:1601 sk_free+0x2a/0x40 net/core/sock.c:1612 sock_put include/net/sock.h:1656 [inline] sctp_association_destroy net/sctp/associola.c:424 [inline] sctp_association_put+0x14c/0x2f0 net/sctp/associola.c:883 sctp_wait_for_sndbuf+0x673/0x8d0 net/sctp/socket.c:8067 sctp_sendmsg+0x277d/0x3360 net/sctp/socket.c:1974 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xca/0x110 net/socket.c:648 SYSC_sendto+0x361/0x5c0 net/socket.c:1729 SyS_sendto+0x40/0x50 net/socket.c:1697 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452df9 RSP: 002b:00007f3cb15c6c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000071c010 RCX: 0000000000452df9 RDX: 0000000000000001 RSI: 000000002010bf14 RDI: 0000000000000013 RBP: 00000000000003bb R08: 00000000204d9000 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3a28 R13: 00000000ffffffff R14: 00007f3cb15c76d4 R15: 0000000000000004 ================================================================== BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x5b7/0x980 include/trace/events/lock.h:13 Read of size 8 at addr ffff8801bd4048b8 by task syz-executor1/3983 CPU: 1 PID: 3983 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #263 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+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 perf_trace_lock_acquire+0x5b7/0x980 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x394/0x580 kernel/locking/lockdep.c:3913 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:315 [inline] release_sock+0x74/0x2a0 net/core/sock.c:2777 sctp_sendmsg+0x2c61/0x3360 net/sctp/socket.c:2058 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xca/0x110 net/socket.c:648 SYSC_sendto+0x361/0x5c0 net/socket.c:1729 SyS_sendto+0x40/0x50 net/socket.c:1697 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452df9 RSP: 002b:00007f3cb15c6c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000071c010 RCX: 0000000000452df9 RDX: 0000000000000001 RSI: 000000002010bf14 RDI: 0000000000000013 RBP: 00000000000003bb R08: 00000000204d9000 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3a28 R13: 00000000ffffffff R14: 00007f3cb15c76d4 R15: 0000000000000004 Allocated by task 3995: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544 sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463 sk_alloc+0x105/0x1410 net/core/sock.c:1523 sctp_v6_create_accept_sk+0x15a/0x9b0 net/sctp/ipv6.c:667 sctp_accept+0x5c4/0x970 net/sctp/socket.c:4324 inet_accept+0x12c/0x930 net/ipv4/af_inet.c:698 SYSC_accept4+0x38d/0x870 net/socket.c:1553 SyS_accept4 net/socket.c:1504 [inline] SYSC_accept net/socket.c:1587 [inline] SyS_accept+0x26/0x30 net/socket.c:1584 entry_SYSCALL_64_fastpath+0x29/0xa0 Freed by task 3983: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3488 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3746 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x622/0x910 net/core/sock.c:1585 sk_destruct+0x47/0x80 net/core/sock.c:1593 __sk_free+0x57/0x230 net/core/sock.c:1601 sk_free+0x2a/0x40 net/core/sock.c:1612 sock_put include/net/sock.h:1656 [inline] sctp_association_destroy net/sctp/associola.c:424 [inline] sctp_association_put+0x14c/0x2f0 net/sctp/associola.c:883 sctp_wait_for_sndbuf+0x673/0x8d0 net/sctp/socket.c:8067 sctp_sendmsg+0x277d/0x3360 net/sctp/socket.c:1974 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg+0xca/0x110 net/socket.c:648 SYSC_sendto+0x361/0x5c0 net/socket.c:1729 SyS_sendto+0x40/0x50 net/socket.c:1697 entry_SYSCALL_64_fastpath+0x29/0xa0 The buggy address belongs to the object at ffff8801bd404800 which belongs to the cache SCTPv6 of size 1888 The buggy address is located 184 bytes inside of 1888-byte region [ffff8801bd404800, ffff8801bd404f60) The buggy address belongs to the page: page:ffffea0006f50100 count:1 mapcount:0 mapping:ffff8801bd404000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801bd404000 0000000000000000 0000000100000002 raw: ffffea0006f2aea0 ffffea0006f4be60 ffff8801d2c40500 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bd404780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801bd404800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801bd404880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801bd404900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801bd404980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================