[ 36.588740] ? tick_nohz_idle_enter+0xd9/0x160 [ 36.593286] ? trace_hardirqs_on+0xd/0x10 [ 36.597397] default_idle+0xbf/0x460 [ 36.601073] ? __sched_text_end+0x4/0x4 [ 36.605015] arch_cpu_idle+0xa/0x10 [ 36.608605] default_idle_call+0x36/0x90 [ 36.612628] do_idle+0x24e/0x3b0 [ 36.615958] cpu_startup_entry+0x18/0x20 [ 36.619982] start_secondary+0x2ea/0x3f0 [ 36.624007] secondary_startup_64+0xa5/0xa5 Warning: Permanently added 'ci-upstream-net-kasan-gce-8,10.128.0.6' (ECDSA) to the list of known hosts. executing program [ 42.679898] refcount_t: underflow; use-after-free. [ 42.684955] ------------[ cut here ]------------ [ 42.689704] WARNING: CPU: 0 PID: 2993 at lib/refcount.c:186 refcount_sub_and_test+0x167/0x1b0 [ 42.698345] Kernel panic - not syncing: panic_on_warn set ... [ 42.698345] [ 42.705673] CPU: 0 PID: 2993 Comm: syzkaller896729 Not tainted 4.14.0-rc4+ #84 [ 42.712998] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.722316] Call Trace: [ 42.724870] dump_stack+0x194/0x257 [ 42.728466] ? arch_local_irq_restore+0x53/0x53 [ 42.733106] panic+0x1e4/0x417 [ 42.736265] ? __warn+0x1d9/0x1d9 [ 42.739682] ? show_regs_print_info+0x65/0x65 [ 42.744150] ? refcount_sub_and_test+0x167/0x1b0 [ 42.748870] __warn+0x1c4/0x1d9 [ 42.752117] ? refcount_sub_and_test+0x167/0x1b0 [ 42.756838] report_bug+0x211/0x2d0 [ 42.760433] fixup_bug+0x40/0x90 [ 42.763763] do_trap+0x260/0x390 [ 42.767098] do_error_trap+0x120/0x390 [ 42.770948] ? vprintk_emit+0x49b/0x590 [ 42.774887] ? do_trap+0x390/0x390 [ 42.778393] ? refcount_sub_and_test+0x167/0x1b0 [ 42.783114] ? vprintk_emit+0x3ea/0x590 [ 42.787059] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.791870] do_invalid_op+0x1b/0x20 [ 42.795547] invalid_op+0x18/0x20 [ 42.798967] RIP: 0010:refcount_sub_and_test+0x167/0x1b0 [ 42.804294] RSP: 0018:ffff8801ce14ea38 EFLAGS: 00010282 [ 42.809621] RAX: 0000000000000026 RBX: 0000000000000001 RCX: 0000000000000000 [ 42.816856] RDX: 0000000000000026 RSI: 1ffff10039c29d07 RDI: ffffed0039c29d3b [ 42.824092] RBP: ffff8801ce14eac8 R08: 0000000000000001 R09: 1ffff10039c29cd1 [ 42.831327] R10: ffff8801ce236140 R11: fffffbfff0e01326 R12: 1ffff10039c29d48 [ 42.838563] R13: 00000000ffffff01 R14: 0000000000000100 R15: ffff8801d29b8ae4 [ 42.845810] ? refcount_sub_and_test+0x167/0x1b0 [ 42.850529] ? refcount_inc+0x50/0x50 [ 42.854295] ? __sctp_outq_teardown+0xa5b/0x1230 [ 42.859019] ? sctp_association_free+0x2d0/0x930 [ 42.863737] ? sctp_do_sm+0x271b/0x6a30 [ 42.867674] ? sctp_primitive_SHUTDOWN+0xa0/0xd0 [ 42.872391] ? sctp_close+0x3c6/0x980 [ 42.876157] ? inet_release+0xed/0x1c0 [ 42.880008] ? inet6_release+0x50/0x70 [ 42.883860] ? sock_release+0x8d/0x1e0 [ 42.887712] sctp_wfree+0x183/0x620 [ 42.891304] ? entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.896198] ? __sctp_write_space+0x910/0x910 [ 42.900660] skb_release_head_state+0x124/0x200 [ 42.905295] skb_release_all+0x15/0x60 [ 42.909146] consume_skb+0x153/0x490 [ 42.912825] ? sctp_chunk_put+0x99/0x420 [ 42.916852] ? alloc_skb_with_frags+0x750/0x750 [ 42.921486] ? sctp_chunk_hold+0x20/0x20 [ 42.925510] ? sctp_sched_dequeue_common+0x2aa/0x5d0 [ 42.930577] ? refcount_sub_and_test+0x115/0x1b0 [ 42.935297] ? refcount_inc+0x50/0x50 [ 42.939062] ? trace_hardirqs_off+0xd/0x10 [ 42.943262] ? quarantine_put+0xeb/0x190 [ 42.947295] sctp_chunk_put+0x29c/0x420 [ 42.951234] ? sctp_chunk_hold+0x20/0x20 [ 42.955266] ? sctp_transport_dst_confirm+0x50/0x50 [ 42.960251] ? sctp_sched_fcfs_dequeue+0x198/0x290 [ 42.965145] ? sctp_sched_dequeue_common+0x5d0/0x5d0 [ 42.970214] sctp_chunk_free+0x53/0x60 [ 42.974067] __sctp_outq_teardown+0xa5b/0x1230 [ 42.978616] ? sctp_inq_set_th_handler+0x1b0/0x1b0 [ 42.983513] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 42.988672] ? lock_downgrade+0x990/0x990 [ 42.992784] ? workingset_activation+0x272/0x390 [ 42.997508] ? trace_hardirqs_on+0xd/0x10 [ 43.001625] ? free_hot_cold_page_list+0x101/0x470 [ 43.006521] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 43.011680] ? lock_acquire+0x1d5/0x580 [ 43.015621] ? sock_def_wakeup+0x1f9/0x350 [ 43.019820] ? lock_downgrade+0x990/0x990 [ 43.023932] ? del_timer+0xdf/0x130 [ 43.027527] ? lock_acquire+0x1d5/0x580 [ 43.031470] ? sk_dst_check+0x560/0x560 [ 43.035417] ? lock_release+0xd70/0xd70 [ 43.039355] ? trace_raw_output_tick_stop+0x130/0x130 [ 43.044510] sctp_outq_free+0x15/0x20 [ 43.048277] sctp_association_free+0x2d0/0x930 [ 43.052823] ? refcount_inc+0x50/0x50 [ 43.056591] ? sctp_asconf_queue_teardown+0x700/0x700 [ 43.061746] ? sock_def_wakeup+0x222/0x350 [ 43.065948] ? sk_dst_check+0x560/0x560 [ 43.069888] ? sctp_association_put+0x74/0x2f0 [ 43.074435] ? sctp_association_hold+0x20/0x20 [ 43.078982] ? lock_release+0xd70/0xd70 [ 43.082922] sctp_do_sm+0x271b/0x6a30 [ 43.086688] ? trace_raw_output_xdp_redirect_map_err+0x440/0x440 [ 43.092801] ? sctp_do_8_2_transport_strike.isra.16+0x8a0/0x8a0 [ 43.098829] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 43.104000] ? rcutorture_record_progress+0x10/0x10 [ 43.108983] ? lock_acquire+0x1d5/0x580 [ 43.112926] ? skb_dequeue+0x12a/0x180 [ 43.116778] ? lock_downgrade+0x990/0x990 [ 43.120890] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 43.126047] ? lock_acquire+0x1d5/0x580 [ 43.129985] ? skb_dequeue+0x22/0x180 [ 43.133755] ? do_raw_spin_trylock+0x190/0x190 [ 43.138303] ? lock_release+0xd70/0xd70 [ 43.142245] ? trace_hardirqs_on+0xd/0x10 [ 43.146360] sctp_primitive_SHUTDOWN+0xa0/0xd0 [ 43.150907] sctp_close+0x3c6/0x980 [ 43.154505] ? sctp_apply_peer_addr_params+0xf30/0xf30 [ 43.159747] ? unwind_get_return_address+0x61/0xa0 [ 43.164642] ? __save_stack_trace+0x7e/0xd0 [ 43.168932] ? depot_save_stack+0x12c/0x490 [ 43.173222] ? free_fs_struct+0x52/0x60 [ 43.177165] ? ipv6_sock_ac_close+0x2e8/0x3e0 [ 43.181628] ? ipv6_sock_mc_close+0x148/0x1a0 [ 43.186090] ? ip_mc_drop_socket+0x1ce/0x230 [ 43.190464] ? __fsnotify_parent+0xb4/0x3a0 [ 43.194751] inet_release+0xed/0x1c0 [ 43.198430] inet6_release+0x50/0x70 [ 43.202127] sock_release+0x8d/0x1e0 [ 43.205806] ? sock_release+0x1e0/0x1e0 [ 43.209746] sock_close+0x16/0x20 [ 43.213165] __fput+0x333/0x7f0 [ 43.216413] ? fput+0x140/0x140 [ 43.219659] ? do_raw_spin_trylock+0x190/0x190 [ 43.224208] ____fput+0x15/0x20 [ 43.227452] task_work_run+0x199/0x270 [ 43.231306] ? task_work_cancel+0x210/0x210 [ 43.235592] ? _raw_spin_unlock+0x22/0x30 [ 43.239706] ? switch_task_namespaces+0x87/0xc0 [ 43.244341] do_exit+0x9d2/0x1af0 [ 43.247758] ? get_unused_fd_flags+0x190/0x190 [ 43.252307] ? mm_update_next_owner+0x930/0x930 [ 43.256941] ? lock_release+0xd70/0xd70 [ 43.260880] ? check_same_owner+0x320/0x320 [ 43.265165] ? __might_fault+0x110/0x1d0 [ 43.269192] ? lock_downgrade+0x990/0x990 [ 43.273309] ? __might_sleep+0x95/0x190 [ 43.277251] ? __fd_install+0x2f7/0x6a0 [ 43.281194] ? get_unused_fd_flags+0x190/0x190 [ 43.285743] ? __might_sleep+0x95/0x190 [ 43.289685] ? kasan_check_read+0x11/0x20 [ 43.293799] ? _copy_to_user+0xa2/0xc0 [ 43.297656] ? fd_install+0x4d/0x60 [ 43.301247] ? SYSC_accept4+0x4f2/0x850 [ 43.305187] ? __release_sock+0x360/0x360 [ 43.309303] ? kernel_accept+0x2f0/0x2f0 [ 43.313330] ? sctp_inet_listen+0x141/0x850 [ 43.317619] ? sctp_transport_get_idx+0x70/0x70 [ 43.322256] ? selinux_socket_listen+0x36/0x40 [ 43.326803] ? security_socket_listen+0x81/0xb0 [ 43.331439] do_group_exit+0x149/0x400 [ 43.335291] ? SyS_bind+0x30/0x30 [ 43.338708] ? SyS_exit+0x30/0x30 [ 43.342130] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.346851] SyS_exit_group+0x1d/0x20 [ 43.350617] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 43.355337] RIP: 0033:0x43e9d8 [ 43.358492] RSP: 002b:00007fff345b2d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.366165] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9d8 [ 43.373401] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 43.380636] RBP: 00000000006ca018 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 43.387870] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401700 [ 43.395106] R13: 0000000000401790 R14: 0000000000000000 R15: 0000000000000000 [ 43.402386] Dumping ftrace buffer: [ 43.405891] (ftrace buffer empty) [ 43.409566] Kernel Offset: disabled [ 43.413162] Rebooting in 86400 seconds..