2017/09/08 21:21:44 parsed 1 programs 2017/09/08 21:21:44 executed programs: 0 syzkaller login: [ 42.942800] refcount_t: underflow; use-after-free. [ 42.943462] ------------[ cut here ]------------ [ 42.943967] WARNING: CPU: 1 PID: 3198 at lib/refcount.c:186 refcount_sub_and_test+0x167/0x1b0 [ 42.945376] Kernel panic - not syncing: panic_on_warn set ... [ 42.945376] [ 42.946270] CPU: 1 PID: 3198 Comm: syz-executor4 Not tainted 4.13.0-next-20170908+ #18 [ 42.947806] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 42.949303] Call Trace: [ 42.949800] dump_stack+0x194/0x257 [ 42.950492] ? arch_local_irq_restore+0x53/0x53 [ 42.951306] panic+0x1e4/0x417 [ 42.951704] ? __warn+0x1d9/0x1d9 [ 42.952523] ? show_regs_print_info+0x65/0x65 [ 42.953020] ? refcount_sub_and_test+0x167/0x1b0 [ 42.953496] __warn+0x1c4/0x1d9 [ 42.953807] ? refcount_sub_and_test+0x167/0x1b0 [ 42.954290] report_bug+0x211/0x2d0 [ 42.954666] fixup_bug+0x40/0x90 [ 42.955005] do_trap+0x260/0x390 [ 42.955375] do_error_trap+0x120/0x390 [ 42.955821] ? do_trap+0x390/0x390 [ 42.956261] ? refcount_sub_and_test+0x167/0x1b0 [ 42.956770] ? vprintk_emit+0x3ea/0x590 [ 42.957207] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.957743] do_invalid_op+0x1b/0x20 [ 42.958179] invalid_op+0x18/0x20 [ 42.958573] RIP: 0010:refcount_sub_and_test+0x167/0x1b0 [ 42.959142] RSP: 0018:ffff88003977e300 EFLAGS: 00010282 [ 42.959717] RAX: 0000000000000026 RBX: 0000000000000001 RCX: 0000000000000000 [ 42.960494] RDX: 0000000000000026 RSI: 1ffff100072efc20 RDI: ffffed00072efc54 [ 42.961308] RBP: ffff88003977e390 R08: ffff88003977d9f0 R09: 0000000000000000 [ 42.962053] R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff100072efc61 [ 42.962849] R13: 00000000ffffff01 R14: 0000000000000100 R15: ffff880068aa92e4 [ 42.964168] ? refcount_inc+0x50/0x50 [ 42.964832] ? __sctp_outq_teardown+0xc7d/0x15a0 [ 42.965651] ? sctp_association_free+0x2d0/0x930 [ 42.966485] ? sctp_do_sm+0x28e7/0x6dd0 [ 42.967210] ? sctp_primitive_SHUTDOWN+0xa0/0xd0 [ 42.968050] ? sctp_close+0x3c6/0x980 [ 42.968723] ? inet_release+0xed/0x1c0 [ 42.969196] sctp_wfree+0x183/0x620 [ 42.969636] ? __sctp_write_space+0x910/0x910 [ 42.970387] skb_release_head_state+0x124/0x200 [ 42.971185] skb_release_all+0x15/0x60 [ 42.971594] consume_skb+0x153/0x490 [ 42.971975] ? sctp_chunk_put+0x99/0x420 [ 42.972401] ? alloc_skb_with_frags+0x710/0x710 [ 42.972858] ? sctp_chunk_hold+0x20/0x20 [ 42.973240] ? refcount_sub_and_test+0x115/0x1b0 [ 42.974028] ? refcount_inc+0x50/0x50 [ 42.974424] ? mark_held_locks+0xb2/0x100 [ 42.974864] ? sctp_datamsg_put+0x456/0x560 [ 42.975348] sctp_chunk_put+0x29c/0x420 [ 42.975754] ? sctp_chunk_hold+0x20/0x20 [ 42.976220] ? sctp_transport_dst_confirm+0x50/0x50 [ 42.976764] sctp_chunk_free+0x53/0x60 [ 42.977174] __sctp_outq_teardown+0xc7d/0x15a0 [ 42.977706] ? inet6_release+0x50/0x70 [ 42.978381] ? sctp_inq_set_th_handler+0x1b0/0x1b0 [ 42.979256] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 42.980155] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 42.981027] ? unwind_dump+0x4c0/0x4c0 [ 42.981714] ? unwind_next_frame.part.6+0x1ae/0xc70 [ 42.982568] ? unwind_dump+0x4c0/0x4c0 [ 42.983209] ? check_noncircular+0x20/0x20 [ 42.983944] ? check_noncircular+0x20/0x20 [ 42.984695] ? unwind_get_return_address+0x61/0xa0 [ 42.985550] ? __save_stack_trace+0x61/0xd0 [ 42.986307] ? check_noncircular+0x20/0x20 [ 42.987071] ? print_usage_bug+0x480/0x480 [ 42.987797] ? find_held_lock+0x39/0x1d0 [ 42.988248] ? lock_downgrade+0x990/0x990 [ 42.988801] ? sk_dst_check+0x560/0x560 [ 42.989494] ? rcu_read_lock_sched_held+0x108/0x120 [ 42.990329] ? lock_release+0xd70/0xd70 [ 42.991032] sctp_outq_free+0x15/0x20 [ 42.991720] sctp_association_free+0x2d0/0x930 [ 42.992511] ? sctp_asconf_queue_teardown+0x700/0x700 [ 42.993403] ? sock_def_wakeup+0x222/0x350 [ 42.994664] ? sk_dst_check+0x560/0x560 [ 42.995323] ? sctp_association_put+0x74/0x2f0 [ 42.995800] ? sctp_association_hold+0x20/0x20 [ 42.996182] ? unwind_dump+0x4c0/0x4c0 [ 42.996473] ? sctp_sm_lookup_event+0x95/0x3c0 [ 42.996843] sctp_do_sm+0x28e7/0x6dd0 [ 42.997206] ? sctp_do_8_2_transport_strike.isra.16+0x8a0/0x8a0 [ 42.997678] ? print_usage_bug+0x480/0x480 [ 42.998017] ? __lock_acquire+0x20fd/0x4620 [ 42.998381] ? print_usage_bug+0x480/0x480 [ 42.998712] ? find_held_lock+0x39/0x1d0 [ 42.999052] ? lock_downgrade+0x990/0x990 [ 42.999447] ? skb_dequeue+0x22/0x180 [ 42.999729] ? do_raw_spin_trylock+0x190/0x190 [ 43.000121] ? mark_held_locks+0xb2/0x100 [ 43.000500] ? trace_hardirqs_on+0xd/0x10 [ 43.000806] sctp_primitive_SHUTDOWN+0xa0/0xd0 [ 43.001243] sctp_close+0x3c6/0x980 [ 43.001661] ? sctp_apply_peer_addr_params+0xf30/0xf30 [ 43.002071] ? unwind_get_return_address+0x61/0xa0 [ 43.002446] ? check_noncircular+0x20/0x20 [ 43.002754] ? depot_save_stack+0x12c/0x490 [ 43.003071] ? ipv6_sock_ac_close+0x2e8/0x3e0 [ 43.003408] ? ipv6_sock_mc_close+0x148/0x1a0 [ 43.003758] ? ipv6_sock_ac_drop+0x580/0x580 [ 43.004074] ? ip_mc_drop_socket+0x1ce/0x230 [ 43.004429] ? __fsnotify_parent+0xb4/0x3a0 [ 43.004770] inet_release+0xed/0x1c0 [ 43.005034] inet6_release+0x50/0x70 [ 43.005339] sock_release+0x8d/0x1e0 [ 43.005615] ? sock_release+0x1e0/0x1e0 [ 43.005934] sock_close+0x16/0x20 [ 43.006190] __fput+0x333/0x7f0 [ 43.006467] ? fput+0x140/0x140 [ 43.006764] ? _raw_spin_unlock_irq+0x27/0x70 [ 43.007225] ____fput+0x15/0x20 [ 43.007495] task_work_run+0x199/0x270 [ 43.007882] ? task_work_cancel+0x210/0x210 [ 43.008286] ? _raw_spin_unlock+0x22/0x30 [ 43.008628] ? switch_task_namespaces+0x87/0xc0 [ 43.008999] do_exit+0xa52/0x1b40 [ 43.009357] ? plist_check_list+0xa0/0xa0 [ 43.009679] ? plist_del+0x47b/0x990 [ 43.009947] ? mm_update_next_owner+0x930/0x930 [ 43.010343] ? plist_add+0x760/0x760 [ 43.010635] ? check_same_owner+0x320/0x320 [ 43.011019] ? find_held_lock+0x39/0x1d0 [ 43.011656] ? check_noncircular+0x20/0x20 [ 43.012058] ? lock_downgrade+0x990/0x990 [ 43.012449] ? refill_pi_state_cache.part.6+0x2f0/0x2f0 [ 43.012979] ? find_held_lock+0x39/0x1d0 [ 43.013366] ? lock_downgrade+0x990/0x990 [ 43.013715] ? recalc_sigpending_tsk+0x117/0x150 [ 43.014182] ? recalc_sigpending+0x103/0x160 [ 43.014569] ? recalc_sigpending_tsk+0x150/0x150 [ 43.015001] ? get_signal+0x397/0x17e0 [ 43.015812] do_group_exit+0x149/0x400 [ 43.016160] ? __lock_is_held+0xbc/0x140 [ 43.016545] ? SyS_exit+0x30/0x30 [ 43.016874] ? _raw_spin_unlock_irq+0x27/0x70 [ 43.017308] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.017767] get_signal+0x7e8/0x17e0 [ 43.018142] ? ptrace_notify+0x130/0x130 [ 43.018518] ? __local_bh_enable_ip+0x9d/0x160 [ 43.018865] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.019329] ? release_sock+0x1d4/0x2a0 [ 43.019678] ? trace_hardirqs_on+0xd/0x10 [ 43.020058] ? exit_robust_list+0x240/0x240 [ 43.020456] ? trace_hardirqs_on+0xd/0x10 [ 43.020844] do_signal+0x94/0x1ee0 [ 43.021177] ? inet_sendmsg+0x11f/0x5e0 [ 43.021525] ? inet_sendmsg+0x126/0x5e0 [ 43.021883] ? __might_sleep+0x95/0x190 [ 43.022257] ? setup_sigcontext+0x7d0/0x7d0 [ 43.022667] ? selinux_socket_sendmsg+0x36/0x40 [ 43.023087] ? security_socket_sendmsg+0x89/0xb0 [ 43.023543] ? inet_recvmsg+0x5f0/0x5f0 [ 43.023867] ? sock_sendmsg+0x4f/0x110 [ 43.024220] ? fput+0xd2/0x140 [ 43.024507] ? SYSC_sendto+0x413/0x5a0 [ 43.024852] ? SYSC_connect+0x480/0x480 [ 43.025217] ? selinux_netlbl_socket_setsockopt+0x10c/0x460 [ 43.025784] ? exit_to_usermode_loop+0x98/0x300 [ 43.026179] exit_to_usermode_loop+0x224/0x300 [ 43.026609] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 43.027120] syscall_return_slowpath+0x42f/0x500 [ 43.027550] ? prepare_exit_to_usermode+0x2c0/0x2c0 [ 43.028001] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 43.028385] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.028740] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.029117] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 43.029603] RIP: 0033:0x447299 [ 43.029933] RSP: 002b:00007fbee2ecacf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 43.030698] RAX: fffffffffffffe00 RBX: 0000000000708238 RCX: 0000000000447299 [ 43.031482] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708238 [ 43.032190] RBP: 0000000000708210 R08: 000000000000001c R09: 0000000000000000 [ 43.032816] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 43.033435] R13: 0000000000000000 R14: 00007fbee2ecb9c0 R15: 00007fbee2ecb700