Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.992830] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. [ 36.289028] [ 36.290664] ===================================================== [ 36.296916] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [ 36.303653] 4.19.189-syzkaller #0 Not tainted [ 36.308129] ----------------------------------------------------- [ 36.314347] syz-executor187/8109 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: [ 36.321681] 00000000ef5245fa (hugetlb_lock){+.+.}, at: free_huge_page+0x482/0xd20 [ 36.329290] [ 36.329290] and this task is already holding: [ 36.335243] 00000000dac182a1 (slock-AF_INET){+.-.}, at: tcp_close+0x5bd/0xfd0 [ 36.342533] which would create a new lock dependency: [ 36.347697] (slock-AF_INET){+.-.} -> (hugetlb_lock){+.+.} [ 36.353321] [ 36.353321] but this new dependency connects a SOFTIRQ-irq-safe lock: [ 36.361380] (slock-AF_INET){+.-.} [ 36.361386] [ 36.361386] ... which became SOFTIRQ-irq-safe at: [ 36.371200] _raw_spin_lock+0x2a/0x40 [ 36.375072] sk_clone_lock+0x40b/0x1430 [ 36.379118] inet_csk_clone_lock+0x1f/0x3e0 [ 36.383504] tcp_create_openreq_child+0x2c/0x19f0 [ 36.388420] tcp_v4_syn_recv_sock+0xb6/0x1030 [ 36.392984] tcp_check_req+0x601/0x1710 [ 36.397047] tcp_v4_rcv+0x1e3c/0x3b80 [ 36.400920] ip_local_deliver_finish+0x495/0xc00 [ 36.405753] ip_local_deliver+0x188/0x500 [ 36.409989] ip_rcv_finish+0x1ca/0x2e0 [ 36.413951] ip_rcv+0xca/0x3c0 [ 36.417212] __netif_receive_skb_one_core+0x114/0x180 [ 36.422485] __netif_receive_skb+0x27/0x1c0 [ 36.426872] netif_receive_skb_internal+0xf0/0x3f0 [ 36.431865] napi_gro_receive+0x2e6/0x450 [ 36.436081] receive_buf+0xb8c/0x65c0 [ 36.439949] virtnet_poll+0x568/0xd70 [ 36.443814] net_rx_action+0x4ac/0xfb0 [ 36.447767] __do_softirq+0x265/0x980 [ 36.451632] run_ksoftirqd+0x57/0x110 [ 36.455498] smpboot_thread_fn+0x655/0x9e0 [ 36.459795] kthread+0x33f/0x460 [ 36.463232] ret_from_fork+0x24/0x30 [ 36.467011] [ 36.467011] to a SOFTIRQ-irq-unsafe lock: [ 36.472610] (hugetlb_lock){+.+.} [ 36.472616] [ 36.472616] ... which became SOFTIRQ-irq-unsafe at: [ 36.482504] ... [ 36.482514] _raw_spin_lock+0x2a/0x40 [ 36.488257] hugetlb_overcommit_handler+0x2d4/0x460 [ 36.493339] proc_sys_call_handler.isra.0+0x1f3/0x3b0 [ 36.498598] __vfs_write+0xf7/0x770 [ 36.502294] vfs_write+0x1f3/0x540 [ 36.505926] ksys_write+0x12b/0x2a0 [ 36.509628] do_syscall_64+0xf9/0x620 [ 36.513495] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.518750] [ 36.518750] other info that might help us debug this: [ 36.518750] [ 36.526871] Possible interrupt unsafe locking scenario: [ 36.526871] [ 36.533775] CPU0 CPU1 [ 36.538418] ---- ---- [ 36.543059] lock(hugetlb_lock); [ 36.546488] local_irq_disable(); [ 36.552518] lock(slock-AF_INET); [ 36.558566] lock(hugetlb_lock); [ 36.564532] [ 36.567263] lock(slock-AF_INET); [ 36.570954] [ 36.570954] *** DEADLOCK *** [ 36.570954] [ 36.577010] 3 locks held by syz-executor187/8109: [ 36.581825] #0: 00000000ea6c226e (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 [ 36.591094] #1: 0000000006cfd8e5 (sk_lock-AF_INET){+.+.}, at: tcp_close+0x25/0xfd0 [ 36.598891] #2: 00000000dac182a1 (slock-AF_INET){+.-.}, at: tcp_close+0x5bd/0xfd0 [ 36.606587] [ 36.606587] the dependencies between SOFTIRQ-irq-safe lock and the holding lock: [ 36.615588] -> (slock-AF_INET){+.-.} ops: 6629 { [ 36.620348] HARDIRQ-ON-W at: [ 36.623612] _raw_spin_lock_bh+0x2f/0x40 [ 36.629304] lock_sock_nested+0x3b/0x110 [ 36.635010] inet_autobind+0x1a/0x190 [ 36.640443] inet_dgram_connect+0x245/0x2d0 [ 36.646394] __sys_connect+0x265/0x2c0 [ 36.651916] __x64_sys_connect+0x6f/0xb0 [ 36.657613] do_syscall_64+0xf9/0x620 [ 36.663151] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.669965] IN-SOFTIRQ-W at: [ 36.673226] _raw_spin_lock+0x2a/0x40 [ 36.678656] sk_clone_lock+0x40b/0x1430 [ 36.684280] inet_csk_clone_lock+0x1f/0x3e0 [ 36.690230] tcp_create_openreq_child+0x2c/0x19f0 [ 36.696702] tcp_v4_syn_recv_sock+0xb6/0x1030 [ 36.702860] tcp_check_req+0x601/0x1710 [ 36.708467] tcp_v4_rcv+0x1e3c/0x3b80 [ 36.713897] ip_local_deliver_finish+0x495/0xc00 [ 36.720306] ip_local_deliver+0x188/0x500 [ 36.726189] ip_rcv_finish+0x1ca/0x2e0 [ 36.731726] ip_rcv+0xca/0x3c0 [ 36.736560] __netif_receive_skb_one_core+0x114/0x180 [ 36.743378] __netif_receive_skb+0x27/0x1c0 [ 36.749328] netif_receive_skb_internal+0xf0/0x3f0 [ 36.755888] napi_gro_receive+0x2e6/0x450 [ 36.761671] receive_buf+0xb8c/0x65c0 [ 36.767099] virtnet_poll+0x568/0xd70 [ 36.772530] net_rx_action+0x4ac/0xfb0 [ 36.778046] __do_softirq+0x265/0x980 [ 36.783485] run_ksoftirqd+0x57/0x110 [ 36.789254] smpboot_thread_fn+0x655/0x9e0 [ 36.795128] kthread+0x33f/0x460 [ 36.800128] ret_from_fork+0x24/0x30 [ 36.805469] INITIAL USE at: [ 36.808665] _raw_spin_lock_bh+0x2f/0x40 [ 36.814276] lock_sock_nested+0x3b/0x110 [ 36.819880] inet_autobind+0x1a/0x190 [ 36.825228] inet_dgram_connect+0x245/0x2d0 [ 36.831263] __sys_connect+0x265/0x2c0 [ 36.836698] __x64_sys_connect+0x6f/0xb0 [ 36.842304] do_syscall_64+0xf9/0x620 [ 36.847651] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.854377] } [ 36.856163] ... key at: [] af_family_slock_keys+0x10/0x1a0 [ 36.863846] ... acquired at: [ 36.866931] _raw_spin_lock+0x2a/0x40 [ 36.870886] free_huge_page+0x482/0xd20 [ 36.875025] __put_page+0xe2/0x3a0 [ 36.878725] skb_release_data+0x2f3/0x920 [ 36.883033] __kfree_skb+0x46/0x60 [ 36.886734] tcp_write_queue_purge+0x24d/0x800 [ 36.891468] tcp_v4_destroy_sock+0x101/0x770 [ 36.896054] inet_csk_destroy_sock+0x189/0x400 [ 36.900838] tcp_close+0x95f/0xfd0 [ 36.904533] inet_release+0xd7/0x1e0 [ 36.908400] __sock_release+0xcd/0x2a0 [ 36.912442] sock_close+0x15/0x20 [ 36.916047] __fput+0x2ce/0x890 [ 36.919478] task_work_run+0x148/0x1c0 [ 36.923583] do_exit+0xbf3/0x2be0 [ 36.927191] do_group_exit+0x125/0x310 [ 36.931232] get_signal+0x3f2/0x1f70 [ 36.935104] do_signal+0x8f/0x1670 [ 36.938798] exit_to_usermode_loop+0x204/0x2a0 [ 36.943531] do_syscall_64+0x538/0x620 [ 36.947589] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.952930] [ 36.954537] [ 36.954537] the dependencies between the lock to be acquired [ 36.954540] and SOFTIRQ-irq-unsafe lock: [ 36.965930] -> (hugetlb_lock){+.+.} ops: 38 { [ 36.970406] HARDIRQ-ON-W at: [ 36.973671] _raw_spin_lock+0x2a/0x40 [ 36.979105] hugetlb_overcommit_handler+0x2d4/0x460 [ 36.985757] proc_sys_call_handler.isra.0+0x1f3/0x3b0 [ 36.992579] __vfs_write+0xf7/0x770 [ 36.997844] vfs_write+0x1f3/0x540 [ 37.003021] ksys_write+0x12b/0x2a0 [ 37.008281] do_syscall_64+0xf9/0x620 [ 37.013717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.020532] SOFTIRQ-ON-W at: [ 37.023834] _raw_spin_lock+0x2a/0x40 [ 37.029284] hugetlb_overcommit_handler+0x2d4/0x460 [ 37.035931] proc_sys_call_handler.isra.0+0x1f3/0x3b0 [ 37.042758] __vfs_write+0xf7/0x770 [ 37.048016] vfs_write+0x1f3/0x540 [ 37.053186] ksys_write+0x12b/0x2a0 [ 37.058442] do_syscall_64+0xf9/0x620 [ 37.063876] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.070689] INITIAL USE at: [ 37.073866] _raw_spin_lock+0x2a/0x40 [ 37.079222] hugetlb_overcommit_handler+0x2d4/0x460 [ 37.085792] proc_sys_call_handler.isra.0+0x1f3/0x3b0 [ 37.092529] __vfs_write+0xf7/0x770 [ 37.097700] vfs_write+0x1f3/0x540 [ 37.102784] ksys_write+0x12b/0x2a0 [ 37.107963] do_syscall_64+0xf9/0x620 [ 37.113314] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.120040] } [ 37.121827] ... key at: [] hugetlb_lock+0x18/0x17a0 [ 37.128989] ... acquired at: [ 37.132077] _raw_spin_lock+0x2a/0x40 [ 37.136033] free_huge_page+0x482/0xd20 [ 37.140157] __put_page+0xe2/0x3a0 [ 37.143941] skb_release_data+0x2f3/0x920 [ 37.148242] __kfree_skb+0x46/0x60 [ 37.151933] tcp_write_queue_purge+0x24d/0x800 [ 37.156665] tcp_v4_destroy_sock+0x101/0x770 [ 37.161247] inet_csk_destroy_sock+0x189/0x400 [ 37.165986] tcp_close+0x95f/0xfd0 [ 37.169680] inet_release+0xd7/0x1e0 [ 37.173577] __sock_release+0xcd/0x2a0 [ 37.177638] sock_close+0x15/0x20 [ 37.181245] __fput+0x2ce/0x890 [ 37.184677] task_work_run+0x148/0x1c0 [ 37.188732] do_exit+0xbf3/0x2be0 [ 37.192354] do_group_exit+0x125/0x310 [ 37.196394] get_signal+0x3f2/0x1f70 [ 37.200262] do_signal+0x8f/0x1670 [ 37.203955] exit_to_usermode_loop+0x204/0x2a0 [ 37.208689] do_syscall_64+0x538/0x620 [ 37.212730] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.218066] [ 37.219671] [ 37.219671] stack backtrace: [ 37.224153] CPU: 0 PID: 8109 Comm: syz-executor187 Not tainted 4.19.189-syzkaller #0 [ 37.232011] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.241342] Call Trace: [ 37.243929] dump_stack+0x1fc/0x2ef [ 37.247537] check_usage.cold+0x7ea/0xbad [ 37.251671] ? check_usage_backwards+0x300/0x300 [ 37.256409] ? lock_downgrade+0x720/0x720 [ 37.260538] ? lock_acquire+0x170/0x3c0 [ 37.264496] __lock_acquire+0x1da1/0x3ff0 [ 37.268627] ? trace_hardirqs_off+0x64/0x200 [ 37.273026] ? mark_held_locks+0xf0/0xf0 [ 37.277070] ? __kasan_slab_free+0x186/0x1f0 [ 37.281481] ? tcp_write_queue_purge+0x24d/0x800 [ 37.286217] ? tcp_v4_destroy_sock+0x101/0x770 [ 37.290779] ? inet_csk_destroy_sock+0x189/0x400 [ 37.295532] ? tcp_close+0x95f/0xfd0 [ 37.299225] ? inet_release+0xd7/0x1e0 [ 37.303092] ? __sock_release+0xcd/0x2a0 [ 37.307131] ? sock_close+0x15/0x20 [ 37.310740] ? task_work_run+0x148/0x1c0 [ 37.314789] ? do_exit+0xbf3/0x2be0 [ 37.318394] ? do_group_exit+0x125/0x310 [ 37.322433] ? get_signal+0x3f2/0x1f70 [ 37.326300] ? exit_to_usermode_loop+0x204/0x2a0 [ 37.331035] ? do_syscall_64+0x538/0x620 [ 37.335078] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.340426] lock_acquire+0x170/0x3c0 [ 37.344210] ? free_huge_page+0x482/0xd20 [ 37.348339] ? PageHuge+0xc7/0x160 [ 37.351861] _raw_spin_lock+0x2a/0x40 [ 37.355644] ? free_huge_page+0x482/0xd20 [ 37.359774] free_huge_page+0x482/0xd20 [ 37.363729] ? PageHuge+0xc7/0x160 [ 37.367250] __put_page+0xe2/0x3a0 [ 37.370780] skb_release_data+0x2f3/0x920 [ 37.374920] __kfree_skb+0x46/0x60 [ 37.378440] tcp_write_queue_purge+0x24d/0x800 [ 37.383006] tcp_v4_destroy_sock+0x101/0x770 [ 37.387394] inet_csk_destroy_sock+0x189/0x400 [ 37.391956] tcp_close+0x95f/0xfd0 [ 37.395483] inet_release+0xd7/0x1e0 [ 37.399188] __sock_release+0xcd/0x2a0 [ 37.403056] ? __sock_release+0x2a0/0x2a0 [ 37.407191] sock_close+0x15/0x20 [ 37.410630] __fput+0x2ce/0x890 [ 37.413903] task_work_run+0x148/0x1c0 [ 37.417794] do_exit+0xbf3/0x2be0 [ 37.421245] ? futex_wake+0x159/0x480 [ 37.425025] ? release_sock+0x1b/0x1b0 [ 37.428895] ? mm_update_next_owner+0x650/0x650 [ 37.433566] ? get_signal+0x388/0x1f70 [ 37.437437] ? lock_downgrade+0x720/0x720 [ 37.441572] ? lock_acquire+0x170/0x3c0 [ 37.445548] do_group_exit+0x125/0x310 [ 37.449416] get_signal+0x3f2/0x1f70 [ 37.453110] ? __local_bh_enable_ip+0x159/0x270 [ 37.457759] ? inet_sendmsg+0x13a/0x5a0 [ 37.461715] ? security_socket_sendmsg+0x83/0xb0 [ 37.466454] do_signal+0x8f/0x1670 [ 37.469977] ? __ia32_sys_getpeername+0xb0/0xb0 [ 37.474648] ? setup_sigcontext+0x820/0x820 [ 37.478977] ? aa_af_perm+0x230/0x230 [ 37.482764] ? __se_sys_futex+0x28f/0x3b0 [ 37.486891] ? __se_sys_futex+0x298/0x3b0 [ 37.491020] ? do_futex+0x18a0/0x18a0 [ 37.494802] ? exit_to_usermode_loop+0x36/0x2a0 [ 37.499451] exit_to_usermode_loop+0x204/0x2a0 [ 37.504014] do_syscall_64+0x538/0x620 [ 37.507911] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.513132] RIP: 0033:0x44d639 [ 37.516311] Code: Bad RIP value. [ 37.519654] RSP: 002b:00007f8a5f2bb2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 37.527345] RAX: fffffffffffffe00 RBX: 00000000004cb410 RCX: 000000000044d639 [ 37.534596] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cb418 executing program [ 37.541931] RBP: 00000000004cb41c R08: 0000000000000000 R09: 0000000000000000 [ 37.549180] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000049b6b0 [ 37.556429] R13: 000000000049b2e8 R14: 0000000020000900 R15: 00000000004cb418 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program