[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 207.840006] [ 207.841661] ====================================================== [ 207.847967] WARNING: possible circular locking dependency detected [ 207.854286] 4.19.211-syzkaller #0 Not tainted [ 207.858766] ------------------------------------------------------ [ 207.865072] syz-executor900/9986 is trying to acquire lock: [ 207.870801] 000000009fe59e73 (&pipe->mutex/1){+.+.}, at: pipe_lock+0x63/0x80 [ 207.877996] [ 207.877996] but task is already holding lock: [ 207.883958] 00000000d69d1fc4 (sb_writers#3){.+.+}, at: __se_sys_splice+0x11de/0x16d0 [ 207.891844] [ 207.891844] which lock already depends on the new lock. [ 207.891844] [ 207.900179] [ 207.900179] the existing dependency chain (in reverse order) is: [ 207.907827] [ 207.907827] -> #2 (sb_writers#3){.+.+}: [ 207.913293] ovl_write_iter+0x932/0xb40 [ 207.917773] __vfs_write+0x51b/0x770 [ 207.921990] __kernel_write+0x109/0x370 [ 207.926467] write_pipe_buf+0x153/0x1f0 [ 207.930952] __splice_from_pipe+0x389/0x800 [ 207.935773] default_file_splice_write+0xd8/0x180 [ 207.941117] __se_sys_splice+0xfe7/0x16d0 [ 207.945766] do_syscall_64+0xf9/0x620 [ 207.950066] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 207.955747] [ 207.955747] -> #1 (&ovl_i_mutex_key[depth]){+.+.}: [ 207.962138] ovl_write_iter+0x148/0xb40 [ 207.966613] __vfs_write+0x51b/0x770 [ 207.970830] __kernel_write+0x109/0x370 [ 207.975301] write_pipe_buf+0x153/0x1f0 [ 207.979774] __splice_from_pipe+0x389/0x800 [ 207.984606] default_file_splice_write+0xd8/0x180 [ 207.989946] __se_sys_splice+0xfe7/0x16d0 [ 207.994597] do_syscall_64+0xf9/0x620 [ 207.998910] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 208.004601] [ 208.004601] -> #0 (&pipe->mutex/1){+.+.}: [ 208.010213] __mutex_lock+0xd7/0x1190 [ 208.014528] pipe_lock+0x63/0x80 [ 208.018391] iter_file_splice_write+0x183/0xbb0 [ 208.023560] __se_sys_splice+0xfe7/0x16d0 [ 208.028215] do_syscall_64+0xf9/0x620 [ 208.032524] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 208.038230] [ 208.038230] other info that might help us debug this: [ 208.038230] [ 208.046358] Chain exists of: [ 208.046358] &pipe->mutex/1 --> &ovl_i_mutex_key[depth] --> sb_writers#3 [ 208.046358] [ 208.057612] Possible unsafe locking scenario: [ 208.057612] [ 208.063644] CPU0 CPU1 [ 208.068286] ---- ---- [ 208.072933] lock(sb_writers#3); [ 208.076362] lock(&ovl_i_mutex_key[depth]); [ 208.083267] lock(sb_writers#3); [ 208.089229] lock(&pipe->mutex/1); [ 208.092832] [ 208.092832] *** DEADLOCK *** [ 208.092832] [ 208.098867] 1 lock held by syz-executor900/9986: [ 208.103591] #0: 00000000d69d1fc4 (sb_writers#3){.+.+}, at: __se_sys_splice+0x11de/0x16d0 [ 208.111895] [ 208.111895] stack backtrace: [ 208.116375] CPU: 1 PID: 9986 Comm: syz-executor900 Not tainted 4.19.211-syzkaller #0 [ 208.124231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 208.133562] Call Trace: [ 208.136130] dump_stack+0x1fc/0x2ef [ 208.139740] print_circular_bug.constprop.0.cold+0x2d7/0x41e [ 208.145542] __lock_acquire+0x30c9/0x3ff0 [ 208.149672] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 208.154756] ? mark_held_locks+0xf0/0xf0 [ 208.158796] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 208.163358] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 208.168439] ? kasan_kmalloc+0x139/0x160 [ 208.172479] ? __kmalloc+0x15a/0x3c0 [ 208.176173] ? __se_sys_splice+0xfe7/0x16d0 [ 208.180490] ? do_syscall_64+0xf9/0x620 [ 208.184445] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 208.189787] lock_acquire+0x170/0x3c0 [ 208.193583] ? pipe_lock+0x63/0x80 [ 208.197102] ? pipe_lock+0x63/0x80 [ 208.200619] __mutex_lock+0xd7/0x1190 [ 208.204416] ? pipe_lock+0x63/0x80 [ 208.207933] ? pipe_lock+0x63/0x80 [ 208.211458] ? mutex_trylock+0x1a0/0x1a0 [ 208.215503] ? fs_reclaim_release+0xd0/0x110 [ 208.219893] ? lock_acquire+0x170/0x3c0 [ 208.223851] ? check_preemption_disabled+0x41/0x280 [ 208.228847] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 208.233841] pipe_lock+0x63/0x80 [ 208.237190] iter_file_splice_write+0x183/0xbb0 [ 208.241835] ? mark_held_locks+0xf0/0xf0 [ 208.245874] ? __fget+0x32f/0x510 [ 208.249306] ? common_file_perm+0x4e5/0x850 [ 208.253604] ? splice_from_pipe_next.part.0+0x360/0x360 [ 208.258945] ? apparmor_getprocattr+0x11e0/0x11e0 [ 208.263763] ? __fget+0x356/0x510 [ 208.267193] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 208.272193] ? splice_from_pipe_next.part.0+0x360/0x360 [ 208.277536] __se_sys_splice+0xfe7/0x16d0 [ 208.281673] ? do_futex+0x1880/0x1880 [ 208.285448] ? __se_sys_tee+0xb90/0xb90 [ 208.289403] ? trace_hardirqs_off_caller+0x6e/0x210 [ 208.294399] ? do_syscall_64+0x21/0x620 [ 208.298367] do_syscall_64+0xf9/0x620 [ 208.302151] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 208.307318] RIP: 0033:0x7fa7693b62e9 [ 208.311025] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 208.329905] RSP: 002b:00007fa7693462e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 executing program executing program executing program executing program executing program executing program [ 208.337590] RAX: ffffffffffffffda RBX: 00007fa76943f4d0 RCX: 00007fa7693b62e9 [ 208.344852] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000004 [ 208.352100] RBP: 00007fa76940c088 R08: 0000000000000015 R09: 0000000000000000 [ 208.359351] R10: 0000000000000000 R11: 0000000000000246 R12: 0079616c7265766f [ 208.366616] R13: 0030656c69662f2e R14: 752e303030325039 R15: 00007fa76943f4d8 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 executing program executing program executing program