[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.232' (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 syzkaller login: [ 174.422790] syz-executor033 (8136) used greatest stack depth: 23752 bytes left executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 186.336292] [ 186.337963] ====================================================== [ 186.344316] WARNING: possible circular locking dependency detected [ 186.350816] 4.19.184-syzkaller #0 Not tainted [ 186.355366] ------------------------------------------------------ [ 186.362140] syz-executor033/9854 is trying to acquire lock: [ 186.367970] 00000000677b6950 (&p->lock){+.+.}, at: seq_read+0x6b/0x1160 [ 186.374780] [ 186.374780] but task is already holding lock: [ 186.380780] 00000000d744bf39 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 [ 186.388163] [ 186.388163] which lock already depends on the new lock. [ 186.388163] [ 186.396496] [ 186.396496] the existing dependency chain (in reverse order) is: [ 186.404115] [ 186.404115] -> #3 (sb_writers#3){.+.+}: [ 186.409564] mnt_want_write+0x3a/0xb0 [ 186.413875] ovl_create_object+0x96/0x290 [ 186.418532] lookup_open+0x893/0x1a20 [ 186.422838] path_openat+0x1094/0x2df0 [ 186.427236] do_filp_open+0x18c/0x3f0 [ 186.431553] do_sys_open+0x3b3/0x520 [ 186.435778] do_syscall_64+0xf9/0x620 [ 186.440142] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 186.445830] [ 186.445830] -> #2 (&ovl_i_mutex_dir_key[depth]){++++}: [ 186.452574] path_openat+0x17ec/0x2df0 [ 186.456984] do_filp_open+0x18c/0x3f0 [ 186.461328] do_open_execat+0x11d/0x5b0 [ 186.465809] __do_execve_file+0x1a8b/0x2360 [ 186.470663] do_execve+0x35/0x50 [ 186.474545] __x64_sys_execve+0x7c/0xa0 [ 186.479029] do_syscall_64+0xf9/0x620 [ 186.483336] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 186.489026] [ 186.489026] -> #1 (&sig->cred_guard_mutex){+.+.}: [ 186.495442] proc_tgid_io_accounting+0x1cf/0x7f0 [ 186.500716] proc_single_show+0xeb/0x170 [ 186.505306] seq_read+0x4be/0x1160 [ 186.509354] do_iter_read+0x471/0x630 [ 186.513683] vfs_readv+0xe5/0x150 [ 186.517665] default_file_splice_read+0x457/0xa00 [ 186.523029] do_splice_to+0x10e/0x160 [ 186.527353] splice_direct_to_actor+0x2b9/0x8d0 [ 186.532534] do_splice_direct+0x1a7/0x270 [ 186.537422] do_sendfile+0x550/0xc30 [ 186.541907] __se_sys_sendfile64+0x147/0x160 [ 186.546829] do_syscall_64+0xf9/0x620 [ 186.551147] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 186.556854] [ 186.556854] -> #0 (&p->lock){+.+.}: [ 186.561951] __mutex_lock+0xd7/0x1260 [ 186.566460] seq_read+0x6b/0x1160 [ 186.570478] do_iter_read+0x471/0x630 [ 186.574787] vfs_readv+0xe5/0x150 [ 186.578747] default_file_splice_read+0x457/0xa00 [ 186.584617] do_splice_to+0x10e/0x160 [ 186.588963] splice_direct_to_actor+0x2b9/0x8d0 [ 186.594175] do_splice_direct+0x1a7/0x270 [ 186.598841] do_sendfile+0x550/0xc30 [ 186.603070] __se_sys_sendfile64+0x147/0x160 [ 186.607984] do_syscall_64+0xf9/0x620 [ 186.612310] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 186.618034] [ 186.618034] other info that might help us debug this: [ 186.618034] [ 186.626157] Chain exists of: [ 186.626157] &p->lock --> &ovl_i_mutex_dir_key[depth] --> sb_writers#3 [ 186.626157] [ 186.637242] Possible unsafe locking scenario: [ 186.637242] [ 186.643282] CPU0 CPU1 [ 186.647958] ---- ---- [ 186.652640] lock(sb_writers#3); [ 186.656074] lock(&ovl_i_mutex_dir_key[depth]); [ 186.663327] lock(sb_writers#3); [ 186.669282] lock(&p->lock); [ 186.672380] [ 186.672380] *** DEADLOCK *** [ 186.672380] [ 186.678426] 1 lock held by syz-executor033/9854: [ 186.683165] #0: 00000000d744bf39 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 [ 186.690957] [ 186.690957] stack backtrace: [ 186.695451] CPU: 0 PID: 9854 Comm: syz-executor033 Not tainted 4.19.184-syzkaller #0 [ 186.703333] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 186.712828] Call Trace: [ 186.715408] dump_stack+0x1fc/0x2ef [ 186.719027] print_circular_bug.constprop.0.cold+0x2d7/0x41e [ 186.724821] __lock_acquire+0x30c9/0x3ff0 [ 186.729088] ? __kernel_text_address+0x9/0x30 [ 186.733576] ? unwind_get_return_address+0x51/0x90 [ 186.739126] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 186.744493] ? mark_held_locks+0xf0/0xf0 [ 186.748566] ? aa_file_perm+0x3f0/0xd20 [ 186.752551] ? check_preemption_disabled+0x41/0x280 [ 186.757563] ? check_preemption_disabled+0x41/0x280 [ 186.762660] lock_acquire+0x170/0x3c0 [ 186.766452] ? seq_read+0x6b/0x1160 [ 186.770071] ? seq_read+0x6b/0x1160 [ 186.773698] __mutex_lock+0xd7/0x1260 [ 186.777500] ? seq_read+0x6b/0x1160 [ 186.781142] ? lock_acquire+0x170/0x3c0 [ 186.785101] ? check_preemption_disabled+0x41/0x280 [ 186.790101] ? seq_read+0x6b/0x1160 [ 186.793712] ? __mutex_add_waiter+0x160/0x160 [ 186.798199] ? fs_reclaim_release+0xd0/0x110 [ 186.802694] ? fsnotify+0x84e/0xe10 [ 186.806331] ? fsnotify_first_mark+0x200/0x200 [ 186.810909] seq_read+0x6b/0x1160 [ 186.814374] ? security_file_permission+0x1c0/0x220 [ 186.819373] ? rw_verify_area+0x10c/0x330 [ 186.823507] do_iter_read+0x471/0x630 [ 186.827309] vfs_readv+0xe5/0x150 [ 186.830748] ? compat_rw_copy_check_uvector+0x410/0x410 [ 186.836099] ? push_pipe+0x3fe/0x770 [ 186.839799] ? iov_iter_get_pages_alloc+0x339/0x1150 [ 186.844898] ? iov_iter_bvec+0x130/0x130 [ 186.848973] ? lock_downgrade+0x720/0x720 [ 186.853117] ? iov_iter_pipe+0xb4/0x2c0 [ 186.857078] default_file_splice_read+0x457/0xa00 [ 186.861924] ? alloc_pipe_info+0x193/0x470 [ 186.866144] ? do_splice_direct+0x270/0x270 [ 186.870468] ? do_syscall_64+0xf9/0x620 [ 186.874441] ? aa_path_link+0x410/0x410 [ 186.878411] ? mark_held_locks+0xf0/0xf0 [ 186.882475] ? check_preemption_disabled+0x41/0x280 [ 186.887498] ? security_file_permission+0x1c0/0x220 [ 186.892511] ? do_splice_direct+0x270/0x270 [ 186.896835] do_splice_to+0x10e/0x160 [ 186.900795] splice_direct_to_actor+0x2b9/0x8d0 [ 186.905454] ? generic_pipe_buf_nosteal+0x10/0x10 [ 186.910298] ? do_splice_to+0x160/0x160 [ 186.914287] do_splice_direct+0x1a7/0x270 [ 186.918426] ? splice_direct_to_actor+0x8d0/0x8d0 [ 186.923293] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 186.928304] do_sendfile+0x550/0xc30 [ 186.932024] ? do_compat_pwritev64+0x1b0/0x1b0 [ 186.936619] ? __se_sys_futex+0x28f/0x3b0 [ 186.940766] ? __se_sys_futex+0x298/0x3b0 [ 186.944901] __se_sys_sendfile64+0x147/0x160 [ 186.949312] ? __se_sys_sendfile+0x180/0x180 [ 186.953736] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 186.959114] ? trace_hardirqs_off_caller+0x6e/0x210 [ 186.964115] ? do_syscall_64+0x21/0x620 [ 186.968073] do_syscall_64+0xf9/0x620 [ 186.971871] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 186.977045] RIP: 0033:0x4461b9 [ 186.980345] 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 [ 186.999698] RSP: 002b:00007f3ecd851278 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 187.007401] RAX: ffffffffffffffda RBX: 00000000004cb4f0 RCX: 00000000004461b9 [ 187.014674] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 [ 187.021939] RBP: 000000000049b0a8 R08: 65732f636f72702f R09: 65732f636f72702f [ 187.029218] R10: 000000000000f6c1 R11: 0000000000000246 R12: 0030656c69662f2e [ 187.036604] R13: 00007f3ecd851280 R14: 0079616c7265766f R15: 00000000004cb4f8 executing program executing program executing program executing program executing program executing program [ 187.066360] syz-executor033 (9856) used greatest stack depth: 23600 bytes left executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program