forked to background, child pid 3172 no interfaces have a carrier [ 26.226814][ T3173] 8021q: adding VLAN 0 to HW filter on device bond0 [ 26.242838][ T3173] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.948030][ T3596] [ 48.950382][ T3596] ============================================ [ 48.956511][ T3596] WARNING: possible recursive locking detected [ 48.962637][ T3596] 5.17.0-rc6-next-20220303-syzkaller #0 Not tainted [ 48.969198][ T3596] -------------------------------------------- [ 48.975321][ T3596] syz-executor335/3596 is trying to acquire lock: [ 48.981708][ T3596] ffff88807f045068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x132/0x1c00 [ 48.990552][ T3596] [ 48.990552][ T3596] but task is already holding lock: [ 48.997907][ T3596] ffff88807f045468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x39b/0x420 [ 49.007281][ T3596] [ 49.007281][ T3596] other info that might help us debug this: [ 49.015315][ T3596] Possible unsafe locking scenario: [ 49.015315][ T3596] [ 49.022827][ T3596] CPU0 [ 49.026084][ T3596] ---- [ 49.029341][ T3596] lock(&pipe->mutex/1); [ 49.033652][ T3596] lock(&pipe->mutex/1); [ 49.037961][ T3596] [ 49.037961][ T3596] *** DEADLOCK *** [ 49.037961][ T3596] [ 49.046083][ T3596] May be due to missing lock nesting notation [ 49.046083][ T3596] [ 49.054378][ T3596] 1 lock held by syz-executor335/3596: [ 49.059818][ T3596] #0: ffff88807f045468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x39b/0x420 [ 49.069657][ T3596] [ 49.069657][ T3596] stack backtrace: [ 49.075527][ T3596] CPU: 1 PID: 3596 Comm: syz-executor335 Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 [ 49.085498][ T3596] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.095540][ T3596] Call Trace: [ 49.098807][ T3596] [ 49.101727][ T3596] dump_stack_lvl+0xcd/0x134 [ 49.106319][ T3596] __lock_acquire.cold+0x12c/0x3a7 [ 49.111436][ T3596] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 49.117418][ T3596] lock_acquire+0x1ab/0x510 [ 49.121918][ T3596] ? pipe_write+0x132/0x1c00 [ 49.126510][ T3596] ? lock_release+0x720/0x720 [ 49.131187][ T3596] __mutex_lock+0x12f/0x12f0 [ 49.135768][ T3596] ? pipe_write+0x132/0x1c00 [ 49.140354][ T3596] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 49.146331][ T3596] ? pipe_write+0x132/0x1c00 [ 49.150918][ T3596] ? mutex_lock_io_nested+0x1150/0x1150 [ 49.156464][ T3596] ? find_held_lock+0x2d/0x110 [ 49.161223][ T3596] ? aa_file_perm+0x56b/0x1230 [ 49.165994][ T3596] ? lock_downgrade+0x6e0/0x6e0 [ 49.170841][ T3596] pipe_write+0x132/0x1c00 [ 49.175257][ T3596] ? aa_file_perm+0x595/0x1230 [ 49.180025][ T3596] ? do_proc_dopipe_max_size_conv+0x1c0/0x1c0 [ 49.186091][ T3596] ? aa_path_link+0x2f0/0x2f0 [ 49.190759][ T3596] ? mutex_lock_io_nested+0x1150/0x1150 [ 49.196298][ T3596] ? pipe_wait_readable+0x336/0x420 [ 49.201531][ T3596] ? lock_downgrade+0x6e0/0x6e0 [ 49.206380][ T3596] do_iter_readv_writev+0x47a/0x750 [ 49.211579][ T3596] ? new_sync_write+0x660/0x660 [ 49.216445][ T3596] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 49.222692][ T3596] ? security_file_permission+0xab/0xd0 [ 49.228241][ T3596] do_iter_write+0x188/0x710 [ 49.232838][ T3596] vfs_iter_write+0x70/0xa0 [ 49.237346][ T3596] iter_file_splice_write+0x723/0xc70 [ 49.242732][ T3596] ? page_cache_pipe_buf_confirm+0x5a0/0x5a0 [ 49.248717][ T3596] ? __lock_acquire+0xbca/0x56c0 [ 49.253660][ T3596] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 49.259903][ T3596] ? security_file_permission+0xab/0xd0 [ 49.265450][ T3596] ? page_cache_pipe_buf_confirm+0x5a0/0x5a0 [ 49.271433][ T3596] do_splice+0xb7e/0x1960 [ 49.275761][ T3596] ? find_held_lock+0x2d/0x110 [ 49.280519][ T3596] ? __fget_files+0x26a/0x470 [ 49.285197][ T3596] ? splice_file_to_pipe+0x120/0x120 [ 49.290479][ T3596] ? find_held_lock+0x2d/0x110 [ 49.295235][ T3596] __do_splice+0x134/0x250 [ 49.299651][ T3596] ? do_splice+0x1960/0x1960 [ 49.304239][ T3596] __x64_sys_splice+0x198/0x250 [ 49.309087][ T3596] do_syscall_64+0x35/0xb0 [ 49.313505][ T3596] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 49.319395][ T3596] RIP: 0033:0x7f4847816ca9 [ 49.323798][ T3596] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 [ 49.343399][ T3596] RSP: 002b:00007f48477c9308 EFLAGS: 00000246 ORIG_RAX: