./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1352451638 <...> Warning: Permanently added '10.128.0.181' (ECDSA) to the list of known hosts. execve("./syz-executor1352451638", ["./syz-executor1352451638"], 0x7ffee88d7f10 /* 10 vars */) = 0 brk(NULL) = 0x555555a6a000 brk(0x555555a6ac40) = 0x555555a6ac40 arch_prctl(ARCH_SET_FS, 0x555555a6a300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 set_tid_address(0x555555a6a5d0) = 5007 set_robust_list(0x555555a6a5e0, 24) = 0 rt_sigaction(SIGRTMIN, {sa_handler=0x7f6af41c2c10, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f6af41c32e0}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7f6af41c2cb0, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f6af41c32e0}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1352451638", 4096) = 28 brk(0x555555a8bc40) = 0x555555a8bc40 brk(0x555555a8c000) = 0x555555a8c000 mprotect(0x7f6af4283000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 futex(0x7f6af428940c, FUTEX_WAKE_PRIVATE, 1000000) = 0 mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f6af4193000 mprotect(0x7f6af4194000, 131072, PROT_READ|PROT_WRITE) = 0 clone(child_stack=0x7f6af41b33f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 5008 attached , parent_tid=[5008], tls=0x7f6af41b3700, child_tidptr=0x7f6af41b39d0) = 5008 [pid 5008] set_robust_list(0x7f6af41b39e0, 24) = 0 [pid 5008] futex(0x7f6af4289408, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5007] futex(0x7f6af4289408, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5008] <... futex resumed>) = 0 [pid 5008] pipe( [pid 5007] futex(0x7f6af428940c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5008] <... pipe resumed>[3, 4]) = 0 [pid 5008] futex(0x7f6af428940c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5007] <... futex resumed>) = 0 [pid 5007] futex(0x7f6af4289408, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5007] futex(0x7f6af428940c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5008] pipe2([5, 6], O_EXCL) = 0 [pid 5008] futex(0x7f6af428940c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5007] <... futex resumed>) = 0 [pid 5007] futex(0x7f6af4289408, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5007] futex(0x7f6af428940c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5008] splice(3, NULL, 6, NULL, 4, 0 [pid 5007] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [pid 5007] futex(0x7f6af428941c, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5007] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f6af4172000 [pid 5007] mprotect(0x7f6af4173000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 5007] clone(child_stack=0x7f6af41923f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 5009 attached , parent_tid=[5009], tls=0x7f6af4192700, child_tidptr=0x7f6af41929d0) = 5009 [pid 5007] futex(0x7f6af4289418, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5007] futex(0x7f6af428941c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5009] set_robust_list(0x7f6af41929e0, 24) = 0 [pid 5009] write(4, "\xda", 1) = 1 [pid 5009] futex(0x7f6af428941c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5009] futex(0x7f6af4289418, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5007] <... futex resumed>) = 0 [pid 5007] futex(0x7f6af4289418, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5007] futex(0x7f6af428941c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5009] <... futex resumed>) = 0 [pid 5009] write(-1, NULL, 0) = -1 EBADF (Bad file descriptor) [pid 5009] futex(0x7f6af428941c, FUTEX_WAKE_PRIVATE, 1000000 [pid 5007] <... futex resumed>) = 0 [pid 5009] <... futex resumed>) = 1 syzkaller login: [ 80.676859][ T5008] [ 80.679260][ T5008] ============================================ [ 80.685454][ T5008] WARNING: possible recursive locking detected [ 80.691680][ T5008] 6.4.0-rc2-syzkaller #0 Not tainted [ 80.696981][ T5008] -------------------------------------------- [ 80.703316][ T5008] syz-executor135/5008 is trying to acquire lock: [ 80.709746][ T5008] ffff88802bfa2868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_write+0x140/0x1ca0 [ 80.718762][ T5008] [ 80.718762][ T5008] but task is already holding lock: [ 80.726159][ T5008] ffff88802c797468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x39f/0x420 [ 80.735605][ T5008] [ 80.735605][ T5008] other info that might help us debug this: [ 80.743765][ T5008] Possible unsafe locking scenario: [ 80.743765][ T5008] [ 80.751223][ T5008] CPU0 [ 80.754523][ T5008] ---- [ 80.757810][ T5008] lock(&pipe->mutex/1); [ 80.762166][ T5008] lock(&pipe->mutex/1); [ 80.766523][ T5008] [ 80.766523][ T5008] *** DEADLOCK *** [ 80.766523][ T5008] [ 80.774674][ T5008] May be due to missing lock nesting notation [ 80.774674][ T5008] [ 80.783089][ T5008] 1 lock held by syz-executor135/5008: [ 80.788557][ T5008] #0: ffff88802c797468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_wait_readable+0x39f/0x420 [ 80.798538][ T5008] [ 80.798538][ T5008] stack backtrace: [ 80.804528][ T5008] CPU: 0 PID: 5008 Comm: syz-executor135 Not tainted 6.4.0-rc2-syzkaller #0 [ 80.813232][ T5008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 [ 80.823302][ T5008] Call Trace: [ 80.826593][ T5008] [ 80.829534][ T5008] dump_stack_lvl+0xd9/0x150 [ 80.834184][ T5008] __lock_acquire+0x13b3/0x5df0 [ 80.839071][ T5008] ? print_usage_bug.part.0+0x660/0x660 [ 80.844739][ T5008] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 80.850764][ T5008] ? __lock_acquire+0x1916/0x5df0 [ 80.855855][ T5008] lock_acquire+0x1b1/0x520 [ 80.860484][ T5008] ? pipe_write+0x140/0x1ca0 [ 80.865117][ T5008] ? lock_sync+0x190/0x190 [ 80.869575][ T5008] __mutex_lock+0x12f/0x1350 [ 80.874193][ T5008] ? pipe_write+0x140/0x1ca0 [ 80.879063][ T5008] ? pipe_write+0x140/0x1ca0 [ 80.883672][ T5008] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 80.889249][ T5008] ? find_held_lock+0x2d/0x110 [ 80.894041][ T5008] ? aa_file_perm+0x568/0x1250 [ 80.898923][ T5008] ? lock_downgrade+0x690/0x690 [ 80.903807][ T5008] pipe_write+0x140/0x1ca0 [ 80.908256][ T5008] ? aa_file_perm+0x592/0x1250 [ 80.913055][ T5008] ? do_proc_dopipe_max_size_conv+0x1c0/0x1c0 [ 80.919142][ T5008] ? aa_path_link+0x2f0/0x2f0 [ 80.923858][ T5008] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 80.929427][ T5008] ? pipe_wait_readable+0x33a/0x420 [ 80.934652][ T5008] ? lock_downgrade+0x690/0x690 [ 80.939555][ T5008] ? _raw_spin_lock_irqsave+0x52/0x60 [ 80.944965][ T5008] do_iter_readv_writev+0x20b/0x3b0 [ 80.950200][ T5008] ? generic_copy_file_range+0x1d0/0x1d0 [ 80.955875][ T5008] ? bpf_lsm_file_permission+0x9/0x10 [ 80.961283][ T5008] ? security_file_permission+0xaf/0xd0 [ 80.966857][ T5008] do_iter_write+0x185/0x7e0 [ 80.971492][ T5008] vfs_iter_write+0x74/0xa0 [ 80.976033][ T5008] iter_file_splice_write+0x743/0xc80 [ 80.981491][ T5008] ? page_cache_pipe_buf_confirm+0x5b0/0x5b0 [ 80.987602][ T5008] ? __lock_acquire+0xbe1/0x5df0 [ 80.992619][ T5008] ? bpf_lsm_file_permission+0x9/0x10 [ 80.998055][ T5008] ? security_file_permission+0xaf/0xd0 [ 81.003635][ T5008] ? page_cache_pipe_buf_confirm+0x5b0/0x5b0 [ 81.009657][ T5008] do_splice+0xb8c/0x1e50 [ 81.014985][ T5008] ? find_held_lock+0x2d/0x110 [ 81.019927][ T5008] ? splice_file_to_pipe+0x120/0x120 [ 81.025333][ T5008] ? pipe_to_sendpage+0x380/0x380 [ 81.030572][ T5008] __do_splice+0x14e/0x270 [ 81.035038][ T5008] ? do_splice+0x1e50/0x1e50 [ 81.039675][ T5008] __x64_sys_splice+0x19c/0x250 [ 81.044547][ T5008] do_syscall_64+0x39/0xb0 [ 81.049002][ T5008] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 81.055016][ T5008] RIP: 0033:0x7f6af4200c79 [ 81.059448][ T5008] 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 [ 81.079075][ T5008] RSP: 002b:00007f6af41b3308 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 81.087551][ T5008] RAX: ffffffffffffffda RBX: 00007f6af4289408 RCX: 00007f6af4200c79 [ 81.095542][ T5008] RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000003 [ 81.103563][ T5008] RBP: 00007f6af4289400 R08: 0000000000000004 R09: 0000000000000000 [ 81.111723][ T5008] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6af4257004 [ 81.119721][ T5008] R13: 00007ffe00d1757f R14: 00007f6af41b3400 R15: 0000000000022000 [pid 5009] futex(0x7f6af4289418, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5008] <... splice resumed>) = -1 EXDEV (Invalid cross-device link) [pid 5008] futex(0x7f6af428940c, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5008] futex(0x7f6af4289408, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5007] exit_group(0) = ? [pid 5008] <... futex resumed>) = ? [pid 5008] +++ exited with 0 +++ [pid 5009] <... futex resumed>) = ? [pid 5009] +++ exited with 0 +++ +++ exited with 0 +++ [ 81.127719