====================================================== WARNING: possible circular locking dependency detected kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env 5.0.0-rc6+ #68 Not tainted kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' ------------------------------------------------------ syz-executor.1/13152 is trying to acquire lock: 000000003279bb53 (&sig->cred_guard_mutex){+.+.}, at: lock_trace+0x4a/0xe0 fs/proc/base.c:384 but task is already holding lock: 000000006c164852 (&p->lock){+.+.}, at: seq_read+0x71/0x1130 fs/seq_file.c:161 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seq_read+0x71/0x1130 fs/seq_file.c:161 proc_reg_read+0x1fa/0x2c0 fs/proc/inode.c:229 do_loop_readv_writev fs/read_write.c:700 [inline] do_loop_readv_writev fs/read_write.c:687 [inline] do_iter_read+0x4a9/0x660 fs/read_write.c:921 vfs_readv+0xf0/0x160 fs/read_write.c:983 kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x475/0x890 fs/splice.c:417 do_splice_to+0x12a/0x190 fs/splice.c:880 do_splice+0xf7c/0x1330 fs/splice.c:1178 __do_sys_splice fs/splice.c:1419 [inline] __se_sys_splice fs/splice.c:1399 [inline] __ia32_sys_splice+0x2c4/0x330 fs/splice.c:1399 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 -> #1 (&pipe->mutex/1){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __pipe_lock fs/pipe.c:83 [inline] fifo_open+0x159/0xb00 fs/pipe.c:905 do_dentry_open+0x47d/0x1130 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x10d7/0x4690 fs/namei.c:3534 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_open_execat+0x13b/0x6d0 fs/exec.c:856 __do_execve_file.isra.0+0x178d/0x23f0 fs/exec.c:1758 do_execveat_common fs/exec.c:1865 [inline] compat_do_execve fs/exec.c:1909 [inline] __do_compat_sys_execve fs/exec.c:1984 [inline] __se_compat_sys_execve fs/exec.c:1980 [inline] __ia32_compat_sys_execve+0x94/0xc0 fs/exec.c:1980 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 -> #0 (&sig->cred_guard_mutex){+.+.}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102 lock_trace+0x4a/0xe0 fs/proc/base.c:384 proc_pid_syscall+0x98/0x250 fs/proc/base.c:619 proc_single_show+0xf6/0x180 fs/proc/base.c:739 seq_read+0x4db/0x1130 fs/seq_file.c:229 do_loop_readv_writev fs/read_write.c:700 [inline] do_loop_readv_writev fs/read_write.c:687 [inline] do_iter_read+0x4a9/0x660 fs/read_write.c:921 vfs_readv+0xf0/0x160 fs/read_write.c:983 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x475/0x890 fs/splice.c:417 do_splice_to+0x12a/0x190 fs/splice.c:880 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:957 do_splice_direct+0x1da/0x2a0 fs/splice.c:1066 do_sendfile+0x597/0xd00 fs/read_write.c:1436 __do_compat_sys_sendfile fs/read_write.c:1518 [inline] __se_compat_sys_sendfile fs/read_write.c:1501 [inline] __ia32_compat_sys_sendfile+0x1f1/0x230 fs/read_write.c:1501 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 other info that might help us debug this: Chain exists of: &sig->cred_guard_mutex --> &pipe->mutex/1 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(&pipe->mutex/1); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 1 lock held by syz-executor.1/13152: #0: 000000006c164852 (&p->lock){+.+.}, at: seq_read+0x71/0x1130 fs/seq_file.c:161 stack backtrace: CPU: 1 PID: 13152 Comm: syz-executor.1 Not tainted 5.0.0-rc6+ #68 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2350 [inline] __lock_acquire+0x2f00/0x4700 kernel/locking/lockdep.c:3338 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102 lock_trace+0x4a/0xe0 fs/proc/base.c:384 proc_pid_syscall+0x98/0x250 fs/proc/base.c:619 proc_single_show+0xf6/0x180 fs/proc/base.c:739 seq_read+0x4db/0x1130 fs/seq_file.c:229 do_loop_readv_writev fs/read_write.c:700 [inline] do_loop_readv_writev fs/read_write.c:687 [inline] do_iter_read+0x4a9/0x660 fs/read_write.c:921 vfs_readv+0xf0/0x160 fs/read_write.c:983 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x475/0x890 fs/splice.c:417 do_splice_to+0x12a/0x190 fs/splice.c:880 splice_direct_to_actor+0x2d2/0x970 fs/splice.c:957 do_splice_direct+0x1da/0x2a0 fs/splice.c:1066 do_sendfile+0x597/0xd00 fs/read_write.c:1436 __do_compat_sys_sendfile fs/read_write.c:1518 [inline] __se_compat_sys_sendfile fs/read_write.c:1501 [inline] __ia32_compat_sys_sendfile+0x1f1/0x230 fs/read_write.c:1501 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f7d869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5d790cc EFLAGS: 00000296 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000003 RDX: 0000000000000000 RSI: 0000000000010082 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 kobject: 'loop5' (00000000333d4b92): kobject_uevent_env kobject: 'loop5' (00000000333d4b92): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (00000000333d4b92): kobject_uevent_env kobject: 'loop5' (00000000333d4b92): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (000000005bcbe982): kobject_uevent_env kobject: 'loop4' (000000005bcbe982): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000333d4b92): kobject_uevent_env kobject: 'loop5' (00000000333d4b92): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (000000005bcbe982): kobject_uevent_env kobject: 'loop4' (000000005bcbe982): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000333d4b92): kobject_uevent_env kobject: 'loop5' (00000000333d4b92): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (000000005bcbe982): kobject_uevent_env kobject: 'loop4' (000000005bcbe982): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000025eabaaa): kobject_uevent_env kobject: 'loop0' (0000000025eabaaa): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000333d4b92): kobject_uevent_env kobject: 'loop5' (00000000333d4b92): fill_kobj_path: path = '/devices/virtual/block/loop5'