| Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|
| possible deadlock in ovl_write_iter overlayfs | C | 222 | 1808d | 2031d | 0/26 | closed as dup on 2019/02/12 15:47 |
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| Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|
| possible deadlock in ovl_write_iter overlayfs | C | 222 | 1808d | 2031d | 0/26 | closed as dup on 2019/02/12 15:47 |
| Title | Replies (including bot) | Last reply |
|---|---|---|
| possible deadlock in pipe_lock (2) | 12 (13) | 2019/02/12 16:11 |
| Kernel | Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|
| upstream | possible deadlock in pipe_lock fs | 50806 | 2314d | 2362d | 0/26 | closed as invalid on 2018/02/14 14:20 | |||
| upstream | possible deadlock in pipe_lock (4) overlayfs | 1 | 1081d | 1077d | 0/26 | auto-closed as invalid on 2021/07/03 13:02 | |||
| linux-4.19 | possible deadlock in pipe_lock (2) | C | error | 155 | 409d | 1576d | 0/1 | upstream: reported C repro on 2019/12/26 07:17 | |
| upstream | possible deadlock in pipe_lock (5) overlayfs | C | done | 5 | 1000d | 999d | 20/26 | fixed on 2021/11/10 00:50 | |
| android-49 | possible deadlock in pipe_lock | 5 | 1639d | 1832d | 0/3 | auto-closed as invalid on 2020/02/21 12:40 | |||
| linux-4.19 | possible deadlock in pipe_lock | C | done | 2 | 1818d | 1821d | 1/1 | fixed on 2019/11/29 10:34 | |
| android-44 | possible deadlock in pipe_lock | C | 82 | 1599d | 1832d | 0/2 | public: reported C repro on 2019/04/14 08:51 | ||
| upstream | possible deadlock in pipe_lock (3) overlayfs | C | inconclusive | done | 4 | 1538d | 1575d | 15/26 | fixed on 2020/08/18 22:40 |
======================================================
WARNING: possible circular locking dependency detected
5.1.0-rc5+ #78 Not tainted
------------------------------------------------------
syz-executor.0/6771 is trying to acquire lock:
00000000b1c51315 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline]
00000000b1c51315 (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70
but task is already holding lock:
0000000041406b3c (sb_writers#5){.+.+}, at: file_start_write include/linux/fs.h:2825 [inline]
0000000041406b3c (sb_writers#5){.+.+}, at: do_splice+0xe23/0x1420 fs/splice.c:1153
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (sb_writers#5){.+.+}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
percpu_down_read include/linux/percpu-rwsem.h:36 [inline]
__sb_start_write+0x20b/0x360 fs/super.c:1613
sb_start_write include/linux/fs.h:1621 [inline]
mnt_want_write+0x3f/0xc0 fs/namespace.c:358
ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24
ovl_create_object+0xb3/0x2c0 fs/overlayfs/dir.c:599
ovl_create+0x28/0x30 fs/overlayfs/dir.c:630
lookup_open+0x12e0/0x1b10 fs/namei.c:3232
do_last fs/namei.c:3322 [inline]
path_openat+0x14ac/0x46e0 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3563
do_sys_open+0x3fe/0x5d0 fs/open.c:1069
ksys_open include/linux/syscalls.h:1373 [inline]
__do_sys_creat fs/open.c:1127 [inline]
__se_sys_creat fs/open.c:1125 [inline]
__x64_sys_creat+0x61/0x80 fs/open.c:1125
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #3 (&ovl_i_mutex_dir_key[depth]){++++}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
down_read+0x3b/0x90 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:782 [inline]
do_last fs/namei.c:3321 [inline]
path_openat+0x1e98/0x46e0 fs/namei.c:3533
do_filp_open+0x1a1/0x280 fs/namei.c:3563
do_open_execat+0x137/0x690 fs/exec.c:856
__do_execve_file.isra.0+0x178d/0x23f0 fs/exec.c:1758
do_execveat_common fs/exec.c:1865 [inline]
do_execveat fs/exec.c:1893 [inline]
__do_sys_execveat fs/exec.c:1969 [inline]
__se_sys_execveat fs/exec.c:1961 [inline]
__x64_sys_execveat+0xed/0x130 fs/exec.c:1961
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #2 (&sig->cred_guard_mutex){+.+.}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
__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:388
proc_pid_syscall+0x8a/0x220 fs/proc/base.c:623
proc_single_show+0xf6/0x170 fs/proc/base.c:744
seq_read+0x4db/0x1130 fs/seq_file.c:229
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x4a9/0x660 fs/read_write.c:922
vfs_readv+0xf0/0x160 fs/read_write.c:984
kernel_readv fs/splice.c:358 [inline]
default_file_splice_read+0x475/0x890 fs/splice.c:413
do_splice_to+0x12a/0x190 fs/splice.c:876
splice_direct_to_actor+0x2d2/0x970 fs/splice.c:953
do_splice_direct+0x1da/0x2a0 fs/splice.c:1062
do_sendfile+0x597/0xd00 fs/read_write.c:1443
__do_sys_sendfile64 fs/read_write.c:1504 [inline]
__se_sys_sendfile64 fs/read_write.c:1490 [inline]
__x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1490
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (&p->lock){+.+.}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
__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
seq_read+0x71/0x1130 fs/seq_file.c:161
proc_reg_read+0x1fe/0x2c0 fs/proc/inode.c:227
do_loop_readv_writev fs/read_write.c:701 [inline]
do_loop_readv_writev fs/read_write.c:688 [inline]
do_iter_read+0x4a9/0x660 fs/read_write.c:922
vfs_readv+0xf0/0x160 fs/read_write.c:984
kernel_readv fs/splice.c:358 [inline]
default_file_splice_read+0x475/0x890 fs/splice.c:413
do_splice_to+0x12a/0x190 fs/splice.c:876
do_splice+0x110b/0x1420 fs/splice.c:1183
__do_sys_splice fs/splice.c:1424 [inline]
__se_sys_splice fs/splice.c:1404 [inline]
__x64_sys_splice+0x2c6/0x330 fs/splice.c:1404
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&pipe->mutex/1){+.+.}:
check_prevs_add kernel/locking/lockdep.c:2333 [inline]
validate_chain kernel/locking/lockdep.c:2714 [inline]
__lock_acquire+0x239c/0x3fb0 kernel/locking/lockdep.c:3701
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
__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_nested fs/pipe.c:62 [inline]
pipe_lock+0x6e/0x80 fs/pipe.c:70
iter_file_splice_write+0x18b/0xbe0 fs/splice.c:696
do_splice_from fs/splice.c:847 [inline]
do_splice+0x70a/0x1420 fs/splice.c:1154
__do_sys_splice fs/splice.c:1424 [inline]
__se_sys_splice fs/splice.c:1404 [inline]
__x64_sys_splice+0x2c6/0x330 fs/splice.c:1404
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
&pipe->mutex/1 --> &ovl_i_mutex_dir_key[depth] --> sb_writers#5
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_writers#5);
lock(&ovl_i_mutex_dir_key[depth]);
lock(sb_writers#5);
lock(&pipe->mutex/1);
*** DEADLOCK ***
1 lock held by syz-executor.0/6771:
#0: 0000000041406b3c (sb_writers#5){.+.+}, at: file_start_write include/linux/fs.h:2825 [inline]
#0: 0000000041406b3c (sb_writers#5){.+.+}, at: do_splice+0xe23/0x1420 fs/splice.c:1153
stack backtrace:
CPU: 1 PID: 6771 Comm: syz-executor.0 Not tainted 5.1.0-rc5+ #78
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:1571
check_prev_add.constprop.0+0xf11/0x23c0 kernel/locking/lockdep.c:2220
check_prevs_add kernel/locking/lockdep.c:2333 [inline]
validate_chain kernel/locking/lockdep.c:2714 [inline]
__lock_acquire+0x239c/0x3fb0 kernel/locking/lockdep.c:3701
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
__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_nested fs/pipe.c:62 [inline]
pipe_lock+0x6e/0x80 fs/pipe.c:70
iter_file_splice_write+0x18b/0xbe0 fs/splice.c:696
do_splice_from fs/splice.c:847 [inline]
do_splice+0x70a/0x1420 fs/splice.c:1154
__do_sys_splice fs/splice.c:1424 [inline]
__se_sys_splice fs/splice.c:1404 [inline]
__x64_sys_splice+0x2c6/0x330 fs/splice.c:1404
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3a57911c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458c29
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3a579126d4
R13: 00000000004c7d06 R14: 00000000004dd340 R15: 00000000ffffffff
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019/04/21 15:01 | upstream | 9e5de623a0cb | b0e8efcb | .config | console log | report | ci-upstream-kasan-gce-smack-root | |||||
| 2019/04/17 19:30 | upstream | fe5cdef29e41 | b0e8efcb | .config | console log | report | ci-upstream-kasan-gce-selinux-root | |||||
| 2019/02/08 19:03 | upstream | 74e96711e337 | fa6c7b70 | .config | console log | report | ci-upstream-kasan-gce-root |