| Title | Replies (including bot) | Last reply |
|---|---|---|
| possible deadlock in lock_trace (2) | 0 (1) | 2019/04/17 16:46 |
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| Title | Replies (including bot) | Last reply |
|---|---|---|
| possible deadlock in lock_trace (2) | 0 (1) | 2019/04/17 16:46 |
| Kernel | Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| linux-4.19 | possible deadlock in lock_trace | 4 | syz | error | 42 | 1880d | 2385d | 0/1 | upstream: reported syz repro on 2019/04/28 18:16 | |
| linux-4.14 | possible deadlock in lock_trace | 4 | C | error | 146 | 1937d | 2395d | 0/1 | upstream: reported C repro on 2019/04/19 09:51 | |
| android-49 | possible deadlock in lock_trace | 4 | C | 7424 | 2166d | 2402d | 0/3 | public: reported C repro on 2019/04/12 00:00 | ||
| upstream | possible deadlock in lock_trace fs | 4 | C | 1847 | 2418d | 2899d | 0/29 | closed as dup on 2017/12/12 21:59 | ||
| upstream | possible deadlock in lock_trace (3) fs | 4 | syz | inconclusive | done | 69 | 2046d | 2181d | 15/29 | fixed on 2020/08/18 22:40 |
| android-414 | possible deadlock in lock_trace | 4 | syz | 203 | 2411d | 2402d | 0/1 | public: reported syz repro on 2019/04/12 00:01 | ||
| android-44 | possible deadlock in lock_trace | 4 | C | 41 | 2173d | 2403d | 0/2 | public: reported C repro on 2019/04/11 08:44 |
======================================================
WARNING: possible circular locking dependency detected
5.1.0-rc5+ #71 Not tainted
------------------------------------------------------
syz-executor.5/9344 is trying to acquire lock:
000000002573c5cd (&sig->cred_guard_mutex){+.+.}, at: lock_trace+0x4a/0xe0 fs/proc/base.c:388
but task is already holding lock:
00000000e68fae9b (&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:
-> #3 (&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
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
-> #2 (sb_writers#4){.+.+}:
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_rename+0x22b/0x1940 fs/overlayfs/dir.c:1079
vfs_rename+0x803/0x1ac0 fs/namei.c:4475
do_renameat2+0xb0f/0xc40 fs/namei.c:4625
__do_sys_rename fs/namei.c:4671 [inline]
__se_sys_rename fs/namei.c:4669 [inline]
__x64_sys_rename+0x61/0x80 fs/namei.c:4669
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #1 (&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_execve fs/exec.c:1882 [inline]
__do_sys_execve fs/exec.c:1958 [inline]
__se_sys_execve fs/exec.c:1953 [inline]
__x64_sys_execve+0x8f/0xc0 fs/exec.c:1953
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&sig->cred_guard_mutex){+.+.}:
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_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
other info that might help us debug this:
Chain exists of:
&sig->cred_guard_mutex --> sb_writers#4 --> &p->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&p->lock);
lock(sb_writers#4);
lock(&p->lock);
lock(&sig->cred_guard_mutex);
*** DEADLOCK ***
2 locks held by syz-executor.5/9344:
#0: 000000003ef5ac57 (sb_writers#7){.+.+}, at: file_start_write include/linux/fs.h:2825 [inline]
#0: 000000003ef5ac57 (sb_writers#7){.+.+}, at: do_sendfile+0x9b9/0xd00 fs/read_write.c:1442
#1: 00000000e68fae9b (&p->lock){+.+.}, at: seq_read+0x71/0x1130 fs/seq_file.c:161
stack backtrace:
CPU: 0 PID: 9344 Comm: syz-executor.5 Not tainted 5.1.0-rc5+ #71
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_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
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:00007f9b470bec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f9b470bf6d4
R13: 00000000004c5e10 R14: 00000000004da5c8 R15: 00000000ffffffff
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019/04/17 03:04 | upstream | 444fe9913539 | b0e8efcb | .config | console log | report | ci-upstream-kasan-gce-selinux-root | |||||
| 2019/05/17 15:22 | linux-next | b1d6682ef9bb | 95dfd515 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | |||||
| 2019/05/12 06:19 | linux-next | a802303934b3 | c017728b | .config | console log | report | ci-upstream-linux-next-kasan-gce-root |