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Date: Sun, 24 Jul 2022 16:11:02 +0800
From: kernel test robot <oliver.sang@...el.com>
To: "Jason A. Donenfeld" <Jason@...c4.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<aliyunlinux2-dev@...ux.alibaba.com>, <jane.lv@...el.com>,
<linux-kernel@...r.kernel.org>, <lkp@...ts.01.org>, <lkp@...el.com>
Subject: [random] 3d1f971aa8:
WARNING:possible_circular_locking_dependency_detected
Greeting,
FYI, we noticed the following commit (built with gcc-11):
commit: 3d1f971aa81f830d2c86a781960800ebb4347601 ("random: move initialization functions out of hot pages")
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
in testcase: trinity
version: trinity-static-i386-x86_64-f93256fb_2019-08-28
with following parameters:
runtime: 300s
group: group-02
test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/
on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>
[ 18.287691] WARNING: possible circular locking dependency detected
[ 18.287692] 4.19.248-00165-g3d1f971aa81f #1 Not tainted
[ 18.287693] ------------------------------------------------------
[ 18.287712] stop/202 is trying to acquire lock:
[ 18.287713] (ptrval) (console_owner){..-.}, at: console_unlock (??:?)
[ 18.287717]
[ 18.287718] but task is already holding lock:
[ 18.287718] (ptrval) (&(&port->lock)->rlock){-...}, at: pty_write (pty.c:?)
[ 18.287722]
[ 18.287722] which lock already depends on the new lock.
[ 18.287723]
[ 18.287724]
[ 18.287725] the existing dependency chain (in reverse order) is:
[ 18.287725]
[ 18.287726] -> #2 (&(&port->lock)->rlock){-...}:
[ 18.287729] validate_chain+0x84a/0xe00
[ 18.287729] __lock_acquire (lockdep.c:?)
[ 18.287730] lock_acquire (??:?)
[ 18.287731] _raw_spin_lock_irqsave (??:?)
[ 18.287732] tty_port_tty_get (??:?)
[ 18.287733] tty_port_default_wakeup (tty_port.c:?)
[ 18.287734] tty_port_tty_wakeup (??:?)
[ 18.287734] uart_write_wakeup (??:?)
[ 18.287735] serial8250_tx_chars (??:?)
[ 18.287736] serial8250_handle_irq (??:?)
[ 18.287737] serial8250_default_handle_irq (8250_port.c:?)
[ 18.287738] serial8250_interrupt (8250_core.c:?)
[ 18.287738] __handle_irq_event_percpu (??:?)
[ 18.287739] handle_irq_event_percpu (??:?)
[ 18.287740] handle_irq_event (??:?)
[ 18.287741] handle_edge_irq (??:?)
[ 18.287742] handle_irq (??:?)
[ 18.287742] do_IRQ (??:?)
[ 18.287743] common_interrupt (entry_32.o:?)
[ 18.287744] _raw_spin_unlock_irqrestore (??:?)
[ 18.287745] uart_write (serial_core.c:?)
[ 18.287746] process_output_block (n_tty.c:?)
[ 18.287747] n_tty_write (n_tty.c:?)
[ 18.287747] tty_write (tty_io.c:?)
[ 18.287748] __vfs_write (??:?)
[ 18.287749] vfs_write (??:?)
[ 18.287750] ksys_write (??:?)
[ 18.287750] sys_write (??:?)
[ 18.287751] do_fast_syscall_32 (??:?)
[ 18.287752] entry_SYSENTER_32 (??:?)
[ 18.287752]
[ 18.287753] -> #1 (&port_lock_key){-.-.}:
[ 18.287756]
[ 18.287756] -> #0 (console_owner){..-.}:
[ 18.287759] check_prevs_add (lockdep.c:?)
[ 18.287760] validate_chain+0x84a/0xe00
[ 18.287761] __lock_acquire (lockdep.c:?)
[ 18.287761] lock_acquire (??:?)
[ 18.287762] console_unlock (??:?)
[ 18.287763] vprintk_emit (??:?)
[ 18.287764] vprintk_default (??:?)
[ 18.287764] vprintk_func (??:?)
[ 18.287765] printk (??:?)
[ 18.287766] get_random_u32 (??:?)
[ 18.287767] shuffle_freelist (slub.c:?)
[ 18.287767] allocate_slab (slub.c:?)
[ 18.287768] new_slab (slub.c:?)
[ 18.287769] ___slab_alloc+0x6d0/0xb20
[ 18.287770] __slab_alloc+0xd6/0x2e0
[ 18.287770] __kmalloc (??:?)
[ 18.287771] tty_buffer_alloc (tty_buffer.c:?)
[ 18.287772] __tty_buffer_request_room (tty_buffer.c:?)
[ 18.287773] tty_insert_flip_string_fixed_flag (??:?)
[ 18.287774] pty_write (pty.c:?)
[ 18.287775] process_output_block (n_tty.c:?)
[ 18.287776] n_tty_write (n_tty.c:?)
[ 18.287777] tty_write (tty_io.c:?)
[ 18.287778] __vfs_write (??:?)
[ 18.287779] vfs_write (??:?)
[ 18.287780] ksys_write (??:?)
[ 18.287780] sys_write (??:?)
[ 18.287781] do_fast_syscall_32 (??:?)
[ 18.287782] entry_SYSENTER_32 (??:?)
[ 18.287783]
[ 18.287783] other info that might help us debug this:
[ 18.287784]
[ 18.287785] Chain exists of:
[ 18.287785] console_owner --> &port_lock_key --> &(&port->lock)->rlock
[ 18.287789]
[ 18.287790] Possible unsafe locking scenario:
[ 18.287790]
[ 18.287791] CPU0 CPU1
[ 18.287792] ---- ----
[ 18.287792] lock(&(&port->lock)->rlock);
[ 18.287794] lock(&port_lock_key);
[ 18.287814] lock(&(&port->lock)->rlock);
[ 18.287815] lock(console_owner);
[ 18.287817]
[ 18.287818] *** DEADLOCK ***
[ 18.287818]
[ 18.287819] 6 locks held by stop/202:
[ 18.287820] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read (??:?)
[ 18.287823] #1: (ptrval) (&tty->atomic_write_lock){+.+.}, at: tty_write_lock (tty_io.c:?)
[ 18.287826] #2: (ptrval) (&o_tty->termios_rwsem/1){++++}, at: n_tty_write (n_tty.c:?)
[ 18.287830] #3: (ptrval) (&ldata->output_lock){+.+.}, at: process_output_block (n_tty.c:?)
[ 18.287834] #4: (ptrval) (&(&port->lock)->rlock){-...}, at: pty_write (pty.c:?)
[ 18.287838] #5: (ptrval) (console_lock){+.+.}, at: console_trylock_spinning (printk.c:?)
[ 18.287841]
[ 18.287842] stack backtrace:
[ 18.287843] CPU: 0 PID: 202 Comm: stop Not tainted 4.19.248-00165-g3d1f971aa81f #1
[ 18.287843] Call Trace:
[ 18.287844] dump_stack (??:?)
[ 18.287845] print_circular_bug.cold+0x78/0x8b
[ 18.287846] check_prev_add+0x66a/0xd20
[ 18.287847] check_prevs_add (lockdep.c:?)
[ 18.287848] validate_chain+0x84a/0xe00
[ 18.287848] __lock_acquire (lockdep.c:?)
[ 18.287849] lock_acquire (??:?)
[ 18.287850] ? console_unlock (??:?)
[ 18.287851] console_unlock (??:?)
[ 18.287851] ? console_unlock (??:?)
[ 18.287852] ? native_save_fl (??:?)
[ 18.287853] vprintk_emit (??:?)
[ 18.287854] vprintk_default (??:?)
[ 18.287855] vprintk_func (??:?)
[ 18.287855] printk (??:?)
[ 18.287856] get_random_u32 (??:?)
[ 18.287857] ? shuffle_freelist (slub.c:?)
[ 18.287858] shuffle_freelist (slub.c:?)
[ 18.287858] ? page_address (??:?)
[ 18.287859] allocate_slab (slub.c:?)
[ 18.287860] new_slab (slub.c:?)
[ 18.287861] ? pvclock_clocksource_read (??:?)
[ 18.287862] ___slab_alloc+0x6d0/0xb20
[ 18.287862] ? kvm_sched_clock_read (kvmclock.c:?)
[ 18.287863] ? __slab_alloc+0xbc/0x2e0
[ 18.287864] ? native_wbinvd (paravirt.c:?)
[ 18.287865] __slab_alloc+0xd6/0x2e0
[ 18.287865] __kmalloc (??:?)
[ 18.287866] ? __lock_acquire (lockdep.c:?)
[ 18.287867] ? tty_buffer_alloc (tty_buffer.c:?)
[ 18.287868] tty_buffer_alloc (tty_buffer.c:?)
[ 18.287869] __tty_buffer_request_room (tty_buffer.c:?)
[ 18.287869] tty_insert_flip_string_fixed_flag (??:?)
[ 18.287870] pty_write (pty.c:?)
[ 18.287871] process_output_block (n_tty.c:?)
[ 18.287872] n_tty_write (n_tty.c:?)
[ 18.287873] ? print_dl_stats (??:?)
[ 18.287874] ? n_tty_ioctl (n_tty.c:?)
[ 18.287874] tty_write (tty_io.c:?)
[ 18.287875] ? n_tty_ioctl (n_tty.c:?)
[ 18.287876] ? tty_write_unlock (tty_io.c:?)
[ 18.287877] __vfs_write (??:?)
[ 18.287877] vfs_write (??:?)
[ 18.287878] ? __fget_light (file.c:?)
[ 18.287879] ksys_write (??:?)
To reproduce:
# build kernel
cd linux
cp config-4.19.248-00165-g3d1f971aa81f .config
make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
cd <mod-install-dir>
find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
# if come across any failure that blocks the test,
# please remove ~/.lkp and /lkp dir to run from a clean state.
--
0-DAY CI Kernel Test Service
https://01.org/lkp
View attachment "config-4.19.248-00165-g3d1f971aa81f" of type "text/plain" (113240 bytes)
View attachment "job-script" of type "text/plain" (4587 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (59628 bytes)
View attachment "trinity" of type "text/plain" (29344 bytes)
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