syzbot


INFO: task hung in snd_seq_ioctl

Status: auto-closed as invalid on 2019/11/22 23:45
Reported-by: syzbot+db4ebb6e7a940a3f2e04@syzkaller.appspotmail.com
First crash: 1077d, last: 1077d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in snd_seq_ioctl 14 1328d 1409d 0/22 auto-closed as invalid on 2019/05/16 16:34

Sample crash report:
netlink: 20 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'.
INFO: task syz-executor.4:9935 blocked for more than 140 seconds.
      Not tainted 4.14.134 #30
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D30160  9935   7136 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2807 [inline]
 __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383
 schedule+0x92/0x1c0 kernel/sched/core.c:3427
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3485
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 snd_seq_ioctl+0x1a3/0x320 sound/core/seq/seq_clientmgr.c:2135
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007fe4f35f6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000020000740 RSI: 00000000c08c5334 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe4f35f76d4
R13: 00000000004cd800 R14: 00000000004d7750 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1013:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff81483258>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4541
2 locks held by getty/7087:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7088:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7089:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7090:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7091:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7092:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by getty/7093:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff831064f6>] n_tty_read+0x1e6/0x17b0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/7191:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/7207:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7236:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7313:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7337:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7360:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/7380:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7385:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7409:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7423:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7448:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7469:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7502:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/7520:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/7680:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7686:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/7713:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7716:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/7764:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7785:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/7788:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/7792:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7806:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/7828:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/7881:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/7984:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/7996:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8006:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8021:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8026:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8045:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/8046:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8047:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8049:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8060:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8136:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8170:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8190:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8211:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8212:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/8213:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/8216:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8243:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8244:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/8246:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8274:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8277:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/8470:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8491:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8494:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/8499:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8523:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8546:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8600:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8603:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8628:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.5/8652:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8693:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8694:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/8695:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8702:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8719:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8722:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/8752:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8756:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8777:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8841:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/8847:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/8848:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8850:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/8872:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/8880:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/8915:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/8929:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9044:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9049:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9085:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9087:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/9122:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9126:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9161:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/9163:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.0/9225:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9226:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9263:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9276:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9294:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9316:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9322:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9411:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9418:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9438:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9444:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9456:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9473:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9563:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9596:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9715:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9716:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9735:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9770:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.2/9784:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9809:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.1/9842:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
2 locks held by syz-executor.3/9920:
 #0:  (&tty->ldisc_sem){++++}, at: [<ffffffff861b4663>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&tty->atomic_write_lock){+.+.}, at: [<ffffffff830f7db0>] tty_write_lock+0x20/0x60 drivers/tty/tty_io.c:885
1 lock held by syz-executor.4/9935:
 #0:  (&client->ioctl_mutex){+.+.}, at: [<ffffffff84b73133>] snd_seq_ioctl+0x1a3/0x320 sound/core/seq/seq_clientmgr.c:2135

=============================================


Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2019/07/25 23:44 linux-4.14.y ff33472c282e 0d7a1249 .config log report