On Sat, 4 Jun 2022 at 10:46, syzbot <syzbot+6da75abeed821109137b@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 032dcf09e2bf Merge tag 'gpio-fixes-for-v5.19-rc1' of git:/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14409a93f00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=99f457384a4fea79 > dashboard link: https://syzkaller.appspot.com/bug?extid=6da75abeed821109137b > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+6da75abeed821109137b@xxxxxxxxxxxxxxxxxxxxxxxxx +Jason, Laurent This started appearing at the same time as 'task hung in add_early_randomness" bug reports: https://syzkaller.appspot.com/bug?id=256d08cc261a3c38832064a33df4c928b3cd0ef0 https://syzkaller.appspot.com/bug?id=be1d99e09e499aed3939dc678718371984104e5c https://syzkaller.appspot.com/bug?id=1cd11df5d984c694e3e7fc9fe271389b2340bed0 https://syzkaller.appspot.com/bug?id=35496bafab4c3f81f0b0d6d72c69787300629740 Is this also fixed by "virtio-rng: make device ready before making request" patch? > INFO: task swapper/0:1 blocked for more than 143 seconds. > Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:swapper/0 state:D stack:21080 pid: 1 ppid: 0 flags:0x00004000 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5116 [inline] > __schedule+0x957/0xec0 kernel/sched/core.c:6428 > schedule+0xeb/0x1b0 kernel/sched/core.c:6500 > schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6559 > __mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679 > __mutex_lock kernel/locking/mutex.c:747 [inline] > mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 > add_early_randomness drivers/char/hw_random/core.c:69 [inline] > hwrng_register+0x3bf/0x680 drivers/char/hw_random/core.c:599 > virtrng_scan+0x3e/0x90 drivers/char/hw_random/virtio-rng.c:205 > virtio_dev_probe+0xa03/0xba0 drivers/virtio/virtio.c:313 > call_driver_probe+0x96/0x250 > really_probe+0x220/0x940 drivers/base/dd.c:634 > __driver_probe_device+0x1f4/0x3f0 drivers/base/dd.c:764 > driver_probe_device+0x50/0x240 drivers/base/dd.c:794 > __driver_attach+0x35f/0x5a0 drivers/base/dd.c:1163 > bus_for_each_dev+0x188/0x1f0 drivers/base/bus.c:301 > bus_add_driver+0x32f/0x600 drivers/base/bus.c:618 > bus_add_driver+0x32f/0x600 drivers/base/bus.c:618 > driver_register+0x2e9/0x3e0 drivers/base/driver.c:240 > do_one_initcall+0xbd/0x2b0 init/main.c:1295 > do_initcall_level+0x168/0x218 init/main.c:1368 > do_initcalls+0x4b/0x8c init/main.c:1384 > kernel_init_freeable+0x43a/0x5c3 init/main.c:1610 > kernel_init+0x19/0x2b0 init/main.c:1499 > ret_from_fork+0x1f/0x30 > </TASK> > > Showing all locks held in the system: > 2 locks held by swapper/0/1: > #0: ffff8881468d4170 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] > #0: ffff8881468d4170 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1054 [inline] > #0: ffff8881468d4170 (&dev->mutex){....}-{3:3}, at: __driver_attach+0x353/0x5a0 drivers/base/dd.c:1162 > #1: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: add_early_randomness drivers/char/hw_random/core.c:69 [inline] > #1: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: hwrng_register+0x3bf/0x680 drivers/char/hw_random/core.c:599 > 2 locks held by pr/ttyS0/16: > 1 lock held by khungtaskd/29: > #0: ffffffff8cb1eee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 > 2 locks held by kworker/u4:4/56: > #0: ffff888011c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 > #1: ffffc900013e7d00 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 > 1 lock held by hwrng/755: > #0: ffffffff8d24ccc8 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0xec/0x470 drivers/char/hw_random/core.c:503 > > ============================================= > > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000008ea7ac05e09b46a6%40google.com.
