kvm [17339]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0xffff8000 kvm [17347]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0x186 data 0xffff8000 INFO: task syz-executor0:17299 blocked for more than 140 seconds. Not tainted 4.20.0+ #175 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D23080 17299 16899 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 blkdev_put+0x34/0x540 fs/block_dev.c:1842 blkdev_close+0x8b/0xb0 fs/block_dev.c:1891 __fput+0x385/0xa50 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411c91 Code: 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 07 b0 20 41 00 31 c0 c3 66 0f 1f 44 00 00 41 54 55 53 80 bf d4 RSP: 002b:00007fff00200710 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411c91 RDX: 0000000000000000 RSI: 0000000000000c25 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000b9618c25 R09: 00000000b9618c29 R10: 00007fff00200640 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000000e R15: 0000000000000000 INFO: task syz-executor5:17307 blocked for more than 140 seconds. Not tainted 4.20.0+ #175 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D23048 17307 8031 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 __get_super.part.11+0x207/0x2e0 fs/super.c:698 __get_super include/linux/spinlock.h:329 [inline] get_super+0x2d/0x50 fs/super.c:727 fsync_bdev+0x17/0xc0 fs/block_dev.c:495 invalidate_partition+0x35/0x60 block/genhd.c:1579 drop_partitions.isra.14+0xe1/0x200 block/partition-generic.c:443 rescan_partitions+0x72/0x8e0 block/partition-generic.c:516 __blkdev_reread_part+0x1ad/0x230 block/ioctl.c:173 blkdev_reread_part+0x26/0x40 block/ioctl.c:193 loop_reread_partitions+0x1c/0x40 drivers/block/loop.c:634 loop_set_status+0xcd8/0x10e0 drivers/block/loop.c:1269 loop_set_status64+0xaa/0x100 drivers/block/loop.c:1389 lo_ioctl+0x904/0x22a0 drivers/block/loop.c:1515 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0xd84/0x21b0 block/ioctl.c:605 block_ioctl+0xee/0x130 fs/block_dev.c:1909 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: Bad RIP value. RSP: 002b:00007f24463b4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000020000380 RSI: 0000000000004c04 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f24463b56d4 R13: 00000000004c1277 R14: 00000000004d2b50 R15: 00000000ffffffff INFO: task blkid:17309 blocked for more than 140 seconds. Not tainted 4.20.0+ #175 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23736 17309 9886 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 blkdev_put+0x34/0x540 fs/block_dev.c:1842 blkdev_close+0x8b/0xb0 fs/block_dev.c:1891 __fput+0x385/0xa50 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f60a592b2b0 Code: Bad RIP value. RSP: 002b:00007ffcb1dd15a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f60a592b2b0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001a90030 R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/1036: #0: 000000004c9f61ed (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7891: #0: 0000000042c4d2db (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:795 2 locks held by getty/7982: #0: 000000004152cb7b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000003afd1de8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/7983: #0: 000000004aac88fd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000b5809f7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/7984: #0: 0000000046ed84b2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d3cbd270 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/7985: #0: 00000000119bd644 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005b0fbb25 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/7986: #0: 00000000a1ccb7fd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000eb39d648 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/7987: #0: 000000005b22cff4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a3b710e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/7988: #0: 000000006e7705aa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000078302d61 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by kworker/u4:9/9421: #0: 0000000051e6017e (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1149 [inline] #0: 0000000051e6017e (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3410 #1: 000000004c9f61ed (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 000000004c9f61ed (rcu_read_lock){....}, at: update_curr+0x383/0xbe0 kernel/sched/fair.c:830 1 lock held by syz-executor0/17299: #0: 00000000a537b4d7 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x34/0x540 fs/block_dev.c:1842 2 locks held by syz-executor0/17305: 2 locks held by syz-executor5/17307: #0: 00000000a537b4d7 (&bdev->bd_mutex){+.+.}, at: blkdev_reread_part+0x1e/0x40 block/ioctl.c:192 #1: 000000002a9745ee (&type->s_umount_key#74){.+.+}, at: __get_super.part.11+0x207/0x2e0 fs/super.c:698 1 lock held by blkid/17309: #0: 00000000a537b4d7 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x34/0x540 fs/block_dev.c:1842 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1036 Comm: khungtaskd Not tainted 4.20.0+ #175 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+0x1d3/0x2c6 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9421 Comm: kworker/u4:9 Not tainted 4.20.0+ #175 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:write_comp_data+0x22/0x70 kernel/kcov.c:122 Code: 90 90 90 90 90 90 90 90 55 48 89 e5 65 4c 8b 04 25 40 ee 01 00 65 8b 05 ec 01 80 7e a9 00 01 1f 00 75 51 41 8b 80 d8 12 00 00 <83> f8 03 75 45 49 8b 80 e0 12 00 00 45 8b 80 dc 12 00 00 4c 8b 08 RSP: 0018:ffff8882165c7598 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff87d6b77b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff8882165c7598 R08: ffff888055f12000 R09: ffffed1015cc5b8f R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff888097710ac0 R13: 0000000000000001 R14: dffffc0000000000 R15: 00000000000002db FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000006ca18000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __sanitizer_cov_trace_const_cmp1+0x1a/0x20 kernel/kcov.c:174 rcu_read_unlock include/linux/rcupdate.h:657 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:423 [inline] batadv_nc_worker+0x2fb/0x920 net/batman-adv/network-coding.c:730 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352