[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 478.518002][ T6857] block nbd0: shutting down sockets [ 508.790880][ T2456] block nbd0: Possible stuck request 0000000044e5580e: control (read@0,4096B). Runtime 30 seconds [ 538.870749][ T2456] block nbd0: Possible stuck request 0000000044e5580e: control (read@0,4096B). Runtime 60 seconds [ 568.950884][ T2456] block nbd0: Possible stuck request 0000000044e5580e: control (read@0,4096B). Runtime 90 seconds [ 599.030772][ T2456] block nbd0: Possible stuck request 0000000044e5580e: control (read@0,4096B). Runtime 120 seconds [ 629.110801][ T2456] block nbd0: Possible stuck request 0000000044e5580e: control (read@0,4096B). Runtime 150 seconds [ 636.790810][ T1172] INFO: task syz-executor066:6866 can't die for more than 143 seconds. [ 636.799121][ T1172] task:syz-executor066 state:D stack:28568 pid: 6866 ppid: 6855 flags:0x00000004 [ 636.808673][ T1172] Call Trace: [ 636.812215][ T1172] __schedule+0x8e5/0x21e0 [ 636.816635][ T1172] ? io_schedule_timeout+0x140/0x140 [ 636.822055][ T1172] ? mark_held_locks+0x9f/0xe0 [ 636.826877][ T1172] ? wait_on_page_bit_common+0x52c/0xca0 [ 636.832571][ T1172] schedule+0xd0/0x2a0 [ 636.836648][ T1172] io_schedule+0xb5/0x120 [ 636.841051][ T1172] wait_on_page_bit_common+0x52c/0xca0 [ 636.846510][ T1172] ? replace_page_cache_page+0x1620/0x1620 [ 636.852476][ T1172] ? filemap_fdatawait_keep_errors+0xe0/0xe0 [ 636.858653][ T1172] ? pagecache_get_page+0x22b/0xf70 [ 636.863935][ T1172] do_read_cache_page+0x257/0x1390 [ 636.869127][ T1172] read_part_sector+0xf6/0x5af [ 636.873947][ T1172] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 636.879226][ T1172] adfspart_check_ICS+0x9d/0xc90 [ 636.884283][ T1172] ? pointer+0x970/0x970 [ 636.888574][ T1172] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 636.894191][ T1172] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 636.899479][ T1172] ? snprintf+0xbb/0xf0 [ 636.903703][ T1172] ? vsprintf+0x30/0x30 [ 636.907865][ T1172] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 636.913208][ T1172] blk_add_partitions+0x445/0xe00 [ 636.918368][ T1172] bdev_disk_changed+0x1ea/0x370 [ 636.923394][ T1172] __blkdev_get+0xee4/0x1aa0 [ 636.927995][ T1172] ? freeze_bdev+0x250/0x250 [ 636.932688][ T1172] ? do_raw_spin_unlock+0x171/0x230 [ 636.937894][ T1172] blkdev_open+0x227/0x300 [ 636.942474][ T1172] do_dentry_open+0x4b9/0x11b0 [ 636.947238][ T1172] ? blkdev_get_by_path+0x100/0x100 [ 636.952545][ T1172] path_openat+0x1b9a/0x2730 [ 636.957146][ T1172] ? path_lookupat+0x830/0x830 [ 636.962000][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 636.966940][ T1172] do_filp_open+0x17e/0x3c0 [ 636.971491][ T1172] ? may_open_dev+0xf0/0xf0 [ 636.976011][ T1172] ? do_raw_spin_lock+0x120/0x2b0 [ 636.981130][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 636.986117][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 636.991065][ T1172] ? __alloc_fd+0x28d/0x600 [ 636.995593][ T1172] do_sys_openat2+0x16d/0x420 [ 637.000248][ T1172] ? build_open_flags+0x650/0x650 [ 637.005385][ T1172] __x64_sys_open+0x119/0x1c0 [ 637.010086][ T1172] ? do_sys_open+0x140/0x140 [ 637.014743][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 637.020866][ T1172] ? trace_hardirqs_on+0x5f/0x220 [ 637.025879][ T1172] ? lockdep_hardirqs_on+0x76/0xf0 [ 637.031079][ T1172] do_syscall_64+0x2d/0x70 [ 637.035510][ T1172] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.041482][ T1172] RIP: 0033:0x405811 [ 637.045371][ T1172] Code: Bad RIP value. [ 637.049414][ T1172] RSP: 002b:00007f3442d94980 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [ 637.057893][ T1172] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000405811 [ 637.065976][ T1172] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f3442d94990 [ 637.074029][ T1172] RBP: 6666666666666667 R08: 000000000000000f R09: 00007f3442d95700 [ 637.082114][ T1172] R10: 00007f3442d959d0 R11: 0000000000000293 R12: 00000000006dbc4c [ 637.090077][ T1172] R13: 00007fffc941905f R14: 00007f3442d959c0 R15: 20c49ba5e353f7cf [ 637.098203][ T1172] INFO: task syz-executor066:6866 blocked for more than 143 seconds. [ 637.106365][ T1172] Not tainted 5.9.0-rc2-next-20200824-syzkaller #0 [ 637.113460][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 637.122236][ T1172] task:syz-executor066 state:D stack:28568 pid: 6866 ppid: 6855 flags:0x00000004 [ 637.131576][ T1172] Call Trace: [ 637.134891][ T1172] __schedule+0x8e5/0x21e0 [ 637.139300][ T1172] ? io_schedule_timeout+0x140/0x140 [ 637.144696][ T1172] ? mark_held_locks+0x9f/0xe0 [ 637.149469][ T1172] ? wait_on_page_bit_common+0x52c/0xca0 [ 637.155184][ T1172] schedule+0xd0/0x2a0 [ 637.159264][ T1172] io_schedule+0xb5/0x120 [ 637.163705][ T1172] wait_on_page_bit_common+0x52c/0xca0 [ 637.169212][ T1172] ? replace_page_cache_page+0x1620/0x1620 [ 637.175086][ T1172] ? filemap_fdatawait_keep_errors+0xe0/0xe0 [ 637.181160][ T1172] ? pagecache_get_page+0x22b/0xf70 [ 637.186346][ T1172] do_read_cache_page+0x257/0x1390 [ 637.191556][ T1172] read_part_sector+0xf6/0x5af [ 637.196328][ T1172] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 637.201702][ T1172] adfspart_check_ICS+0x9d/0xc90 [ 637.206647][ T1172] ? pointer+0x970/0x970 [ 637.210937][ T1172] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 637.216489][ T1172] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 637.221849][ T1172] ? snprintf+0xbb/0xf0 [ 637.226020][ T1172] ? vsprintf+0x30/0x30 [ 637.230160][ T1172] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 637.235489][ T1172] blk_add_partitions+0x445/0xe00 [ 637.240542][ T1172] bdev_disk_changed+0x1ea/0x370 [ 637.245563][ T1172] __blkdev_get+0xee4/0x1aa0 [ 637.250157][ T1172] ? freeze_bdev+0x250/0x250 [ 637.254793][ T1172] ? do_raw_spin_unlock+0x171/0x230 [ 637.260013][ T1172] blkdev_open+0x227/0x300 [ 637.264532][ T1172] do_dentry_open+0x4b9/0x11b0 [ 637.269341][ T1172] ? blkdev_get_by_path+0x100/0x100 [ 637.274588][ T1172] path_openat+0x1b9a/0x2730 [ 637.279189][ T1172] ? path_lookupat+0x830/0x830 [ 637.284047][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 637.288989][ T1172] do_filp_open+0x17e/0x3c0 [ 637.293557][ T1172] ? may_open_dev+0xf0/0xf0 [ 637.298098][ T1172] ? do_raw_spin_lock+0x120/0x2b0 [ 637.303201][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 637.308663][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 637.313562][ T1172] ? __alloc_fd+0x28d/0x600 [ 637.318097][ T1172] do_sys_openat2+0x16d/0x420 [ 637.322859][ T1172] ? build_open_flags+0x650/0x650 [ 637.327888][ T1172] __x64_sys_open+0x119/0x1c0 [ 637.332607][ T1172] ? do_sys_open+0x140/0x140 [ 637.337221][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 637.343286][ T1172] ? trace_hardirqs_on+0x5f/0x220 [ 637.348318][ T1172] ? lockdep_hardirqs_on+0x76/0xf0 [ 637.353477][ T1172] do_syscall_64+0x2d/0x70 [ 637.357912][ T1172] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.363909][ T1172] RIP: 0033:0x405811 [ 637.367795][ T1172] Code: Bad RIP value. [ 637.371895][ T1172] RSP: 002b:00007f3442d94980 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [ 637.380332][ T1172] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000405811 [ 637.388379][ T1172] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f3442d94990 [ 637.396434][ T1172] RBP: 6666666666666667 R08: 000000000000000f R09: 00007f3442d95700 [ 637.404485][ T1172] R10: 00007f3442d959d0 R11: 0000000000000293 R12: 00000000006dbc4c [ 637.412531][ T1172] R13: 00007fffc941905f R14: 00007f3442d959c0 R15: 20c49ba5e353f7cf [ 637.420529][ T1172] INFO: task syz-executor066:6867 can't die for more than 143 seconds. [ 637.428845][ T1172] task:syz-executor066 state:D stack:28744 pid: 6867 ppid: 6855 flags:0x00000004 [ 637.438140][ T1172] Call Trace: [ 637.441533][ T1172] __schedule+0x8e5/0x21e0 [ 637.445958][ T1172] ? io_schedule_timeout+0x140/0x140 [ 637.451337][ T1172] schedule+0xd0/0x2a0 [ 637.455417][ T1172] schedule_preempt_disabled+0xf/0x20 [ 637.460873][ T1172] __mutex_lock+0x3e2/0x10e0 [ 637.465464][ T1172] ? lock_acquire+0x1f1/0xad0 [ 637.470121][ T1172] ? __blkdev_get+0x4b8/0x1aa0 [ 637.474936][ T1172] ? mutex_lock_io_nested+0xf60/0xf60 [ 637.480304][ T1172] ? _down_write_nest_lock+0x150/0x150 [ 637.485929][ T1172] ? kobj_lookup+0x36f/0x460 [ 637.490567][ T1172] ? disk_block_events+0x1d/0x130 [ 637.495663][ T1172] __blkdev_get+0x4b8/0x1aa0 [ 637.500254][ T1172] ? freeze_bdev+0x250/0x250 [ 637.504938][ T1172] ? do_raw_spin_unlock+0x171/0x230 [ 637.510141][ T1172] blkdev_open+0x227/0x300 [ 637.515045][ T1172] do_dentry_open+0x4b9/0x11b0 [ 637.519835][ T1172] ? blkdev_get_by_path+0x100/0x100 [ 637.525118][ T1172] path_openat+0x1b9a/0x2730 [ 637.529715][ T1172] ? path_lookupat+0x830/0x830 [ 637.534540][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 637.539480][ T1172] do_filp_open+0x17e/0x3c0 [ 637.544054][ T1172] ? may_open_dev+0xf0/0xf0 [ 637.548558][ T1172] ? do_raw_spin_lock+0x120/0x2b0 [ 637.553621][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 637.558566][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 637.563485][ T1172] ? __alloc_fd+0x28d/0x600 [ 637.567991][ T1172] do_sys_openat2+0x16d/0x420 [ 637.572706][ T1172] ? lock_downgrade+0x830/0x830 [ 637.577578][ T1172] ? build_open_flags+0x650/0x650 [ 637.582696][ T1172] __x64_sys_open+0x119/0x1c0 [ 637.587370][ T1172] ? do_sys_open+0x140/0x140 [ 637.592022][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 637.598023][ T1172] ? trace_hardirqs_on+0x5f/0x220 [ 637.603123][ T1172] ? lockdep_hardirqs_on+0x76/0xf0 [ 637.608236][ T1172] do_syscall_64+0x2d/0x70 [ 637.612698][ T1172] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.618594][ T1172] RIP: 0033:0x405811 [ 637.622543][ T1172] Code: Bad RIP value. [ 637.626601][ T1172] RSP: 002b:00007f3442d73980 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [ 637.635050][ T1172] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000405811 [ 637.643203][ T1172] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f3442d73990 [ 637.651229][ T1172] RBP: 6666666666666667 R08: 000000000000000f R09: 0000000000000000 [ 637.659198][ T1172] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dbc5c [ 637.667248][ T1172] R13: 00007fffc941905f R14: 00007f3442d749c0 R15: 20c49ba5e353f7cf [ 637.675289][ T1172] INFO: task syz-executor066:6867 blocked for more than 144 seconds. [ 637.683439][ T1172] Not tainted 5.9.0-rc2-next-20200824-syzkaller #0 [ 637.690452][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 637.699163][ T1172] task:syz-executor066 state:D stack:28744 pid: 6867 ppid: 6855 flags:0x00000004 [ 637.708464][ T1172] Call Trace: [ 637.711809][ T1172] __schedule+0x8e5/0x21e0 [ 637.716235][ T1172] ? io_schedule_timeout+0x140/0x140 [ 637.721587][ T1172] schedule+0xd0/0x2a0 [ 637.725673][ T1172] schedule_preempt_disabled+0xf/0x20 [ 637.731095][ T1172] __mutex_lock+0x3e2/0x10e0 [ 637.735681][ T1172] ? lock_acquire+0x1f1/0xad0 [ 637.740333][ T1172] ? __blkdev_get+0x4b8/0x1aa0 [ 637.745178][ T1172] ? mutex_lock_io_nested+0xf60/0xf60 [ 637.750563][ T1172] ? _down_write_nest_lock+0x150/0x150 [ 637.756061][ T1172] ? kobj_lookup+0x36f/0x460 [ 637.760756][ T1172] ? disk_block_events+0x1d/0x130 [ 637.765771][ T1172] __blkdev_get+0x4b8/0x1aa0 [ 637.770343][ T1172] ? freeze_bdev+0x250/0x250 [ 637.774982][ T1172] ? do_raw_spin_unlock+0x171/0x230 [ 637.780181][ T1172] blkdev_open+0x227/0x300 [ 637.784689][ T1172] do_dentry_open+0x4b9/0x11b0 [ 637.789467][ T1172] ? blkdev_get_by_path+0x100/0x100 [ 637.794760][ T1172] path_openat+0x1b9a/0x2730 [ 637.799401][ T1172] ? path_lookupat+0x830/0x830 [ 637.804244][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 637.809196][ T1172] do_filp_open+0x17e/0x3c0 [ 637.813742][ T1172] ? may_open_dev+0xf0/0xf0 [ 637.818258][ T1172] ? do_raw_spin_lock+0x120/0x2b0 [ 637.823350][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 637.828289][ T1172] ? _raw_spin_unlock+0x24/0x40 [ 637.833180][ T1172] ? __alloc_fd+0x28d/0x600 [ 637.837693][ T1172] do_sys_openat2+0x16d/0x420 [ 637.842458][ T1172] ? lock_downgrade+0x830/0x830 [ 637.847307][ T1172] ? build_open_flags+0x650/0x650 [ 637.852392][ T1172] __x64_sys_open+0x119/0x1c0 [ 637.857087][ T1172] ? do_sys_open+0x140/0x140 [ 637.861748][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 637.867726][ T1172] ? trace_hardirqs_on+0x5f/0x220 [ 637.872851][ T1172] ? lockdep_hardirqs_on+0x76/0xf0 [ 637.877962][ T1172] do_syscall_64+0x2d/0x70 [ 637.882485][ T1172] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.888380][ T1172] RIP: 0033:0x405811 [ 637.892329][ T1172] Code: Bad RIP value. [ 637.896393][ T1172] RSP: 002b:00007f3442d73980 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [ 637.904872][ T1172] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000405811 [ 637.912902][ T1172] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f3442d73990 [ 637.920954][ T1172] RBP: 6666666666666667 R08: 000000000000000f R09: 0000000000000000 [ 637.928933][ T1172] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dbc5c [ 637.936957][ T1172] R13: 00007fffc941905f R14: 00007f3442d749c0 R15: 20c49ba5e353f7cf [ 637.945077][ T1172] [ 637.945077][ T1172] Showing all locks held in the system: [ 637.952857][ T1172] 1 lock held by khungtaskd/1172: [ 637.957876][ T1172] #0: ffffffff89c675c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.967812][ T1172] 2 locks held by in:imklog/6558: [ 637.972880][ T1172] #0: ffff8880a77981b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.982111][ T1172] #1: ffffffff89c675c0 (rcu_read_lock){....}-{1:2}, at: try_to_wake_up+0x52b/0x12b0 [ 637.991738][ T1172] 1 lock held by syz-executor066/6866: [ 637.997189][ T1172] #0: ffff8880913452c0 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x4b8/0x1aa0 [ 638.006733][ T1172] 1 lock held by syz-executor066/6867: [ 638.012251][ T1172] #0: ffff8880913452c0 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x4b8/0x1aa0 [ 638.021813][ T1172] [ 638.024135][ T1172] ============================================= [ 638.024135][ T1172] [ 638.032574][ T1172] NMI backtrace for cpu 1 [ 638.036898][ T1172] CPU: 1 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc2-next-20200824-syzkaller #0 [ 638.046321][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.056355][ T1172] Call Trace: [ 638.059689][ T1172] dump_stack+0x18f/0x20d [ 638.064023][ T1172] nmi_cpu_backtrace.cold+0x44/0xd7 [ 638.069293][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 638.074907][ T1172] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 638.080919][ T1172] watchdog+0xd89/0xf30 [ 638.085063][ T1172] ? trace_sched_process_hang+0x2e0/0x2e0 [ 638.090808][ T1172] kthread+0x3b5/0x4a0 [ 638.094880][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 638.099965][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 638.105124][ T1172] ret_from_fork+0x1f/0x30 [ 638.109685][ T1172] Sending NMI from CPU 1 to CPUs 0: [ 638.115810][ C0] NMI backtrace for cpu 0 [ 638.115818][ C0] CPU: 0 PID: 3887 Comm: systemd-journal Not tainted 5.9.0-rc2-next-20200824-syzkaller #0 [ 638.115825][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.115829][ C0] RIP: 0010:__orc_find+0x6/0xf0 [ 638.115842][ C0] Code: be e8 1e 0e 81 00 48 c7 c7 a0 d0 48 88 e8 d2 d6 81 02 cc cc 48 8b 07 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 41 57 89 d0 41 56 <41> 55 41 54 4c 8d 64 87 fc 55 53 48 83 ec 10 85 d2 0f 84 95 00 00 [ 638.115846][ C0] RSP: 0018:ffffc900054c79b8 EFLAGS: 00000006 [ 638.115856][ C0] RAX: 000000000000000c RBX: 1ffff92000a98f42 RCX: ffffffff87f5509c [ 638.115862][ C0] RDX: 000000000000000c RSI: ffffffff8ba52a20 RDI: ffffffff8b1d959c [ 638.115868][ C0] RBP: 0000000000000001 R08: ffffffff8ba52a68 R09: ffffffff8ba52a20 [ 638.115874][ C0] R10: 000000000007201e R11: 0000000000161242 R12: ffffc900054c7af0 [ 638.115880][ C0] R13: ffffc900054c7add R14: ffffc900054c7af8 R15: ffffc900054c7aa8 [ 638.115886][ C0] FS: 00007fa933e108c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 638.115891][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 638.115897][ C0] CR2: 00007fa9311c1000 CR3: 00000000941f8000 CR4: 00000000001506f0 [ 638.115903][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 638.115908][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 638.115912][ C0] Call Trace: [ 638.115916][ C0] unwind_next_frame+0x342/0x1f90 [ 638.115920][ C0] ? do_syscall_64+0x2d/0x70 [ 638.115924][ C0] ? deref_stack_reg+0x150/0x150 [ 638.115929][ C0] ? __unwind_start+0x517/0x800 [ 638.115933][ C0] ? profile_setup.cold+0xc1/0xc1 [ 638.115937][ C0] arch_stack_walk+0x81/0xf0 [ 638.115941][ C0] ? do_syscall_64+0x2d/0x70 [ 638.115946][ C0] ? __put_cred+0x1de/0x250 [ 638.115950][ C0] stack_trace_save+0x8c/0xc0 [ 638.115955][ C0] ? stack_trace_consume_entry+0x160/0x160 [ 638.115959][ C0] ? put_cred_rcu+0x122/0x4e0 [ 638.115964][ C0] ? __put_cred+0x1de/0x250 [ 638.115968][ C0] ? revert_creds+0x1a8/0x1f0 [ 638.115972][ C0] kasan_save_stack+0x1b/0x40 [ 638.115977][ C0] ? kasan_save_stack+0x1b/0x40 [ 638.115981][ C0] ? kasan_set_track+0x1c/0x30 [ 638.115986][ C0] ? kasan_set_free_info+0x1b/0x30 [ 638.115990][ C0] ? __kasan_slab_free+0xd8/0x120 [ 638.115995][ C0] ? kmem_cache_free.part.0+0x67/0x1f0 [ 638.115999][ C0] ? __put_cred+0x1de/0x250 [ 638.116004][ C0] ? revert_creds+0x1a8/0x1f0 [ 638.116008][ C0] ? do_faccessat+0x2ca/0x820 [ 638.116013][ C0] ? do_syscall_64+0x2d/0x70 [ 638.116017][ C0] ? find_held_lock+0x2d/0x110 [ 638.116022][ C0] ? lock_acquire+0x1f1/0xad0 [ 638.116027][ C0] ? debug_check_no_obj_freed+0xc7/0x41c [ 638.116031][ C0] ? find_held_lock+0x2d/0x110 [ 638.116036][ C0] ? debug_check_no_obj_freed+0x20c/0x41c [ 638.116041][ C0] ? lock_downgrade+0x830/0x830 [ 638.116045][ C0] ? lockdep_hardirqs_off+0x89/0xc0 [ 638.116050][ C0] ? trace_hardirqs_off+0x27/0x210 [ 638.116055][ C0] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 638.116060][ C0] ? debug_check_no_obj_freed+0x20c/0x41c [ 638.116064][ C0] kasan_set_track+0x1c/0x30 [ 638.116069][ C0] kasan_set_free_info+0x1b/0x30 [ 638.116073][ C0] __kasan_slab_free+0xd8/0x120 [ 638.116078][ C0] ? __put_cred+0x1de/0x250 [ 638.116082][ C0] kmem_cache_free.part.0+0x67/0x1f0 [ 638.116087][ C0] __put_cred+0x1de/0x250 [ 638.116091][ C0] revert_creds+0x1a8/0x1f0 [ 638.116095][ C0] do_faccessat+0x2ca/0x820 [ 638.116100][ C0] ? stream_open+0x60/0x60 [ 638.116104][ C0] ? __secure_computing+0x104/0x360 [ 638.116109][ C0] do_syscall_64+0x2d/0x70 [ 638.116114][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 638.116118][ C0] RIP: 0033:0x7fa9330cc9c7 [ 638.116131][ C0] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 638.116136][ C0] RSP: 002b:00007ffc39eb4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 638.116147][ C0] RAX: ffffffffffffffda RBX: 00007ffc39eb8010 RCX: 00007fa9330cc9c7 [ 638.116153][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000560f967b09a3 [ 638.116159][ C0] RBP: 00007ffc39eb5130 R08: 0000560f967a63e5 R09: 0000000000000018 [ 638.116166][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 638.116171][ C0] R13: 0000000000000000 R14: 0000560f9771a8a0 R15: 00007ffc39eb5620 [ 638.116220][ T1172] Kernel panic - not syncing: hung_task: blocked tasks [ 638.551299][ T1172] CPU: 1 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc2-next-20200824-syzkaller #0 [ 638.560727][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.570843][ T1172] Call Trace: [ 638.574119][ T1172] dump_stack+0x18f/0x20d [ 638.578499][ T1172] panic+0x2e3/0x75c [ 638.582375][ T1172] ? __warn_printk+0xf3/0xf3 [ 638.586953][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 638.592562][ T1172] ? preempt_schedule_thunk+0x16/0x18 [ 638.597922][ T1172] ? watchdog.cold+0x22d/0x24b [ 638.602659][ T1172] ? watchdog+0xc59/0xf30 [ 638.606965][ T1172] watchdog.cold+0x23e/0x24b [ 638.611530][ T1172] ? trace_sched_process_hang+0x2e0/0x2e0 [ 638.617227][ T1172] kthread+0x3b5/0x4a0 [ 638.621272][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 638.626358][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 638.631445][ T1172] ret_from_fork+0x1f/0x30 [ 638.637042][ T1172] Kernel Offset: disabled [ 638.641361][ T1172] Rebooting in 86400 seconds..