Extracting prog: 7m50.844328215s Minimizing prog: 1h2m20.215174272s Simplifying prog options: 13m5.099188209s Extracting C: 5m28.391007738s Simplifying C: 0s extracting reproducer from 1 programs testing a last program of every proc single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash single: failed to extract reproducer single: executing 1 programs separately with timeout 1m40s testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash single: failed to extract reproducer single: executing 1 programs separately with timeout 6m0s testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program crashed: possible deadlock in task_rq_lock single: successfully extracted reproducer found reproducer with 4 syscalls minimizing guilty program testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, 0x0, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, 0x0) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, 0x0, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, 0x0) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime program crashed: no output from test machine a never seen crash title: no output from test machine, ignore simplifying guilty program options testing program (duration=6m24.676662678s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash testing program (duration=6m24.676662678s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x8) timer_create(0x0, &(0x7f0000000000)={0x0, 0x21, 0x0, @tid=0xffffffffffffffff}, &(0x7f0000000100)) timer_settime(0x0, 0x0, &(0x7f000006b000)={{0x0, 0x8}, {0x0, 0x9}}, 0x0) program did not crash reproducing took 1h28m44.549714066s repro crashed as (corrupted=false): ------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Not tainted ------------------------------------------------------ ksoftirqd/1/29 is trying to acquire lock: ffffffff8e1a90b8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 but task is already holding lock: ffff88806a73ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 raw_spin_rq_lock kernel/sched/sched.h:1514 [inline] task_rq_lock+0xcf/0x3b0 kernel/sched/core.c:700 cgroup_move_task+0x82/0x250 kernel/sched/psi.c:1161 css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:898 cgroup_post_fork+0x1c6/0x910 kernel/cgroup/cgroup.c:6691 copy_process+0x50d9/0x8df0 kernel/fork.c:2621 kernel_clone+0xfd/0x960 kernel/fork.c:2807 user_mode_thread+0xb4/0xf0 kernel/fork.c:2885 rest_init+0x23/0x2b0 init/main.c:712 start_kernel+0x3e4/0x4d0 init/main.c:1102 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 -> #1 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb6/0x1490 kernel/sched/core.c:4205 up+0x79/0xb0 kernel/locking/semaphore.c:191 __up_console_sem+0x85/0xe0 kernel/printk/printk.c:343 __console_unlock kernel/printk/printk.c:2869 [inline] __console_flush_and_unlock kernel/printk/printk.c:3271 [inline] console_unlock+0x1dc/0x210 kernel/printk/printk.c:3309 vga_remove_vgacon drivers/pci/vgaarb.c:186 [inline] vga_remove_vgacon+0x90/0xd0 drivers/pci/vgaarb.c:167 __aperture_remove_legacy_vga_devices drivers/video/aperture.c:331 [inline] aperture_remove_conflicting_pci_devices+0x16a/0x1e0 drivers/video/aperture.c:369 virtio_gpu_pci_quirk drivers/gpu/drm/virtio/virtgpu_drv.c:62 [inline] virtio_gpu_probe+0x409/0x4f0 drivers/gpu/drm/virtio/virtgpu_drv.c:93 virtio_dev_probe+0x586/0x8a0 drivers/virtio/virtio.c:341 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __driver_attach+0x283/0x580 drivers/base/dd.c:1216 bus_for_each_dev+0x13c/0x1d0 drivers/base/bus.c:370 bus_add_driver+0x2e9/0x690 drivers/base/bus.c:675 driver_register+0x15c/0x4b0 drivers/base/driver.c:246 do_one_initcall+0x128/0x700 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x5c7/0x900 init/main.c:1577 kernel_init+0x1c/0x2b0 init/main.c:1466 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:326 console_trylock kernel/printk/printk.c:2852 [inline] console_trylock_spinning kernel/printk/printk.c:2009 [inline] vprintk_emit+0x3ec/0x6f0 kernel/printk/printk.c:2431 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86 _printk+0xc8/0x100 kernel/printk/printk.c:2457 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x54/0xa0 arch/x86/kernel/traps.c:285 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 dl_server_start+0xb9/0x6f0 kernel/sched/deadline.c:1650 enqueue_task_fair+0x550/0xfb0 kernel/sched/fair.c:7044 enqueue_task+0x73/0x3e0 kernel/sched/core.c:2061 activate_task+0x54/0xd0 kernel/sched/core.c:2108 attach_task+0x116/0x1b0 kernel/sched/fair.c:9641 attach_tasks kernel/sched/fair.c:9676 [inline] sched_balance_rq+0x1456/0x2ec0 kernel/sched/fair.c:11753 sched_balance_newidle+0x6bb/0x1190 kernel/sched/fair.c:12795 pick_next_task_fair+0x50/0x1280 kernel/sched/fair.c:8943 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:6023 pick_next_task kernel/sched/core.c:6121 [inline] __schedule+0x430/0x5ad0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 smpboot_thread_fn+0x2d5/0xa30 kernel/smpboot.c:160 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by ksoftirqd/1/29: #0: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_release include/linux/rcupdate.h:347 [inline] #0: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_read_unlock include/linux/rcupdate.h:880 [inline] #0: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: sched_balance_newidle+0x47c/0x1190 kernel/sched/fair.c:12777 #1: ffff88806a73ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 stack backtrace: CPU: 1 UID: 0 PID: 29 Comm: ksoftirqd/1 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:326 console_trylock kernel/printk/printk.c:2852 [inline] console_trylock_spinning kernel/printk/printk.c:2009 [inline] vprintk_emit+0x3ec/0x6f0 kernel/printk/printk.c:2431 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86 _printk+0xc8/0x100 kernel/printk/printk.c:2457 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x54/0xa0 arch/x86/kernel/traps.c:285 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 Code: f1 ff ff 44 8b 1c 24 45 85 db 0f 84 57 f9 ff ff 48 83 c4 28 44 89 e6 48 89 cf 5b 5d 41 5c 41 5d 41 5e 41 5f e9 7a 61 ff ff 90 <0f> 0b 90 e9 89 ec ff ff 90 0f 0b 90 e9 2b f3 ff ff 45 84 f6 0f 85 RSP: 0018:ffffc90000687778 EFLAGS: 00010082 RAX: dffffc0000000000 RBX: ffff88806a73f5a8 RCX: ffff88806a73f5a8 RDX: 1ffff1100d4e7eb5 RSI: 0000000000000001 RDI: ffff88806a73f5a8 RBP: ffff88806a73f5fc R08: 0000000000000001 R09: 0000000000000000 R10: ffff888024958147 R11: 0000000000000002 R12: 0000000000000001 R13: ffff88806a73ebc0 R14: 0000000000225510 R15: dffffc0000000000 dl_server_start+0xb9/0x6f0 kernel/sched/deadline.c:1650 enqueue_task_fair+0x550/0xfb0 kernel/sched/fair.c:7044 enqueue_task+0x73/0x3e0 kernel/sched/core.c:2061 activate_task+0x54/0xd0 kernel/sched/core.c:2108 attach_task+0x116/0x1b0 kernel/sched/fair.c:9641 attach_tasks kernel/sched/fair.c:9676 [inline] sched_balance_rq+0x1456/0x2ec0 kernel/sched/fair.c:11753 sched_balance_newidle+0x6bb/0x1190 kernel/sched/fair.c:12795 pick_next_task_fair+0x50/0x1280 kernel/sched/fair.c:8943 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:6023 pick_next_task kernel/sched/core.c:6121 [inline] __schedule+0x430/0x5ad0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 smpboot_thread_fn+0x2d5/0xa30 kernel/smpboot.c:160 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 WARNING: CPU: 1 PID: 29 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 Modules linked in: CPU: 1 UID: 0 PID: 29 Comm: ksoftirqd/1 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 Code: f1 ff ff 44 8b 1c 24 45 85 db 0f 84 57 f9 ff ff 48 83 c4 28 44 89 e6 48 89 cf 5b 5d 41 5c 41 5d 41 5e 41 5f e9 7a 61 ff ff 90 <0f> 0b 90 e9 89 ec ff ff 90 0f 0b 90 e9 2b f3 ff ff 45 84 f6 0f 85 RSP: 0018:ffffc90000687778 EFLAGS: 00010082 RAX: dffffc0000000000 RBX: ffff88806a73f5a8 RCX: ffff88806a73f5a8 RDX: 1ffff1100d4e7eb5 RSI: 0000000000000001 RDI: ffff88806a73f5a8 RBP: ffff88806a73f5fc R08: 0000000000000001 R09: 0000000000000000 R10: ffff888024958147 R11: 0000000000000002 R12: 0000000000000001 R13: ffff88806a73ebc0 R14: 0000000000225510 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002006b000 CR3: 000000000df7e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dl_server_start+0xb9/0x6f0 kernel/sched/deadline.c:1650 enqueue_task_fair+0x550/0xfb0 kernel/sched/fair.c:7044 enqueue_task+0x73/0x3e0 kernel/sched/core.c:2061 activate_task+0x54/0xd0 kernel/sched/core.c:2108 attach_task+0x116/0x1b0 kernel/sched/fair.c:9641 attach_tasks kernel/sched/fair.c:9676 [inline] sched_balance_rq+0x1456/0x2ec0 kernel/sched/fair.c:11753 sched_balance_newidle+0x6bb/0x1190 kernel/sched/fair.c:12795 pick_next_task_fair+0x50/0x1280 kernel/sched/fair.c:8943 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:6023 pick_next_task kernel/sched/core.c:6121 [inline] __schedule+0x430/0x5ad0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 smpboot_thread_fn+0x2d5/0xa30 kernel/smpboot.c:160 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 final repro crashed as (corrupted=false): ------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Not tainted ------------------------------------------------------ ksoftirqd/1/29 is trying to acquire lock: ffffffff8e1a90b8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 but task is already holding lock: ffff88806a73ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 raw_spin_rq_lock kernel/sched/sched.h:1514 [inline] task_rq_lock+0xcf/0x3b0 kernel/sched/core.c:700 cgroup_move_task+0x82/0x250 kernel/sched/psi.c:1161 css_set_move_task+0x288/0x5f0 kernel/cgroup/cgroup.c:898 cgroup_post_fork+0x1c6/0x910 kernel/cgroup/cgroup.c:6691 copy_process+0x50d9/0x8df0 kernel/fork.c:2621 kernel_clone+0xfd/0x960 kernel/fork.c:2807 user_mode_thread+0xb4/0xf0 kernel/fork.c:2885 rest_init+0x23/0x2b0 init/main.c:712 start_kernel+0x3e4/0x4d0 init/main.c:1102 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 -> #1 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb6/0x1490 kernel/sched/core.c:4205 up+0x79/0xb0 kernel/locking/semaphore.c:191 __up_console_sem+0x85/0xe0 kernel/printk/printk.c:343 __console_unlock kernel/printk/printk.c:2869 [inline] __console_flush_and_unlock kernel/printk/printk.c:3271 [inline] console_unlock+0x1dc/0x210 kernel/printk/printk.c:3309 vga_remove_vgacon drivers/pci/vgaarb.c:186 [inline] vga_remove_vgacon+0x90/0xd0 drivers/pci/vgaarb.c:167 __aperture_remove_legacy_vga_devices drivers/video/aperture.c:331 [inline] aperture_remove_conflicting_pci_devices+0x16a/0x1e0 drivers/video/aperture.c:369 virtio_gpu_pci_quirk drivers/gpu/drm/virtio/virtgpu_drv.c:62 [inline] virtio_gpu_probe+0x409/0x4f0 drivers/gpu/drm/virtio/virtgpu_drv.c:93 virtio_dev_probe+0x586/0x8a0 drivers/virtio/virtio.c:341 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830 __driver_attach+0x283/0x580 drivers/base/dd.c:1216 bus_for_each_dev+0x13c/0x1d0 drivers/base/bus.c:370 bus_add_driver+0x2e9/0x690 drivers/base/bus.c:675 driver_register+0x15c/0x4b0 drivers/base/driver.c:246 do_one_initcall+0x128/0x700 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x5c7/0x900 init/main.c:1577 kernel_init+0x1c/0x2b0 init/main.c:1466 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:326 console_trylock kernel/printk/printk.c:2852 [inline] console_trylock_spinning kernel/printk/printk.c:2009 [inline] vprintk_emit+0x3ec/0x6f0 kernel/printk/printk.c:2431 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86 _printk+0xc8/0x100 kernel/printk/printk.c:2457 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x54/0xa0 arch/x86/kernel/traps.c:285 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 dl_server_start+0xb9/0x6f0 kernel/sched/deadline.c:1650 enqueue_task_fair+0x550/0xfb0 kernel/sched/fair.c:7044 enqueue_task+0x73/0x3e0 kernel/sched/core.c:2061 activate_task+0x54/0xd0 kernel/sched/core.c:2108 attach_task+0x116/0x1b0 kernel/sched/fair.c:9641 attach_tasks kernel/sched/fair.c:9676 [inline] sched_balance_rq+0x1456/0x2ec0 kernel/sched/fair.c:11753 sched_balance_newidle+0x6bb/0x1190 kernel/sched/fair.c:12795 pick_next_task_fair+0x50/0x1280 kernel/sched/fair.c:8943 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:6023 pick_next_task kernel/sched/core.c:6121 [inline] __schedule+0x430/0x5ad0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 smpboot_thread_fn+0x2d5/0xa30 kernel/smpboot.c:160 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by ksoftirqd/1/29: #0: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_release include/linux/rcupdate.h:347 [inline] #0: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: rcu_read_unlock include/linux/rcupdate.h:880 [inline] #0: ffffffff8e1bb500 (rcu_read_lock){....}-{1:3}, at: sched_balance_newidle+0x47c/0x1190 kernel/sched/fair.c:12777 #1: ffff88806a73ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 stack backtrace: CPU: 1 UID: 0 PID: 29 Comm: ksoftirqd/1 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:326 console_trylock kernel/printk/printk.c:2852 [inline] console_trylock_spinning kernel/printk/printk.c:2009 [inline] vprintk_emit+0x3ec/0x6f0 kernel/printk/printk.c:2431 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:86 _printk+0xc8/0x100 kernel/printk/printk.c:2457 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x54/0xa0 arch/x86/kernel/traps.c:285 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 Code: f1 ff ff 44 8b 1c 24 45 85 db 0f 84 57 f9 ff ff 48 83 c4 28 44 89 e6 48 89 cf 5b 5d 41 5c 41 5d 41 5e 41 5f e9 7a 61 ff ff 90 <0f> 0b 90 e9 89 ec ff ff 90 0f 0b 90 e9 2b f3 ff ff 45 84 f6 0f 85 RSP: 0018:ffffc90000687778 EFLAGS: 00010082 RAX: dffffc0000000000 RBX: ffff88806a73f5a8 RCX: ffff88806a73f5a8 RDX: 1ffff1100d4e7eb5 RSI: 0000000000000001 RDI: ffff88806a73f5a8 RBP: ffff88806a73f5fc R08: 0000000000000001 R09: 0000000000000000 R10: ffff888024958147 R11: 0000000000000002 R12: 0000000000000001 R13: ffff88806a73ebc0 R14: 0000000000225510 R15: dffffc0000000000 dl_server_start+0xb9/0x6f0 kernel/sched/deadline.c:1650 enqueue_task_fair+0x550/0xfb0 kernel/sched/fair.c:7044 enqueue_task+0x73/0x3e0 kernel/sched/core.c:2061 activate_task+0x54/0xd0 kernel/sched/core.c:2108 attach_task+0x116/0x1b0 kernel/sched/fair.c:9641 attach_tasks kernel/sched/fair.c:9676 [inline] sched_balance_rq+0x1456/0x2ec0 kernel/sched/fair.c:11753 sched_balance_newidle+0x6bb/0x1190 kernel/sched/fair.c:12795 pick_next_task_fair+0x50/0x1280 kernel/sched/fair.c:8943 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:6023 pick_next_task kernel/sched/core.c:6121 [inline] __schedule+0x430/0x5ad0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 smpboot_thread_fn+0x2d5/0xa30 kernel/smpboot.c:160 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 WARNING: CPU: 1 PID: 29 at kernel/sched/deadline.c:1995 enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 Modules linked in: CPU: 1 UID: 0 PID: 29 Comm: ksoftirqd/1 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:enqueue_dl_entity+0x13a7/0x2a00 kernel/sched/deadline.c:1995 Code: f1 ff ff 44 8b 1c 24 45 85 db 0f 84 57 f9 ff ff 48 83 c4 28 44 89 e6 48 89 cf 5b 5d 41 5c 41 5d 41 5e 41 5f e9 7a 61 ff ff 90 <0f> 0b 90 e9 89 ec ff ff 90 0f 0b 90 e9 2b f3 ff ff 45 84 f6 0f 85 RSP: 0018:ffffc90000687778 EFLAGS: 00010082 RAX: dffffc0000000000 RBX: ffff88806a73f5a8 RCX: ffff88806a73f5a8 RDX: 1ffff1100d4e7eb5 RSI: 0000000000000001 RDI: ffff88806a73f5a8 RBP: ffff88806a73f5fc R08: 0000000000000001 R09: 0000000000000000 R10: ffff888024958147 R11: 0000000000000002 R12: 0000000000000001 R13: ffff88806a73ebc0 R14: 0000000000225510 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002006b000 CR3: 000000000df7e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dl_server_start+0xb9/0x6f0 kernel/sched/deadline.c:1650 enqueue_task_fair+0x550/0xfb0 kernel/sched/fair.c:7044 enqueue_task+0x73/0x3e0 kernel/sched/core.c:2061 activate_task+0x54/0xd0 kernel/sched/core.c:2108 attach_task+0x116/0x1b0 kernel/sched/fair.c:9641 attach_tasks kernel/sched/fair.c:9676 [inline] sched_balance_rq+0x1456/0x2ec0 kernel/sched/fair.c:11753 sched_balance_newidle+0x6bb/0x1190 kernel/sched/fair.c:12795 pick_next_task_fair+0x50/0x1280 kernel/sched/fair.c:8943 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:6023 pick_next_task kernel/sched/core.c:6121 [inline] __schedule+0x430/0x5ad0 kernel/sched/core.c:6709 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 smpboot_thread_fn+0x2d5/0xa30 kernel/smpboot.c:160 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244