INFO: task syz-executor050:8462 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor050 state:D stack:29784 pid: 8462 ppid: 1 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7b6/0x10a0 kernel/locking/mutex.c:1104 __do_sys_acct kernel/acct.c:285 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445779 RSP: 002b:00007f219fbcd308 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 00000000004ca408 RCX: 0000000000445779 RDX: 0000000000445779 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00000000004ca400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca40c R13: 000000000049a074 R14: 0030656c69662f2e R15: 0000000000022000 INFO: task syz-executor050:8465 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor050 state:D stack:29784 pid: 8465 ppid: 1 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7b6/0x10a0 kernel/locking/mutex.c:1104 __do_sys_acct kernel/acct.c:285 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445779 RSP: 002b:00007f219fbcd308 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 00000000004ca408 RCX: 0000000000445779 RDX: 0000000000445779 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00000000004ca400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca40c R13: 000000000049a074 R14: 0030656c69662f2e R15: 0000000000022000 INFO: task syz-executor050:8468 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor050 state:D stack:29904 pid: 8468 ppid: 1 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7b6/0x10a0 kernel/locking/mutex.c:1104 __do_sys_acct kernel/acct.c:285 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445779 RSP: 002b:00007f219fbcd308 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 00000000004ca408 RCX: 0000000000445779 RDX: 0000000000445779 RSI: 00000000000f4240 RDI: 00000000200001c0 RBP: 00000000004ca400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca40c R13: 000000000049a074 R14: 0030656c69662f2e R15: 0000000000022000 INFO: task syz-executor050:8470 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor050 state:D stack:28280 pid: 8470 ppid: 8441 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5938 schedule+0xd3/0x270 kernel/sched/core.c:6017 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6076 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7b6/0x10a0 kernel/locking/mutex.c:1104 __do_sys_acct kernel/acct.c:285 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445779 RSP: 002b:00007f219fbcd308 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 00000000004ca408 RCX: 0000000000445779 RDX: 0000000000445779 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00000000004ca400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca40c R13: 000000000049a074 R14: 0030656c69662f2e R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1646: #0: ffffffff8b97c1c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/8353: #0: ffff888018f6e0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 1 lock held by syz-executor050/8459: #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 1 lock held by syz-executor050/8462: #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 1 lock held by syz-executor050/8465: #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 1 lock held by syz-executor050/8468: #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 1 lock held by syz-executor050/8470: #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: ffffffff8b9b4088 (acct_on_mutex){+.+.}-{3:3}, at: __x64_sys_acct+0xa3/0x1f0 kernel/acct.c:273 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1646 Comm: khungtaskd Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xd0a/0xfc0 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553