INFO: task syz-executor762:10326 blocked for more than 143 seconds. Not tainted 5.3.0-rc4+ #105 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor762 D26528 10326 10257 0xa0020000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xa8/0x270 kernel/sched/core.c:3944 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1783 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136 exit_aio+0x321/0x3a0 fs/aio.c:895 __mmput kernel/fork.c:1061 [inline] mmput+0xcf/0x4d0 kernel/fork.c:1085 exit_mm kernel/exit.c:547 [inline] do_exit+0x84e/0x2e50 kernel/exit.c:866 do_group_exit+0x135/0x360 kernel/exit.c:983 __do_sys_exit_group kernel/exit.c:994 [inline] __se_sys_exit_group kernel/exit.c:992 [inline] __ia32_sys_exit_group+0x44/0x50 kernel/exit.c:992 do_syscall_32_irqs_on arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fa1a29 Code: b8 80 96 98 00 eb cc 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ff91cfec EFLAGS: 00000292 ORIG_RAX: 00000000000000fc RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080ef2b8 RDX: 0000000000000000 RSI: 00000000080d893c RDI: 00000000080ef2c0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc4+ #105 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x9d0/0xef0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10261 Comm: syz-executor762 Not tainted 5.3.0-rc4+ #105 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:95 Code: 25 e4 40 19 09 41 bc f4 ff ff ff e8 ed a0 e9 ff 48 c7 05 ce 40 19 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 b4 8c 8f 7e 81 e2 00 RSP: 0018:ffff888091d17be8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8144e224 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff888091d17d20 R08: ffff888089fb6500 R09: fffffbfff1181219 R10: fffffbfff1181218 R11: ffffffff88c090c3 R12: 0000000040000005 R13: ffff888091d17e14 R14: ffff8880a46aa580 R15: ffff888091d17e10 FS: 0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:0000000057cb3840 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fdba8291000 CR3: 00000000a9228000 CR4: 00000000001406f0 Call Trace: do_wait_thread kernel/exit.c:1458 [inline] do_wait+0x452/0xa10 kernel/exit.c:1529 kernel_wait4+0x171/0x290 kernel/exit.c:1671 __do_sys_waitpid kernel/exit.c:1700 [inline] __se_sys_waitpid kernel/exit.c:1698 [inline] __ia32_sys_waitpid+0x74/0xb0 kernel/exit.c:1698 do_syscall_32_irqs_on arch/x86/entry/common.c:332 [inline] do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:403 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fa1a29 Code: b8 80 96 98 00 eb cc 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ff91d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000007 RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00000000ff91d07c RDX: 0000000040000001 RSI: 00000000000d865f RDI: 0000000000000000 RBP: 00000000ff91d07c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000