INFO: task syz-executor.4:6638 blocked for more than 143 seconds. Not tainted 5.3.0-rc2+ #87 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28384 6638 18396 0x80004004 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 rwsem_down_read_slowpath+0x4cc/0xfb0 kernel/locking/rwsem.c:1090 __down_read kernel/locking/rwsem.c:1320 [inline] down_read+0x1f4/0x3f0 kernel/locking/rwsem.c:1463 exit_mm kernel/exit.c:513 [inline] do_exit+0x47b/0x2e50 kernel/exit.c:866 do_group_exit+0x135/0x360 kernel/exit.c:983 get_signal+0x47c/0x2500 kernel/signal.c:2729 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45987a Code: Bad RIP value. RSP: 002b:00007ffde4725dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 000000000045987a RDX: 0000000000000003 RSI: 0000000000021000 RDI: 0000000000000000 RBP: ffffffffffffffff R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000021000 R14: 0000000000020022 R15: 0000000000000000 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc2+ #87 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6646 Comm: syz-executor.4 Not tainted 5.3.0-rc2+ #87 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_cmp8+0x18/0x20 kernel/kcov.c:170 Code: 8b 4d 08 e8 3a ff ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff <5d> c3 66 0f 1f 44 00 00 55 40 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 RSP: 0018:ffff8880ae909b18 EFLAGS: 00000006 RAX: 0000000080010000 RBX: ffff8880603f9818 RCX: ffffffff8162d703 RDX: 000002c43cfe48d5 RSI: 0000000000002710 RDI: 0000000000000006 RBP: ffff8880ae909b18 R08: ffff88805ca9a300 R09: fffffbfff134ada0 R10: fffffbfff134ad9f R11: ffffffff89a56cff R12: 0000000000002710 R13: 000002c43cfe48d5 R14: 000002c43cfe21c5 R15: 0000000000000001 FS: 00007eff53489700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f419d621000 CR3: 0000000056d6a000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ktime_add_safe kernel/time/hrtimer.c:321 [inline] hrtimer_add_expires include/linux/hrtimer.h:246 [inline] hrtimer_forward+0x153/0x260 kernel/time/hrtimer.c:926 hrtimer_forward_now include/linux/hrtimer.h:456 [inline] perf_swevent_hrtimer+0x32d/0x3e0 kernel/events/core.c:9471 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1068 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1093 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:__sanitizer_cov_trace_pc+0x2b/0x50 kernel/kcov.c:105 Code: 48 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 94 5e 8f 7e 81 e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 f0 12 00 00 83 fa 02 75 20 <48> 8b 88 f8 12 00 00 8b 80 f4 12 00 00 48 8b 11 48 83 c2 01 48 39 RSP: 0018:ffff88805b6af368 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88805ca9a300 RBX: 0000000000000001 RCX: ffffffff819aaaac RDX: 0000000000000002 RSI: ffffffff819ab370 RDI: 0000000000000001 RBP: ffff88805b6af368 R08: ffff88805ca9a300 R09: ffffed1025ffffa1 R10: ffffed1025ffffa0 R11: ffff88812ffffd07 R12: ffff88812fffc000 R13: 0000000000027012 R14: dffffc0000000000 R15: ffff88805b6af6c0 isolate_migratepages_block+0xad0/0x2de0 mm/compaction.c:813 isolate_migratepages mm/compaction.c:1817 [inline] compact_zone+0x1428/0x38d0 mm/compaction.c:2158 compact_zone_order+0x1af/0x2a0 mm/compaction.c:2308 try_to_compact_pages+0x281/0xb70 mm/compaction.c:2360 __alloc_pages_direct_compact+0x154/0x460 mm/page_alloc.c:3902 __alloc_pages_slowpath+0x9b3/0x2520 mm/page_alloc.c:4537 __alloc_pages_nodemask+0x62e/0x8f0 mm/page_alloc.c:4745 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_vma+0x3c5/0x560 mm/mempolicy.c:2088 new_page+0x325/0x440 mm/mempolicy.c:1145 unmap_and_move mm/migrate.c:1173 [inline] migrate_pages+0x358/0x2e20 mm/migrate.c:1424 do_mbind mm/mempolicy.c:1256 [inline] kernel_mbind+0xaf1/0xd90 mm/mempolicy.c:1373 __do_sys_mbind mm/mempolicy.c:1380 [inline] __se_sys_mbind mm/mempolicy.c:1376 [inline] __x64_sys_mbind+0xe1/0x1a0 mm/mempolicy.c:1376 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007eff53488c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459829 RDX: 0000000000000001 RSI: 0000000000c00000 RDI: 0000000020012000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0002000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 00007eff534896d4 R13: 00000000004c5c8d R14: 00000000004da548 R15: 00000000ffffffff