BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 158s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=32/256 refcnt=33 in-flight: 22382:rtc_timer_do_work pending: nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, cache_reap, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, nfc_urelease_event_work, l2cap_chan_timeout, l2cap_chan_timeout, l2cap_chan_timeout, l2cap_chan_timeout, l2cap_chan_timeout, macvlan_process_broadcast, l2cap_chan_timeout, l2cap_chan_timeout, l2cap_chan_timeout workqueue events_long: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256 refcnt=4 pending: gc_worker, br_fdb_cleanup, br_fdb_cleanup workqueue events_freezable: flags=0x4 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: update_balloon_stats_func workqueue events_power_efficient: flags=0x80 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=5/256 refcnt=6 pending: fb_flashcursor, neigh_periodic_work, neigh_periodic_work, process_srcu, check_lifetime workqueue mm_percpu_wq: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: vmstat_update workqueue dm_bufio_cache: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: work_fn workqueue ipv6_addrconf: flags=0x40008 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=2 pending: addrconf_verify_work workqueue bat_events: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=6 pending: batadv_iv_send_outstanding_bat_ogm_packet delayed: batadv_iv_send_outstanding_bat_ogm_packet, batadv_iv_send_outstanding_bat_ogm_packet pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=158s workers=3 idle: 1398 5168 INFO: task syz-executor.5:18936 blocked for more than 140 seconds. Not tainted 4.14.288-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28912 18936 7996 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 debugfs_remove_recursive fs/debugfs/inode.c:744 [inline] debugfs_remove_recursive+0x2e0/0x3b0 fs/debugfs/inode.c:686 kvm_destroy_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:585 [inline] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:776 [inline] kvm_put_kvm+0xec/0xab0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:819 kvm_vm_release+0x3f/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:830 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fa932eead4b RSP: 002b:00007ffcdcbbb240 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007fa932eead4b RDX: 00007fa93304f2d8 RSI: ffffffffffffffff RDI: 0000000000000004 RBP: 00007fa93304c960 R08: 0000000000000000 R09: 00007fa93304f2e0 R10: 00007ffcdcbbb340 R11: 0000000000000293 R12: 00000000001a2a9e R13: 00007ffcdcbbb340 R14: 00007fa93304af60 R15: 0000000000000032 INFO: task syz-executor.1:18975 blocked for more than 140 seconds. Not tainted 4.14.288-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28912 18975 7998 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 debugfs_remove_recursive fs/debugfs/inode.c:744 [inline] debugfs_remove_recursive+0x2e0/0x3b0 fs/debugfs/inode.c:686 kvm_destroy_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:585 [inline] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:776 [inline] kvm_put_kvm+0xec/0xab0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:819 kvm_vm_release+0x3f/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:830 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fa1a04d5d4b RSP: 002b:00007ffcd15e94d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fa1a04d5d4b RDX: 00007fa1a063a360 RSI: ffffffffffffffff RDI: 0000000000000006 RBP: 00007fa1a0637960 R08: 0000000000000000 R09: 00007fa1a063a368 R10: 00007ffcd15e95d0 R11: 0000000000000293 R12: 00000000001a2b2a R13: 00007ffcd15e95d0 R14: 00007fa1a0635f60 R15: 0000000000000032 Showing all locks held in the system: 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.288-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4617 Comm: systemd-journal Not tainted 4.14.288-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 task: ffff8880a1b22680 task.stack: ffff8880a1b28000 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:796 [inline] RIP: 0010:quarantine_put+0x8/0x1f0 mm/kasan/quarantine.c:186 RSP: 0018:ffff8880a1b2f9a0 EFLAGS: 00000086 RAX: 00000000dc6001e4 RBX: ffff888093315200 RCX: 0000000000000007 RDX: 00000000000000ff RSI: ffff88823f8c1200 RDI: ffff888093314200 RBP: ffff8880a1b2fbd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a1b22680 R12: ffff88823f8c1200 R13: ffff888093314200 R14: ffff8880a1b2fea8 R15: ffff8880a1b2fc78 FS: 00007f91b6fc68c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f91b3e06000 CR3: 00000000a1ed3000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_slab_free+0x12d/0x1a0 mm/kasan/kasan.c:525 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 putname+0xcd/0x110 fs/namei.c:259 filename_parentat+0x477/0x520 fs/namei.c:2430 filename_create+0x8a/0x3f0 fs/namei.c:3657 user_path_create fs/namei.c:3732 [inline] SYSC_mkdirat fs/namei.c:3864 [inline] SyS_mkdirat+0x95/0x270 fs/namei.c:3856 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f91b6281687 RSP: 002b:00007ffc26f787c8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffc26f7b830 RCX: 00007f91b6281687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000558a2ca368a0 RBP: 00007ffc26f78800 R08: 0000558a2adc83e5 R09: 0000000000000018 R10: 0000558a2ca3ed20 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 0000558a2ca368a0 R15: 00007ffc26f78e40 Code: cc 88 48 89 df e8 e9 fe ff ff 48 89 ee 48 89 e7 e8 9e fd ff ff 48 83 c4 18 5b 5d c3 0f 1f 80 00 00 00 00 48 83 3d 18 93 71 07 00 <0f> 84 c9 00 00 00 41 55 41 54 55 53 9c 58 0f 1f 44 00 00 48 83 ---------------- Code disassembly (best guess): 0: cc int3 1: 88 48 89 mov %cl,-0x77(%rax) 4: df e8 fucomip %st(0),%st 6: e9 fe ff ff 48 jmpq 0x49000009 b: 89 ee mov %ebp,%esi d: 48 89 e7 mov %rsp,%rdi 10: e8 9e fd ff ff callq 0xfffffdb3 15: 48 83 c4 18 add $0x18,%rsp 19: 5b pop %rbx 1a: 5d pop %rbp 1b: c3 retq 1c: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 23: 48 83 3d 18 93 71 07 cmpq $0x0,0x7719318(%rip) # 0x7719343 2a: 00 * 2b: 0f 84 c9 00 00 00 je 0xfa <-- trapping instruction 31: 41 55 push %r13 33: 41 54 push %r12 35: 55 push %rbp 36: 53 push %rbx 37: 9c pushfq 38: 58 pop %rax 39: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 3e: 48 rex.W 3f: 83 .byte 0x83