INFO: task syz-executor.4:28445 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28512 pid:28445 ppid: 8731 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4373 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5124 schedule+0xcf/0x270 kernel/sched/core.c:5203 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x163/0x260 kernel/sched/completion.c:138 kthread_park+0x122/0x1b0 kernel/kthread.c:557 io_sq_thread_park fs/io_uring.c:7415 [inline] io_sq_thread_park fs/io_uring.c:7409 [inline] io_uring_cancel_task_requests fs/io_uring.c:8937 [inline] __io_uring_files_cancel+0x2d5/0xfe0 fs/io_uring.c:9032 io_uring_files_cancel include/linux/io_uring.h:51 [inline] do_exit+0x2fe/0x2ae0 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x3e9/0x20a0 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:150 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:301 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:312 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f78bd643c68 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: fffffffffffffffc RBX: 0000000000000002 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000020004b80 RDI: 00000000000035c6 RBP: 000000000119bfb8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff608ddebf R14: 00007f78bd6449c0 R15: 000000000119bf8c Showing all locks held in the system: 1 lock held by khungtaskd/1665: #0: ffffffff8b370ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259 1 lock held by systemd-journal/4871: 1 lock held by in:imklog/8141: 1 lock held by syz-executor.4/28445: #0: ffff88804e615470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7414 [inline] #0: ffff88804e615470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7409 [inline] #0: ffff88804e615470 (&sqd->lock){+.+.}-{3:3}, at: io_uring_cancel_task_requests fs/io_uring.c:8937 [inline] #0: ffff88804e615470 (&sqd->lock){+.+.}-{3:3}, at: __io_uring_files_cancel+0x2b8/0xfe0 fs/io_uring.c:9032 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4871 Comm: systemd-journal Not tainted 5.11.0-rc3-next-20210115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lt_find include/linux/rbtree_latch.h:109 [inline] RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:208 [inline] RIP: 0010:bpf_ksym_find+0x86/0x1c0 kernel/bpf/core.c:667 Code: ff 8b 1d 5d 4b 82 09 44 8b 74 24 04 89 de 44 89 f7 e8 7e 66 f4 ff 41 39 de 0f 84 e3 00 00 00 e8 d0 60 f4 ff 8b 15 3a 4b 82 09 <89> d0 41 89 d4 89 54 24 04 83 e0 01 41 83 e4 01 48 8d 3c c5 b0 f3 RSP: 0018:ffffc90000dc0888 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: 0000000000000058 RSI: ffffffff817ea840 RDI: 00007fc7a79b1840 RBP: 00007fc7a79b1840 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff817efc17 R11: 0000000000000000 R12: ffffc90000dc09e0 R13: dffffc0000000000 R14: ffff888011410000 R15: 0000000000000001 FS: 00007fc7a84218c0(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc7a591b000 CR3: 0000000011f5f000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: is_bpf_text_address+0x75/0x160 kernel/bpf/core.c:701 kernel_text_address kernel/extable.c:151 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xf00 kernel/workqueue.c:1497 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1471 [inline] __run_timers.part.0+0x4a6/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:qlink_free mm/kasan/quarantine.c:144 [inline] RIP: 0010:qlist_free_all+0x50/0xc0 mm/kasan/quarantine.c:165 Code: 49 89 fd 49 bc 00 00 00 00 00 fc ff df eb 2d 48 63 87 c0 00 00 00 48 c7 c2 f5 f9 b5 81 4c 8b 3e 48 29 c6 48 89 f0 48 c1 e8 03 <42> c6 04 20 fb e8 96 c4 ff ff 4d 85 ff 74 3b 4c 89 fe 48 85 ed 48 RSP: 0018:ffffc900013bf9b8 EFLAGS: 00010a06 RAX: 1ffff1100efbc278 RBX: ffff888012132780 RCX: dead0000000000ff RDX: ffffffff81b5f9f5 RSI: ffff888077de13c0 RDI: ffff8881406f7c80 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002e R10: ffffffff8132e09a R11: 000000000000003f R12: dffffc0000000000 R13: ffffc900013bf9f0 R14: ffffea0000000000 R15: ffff8880149b2500 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 ____kasan_kmalloc.constprop.0+0xb8/0xd0 mm/kasan/common.c:414 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc_node mm/slub.c:2903 [inline] slab_alloc mm/slub.c:2911 [inline] kmem_cache_alloc+0x155/0x370 mm/slub.c:2916 kmem_cache_zalloc include/linux/slab.h:676 [inline] __alloc_file+0x21/0x280 fs/file_table.c:101 alloc_empty_file+0x6d/0x170 fs/file_table.c:150 path_openat+0xe3/0x2720 fs/namei.c:3355 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1178 do_sys_open fs/open.c:1194 [inline] __do_sys_open fs/open.c:1202 [inline] __se_sys_open fs/open.c:1198 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1198 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc7a79b1840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffce31db748 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffce31dba50 RCX: 00007fc7a79b1840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000563ed49b24e0 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000563ed49a5040 R14: 00007ffce31dba10 R15: 0000563ed49b2e70