INFO: task kworker/u4:2:28 blocked for more than 143 seconds. Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:2 state:D stack:24864 pid: 28 ppid: 2 flags:0x00004000 Workqueue: events_unbound io_ring_exit_work Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1854 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:7284 [inline] io_sq_thread_park fs/io_uring.c:7278 [inline] io_sq_thread_stop+0xfe/0x570 fs/io_uring.c:7302 io_finish_async fs/io_uring.c:7320 [inline] io_ring_ctx_free fs/io_uring.c:8487 [inline] io_ring_exit_work+0x102/0x7a0 fs/io_uring.c:8581 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Showing all locks held in the system: 3 locks held by kworker/u4:2/28: #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888010069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2243 #1: ffffc90000e2fda8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2247 #2: ffff888024e29c70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7283 [inline] #2: ffff888024e29c70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park fs/io_uring.c:7278 [inline] #2: ffff888024e29c70 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_stop+0xd6/0x570 fs/io_uring.c:7302 1 lock held by khungtaskd/1663: #0: ffffffff8b33a7a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by systemd-udevd/4910: 1 lock held by in:imklog/8173: #0: ffff888021af00f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:923 1 lock held by syz-executor.0/8480: 2 locks held by syz-executor.1/8482: 1 lock held by syz-executor.5/8607: 3 locks held by kworker/u4:3/29649: 3 locks held by syz-executor.1/4083: 2 locks held by syz-executor.5/4084: 3 locks held by syz-executor.3/4085: 2 locks held by syz-executor.4/4086: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1663 Comm: khungtaskd Not tainted 5.10.0-rc6-next-20201201-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1135 Comm: kworker/u4:6 Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker RIP: 0010:check_memory_region+0xe/0x180 mm/kasan/generic.c:185 Code: f5 00 00 00 e9 13 42 24 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 03 42 24 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 <44> 0f b6 c2 49 01 f1 55 53 0f 82 18 01 00 00 48 b8 ff ff ff ff ff RSP: 0018:ffffc90004bdef00 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 000005ec501cd349 RCX: ffffffff83bb4c57 RDX: 0000000000000001 RSI: 0000000000000028 RDI: ffffc90004bdf3b8 RBP: ffffc90004bdf1c0 R08: 0000000000000000 R09: ffffc90004bdf3b8 R10: fffff5200097be3c R11: 000001cf5e70b1ae R12: 0000000000000028 R13: ffffc90004bdf3b8 R14: 0007ffffffffffff R15: 0004e96554d3107c FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1122330000 CR3: 0000000025aa0000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memcpy+0x39/0x60 mm/kasan/shadow.c:66 memcpy include/linux/string.h:447 [inline] fsquare_fsquare_times lib/crypto/curve25519-hacl64.c:287 [inline] addanddouble_fmonty lib/crypto/curve25519-hacl64.c:525 [inline] ladder_smallloop_cmult_small_loop_step lib/crypto/curve25519-hacl64.c:552 [inline] ladder_smallloop_cmult_small_loop_double_step lib/crypto/curve25519-hacl64.c:562 [inline] ladder_smallloop_cmult_small_loop lib/crypto/curve25519-hacl64.c:572 [inline] ladder_bigloop_cmult_big_loop lib/crypto/curve25519-hacl64.c:585 [inline] ladder_cmult.constprop.0+0x17e7/0x4c20 lib/crypto/curve25519-hacl64.c:599 curve25519_generic+0x2a4/0x5550 lib/crypto/curve25519-hacl64.c:781 curve25519_arch+0x1f7/0x230 arch/x86/crypto/curve25519-x86_64.c:1390