INFO: task syz-executor.2:10121 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:29000 pid:10121 ppid: 8429 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/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+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread_finish+0xa2/0x650 fs/io_uring.c:7127 io_sq_offload_create fs/io_uring.c:7928 [inline] io_uring_create fs/io_uring.c:9401 [inline] io_uring_setup+0x2234/0x2930 fs/io_uring.c:9484 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f82d01c2108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465f69 RDX: 0000000020ffc000 RSI: 0000000020000000 RDI: 00000000000065ec RBP: 0000000020000000 R08: 00000000200000c0 R09: 00000000200000c0 R10: 0000000020000080 R11: 0000000000000202 R12: 00000000200000c0 R13: 0000000020ffc000 R14: 0000000020000080 R15: 0000000020ffc000 Showing all locks held in the system: 6 locks held by kworker/u4:3/281: #0: ffff8880b9d35258 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x789/0xe50 kernel/sched/fair.c:10633 #1: ffffffff8bf71760 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1086 [inline] #1: ffffffff8bf71760 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x430 kernel/sched/fair.c:6045 #2: ffff8880b9d241d8 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:944 #3: ffffffff900cd370 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:656 #4: ffff8880b9d35258 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1321 [inline] #4: ffff8880b9d35258 (&rq->lock){-.-.}-{2:2}, at: ttwu_queue kernel/sched/core.c:3186 [inline] #4: ffff8880b9d35258 (&rq->lock){-.-.}-{2:2}, at: try_to_wake_up+0x5e6/0x14a0 kernel/sched/core.c:3466 #5: ffffffff900f4c40 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_active_state lib/debugobjects.c:922 [inline] #5: ffffffff900f4c40 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_active_state+0x10b/0x350 lib/debugobjects.c:909 1 lock held by khungtaskd/1646: #0: ffffffff8bf71760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 3 locks held by kworker/0:3/4887: #0: ffff8880b9c35258 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1321 [inline] #0: ffff8880b9c35258 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4992 #1: ffff8880b9c1f948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 #2: ffff8880b9c241d8 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:944 2 locks held by in:imklog/8108: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1646 Comm: khungtaskd Not tainted 5.12.0-rc2-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+0x141/0x1d7 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9005 Comm: kworker/1:3 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:memcpy_erms+0x0/0x10 arch/x86/lib/memcpy_64.S:53 Code: fe ff ff cc cc cc cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 <48> 89 f8 48 89 d1 f3 a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa RSP: 0018:ffffc90002087a30 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffffc90002087ba8 RCX: ffffffff83c71a0c RDX: 0000000000000040 RSI: ffff888011630b00 RDI: ffffc90002087a68 RBP: 0000000000000014 R08: 0000000000000001 R09: ffffc90002087aa7 R10: fffff52000410f54 R11: 0000000000000000 R12: ffff888011630b00 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888011630b00 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007febc7755008 CR3: 000000001360a000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memcpy include/linux/fortify-string.h:191 [inline] chacha_block_generic+0x8c/0x220 lib/crypto/chacha.c:81 chacha20_block include/crypto/chacha.h:36 [inline] _extract_crng+0x12f/0x250 drivers/char/random.c:1010 extract_crng drivers/char/random.c:1026 [inline] _get_random_bytes+0x229/0x670 drivers/char/random.c:1549 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:520 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x34c/0xbd0 drivers/net/netdevsim/dev.c:611 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294