INFO: task syz-executor.1:20428 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27448 pid:20428 ppid: 6557 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_uring_cancel_generic+0x458/0x740 fs/io_uring.c:9750 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe0cd2ab739 RSP: 002b:00007fe0cca22218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007fe0cd3aff88 RCX: 00007fe0cd2ab739 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe0cd3aff88 RBP: 00007fe0cd3aff80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe0cd3aff8c R13: 00007fffa67e608f R14: 00007fe0cca22300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97fe20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by kworker/u4:5/1204: #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 #1: ffff8880b9d1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39d/0x480 kernel/sched/psi.c:880 1 lock held by in:imklog/6229: #0: ffff888024da0ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 5.15.0-rc1-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:chacha_permute+0x1ee/0x6e0 lib/crypto/chacha.c:26 Code: fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 b4 04 00 00 48 8b 44 24 30 48 8d 78 18 8b 58 08 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 RSP: 0018:ffffc90000def9c0 EFLAGS: 00000046 RAX: ffffc90000defa68 RBX: 0000000079622d32 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff83da0341 RDI: ffffc90000defa80 RBP: 0000000000000014 R08: 0000000000000000 R09: ffffc90000defaa7 R10: ffffffff83da030d R11: 0000000000000000 R12: 0000000034291a0d R13: 00000000d84497fc R14: 0000000000000000 R15: 0000000061707865 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51c22c9000 CR3: 000000007a989000 CR4: 0000000000350ee0 Call Trace: chacha_block_generic+0x98/0x250 lib/crypto/chacha.c:83 chacha20_block include/crypto/chacha.h:36 [inline] _extract_crng+0x12f/0x250 drivers/char/random.c:1000 extract_crng drivers/char/random.c:1016 [inline] _get_random_bytes+0x229/0x670 drivers/char/random.c:1538 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:692 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline] nsim_dev_trap_report_work+0x74e/0xbd0 drivers/net/netdevsim/dev.c:762 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: fa cli 1: 48 c1 ea 03 shr $0x3,%rdx 5: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx 9: 48 89 f8 mov %rdi,%rax c: 83 e0 07 and $0x7,%eax f: 83 c0 03 add $0x3,%eax 12: 38 d0 cmp %dl,%al 14: 7c 08 jl 0x1e 16: 84 d2 test %dl,%dl 18: 0f 85 b4 04 00 00 jne 0x4d2 1e: 48 8b 44 24 30 mov 0x30(%rsp),%rax 23: 48 8d 78 18 lea 0x18(%rax),%rdi 27: 8b 58 08 mov 0x8(%rax),%ebx * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 89 fa mov %rdi,%rdx 37: 48 c1 ea 03 shr $0x3,%rdx 3b: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx 3f: 48 rex.W