INFO: task syz-executor.5:12538 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.5 state:D stack:27144 pid:12538 ppid: 11078 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 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 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+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1181 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1216 io_uring_clean_tctx fs/io_uring.c:9614 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9694 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: 0033:0x4665f9 RSP: 002b:00007f3c54c06188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000709 RBX: 000000000056c038 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007fff9d1b473f R14: 00007f3c54c06300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6446: #0: ffff88807ea178f0 (&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: 2964 Comm: systemd-journal Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:375 [inline] RIP: 0010:__rcu_read_lock+0x27/0xf0 kernel/rcu/tree_plugin.h:398 Code: 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 53 65 48 8b 1c 25 40 f0 01 00 48 8d bb d4 03 00 00 48 89 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 9e 00 00 00 65 RSP: 0018:ffffc90002b87ef8 EFLAGS: 00000a07 RAX: dffffc0000000000 RBX: ffff88801148a340 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff814bfa53 RDI: ffff88801148a714 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8175c612 R11: 0000000000000000 R12: ffff88801148a340 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fde7c9068c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fde79dd6000 CR3: 00000000771a7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock include/linux/rcupdate.h:685 [inline] __task_pid_nr_ns+0x18/0x4b0 kernel/pid.c:497 task_tgid_vnr include/linux/sched.h:1589 [inline] __do_sys_getpid+0x1a/0x20 kernel/sys.c:926 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fde7bb9ef17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffd32348608 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 0000562aea9d9200 RCX: 00007fde7bb9ef17 RDX: 0000000000000000 RSI: 000000002268c0a9 RDI: 0000562aea9d9200 RBP: 0000000000000b94 R08: 0000562aea9db238 R09: 0000562aea9d97d8 R10: 0000562aea9d97a0 R11: 0000000000000206 R12: ffffffffffffffff R13: 00007ffd323486b8 R14: 0000562ae9b42958 R15: 0005cbf94baf5f27 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 7: fc ff df a: 55 push %rbp b: 53 push %rbx c: 65 48 8b 1c 25 40 f0 mov %gs:0x1f040,%rbx 13: 01 00 15: 48 8d bb d4 03 00 00 lea 0x3d4(%rbx),%rdi 1c: 48 89 fa mov %rdi,%rdx 1f: 48 c1 ea 03 shr $0x3,%rdx 23: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx * 27: 48 89 f8 mov %rdi,%rax <-- trapping instruction 2a: 83 e0 07 and $0x7,%eax 2d: 83 c0 03 add $0x3,%eax 30: 38 d0 cmp %dl,%al 32: 7c 08 jl 0x3c 34: 84 d2 test %dl,%dl 36: 0f 85 9e 00 00 00 jne 0xda 3c: 65 gs