INFO: task syz-executor.1:10099 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:23472 pid:10099 ppid: 6553 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 perf_event_free_task+0x585/0x6c0 kernel/events/core.c:12805 copy_process+0x4915/0x5c80 kernel/fork.c:2460 kernel_clone+0x230/0x7d0 kernel/fork.c:2584 __do_sys_fork+0xac/0x110 kernel/fork.c:2647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f49f7125739 RSP: 002b:00007f49f4639188 EFLAGS: 00000246 ORIG_RAX: 0000000000000039 RAX: ffffffffffffffda RBX: 00007f49f722a1a8 RCX: 00007f49f7125739 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f49f717fcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f49f722a1a8 R13: 00007ffc8ae5ef0f R14: 00007f49f4639300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8c91c200 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by in:imklog/6230: #0: ffff88801a8dcaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 #1: ffffffff8c91c200 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by agetty/6238: #0: ffff888019da4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900011ac2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113 5 locks held by kworker/u4:15/10159: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc54/0xca0 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2953 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:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:___might_sleep+0x1a5/0x690 kernel/sched/core.c:9506 Code: 71 0b 73 00 4c 89 f2 49 be 00 00 00 00 00 fc ff df 48 c7 84 24 a0 00 00 00 00 00 00 00 9c 8f 84 24 a0 00 00 00 42 80 3c 33 00 <74> 0e 4c 89 e7 48 89 d3 e8 be 0a 73 00 48 89 da f6 84 24 a1 00 00 RSP: 0018:ffffc9000b077960 EFLAGS: 00000246 RAX: 1ffff1100f77d400 RBX: 1ffff9200160ef40 RCX: ffff88807bbe9c80 RDX: ffff88807bbe9c80 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000b077a68 R08: ffffffff81dce31c R09: ffffed100ed1c2a5 R10: ffffed100ed1c2a5 R11: 0000000000000000 R12: ffffc9000b077a00 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200160ef34 FS: 00007f7650db08c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f764e1da000 CR3: 000000001adb8000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000d0eb DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: dput+0x42/0x6e0 fs/dcache.c:872 path_put fs/namei.c:557 [inline] terminate_walk+0x1c2/0x570 fs/namei.c:672 path_parentat fs/namei.c:2504 [inline] filename_parentat+0x2be/0x7b0 fs/namei.c:2519 filename_create+0xf4/0x4e0 fs/namei.c:3639 do_mkdirat+0xae/0x530 fs/namei.c:3900 __do_sys_mkdir fs/namei.c:3931 [inline] __se_sys_mkdir fs/namei.c:3929 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:3929 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f765006b687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffca97a9ef8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffca97acf60 RCX: 00007f765006b687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 000056329fed68a0 RBP: 00007ffca97a9f30 R08: 000056329e68e3e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 000056329fed68a0 R15: 00007ffca97aa570 ---------------- Code disassembly (best guess): 0: 71 0b jno 0xd 2: 73 00 jae 0x4 4: 4c 89 f2 mov %r14,%rdx 7: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 e: fc ff df 11: 48 c7 84 24 a0 00 00 movq $0x0,0xa0(%rsp) 18: 00 00 00 00 00 1d: 9c pushfq 1e: 8f 84 24 a0 00 00 00 popq 0xa0(%rsp) 25: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1) * 2a: 74 0e je 0x3a <-- trapping instruction 2c: 4c 89 e7 mov %r12,%rdi 2f: 48 89 d3 mov %rdx,%rbx 32: e8 be 0a 73 00 callq 0x730af5 37: 48 89 da mov %rbx,%rdx 3a: f6 .byte 0xf6 3b: 84 24 a1 test %ah,(%rcx,%riz,4)