INFO: task syz-executor.3:22956 blocked for more than 143 seconds. Not tainted 5.9.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:13728 pid:22956 ppid: 8841 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x37b/0x8c0 kernel/sched/core.c:4527 schedule+0x37/0xe0 kernel/sched/core.c:4602 perf_event_free_task+0x23c/0x280 kernel/events/core.c:12446 copy_process+0xb22/0x1d50 kernel/fork.c:2326 _do_fork+0x98/0x730 kernel/fork.c:2428 __do_sys_clone+0x66/0x80 kernel/fork.c:2545 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: Bad RIP value. RSP: 002b:00007f6352fafc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000002040 RCX: 000000000045deb9 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000100 RBP: 000000000118bf70 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffc4956ea3f R14: 00007f6352fb09c0 R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1308: #0: ffffffff84b0ee20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a kernel/locking/lockdep.c:5826 1 lock held by in:imklog/8044: #0: ffff88812fba0ef0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x45/0x50 fs/file.c:930 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1308 Comm: khungtaskd Not tainted 5.9.0-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:77 [inline] dump_stack+0x78/0xa0 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.8+0x3e/0x58 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xd5/0xec 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+0x58e/0x680 kernel/hung_task.c:295 kthread+0x147/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3109 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3128 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3183 [inline] RIP: 0010:__lock_acquire+0xa98/0x2ab0 kernel/locking/lockdep.c:4426 Code: 34 d5 60 c5 5e 86 49 89 d7 48 89 34 24 0f 84 86 01 00 00 4a 8b 04 fd 60 c5 5e 86 48 85 c0 74 1b 48 83 f8 08 74 15 48 8b 50 10 <49> 39 d5 0f 84 0f fb ff ff 48 8b 00 48 85 c0 75 e5 8b 35 e9 eb 73 RSP: 0018:ffffffff84a03c50 EFLAGS: 00000082 RAX: ffffffff85f33688 RBX: 00000000b91432e6 RCX: 00000000d165c30c RDX: ba4719117f6c87ac RSI: ffffffff86617258 RDI: 0000000055bf9380 RBP: ffffffff84a90080 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff84a90990 R13: 600de905542ab586 R14: 0000000000000000 R15: 000000000000559f FS: 0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6e25bc000 CR3: 000000012e580000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0xa7/0x3a0 kernel/locking/lockdep.c:5005 write_seqcount_t_begin_nested include/linux/seqlock.h:469 [inline] write_seqcount_t_begin include/linux/seqlock.h:495 [inline] psi_group_change+0x8f/0x320 kernel/sched/psi.c:707 psi_task_switch+0x143/0x180 kernel/sched/psi.c:833 psi_sched_switch kernel/sched/stats.h:144 [inline] __schedule+0x525/0x8c0 kernel/sched/core.c:4522 schedule_idle+0x19/0x30 kernel/sched/core.c:4630 do_idle+0x197/0x2d0 kernel/sched/idle.c:304 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:372 start_kernel+0x4af/0x4ce init/main.c:1048 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243