INFO: task syz-executor498:8201 blocked for more than 140 seconds. Not tainted 4.14.75+ #18 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor498 D28920 8201 1957 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x21a/0x3d0 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 __do_page_fault+0x868/0xb60 arch/x86/mm/fault.c:1361 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104 RIP: 6e1320:0x2d RSP: 0001:00007ffdfd0ffd90 EFLAGS: 00000001 INFO: task syz-executor498:8208 blocked for more than 140 seconds. Not tainted 4.14.75+ #18 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor498 D28856 8208 1957 0x80000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x21a/0x3d0 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:510 [inline] do_exit+0x512/0x2800 kernel/exit.c:852 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x447209 RSP: 002b:00007fb46a086da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dcc28 RCX: 0000000000447209 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc28 RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c R13: 6e69752f7665642f R14: 00007fb46a0879c0 R15: 0000000000000000 INFO: task syz-executor498:8214 blocked for more than 140 seconds. Not tainted 4.14.75+ #18 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor498 D29488 8214 1957 0x80000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x21a/0x3d0 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x45/0xa0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:510 [inline] do_exit+0x512/0x2800 kernel/exit.c:852 do_group_exit+0x100/0x2e0 kernel/exit.c:968 get_signal+0x4e5/0x1470 kernel/signal.c:2348 do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x447209 RSP: 002b:00007fb46a044da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dcc48 RCX: 0000000000447209 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc48 RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 6e69752f7665642f R14: 00007fb46a0459c0 R15: 0000000000000003 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1759: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 1 lock held by syz-executor498/8201: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x868/0xb60 arch/x86/mm/fault.c:1361 1 lock held by syz-executor498/8208: #0: (&mm->mmap_sem){++++}, at: [] exit_mm kernel/exit.c:510 [inline] #0: (&mm->mmap_sem){++++}, at: [] do_exit+0x512/0x2800 kernel/exit.c:852 1 lock held by syz-executor498/8214: #0: (&mm->mmap_sem){++++}, at: [] exit_mm kernel/exit.c:510 [inline] #0: (&mm->mmap_sem){++++}, at: [] do_exit+0x512/0x2800 kernel/exit.c:852 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.75+ #18 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8212 Comm: syz-executor498 Not tainted 4.14.75+ #18 task: ffff8801da9d2f00 task.stack: ffff8801cdd60000 RIP: 0010:preempt_latency_start kernel/sched/core.c:3141 [inline] RIP: 0010:preempt_count_add+0xa7/0x130 kernel/sched/core.c:3164 RSP: 0018:ffff8801cdd67a80 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffffffae649df1 RCX: 1ffff1003b53a6e5 RDX: 1ffff1003b53a805 RSI: 0000000000000000 RDI: ffff8801da9d4028 RBP: ffff8801cdd67a90 R08: ffffffffad200234 R09: 0000000000000000 R10: ffff8801cdd67c40 R11: 0000000000000000 R12: ffff8801da9d2f00 R13: 0000000000000000 R14: ffff8801cdf3cf60 R15: ffffffffad200234 FS: 00007fb46a066700(0000) GS:ffff8801db800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001f88 CR3: 00000001cde9c004 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock_common kernel/locking/mutex.c:755 [inline] __mutex_lock+0xd1/0x1480 kernel/locking/mutex.c:893 perf_mmap+0x514/0x1370 kernel/events/core.c:5402 call_mmap include/linux/fs.h:1787 [inline] mmap_region+0x836/0xfb0 mm/mmap.c:1731 do_mmap+0x551/0xb80 mm/mmap.c:1509 do_mmap_pgoff include/linux/mm.h:2167 [inline] vm_mmap_pgoff+0x180/0x1d0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1559 [inline] SyS_mmap_pgoff+0xf8/0x1a0 mm/mmap.c:1517 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x447209 RSP: 002b:00007fb46a065d98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dcc38 RCX: 0000000000447209 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020bf0000 RBP: 00000000006dcc30 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000004011 R11: 0000000000000212 R12: 00000000006dcc3c R13: 6e69752f7665642f R14: 00007fb46a0669c0 R15: 0000000000000001 Code: 00 85 c0 75 35 65 4c 8b 24 25 c0 de 01 00 49 8d bc 24 28 11 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 6b 49 89 9c 24 28 11 00 00 5b 41 5c 5d c3 31 ff 31 db e8 61