INFO: task syz-executor.2:5606 blocked for more than 140 seconds. Not tainted 4.14.126+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28776 5606 1921 0x80000000 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21f/0x3c0 kernel/locking/rwsem-xadd.c:309 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:511 [inline] do_exit+0x503/0x2960 kernel/exit.c:861 INFO: task syz-executor.2:5608 blocked for more than 140 seconds. Not tainted 4.14.126+ #7 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29176 5608 1921 0x80000000 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21f/0x3c0 kernel/locking/rwsem-xadd.c:309 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:511 [inline] do_exit+0x503/0x2960 kernel/exit.c:861 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [< (ptrval)>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1761: #0: (&tty->ldisc_sem){++++}, at: [< (ptrval)>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [< (ptrval)>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/5606: #0: (&mm->mmap_sem){++++}, at: [< (ptrval)>] exit_mm kernel/exit.c:511 [inline] #0: (&mm->mmap_sem){++++}, at: [< (ptrval)>] do_exit+0x503/0x2960 kernel/exit.c:861 1 lock held by syz-executor.2/5608: #0: (&mm->mmap_sem){++++}, at: [< (ptrval)>] exit_mm kernel/exit.c:511 [inline] #0: (&mm->mmap_sem){++++}, at: [< (ptrval)>] do_exit+0x503/0x2960 kernel/exit.c:861 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.126+ #7 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5624 Comm: syz-executor.2 Not tainted 4.14.126+ #7 task: (ptrval) task.stack: (ptrval) RIP: 0010:__mutex_trylock_or_owner kernel/locking/mutex.c:111 [inline] RIP: 0010:__mutex_trylock kernel/locking/mutex.c:125 [inline] RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:758 [inline] RIP: 0010:__mutex_lock+0x687/0x1430 kernel/locking/mutex.c:893 RSP: 0018:ffff8881c5bafad0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000004 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff9ba0535c RBP: ffff8881c5bafc50 R08: ffffffff9f0206a0 R09: 0000000000040374 R10: ffff8881c61c3758 R11: 0000000000000001 R12: ffff8881c61c2f00 R13: fffffbfff3e040d4 R14: ffff8881c5932d60 R15: ffff8881c61c2f00 FS: 00007fb7c2aa2700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0ca9e5000 CR3: 00000001c73e2003 CR4: 00000000001606b0 Call Trace: perf_mmap+0x50c/0x1390 kernel/events/core.c:5416 call_mmap include/linux/fs.h:1793 [inline] mmap_region+0x7c9/0xf00 mm/mmap.c:1732 do_mmap+0x548/0xb80 mm/mmap.c:1510 do_mmap_pgoff include/linux/mm.h:2180 [inline] vm_mmap_pgoff+0x177/0x1c0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1560 [inline] SyS_mmap_pgoff+0xf4/0x1b0 mm/mmap.c:1518 do_syscall_64+0x19b/0x510 arch/x86/entry/common.c:292 Code: c0 03 38 c8 7c 08 84 c9 0f 85 ea 0c 00 00 8b 35 60 de 1c 02 85 f6 0f 84 b6 01 00 00 49 83 e4 fd 48 89 d8 4d 09 fc f0 4d 0f b1 26 <48> 39 c3 74 14 48 89 c3 e9 9c fa ff ff 48 8b bd e0 fe ff ff e8