INFO: task syz-executor.1:14637 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27840 14637 16656 0x80000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 free_pgtables+0x78/0x1c0 mm/memory.c:630 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2426 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4144ba RSP: 002b:00007ffe0d5a5f78 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 000000000000392e RCX: 00000000004144ba RDX: 0000000040000000 RSI: 00007ffe0d5a5f84 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 000000000000392d R09: 0000000001d9c940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416180 R13: 00007ffe0d5a6208 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.0:14649 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27840 14649 16656 0x80000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 free_pgtables+0x78/0x1c0 mm/memory.c:630 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2426 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4144ba RSP: 002b:00007ffc0a0f2f28 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000003948 RCX: 00000000004144ba RDX: 0000000040000000 RSI: 00007ffc0a0f2f34 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 0000000000003939 R09: 00000000016cf940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416180 R13: 00007ffc0a0f31b8 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:14650 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28400 14650 1789 0x80000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 free_pgtables+0x78/0x1c0 mm/memory.c:630 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2426 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4144ba RSP: 002b:00007ffe3a941ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 000000000000393d RCX: 00000000004144ba RDX: 0000000040000000 RSI: 00007ffe3a941f04 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 000000000000393a R09: 0000000000ca9940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416180 R13: 00007ffe3a942188 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.2:14652 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27840 14652 1777 0x80000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 free_pgtables+0x78/0x1c0 mm/memory.c:630 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2426 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4144ba RSP: 002b:00007ffea049b3b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 000000000000393e RCX: 00000000004144ba RDX: 0000000040000000 RSI: 00007ffea049b3c4 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 000000000000393c R09: 00000000020f2940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416180 R13: 00007ffea049b648 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:14653 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25312 14653 14650 0x00000000 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] dup_mmap kernel/fork.c:686 [inline] dup_mm kernel/fork.c:1213 [inline] copy_mm kernel/fork.c:1268 [inline] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 copy_process kernel/fork.c:1679 [inline] _do_fork+0x197/0xce0 kernel/fork.c:2220 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c4a RSP: 002b:00007ffe3a941cd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffe3a941cd0 RCX: 0000000000458c4a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffe3a941d10 R08: 0000000000000001 R09: 0000000000ca9940 R10: 0000000000ca9c10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe3a941d60 INFO: task syz-executor.0:14664 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25200 14664 14649 0x00000000 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] dup_mmap kernel/fork.c:686 [inline] dup_mm kernel/fork.c:1213 [inline] copy_mm kernel/fork.c:1268 [inline] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 copy_process kernel/fork.c:1679 [inline] _do_fork+0x197/0xce0 kernel/fork.c:2220 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c4a RSP: 002b:00007ffc0a0f2d00 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffc0a0f2d00 RCX: 0000000000458c4a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffc0a0f2d40 R08: 0000000000000001 R09: 00000000016cf940 R10: 00000000016cfc10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffc0a0f2d90 INFO: task syz-executor.3:14665 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D25312 14665 14651 0x00000000 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] dup_mmap kernel/fork.c:686 [inline] dup_mm kernel/fork.c:1213 [inline] copy_mm kernel/fork.c:1268 [inline] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 copy_process kernel/fork.c:1679 [inline] _do_fork+0x197/0xce0 kernel/fork.c:2220 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c4a RSP: 002b:00007ffff53fe0f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffff53fe0f0 RCX: 0000000000458c4a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffff53fe130 R08: 0000000000000001 R09: 00000000016ff940 R10: 00000000016ffc10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffff53fe180 INFO: task syz-executor.5:19568 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28704 19568 1777 0x80000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 free_pgtables+0x78/0x1c0 mm/memory.c:630 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2426 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4144ba RSP: 002b:00007ffec5952a38 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000004c71 RCX: 00000000004144ba RDX: 0000000040000000 RSI: 00007ffec5952a44 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 0000000000004c70 R09: 000000000232a940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416180 R13: 00007ffec5952cc8 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.2:26408 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28640 26408 14654 0x80000000 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x3ee/0x7c0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 i_mmap_lock_write include/linux/fs.h:475 [inline] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 free_pgtables+0xb3/0x1c0 mm/memory.c:644 exit_mmap+0x222/0x440 mm/mmap.c:3078 __mmput kernel/fork.c:940 [inline] mmput+0xeb/0x370 kernel/fork.c:961 exit_mm kernel/exit.c:545 [inline] do_exit+0x905/0x2a20 kernel/exit.c:862 do_group_exit+0x100/0x2e0 kernel/exit.c:978 get_signal+0x39f/0x1cc0 kernel/signal.c:2426 do_signal+0x96/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x3a3/0x520 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a679 RSP: 002b:00007f76f2ee4cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000075c1c8 RCX: 000000000045a679 RDX: 00000000004c0064 RSI: 0000000000000081 RDI: 000000000075c1cc RBP: 000000000075c1c0 R08: 0000000000000011 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000075c1cc R13: 00007ffea049afaf R14: 00007f76f2ee59c0 R15: 000000000075c1cc INFO: task syz-executor.5:26392 blocked for more than 140 seconds. Not tainted 4.14.156-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28624 26392 19569 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x22a/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 __do_page_fault+0x8a4/0xbb0 arch/x86/mm/fault.c:1356 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1122 RIP: 108bdc:0x108c09 RSP: 03e8:000000000000002d EFLAGS: 0075bf20 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000da9ed112>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 2 locks held by getty/1757: #0: (&tty->ldisc_sem){++++}, at: [<0000000014eb8b56>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000080bf8970>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/14637: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 1 lock held by syz-executor.0/14649: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 1 lock held by syz-executor.4/14650: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 1 lock held by syz-executor.3/14651: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 1 lock held by syz-executor.2/14652: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 4 locks held by syz-executor.4/14653: #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mmap kernel/fork.c:611 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mm kernel/fork.c:1213 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_mm kernel/fork.c:1268 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_process.part.0+0x1ff5/0x66c0 kernel/fork.c:1895 #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mmap kernel/fork.c:612 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mm kernel/fork.c:1213 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_mm kernel/fork.c:1268 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_process.part.0+0x2011/0x66c0 kernel/fork.c:1895 #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mmap kernel/fork.c:621 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mm kernel/fork.c:1213 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_mm kernel/fork.c:1268 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_process.part.0+0x204c/0x66c0 kernel/fork.c:1895 #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mmap kernel/fork.c:686 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mm kernel/fork.c:1213 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_mm kernel/fork.c:1268 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 4 locks held by syz-executor.0/14664: #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mmap kernel/fork.c:611 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mm kernel/fork.c:1213 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_mm kernel/fork.c:1268 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_process.part.0+0x1ff5/0x66c0 kernel/fork.c:1895 #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mmap kernel/fork.c:612 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mm kernel/fork.c:1213 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_mm kernel/fork.c:1268 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_process.part.0+0x2011/0x66c0 kernel/fork.c:1895 #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mmap kernel/fork.c:621 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mm kernel/fork.c:1213 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_mm kernel/fork.c:1268 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_process.part.0+0x204c/0x66c0 kernel/fork.c:1895 #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mmap kernel/fork.c:686 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mm kernel/fork.c:1213 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_mm kernel/fork.c:1268 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 4 locks held by syz-executor.3/14665: #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mmap kernel/fork.c:611 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mm kernel/fork.c:1213 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_mm kernel/fork.c:1268 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_process.part.0+0x1ff5/0x66c0 kernel/fork.c:1895 #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mmap kernel/fork.c:612 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mm kernel/fork.c:1213 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_mm kernel/fork.c:1268 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_process.part.0+0x2011/0x66c0 kernel/fork.c:1895 #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mmap kernel/fork.c:621 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mm kernel/fork.c:1213 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_mm kernel/fork.c:1268 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_process.part.0+0x204c/0x66c0 kernel/fork.c:1895 #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mmap kernel/fork.c:686 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mm kernel/fork.c:1213 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_mm kernel/fork.c:1268 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 1 lock held by syz-executor.5/19568: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 1 lock held by syz-executor.2/26408: #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [<00000000796cc89e>] unlink_file_vma+0x6e/0xa0 mm/mmap.c:158 1 lock held by syz-executor.5/26392: #0: (&mm->mmap_sem){++++}, at: [<00000000e1bfedbb>] __do_page_fault+0x8a4/0xbb0 arch/x86/mm/fault.c:1356 4 locks held by syz-executor.5/26393: #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mmap kernel/fork.c:611 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] dup_mm kernel/fork.c:1213 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_mm kernel/fork.c:1268 [inline] #0: (&dup_mmap_sem){.+.+}, at: [<00000000f0602bb8>] copy_process.part.0+0x1ff5/0x66c0 kernel/fork.c:1895 #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mmap kernel/fork.c:612 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] dup_mm kernel/fork.c:1213 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_mm kernel/fork.c:1268 [inline] #1: (&mm->mmap_sem){++++}, at: [<0000000079150655>] copy_process.part.0+0x2011/0x66c0 kernel/fork.c:1895 #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mmap kernel/fork.c:621 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] dup_mm kernel/fork.c:1213 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_mm kernel/fork.c:1268 [inline] #2: (&mm->mmap_sem/1){+.+.}, at: [<00000000e2627649>] copy_process.part.0+0x204c/0x66c0 kernel/fork.c:1895 #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] i_mmap_lock_write include/linux/fs.h:475 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mmap kernel/fork.c:686 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] dup_mm kernel/fork.c:1213 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_mm kernel/fork.c:1268 [inline] #3: (&mapping->i_mmap_rwsem){++++}, at: [<00000000dbdf2b7e>] copy_process.part.0+0x246a/0x66c0 kernel/fork.c:1895 1 lock held by syz-executor.5/26394: #0: (&mm->mmap_sem){++++}, at: [<00000000c816d544>] exit_mm kernel/exit.c:511 [inline] #0: (&mm->mmap_sem){++++}, at: [<00000000c816d544>] do_exit+0x575/0x2a20 kernel/exit.c:862 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.156-syzkaller #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xe5/0x154 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x119/0x147 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x629/0xbe0 kernel/hung_task.c:274 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26400 Comm: syz-executor.1 Not tainted 4.14.156-syzkaller #0 task: 000000009e42f93e task.stack: 000000007f063f7b RIP: 0010:__lock_acquire+0x3d/0x4320 kernel/locking/lockdep.c:3344 RSP: 0018:ffff8881dba07970 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffffa0ee3948 RBP: ffff8881dba07b38 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffffa1230a6b R12: 0000000000000002 R13: 0000000000000001 R14: 0000000000000002 R15: ffffffffa0ee3948 FS: 00007fdc71b0c700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2a7be55140 CR3: 000000017fd28002 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x12b/0x360 kernel/locking/lockdep.c:3994 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get kernel/time/timekeeping.c:760 [inline] ktime_get+0x68/0x1b0 kernel/time/timekeeping.c:750 hrtimer_forward_now include/linux/hrtimer.h:452 [inline] perf_swevent_hrtimer+0x2d6/0x390 kernel/events/core.c:8751 __run_hrtimer kernel/time/hrtimer.c:1259 [inline] __hrtimer_run_queues+0x28b/0xc40 kernel/time/hrtimer.c:1323 hrtimer_interrupt+0x1bd/0x490 kernel/time/hrtimer.c:1357 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x147/0x650 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x170/0x360 kernel/locking/lockdep.c:3997 RSP: 0018:ffff88817fcb7870 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: ffff88819bc6af00 RCX: 1ffff1103378d6fe RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000246 RBP: ffffffffa0ed52a0 R08: 0000000000000000 R09: 0000000000000004 R10: ffff88819bc6b7d0 R11: d91fa163c028be98 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] lock_page_memcg+0x36/0x290 mm/memcontrol.c:1669 page_remove_file_rmap mm/rmap.c:1211 [inline] page_remove_rmap+0x160/0x4c0 mm/rmap.c:1296 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1444 [inline] zap_pud_range mm/memory.c:1473 [inline] zap_p4d_range mm/memory.c:1494 [inline] unmap_page_range+0xa26/0x1320 mm/memory.c:1515 unmap_single_vma+0x118/0x170 mm/memory.c:1560 zap_page_range_single+0x206/0x2a0 mm/memory.c:1651 unmap_mapping_range_vma mm/memory.c:2791 [inline] unmap_mapping_range_tree mm/memory.c:2812 [inline] unmap_mapping_range+0x212/0x290 mm/memory.c:2859 truncate_pagecache+0x51/0x90 mm/truncate.c:760 simple_setattr+0xc6/0xf0 fs/libfs.c:413 notify_change2+0xbea/0xd80 fs/attr.c:317 do_truncate2+0x11e/0x1e0 fs/open.c:63 do_sys_ftruncate.constprop.0+0x34f/0x4a0 fs/open.c:214 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a679 RSP: 002b:00007fdc71b0bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045a679 RDX: 0000000000000000 RSI: 0000000000008200 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdc71b0c6d4 R13: 00000000004c1322 R14: 00000000004d4808 R15: 00000000ffffffff Code: 41 89 cc 53 89 d3 48 ba 00 00 00 00 00 fc ff df 48 83 e4 f0 48 81 ec a0 01 00 00 48 8b 45 10 48 c7 84 24 a0 00 00 00 b3 8a b5 41 <48> c7 84 24 a8 00 00 00 48 7f c4 a0 48 c7 84 24 b0 00 00 00 60