INFO: task syz-executor3:10110 blocked for more than 120 seconds. Not tainted 4.17.0-rc6+ #63 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D23120 10110 4571 0x00000004 Call Trace: context_switch kernel/sched/core.c:2859 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3501 schedule+0xef/0x430 kernel/sched/core.c:3545 io_schedule+0x1c/0x70 kernel/sched/core.c:5165 wait_on_page_bit_common+0x4dc/0x770 mm/filemap.c:1100 wait_on_page_bit mm/filemap.c:1133 [inline] wait_on_page_locked include/linux/pagemap.h:530 [inline] __lock_page_or_retry+0x4f7/0x600 mm/filemap.c:1311 lock_page_or_retry include/linux/pagemap.h:510 [inline] filemap_fault+0x7a2/0x2200 mm/filemap.c:2530 __do_fault+0xe6/0x430 mm/memory.c:3222 do_read_fault mm/memory.c:3632 [inline] do_fault mm/memory.c:3732 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x2ba6/0x4310 mm/memory.c:4087 handle_mm_fault+0x53a/0xc70 mm/memory.c:4124 faultin_page mm/gup.c:502 [inline] __get_user_pages+0x7d1/0x1a60 mm/gup.c:702 populate_vma_page_range+0x2db/0x3c0 mm/gup.c:1206 __mm_populate+0x2c6/0x500 mm/gup.c:1256 mm_populate include/linux/mm.h:2246 [inline] vm_mmap_pgoff+0x267/0x2a0 mm/util.c:362 ksys_mmap_pgoff+0x4c9/0x640 mm/mmap.c:1585 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007f841fb42c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f841fb436d4 RCX: 0000000000455a09 RDX: 0000000000000005 RSI: 0000000000004000 RDI: 0000000020ffa000 RBP: 000000000072bea0 R08: 0000000000000013 R09: 0000000000000000 R10: 0000000000008012 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000049f R14: 00000000006faf88 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/892: #0: 00000000e8f6cd63 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 00000000e8f6cd63 (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 00000000c55e5fa2 (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4490: #0: 00000000ae8ffc23 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000007ca70831 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4491: #0: 00000000d7455174 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000003cddddf3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4492: #0: 000000000c0231b5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000007f5f3517 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4493: #0: 0000000088331492 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f658b5dc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4494: #0: 000000003d7e8e1b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a1122c21 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4495: #0: 00000000f5d3d721 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000037976752 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/10125: #0: 000000006df19cca (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000005567c1ea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 892 Comm: khungtaskd Not tainted 4.17.0-rc6+ #63 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+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4397 Comm: rs:main Q:Reg Not tainted 4.17.0-rc6+ #63 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:69 [inline] RIP: 0010:write_comp_data+0x22/0x70 kernel/kcov.c:122 RSP: 0018:ffff8801b0e45ef8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8184d4a9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000005 RBP: ffff8801b0e45ef8 R08: ffff8801b17f0100 R09: ffffed003b5c46d2 R10: ffffed003b5c46d2 R11: ffff8801dae23693 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801c987c828 FS: 00007f21c305d700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b1c53000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __sanitizer_cov_trace_const_cmp4+0x16/0x20 kernel/kcov.c:188 bpf_jit_kallsyms_enabled include/linux/filter.h:870 [inline] bpf_prog_kallsyms_find+0xc9/0x4a0 kernel/bpf/core.c:491 is_bpf_text_address+0x7a/0x170 kernel/bpf/core.c:529 kernel_text_address+0x79/0xf0 kernel/extable.c:152 __kernel_text_address+0xd/0x40 kernel/extable.c:107 unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:18 __save_stack_trace+0x7e/0xd0 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 free_buffer_head+0xd2/0x170 fs/buffer.c:3364 try_to_free_buffers+0x35c/0x5e0 fs/buffer.c:3279 jbd2_journal_try_to_free_buffers+0x45c/0x580 fs/jbd2/transaction.c:2017 ext4_releasepage+0x1d5/0x5a0 fs/ext4/inode.c:3394 try_to_release_page+0x2c9/0x400 mm/filemap.c:3327 block_invalidatepage+0x3de/0x500 fs/buffer.c:1492 ext4_invalidatepage+0x196/0x550 fs/ext4/inode.c:3356 ext4_da_invalidatepage+0x1b5/0xf30 fs/ext4/inode.c:3201 do_invalidatepage mm/truncate.c:165 [inline] truncate_cleanup_page+0x335/0x560 mm/truncate.c:187 truncate_inode_pages_range+0x922/0x25a0 mm/truncate.c:367 truncate_inode_pages+0x24/0x30 mm/truncate.c:478 ext4_truncate_failed_write fs/ext4/truncate.h:15 [inline] ext4_da_write_begin+0x79c/0x1260 fs/ext4/inode.c:3094 generic_perform_write+0x39a/0x6a0 mm/filemap.c:3139 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3264 ext4_file_write_iter+0x388/0x1420 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f21c4abb19d RSP: 002b:00007f21c305be40 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000111 RCX: 00007f21c4abb19d RDX: 0000000000000111 RSI: 0000000001a19a90 RDI: 0000000000000005 RBP: 0000000001a19a90 R08: 34393278302f3962 R09: 5d3736393137392e R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f21c305c2c0 R14: 0000000000000003 R15: 0000000001a19890 Code: 72 3c 00 e9 86 fc ff ff 90 55 65 4c 8b 04 25 40 ee 01 00 65 8b 05 ef ac 88 7e 48 89 e5 a9 00 01 1f 00 75 51 41 8b 80 78 12 00 00 <83> f8 03 75 45 49 8b 80 80 12 00 00 45 8b 80 7c 12 00 00 4c 8b INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.486 msecs