INFO: task syz-executor948:8525 can't die for more than 143 seconds. syz-executor948 R running task 27424 8525 8523 0x00004006 Call Trace: context_switch kernel/sched/core.c:3268 [inline] __schedule+0x776/0x17d0 kernel/sched/core.c:3937 INFO: task syz-executor948:8530 can't die for more than 144 seconds. syz-executor948 R running task 28168 8530 8529 0x00004006 Call Trace: context_switch kernel/sched/core.c:3265 [inline] __schedule+0x76e/0x17d0 kernel/sched/core.c:3937 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4185 retint_kernel+0x1b/0x2b RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffff88808ddbfb10 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000cf6 RDX: 0000000000001000 RSI: 000000002060ac38 RDI: ffffc900067979b7 RBP: ffff88808ddbfb48 R08: fffff52000cf3000 R09: 0000000000000000 R10: fffff52000cf47ff R11: ffffc900067a3fff R12: 000000002060b281 R13: 000000002060c281 R14: ffffc900067a3000 R15: 00007ffffffff000 copy_from_user include/linux/uaccess.h:144 [inline] write_mem+0x137/0x210 drivers/char/mem.c:249 do_loop_readv_writev.part.0+0x2ac/0x460 fs/read_write.c:720 do_loop_readv_writev fs/read_write.c:706 [inline] do_iter_write fs/read_write.c:978 [inline] do_iter_write+0x2fa/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_pwritev+0x1c4/0x280 fs/read_write.c:1118 __do_sys_pwritev fs/read_write.c:1165 [inline] __se_sys_pwritev fs/read_write.c:1160 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1160 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441329 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc00d93af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441329 RDX: 0000000000000002 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000febfffff R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor948:8531 can't die for more than 145 seconds. syz-executor948 R running task 28168 8531 8526 0x00004006 Call Trace: context_switch kernel/sched/core.c:3265 [inline] __schedule+0x76e/0x17d0 kernel/sched/core.c:3937 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4185 retint_kernel+0x1b/0x2b RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffff888090bcfb10 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000009 RDX: 0000000000001000 RSI: 0000000020609735 RDI: ffffc900068114b4 RBP: ffff888090bcfb48 R08: fffff52000d02400 R09: 0000000000000000 R10: fffff52000d023ff R11: ffffc90006811fff R12: 0000000020609281 R13: 000000002060a281 R14: ffffc90006811000 R15: 00007ffffffff000 copy_from_user include/linux/uaccess.h:144 [inline] write_mem+0x137/0x210 drivers/char/mem.c:249 do_loop_readv_writev.part.0+0x2ac/0x460 fs/read_write.c:720 do_loop_readv_writev fs/read_write.c:706 [inline] do_iter_write fs/read_write.c:978 [inline] do_iter_write+0x2fa/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_pwritev+0x1c4/0x280 fs/read_write.c:1118 __do_sys_pwritev fs/read_write.c:1165 [inline] __se_sys_pwritev fs/read_write.c:1160 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1160 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441329 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc00d93af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441329 RDX: 0000000000000002 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000febfffff R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor948:8532 can't die for more than 146 seconds. syz-executor948 R running task 28168 8532 8524 0x00004006 Call Trace: context_switch kernel/sched/core.c:3268 [inline] __schedule+0x776/0x17d0 kernel/sched/core.c:3937 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4185 retint_kernel+0x1b/0x2b RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffff88809134fb10 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 00000000000007d0 RDX: 0000000000001000 RSI: 000000002061d437 RDI: ffffc900068871b6 RBP: ffff88809134fb48 R08: fffff52000d11000 R09: 0000000000000000 R10: fffff52000d10fff R11: ffffc90006887fff R12: 000000002061d281 R13: 000000002061e281 R14: ffffc90006887000 R15: 00007ffffffff000 copy_from_user include/linux/uaccess.h:144 [inline] write_mem+0x137/0x210 drivers/char/mem.c:249 do_loop_readv_writev.part.0+0x2ac/0x460 fs/read_write.c:720 do_loop_readv_writev fs/read_write.c:706 [inline] do_iter_write fs/read_write.c:978 [inline] do_iter_write+0x2fa/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_pwritev+0x1c4/0x280 fs/read_write.c:1118 __do_sys_pwritev fs/read_write.c:1165 [inline] __se_sys_pwritev fs/read_write.c:1160 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1160 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441329 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc00d93af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441329 RDX: 0000000000000002 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000febfffff R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor948:8533 can't die for more than 147 seconds. syz-executor948 R running task 28168 8533 8527 0x00004006 Call Trace: context_switch kernel/sched/core.c:3265 [inline] __schedule+0x76e/0x17d0 kernel/sched/core.c:3937 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4185 retint_kernel+0x1b/0x2b RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffff88808dc87b10 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000a14 RDX: 0000000000001000 RSI: 0000000020628255 RDI: ffffc900068ebfd4 RBP: ffff88808dc87b48 R08: fffff52000d1d800 R09: 0000000000000000 R10: fffff52000d1f7ff R11: ffffc900068fbfff R12: 0000000020628281 R13: 0000000020629281 R14: ffffc900068fb000 R15: 00007ffffffff000 copy_from_user include/linux/uaccess.h:144 [inline] write_mem+0x137/0x210 drivers/char/mem.c:249 do_loop_readv_writev.part.0+0x2ac/0x460 fs/read_write.c:720 do_loop_readv_writev fs/read_write.c:706 [inline] do_iter_write fs/read_write.c:978 [inline] do_iter_write+0x2fa/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_pwritev+0x1c4/0x280 fs/read_write.c:1118 __do_sys_pwritev fs/read_write.c:1165 [inline] __se_sys_pwritev fs/read_write.c:1160 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1160 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441329 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc00d93af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441329 RDX: 0000000000000002 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000febfffff R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor948:8534 can't die for more than 148 seconds. syz-executor948 R running task 28168 8534 8528 0x00004006 Call Trace: context_switch kernel/sched/core.c:3265 [inline] __schedule+0x76e/0x17d0 kernel/sched/core.c:3937 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4185 retint_kernel+0x1b/0x2b RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffff88808e357b10 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000b58 RDX: 0000000000001000 RSI: 0000000020628c53 RDI: ffffc9000696d9d2 RBP: ffff88808e357b48 R08: fffff52000d2dc00 R09: 0000000000000000 R10: fffff52000d2ebff R11: ffffc90006975fff R12: 0000000020629281 R13: 000000002062a281 R14: ffffc90006975000 R15: 00007ffffffff000 copy_from_user include/linux/uaccess.h:144 [inline] write_mem+0x137/0x210 drivers/char/mem.c:249 do_loop_readv_writev.part.0+0x2ac/0x460 fs/read_write.c:720 do_loop_readv_writev fs/read_write.c:706 [inline] do_iter_write fs/read_write.c:978 [inline] do_iter_write+0x2fa/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_pwritev+0x1c4/0x280 fs/read_write.c:1118 __do_sys_pwritev fs/read_write.c:1165 [inline] __se_sys_pwritev fs/read_write.c:1160 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1160 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441329 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc00d93af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441329 RDX: 0000000000000002 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000febfffff R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1063: #0: ffffffff88fa9ac0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5337 1 lock held by rsyslogd/8408: #0: ffff8880a1dc98e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8498: #0: ffff888091b4e390 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8499: #0: ffff8880876b8410 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8500: #0: ffff888087ac2e10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f532e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8501: #0: ffff888087ac3690 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f4f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8502: #0: ffff888096e91650 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f4b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8503: #0: ffff88808f734490 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f432e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/8504: #0: ffff8880942a4310 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1063 Comm: khungtaskd Not tainted 5.3.0-rc5-next-20190821 #70 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:269 [inline] watchdog+0xc99/0x1360 kernel/hung_task.c:353 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8530 Comm: syz-executor948 Not tainted 5.3.0-rc5-next-20190821 #70 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:205 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffff88808ddbfb10 EFLAGS: 00010206 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000a1e RDX: 0000000000001000 RSI: 0000000020642863 RDI: ffffc90006a1f5e2 RBP: ffff88808ddbfb48 R08: fffff52000d44000 R09: 0000000000000000 R10: fffff52000d43fff R11: ffffc90006a1ffff R12: 0000000020642281 R13: 0000000020643281 R14: ffffc90006a1f000 R15: 00007ffffffff000 FS: 00005555566ee880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000221b000 CR3: 0000000094aa8000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: copy_from_user include/linux/uaccess.h:144 [inline] write_mem+0x137/0x210 drivers/char/mem.c:249 do_loop_readv_writev.part.0+0x2ac/0x460 fs/read_write.c:720 do_loop_readv_writev fs/read_write.c:706 [inline] do_iter_write fs/read_write.c:978 [inline] do_iter_write+0x2fa/0x380 fs/read_write.c:957 vfs_writev+0x1b3/0x2f0 fs/read_write.c:1021 do_pwritev+0x1c4/0x280 fs/read_write.c:1118 __do_sys_pwritev fs/read_write.c:1165 [inline] __se_sys_pwritev fs/read_write.c:1160 [inline] __x64_sys_pwritev+0x9a/0xf0 fs/read_write.c:1160 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441329 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc00d93af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441329 RDX: 0000000000000002 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000febfffff R11: 0000000000000246 R12: 00000000004020a0 R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000