INFO: task syz-executor231:8559 blocked for more than 143 seconds. Not tainted 5.2.0-rc5-next-20190617 #16 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor231 D28264 8559 8552 0x00000004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7c5/0x1560 kernel/sched/core.c:3444 schedule+0xa8/0x260 kernel/sched/core.c:3508 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:495 [inline] rwsem_down_read_failed+0x213/0x460 kernel/locking/rwsem-xadd.c:515 __down_read kernel/locking/rwsem.h:178 [inline] down_read+0xa5/0x1e0 kernel/locking/rwsem.c:26 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] __do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1504 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1535 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1161 RIP: 0033:0x4ab7ed Code: Bad RIP value. RSP: 002b:00007ffe2001cde0 EFLAGS: 00010202 RAX: 00000000004ab910 RBX: 0000000000000001 RCX: 00000000006e0330 RDX: 0000000000407670 RSI: 0000000000000000 RDI: 00000000004ccc10 RBP: 00007ffe2001ce00 R08: 000000037ffffa00 R09: 000000037ffffa00 R10: 00007ffe2001ce70 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000006e0320 R14: 000000000000002d R15: 20c49ba5e353f7cf Showing all locks held in the system: 1 lock held by khungtaskd/1045: #0: 0000000074cdff92 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 3 locks held by rs:main Q:Reg/8435: #0: 000000002c33c214 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1158 [inline] #0: 000000002c33c214 (&rq->lock){-.-.}, at: __schedule+0x1f5/0x1560 kernel/sched/core.c:3396 #1: 0000000074cdff92 (rcu_read_lock){....}, at: file_ctx security/apparmor/include/file.h:33 [inline] #1: 0000000074cdff92 (rcu_read_lock){....}, at: aa_file_perm+0x125/0xeb0 security/apparmor/file.c:607 #2: 0000000000c74f15 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:798 [inline] #2: 0000000000c74f15 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x246/0x1070 fs/ext4/file.c:232 1 lock held by rsyslogd/8437: #0: 000000001c4690ad (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8527: #0: 000000009d982e69 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e9843638 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8528: #0: 00000000862d2a40 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000db8272e5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8529: #0: 00000000ceffd710 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006b526baf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8530: #0: 00000000d30aa397 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000012312a38 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8531: #0: 00000000804d85cc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000004023033 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8532: #0: 00000000b01b81d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009d8258d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8533: #0: 00000000b257a49f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000850ee8ef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor231/8559: #0: 000000000e8b3ec3 (&mm->mmap_sem#2){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] #0: 000000000e8b3ec3 (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1504 2 locks held by syz-executor231/8560: 1 lock held by syz-executor231/8561: #0: 000000000e8b3ec3 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 000000000e8b3ec3 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1045 Comm: khungtaskd Not tainted 5.2.0-rc5-next-20190617 #16 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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:249 [inline] watchdog+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8560 Comm: syz-executor231 Not tainted 5.2.0-rc5-next-20190617 #16 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:lock_is_held_type+0x272/0x320 kernel/locking/lockdep.c:4458 Code: ff df c7 83 8c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 00 00 00 48 83 3d e6 69 7b 07 00 74 31 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 20 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d RSP: 0018:ffff88808ed4f840 EFLAGS: 00000282 RAX: 1ffffffff11a4f6e RBX: ffff888094f50580 RCX: ffff888094f50e10 RDX: dffffc0000000000 RSI: ffffffff88da3cc0 RDI: 0000000000000282 RBP: ffff88808ed4f888 R08: ffffffff81889d46 R09: ffffed1010f1629f R10: ffff88808ed4fa98 R11: ffff8880878b14f7 R12: 0000000000000000 R13: ffff888094f50e10 R14: ffffffff88da3cc0 R15: 0000000000000001 FS: 00007f098c683700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a4514000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:365 [inline] ___might_sleep+0x201/0x280 kernel/sched/core.c:6098 __might_sleep+0x95/0x190 kernel/sched/core.c:6086 __mutex_lock_common kernel/locking/mutex.c:909 [inline] __mutex_lock+0xc8/0x1310 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 perf_mmap+0x746/0x1800 kernel/events/core.c:5672 call_mmap include/linux/fs.h:1875 [inline] mmap_region+0xc35/0x1760 mm/mmap.c:1788 do_mmap+0x8e2/0x1080 mm/mmap.c:1561 do_mmap_pgoff include/linux/mm.h:2389 [inline] vm_mmap_pgoff+0x1c5/0x230 mm/util.c:438 ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1611 __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+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446949 Code: e8 5c b3 02 00 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 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f098c682da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446949 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020fff000 RBP: 00000000006dbc20 R08: 0000000000000003 R09: 0000000000000000 R10: 0002000000001011 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007ffe2001cddf R14: 00007f098c6839c0 R15: 20c49ba5e353f7cf