INFO: task syz-executor243:8860 blocked for more than 143 seconds. Not tainted 5.2.0-rc3+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor243 D24096 8860 8859 0x00000000 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 __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:1408 [inline] __do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1523 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1554 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156 RIP: 0033:0x4aebf0 Code: Bad RIP value. RSP: 002b:00007fffc96b6fd8 EFLAGS: 00010206 RAX: 00000000004aebf0 RBX: 0000000000000001 RCX: 00000000006e47b0 RDX: 0000000000409ec0 RSI: 0000000000000001 RDI: 00000000004d0510 RBP: 00007fffc96b6fe0 R08: 00007fffc96b74d9 R09: 00007fffc96b74d9 R10: 00007fffc96b7060 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000006e47a0 R14: 000000000000002d R15: 0000000000000007 Showing all locks held in the system: 1 lock held by khungtaskd/1043: #0: 0000000081bddb8c (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 1 lock held by rsyslogd/8723: #0: 00000000508deb1e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8835: #0: 000000003797730f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d9eae8ff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8836: #0: 000000006859be97 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000679200e4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8837: #0: 00000000ba8a62e4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000047ce23ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8838: #0: 0000000097efaad4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006b1d8d65 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8839: #0: 0000000006bf5b57 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d91d1547 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8840: #0: 00000000a215cbd7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000026b56cef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8841: #0: 0000000039b777ca (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f6be7a8f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor243/8860: #0: 00000000e5481b08 (&mm->mmap_sem#2){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1408 [inline] #0: 00000000e5481b08 (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1523 2 locks held by syz-executor243/8872: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1043 Comm: khungtaskd Not tainted 5.2.0-rc3+ #23 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:205 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:289 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: 8872 Comm: syz-executor243 Not tainted 5.2.0-rc3+ #23 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__mutex_trylock_or_owner kernel/locking/mutex.c:100 [inline] RIP: 0010:__mutex_trylock kernel/locking/mutex.c:126 [inline] RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:928 [inline] RIP: 0010:__mutex_lock+0x369/0x1310 kernel/locking/mutex.c:1073 Code: 00 4c 89 ef e8 c8 44 8d fa 4d 09 f4 48 89 d8 f0 4d 0f b1 65 00 48 39 c3 74 5e 48 89 c3 eb 99 41 0f b6 0c 24 48 89 d0 83 e0 07 <83> c0 03 38 c8 7c 08 84 c9 0f 85 f5 0b 00 00 8b 35 c2 d2 49 03 85 RSP: 0018:ffff88808bdc7910 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000004 RDX: ffffffff8a65ad40 RSI: 0000000000000008 RDI: ffffffff8187fab6 RBP: ffff88808bdc7a80 R08: 1ffff1101357e8e6 R09: ffffed101357e8e7 R10: ffffed101357e8e6 R11: ffff88809abf4737 R12: fffffbfff14cb5a8 R13: ffff88809abf4730 R14: ffff8880904ba240 R15: 0000000000000000 FS: 00007f1e313e0700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a3894000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 perf_mmap+0x746/0x17f0 kernel/events/core.c:5672 call_mmap include/linux/fs.h:1877 [inline] mmap_region+0xc35/0x1760 mm/mmap.c:1788 do_mmap+0x8e2/0x1080 mm/mmap.c:1561 do_mmap_pgoff include/linux/mm.h:2402 [inline] vm_mmap_pgoff+0x1c5/0x230 mm/util.c:363 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: 0033:0x448d29 Code: e8 7c 1a 03 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 7b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1e313dfcd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dfc48 RCX: 0000000000448d29 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020fff000 RBP: 00000000006dfc40 R08: 0000000000000003 R09: 0000000000000000 R10: 0002000000001011 R11: 0000000000000246 R12: 00000000006dfc4c R13: 00007fffc96b6fbf R14: 00007f1e313e09c0 R15: 0000000000000000