INFO: task syz-executor.1:7807 blocked for more than 143 seconds. Not tainted 5.2.0-rc3+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28128 7807 8853 0x00000004 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: 0033:0x400590 Code: 00 00 00 00 00 00 a2 00 00 00 4b 01 00 00 29 02 00 00 54 02 00 00 00 00 00 00 a1 01 00 00 f2 00 00 00 1d 02 00 00 ba 00 00 00 <12> 01 00 00 45 01 00 00 00 00 00 00 e2 00 00 00 ab 01 00 00 bb 01 RSP: 002b:0000000000a6fb90 EFLAGS: 00010206 RAX: 0000000000000063 RBX: 0000000000761470 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000063 RBP: fffffffffffffffe R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000a6fca0 R11: 0000000000000246 R12: 0000000000761478 R13: 00000000004c53b9 R14: 0000000000000000 R15: 000000000075bfcc INFO: task syz-executor.1:7809 blocked for more than 143 seconds. Not tainted 5.2.0-rc3+ #39 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26912 7809 8853 0x80004004 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 exit_mm kernel/exit.c:513 [inline] do_exit+0x443/0x2fa0 kernel/exit.c:864 do_group_exit+0x135/0x370 kernel/exit.c:981 get_signal+0x471/0x24b0 kernel/signal.c:2640 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: Bad RIP value. RSP: 002b:00007f58f7c47cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 0000000000a6fb4f R14: 00007f58f7c489c0 R15: 000000000075bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1043: #0: 00000000c2186280 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 1 lock held by rsyslogd/8720: #0: 00000000776616da (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8810: #0: 000000003af12fdb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000064240224 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8811: #0: 000000004d1974a4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000aa86e4e6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8812: #0: 000000003cdc0df3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005c5e6c5c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8813: #0: 00000000ac31dd0d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000bc48a240 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8814: #0: 00000000632600d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009355326a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8815: #0: 000000001d4fdb3c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b73de3b5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8816: #0: 000000002b0ff3b1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a6cb8c6e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/7807: #0: 00000000ab321b42 (&mm->mmap_sem#2){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1408 [inline] #0: 00000000ab321b42 (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x9e9/0xda0 arch/x86/mm/fault.c:1523 1 lock held by syz-executor.1/7809: #0: 00000000ab321b42 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 00000000ab321b42 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 1 lock held by syz-executor.1/7811: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1043 Comm: khungtaskd Not tainted 5.2.0-rc3+ #39 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: 7811 Comm: syz-executor.1 Not tainted 5.2.0-rc3+ #39 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kasan_check_read+0x0/0x20 mm/kasan/common.c:93 Code: ef e9 24 eb ff ff 48 8b 73 58 89 c2 48 c7 c7 90 04 62 88 f7 da e8 44 98 b1 ff e9 c4 f5 ff ff 90 90 90 90 90 90 90 90 90 90 90 <55> 89 f6 31 d2 48 89 e5 48 8b 4d 08 e8 af 23 00 00 5d c3 0f 1f 00 RSP: 0018:ffff88808730f360 EFLAGS: 00000246 RAX: 000000000000b5a4 RBX: ffff88812ffffcc8 RCX: ffffffff81953f6c RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88812ffffcc8 RBP: ffff88808730f370 R08: 1ffff11025ffff9b R09: ffffed1025ffff9c R10: ffffed1025ffff9b R11: ffff88812ffffcdf R12: ffff88812fffc000 R13: 000000000000b5a4 R14: dffffc0000000000 R15: ffff8880872f6000 FS: 00007f58f7c27700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009511b000 CR4: 00000000001426f0 Call Trace: too_many_isolated mm/compaction.c:753 [inline] isolate_migratepages_block+0x13e/0x2d10 mm/compaction.c:800 isolate_migratepages mm/compaction.c:1817 [inline] compact_zone+0x1409/0x3820 mm/compaction.c:2158 compact_zone_order+0x1af/0x2a0 mm/compaction.c:2308 try_to_compact_pages+0x268/0xaf0 mm/compaction.c:2360 __alloc_pages_direct_compact+0x154/0x460 mm/page_alloc.c:3830 __alloc_pages_slowpath+0x510/0x28f0 mm/page_alloc.c:4397 __alloc_pages_nodemask+0x600/0x8d0 mm/page_alloc.c:4677 __alloc_pages include/linux/gfp.h:473 [inline] __alloc_pages_node include/linux/gfp.h:486 [inline] alloc_pages_vma+0x39a/0x540 mm/mempolicy.c:2088 new_page+0x2d5/0x3d0 mm/mempolicy.c:1145 unmap_and_move mm/migrate.c:1180 [inline] migrate_pages+0x47f/0x2ae0 mm/migrate.c:1431 do_mbind mm/mempolicy.c:1256 [inline] kernel_mbind+0xaf1/0xd90 mm/mempolicy.c:1373 __do_sys_mbind mm/mempolicy.c:1380 [inline] __se_sys_mbind mm/mempolicy.c:1376 [inline] __x64_sys_mbind+0xe1/0x1a0 mm/mempolicy.c:1376 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f58f7c26c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000000c00000 RDI: 0000000020012000 RBP: 000000000075bfc0 R08: 0000000000000000 R09: 0000010000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f58f7c276d4 R13: 00000000004c52a0 R14: 00000000004d92c8 R15: 00000000ffffffff