Free memory is -13452kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (32444) (tgid 32439), adj 1000,
   to free 39712kB on behalf of 'syz-fuzzer' (2066) because
   cache 204kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13452kB above reserved
INFO: task kworker/1:3:26369 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #23
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:3     D27240 26369      2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
 ffff8801cb5c0000 0000000000000000 ffff8801d0cb3180 ffff8801da6797c0
 ffff8801db721018 ffff88009b3bfae8 ffffffff828075c2 0000000000000002
 ffff8801cb5c08b0 ffff8800bb2d87f8 00ff8801cb5c0000 ffff8801db7218f0
Call Trace:
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff828094a3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280b51d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280b51d>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff823412d7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
lowmemorykiller: Killing 'syz-executor.3' (32444) (tgid 32439), adj 1000,
   to free 39712kB on behalf of 'rsyslogd' (1912) because
   cache 336kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13300kB above reserved
 [<ffffffff826c31be>] addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4364
 [<ffffffff81131001>] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092
 [<ffffffff81131e96>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] rcu_read_unlock include/linux/rcupdate.h:927 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] rcu_lock_break kernel/hung_task.c:143 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] check_hung_uninterruptible_tasks kernel/hung_task.c:177 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] watchdog+0x310/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2041:
 #0:  (&tty->ldisc_sem){++++++}[ 3154.947959] lowmemorykiller: Killing 'syz-executor.3' (32444) (tgid 32439), adj 1000,
   to free 39712kB on behalf of 'rs:main Q:Reg' (1910) because
   cache 380kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13324kB above reserved
, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor.1/29926:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81520d73>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1369
3 locks held by kworker/1:3/26369:
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff81130f0c>] process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
 #1:  ((addr_chk_work).work){+.+...}, at: [<ffffffff81130f44>] process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
 #2:  (rtnl_mutex){+.+.+.}, at: [<ffffffff823412d7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70

=============================================

lowmemorykiller: Killing 'syz-executor.3' (32444) (tgid 32439), adj 1000,
   to free 39712kB on behalf of 'getty' (32503) because
   cache 320kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13328kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (32444) (tgid 32439), adj 1000,
   to free 39712kB on behalf of 'getty' (32505) because
   cache 320kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13328kB above reserved
NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #23
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2067 Comm: syz-fuzzer Not tainted 4.9.141+ #23
task: ffff8801d2442f80 task.stack: ffff8801ce7d0000
RIP: 0010:[<ffffffff8141a082>] 
c [<ffffffff8141a082>] find_lock_task_mm+0x112/0x270 mm/oom_kill.c:116
RSP: 0000:ffff8801ce7d7490  EFLAGS: 00000286
RAX: 1ffff100176bfc6d RBX: ffff8800bb5fdf00 RCX: 0000000000000000
RDX: 1ffff100176bfcda RSI: ffff8801d24438f8 RDI: ffff8800bb5fe368
RBP: ffff8801ce7d74c8 R08: ffff8801d2443918 R09: 5b0fdfab4dd035d8
R10: ffff8801d2442f80 R11: 0000000000000001 R12: ffff8800bb5fdf00
R13: dffffc0000000000 R14: ffff8800bb5fe6c0 R15: ffff8800bb5fe638
FS:  000000c4200263e8(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdd42451a30 CR3: 00000001ce219000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81419f70
c ffffed00176bfcc7
c ffff8800bb5fdf00
c dffffc0000000000
c
 ffff8800bb5fe318
c ffff880184415f00
c 0000000000000600
c ffff8801ce7d7578
c
 ffffffff821effdf
c ffffffff821efede
c ffff8801ce7d7520
c ffffffff81ba7d7b
c
Call Trace:
 [<ffffffff821effdf>] lowmem_scan+0x34f/0xaf0 drivers/staging/android/lowmemorykiller.c:134
 [<ffffffff81449cc6>] do_shrink_slab mm/vmscan.c:398 [inline]
 [<ffffffff81449cc6>] shrink_slab.part.8+0x3c6/0xa00 mm/vmscan.c:501
 [<ffffffff814557fd>] shrink_slab mm/vmscan.c:465 [inline]
 [<ffffffff814557fd>] shrink_node+0x1ed/0x740 mm/vmscan.c:2602
 [<ffffffff814560c7>] shrink_zones mm/vmscan.c:2749 [inline]
 [<ffffffff814560c7>] do_try_to_free_pages mm/vmscan.c:2791 [inline]
 [<ffffffff814560c7>] try_to_free_pages+0x377/0xb80 mm/vmscan.c:3002
 [<ffffffff81428a01>] __perform_reclaim mm/page_alloc.c:3324 [inline]
 [<ffffffff81428a01>] __alloc_pages_direct_reclaim mm/page_alloc.c:3345 [inline]
 [<ffffffff81428a01>] __alloc_pages_slowpath mm/page_alloc.c:3697 [inline]
 [<ffffffff81428a01>] __alloc_pages_nodemask+0x981/0x1bd0 mm/page_alloc.c:3862
 [<ffffffff81415701>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff81415701>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff81415701>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff81415701>] __page_cache_alloc include/linux/pagemap.h:208 [inline]
 [<ffffffff81415701>] page_cache_read mm/filemap.c:2007 [inline]
 [<ffffffff81415701>] filemap_fault+0xaf1/0x1110 mm/filemap.c:2192
 [<ffffffff816e7721>] ext4_filemap_fault+0x71/0xa0 fs/ext4/inode.c:5853
 [<ffffffff81492ef3>] __do_fault+0x223/0x500 mm/memory.c:2833
 [<ffffffff814a3696>] do_read_fault mm/memory.c:3180 [inline]
 [<ffffffff814a3696>] do_fault mm/memory.c:3315 [inline]
 [<ffffffff814a3696>] handle_pte_fault mm/memory.c:3516 [inline]
 [<ffffffff814a3696>] __handle_mm_fault mm/memory.c:3603 [inline]
 [<ffffffff814a3696>] handle_mm_fault+0x1326/0x2350 mm/memory.c:3640
 [<ffffffff810b2b33>] __do_page_fault+0x403/0xa60 arch/x86/mm/fault.c:1406
 [<ffffffff810b31e7>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff828188b5>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951
Code: 
c00 
c00 
c4c 
c89 
cf7 
ce8 
c8f 
ccb 
c3f 
c01 
c48 
c8d 
cbb 
c68 
c04 
c00 
c00 
c48 
c89 
cf8 
c48 
cc1 
ce8 
c03 
c42 
c80 
c3c 
c28 
c00 
c0f 
c85 
c41 
c01 
c00 
c00 
c48 
c83 
cbb 
c68 
c04 
c00 
c00 
c00 
c<0f> 
c84 
cc4 
c00 
c00 
c00 
ce8 
cd3 
c19 
cf0 
cff 
ce8 
c7e 
c9b 
ce2 
cff 
c85 
cc0 
c74 
c0e 
ce8 
c