syzbot


INFO: task hung in get_info (2)

Status: auto-closed as invalid on 2019/11/25 07:20
Reported-by: syzbot+89cf3aa8c7837bf2c968@syzkaller.appspotmail.com
First crash: 1728d, last: 1728d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: task hung in get_info 2 1534d 1538d 0/1 auto-closed as invalid on 2020/06/06 08:06
android-49 INFO: task hung in get_info 1 2048d 2048d 0/3 auto-closed as invalid on 2019/03/10 04:11
linux-4.19 INFO: task hung in get_info C error 13 1124d 1185d 0/1 upstream: reported C repro on 2021/01/21 06:12
android-414 INFO: task hung in get_info 14 1628d 1833d 0/1 auto-closed as invalid on 2020/03/04 07:49
upstream INFO: task hung in get_info (3) netfilter 5 1149d 1195d 0/26 auto-closed as invalid on 2021/05/27 19:05
upstream INFO: task hung in get_info (4) netfilter 4 828d 852d 0/26 closed as invalid on 2022/02/08 09:50
upstream INFO: task hung in get_info (2) netfilter 2 1708d 1711d 0/26 auto-closed as invalid on 2019/11/15 17:14
android-44 INFO: task hung in get_info 3 1652d 1803d 0/2 auto-closed as invalid on 2020/02/09 04:02
upstream INFO: task hung in get_info netfilter 8 2240d 2238d 0/26 auto-closed as invalid on 2019/02/22 10:34

Sample crash report:
   Free memory is -13444kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (31883) (tgid 31881), adj 1000,
   to free 51404kB on behalf of 'syz-fuzzer' (2044) because
   cache 424kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13444kB above reserved
INFO: task syz-executor.5:2088 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D24648  2088   2082 0x00000000
 ffff8801d114df00 0000000000000000 ffff8801cf741b80 ffff8801d9942f80
 ffff8801db621018 ffff8801b30cf7d8 ffffffff828075c2 0000000000000000
 ffff8801d114e7b0 ffffed003a229cf5 00ff8801d114df00 ffff8801db6218f0
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
 [<ffffffff8244fa1c>] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1027
 [<ffffffff8261a90d>] get_info+0x13d/0x510 net/ipv6/netfilter/ip6_tables.c:1012
 [<ffffffff8261c36b>] do_arpt_get_ctl+0x38b/0x860 net/ipv4/netfilter/arp_tables.c:1492
 [<ffffffff823e2840>] nf_sockopt net/netfilter/nf_sockopt.c:103 [inline]
 [<ffffffff823e2840>] nf_getsockopt+0x70/0xd0 net/netfilter/nf_sockopt.c:121
 [<ffffffff824bd877>] ip_getsockopt+0x127/0x170 net/ipv4/ip_sockglue.c:1557
 [<ffffffff824e0228>] tcp_getsockopt+0x88/0xe0 net/ipv4/tcp.c:3106
 [<ffffffff822a706a>] sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2665
 [<ffffffff822a4fc0>] SYSC_getsockopt net/socket.c:1816 [inline]
 [<ffffffff822a4fc0>] SyS_getsockopt+0x150/0x240 net/socket.c:1798
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1891:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc7c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2018:
 #0:  (&tty->ldisc_sem){++++++}, 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.5/2088:
 #0:  (&xt[i].mutex){+.+.+.}, at: [<ffffffff8244fa1c>] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1027
3 locks held by kworker/1:5/6287:
 #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
3 locks held by kworker/u4:31/15694:
 #0:  ("%s""netns"){.+.+.+}, at: [<ffffffff81130f0c>] process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
 #1:  (net_cleanup_work){+.+.+.}, at: [<ffffffff81130f44>] process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
 #2:  (net_mutex){+.+.+.}, at: [<ffffffff822e681f>] cleanup_net+0x13f/0x8b0 net/core/net_namespace.c:439
1 lock held by syz-executor.0/21354:
 #0:  (&xt[i].mutex){+.+.+.}, at: [<ffffffff8244fa1c>] xt_find_table_lock+0x3c/0x3d0 net/netfilter/x_tables.c:1027
2 locks held by syz-executor.2/23093:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&tty->atomic_write_lock){+.+.+.}, at: [<ffffffff81d1f7e1>] tty_write_lock+0x21/0x60 drivers/tty/tty_io.c:1107
1 lock held by syz-executor.3/31883:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff822e70e5>] copy_net_ns+0x155/0x330 net/core/net_namespace.c:406

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #1
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000002
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: 31916 Comm: syz-executor.1 Not tainted 4.9.141+ #1
task: ffff8801d9fe8000 task.stack: ffff88010b150000
RIP: 0010:[<ffffffff8120c91d>] c [<ffffffff8120c91d>] lock_acquire+0x17d/0x3e0 kernel/locking/lockdep.c:3760
RSP: 0018:ffff88010b1572f0  EFLAGS: 00000286
RAX: 0000000000000007 RBX: ffff8801976a07c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801d9fe8950 RDI: 0000000000000246
RBP: ffff88010b157310 R08: ffff8801d9fe8970 R09: 069fa0192f184961
R10: ffff8801d9fe8000 R11: 0000000000000001 R12: ffff8801d9fe8000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fc669a95700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76dc47afda CR3: 000000017b006000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffff8801976a0000c dffffc0000000000c ffff8801976a07c0c ffff8801976a0738c
 ffff88010b157330c ffffffff82816c26c ffffffff8141a061c ffff8801976a0000c
 ffff88010b157378c ffffffff8141a061c ffffffff81419f70c ffffed0032ed40e7c
Call Trace:
 [<ffffffff82816c26>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff82816c26>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff8141a061>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff8141a061>] task_lock include/linux/sched.h:3257 [inline]
 [<ffffffff8141a061>] find_lock_task_mm+0xf1/0x270 mm/oom_kill.c:115
 [<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
 [<ffffffff814c9e8b>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff814c9e8b>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff814c9e8b>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff814c9e8b>] __vmalloc_area_node mm/vmalloc.c:1644 [inline]
 [<ffffffff814c9e8b>] __vmalloc_node_range+0x25b/0x600 mm/vmalloc.c:1702
 [<ffffffff814ca63b>] __vmalloc_node mm/vmalloc.c:1745 [inline]
 [<ffffffff814ca63b>] __vmalloc_node_flags mm/vmalloc.c:1759 [inline]
 [<ffffffff814ca63b>] vzalloc+0x5b/0x70 mm/vmalloc.c:1791
 [<ffffffff827cfbce>] alloc_one_pg_vec_page net/packet/af_packet.c:4208 [inline]
 [<ffffffff827cfbce>] alloc_pg_vec net/packet/af_packet.c:4233 [inline]
 [<ffffffff827cfbce>] packet_set_ring+0x51e/0x1810 net/packet/af_packet.c:4323
 [<ffffffff827d29d3>] packet_setsockopt+0xfa3/0x2630 net/packet/af_packet.c:3685
 [<ffffffff822a4d76>] SYSC_setsockopt net/socket.c:1785 [inline]
 [<ffffffff822a4d76>] SyS_setsockopt+0x166/0x260 net/socket.c:1764
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: c07 c83 cc0 c03 c38 cd0 c7c c08 c84 cd2 c0f c85 cc8 c01 c00 c00 c41 cc7 c84 c24 cac c08 c00 c00 c00 c00 c00 c00 c48 c89 cdf c57 c9d c0f c1f c44 c00 c00 c48 c83 cc4 c40 c5b c<41> c5c c41 c5d c41 c5e c41 c5f c5d cc3 c4c c89 c5d cc8 c65 cff c05 c5e cb4 ce0 c7e c

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/07/28 07:20 https://android.googlesource.com/kernel/common android-4.9 8fe428403e30 c85e1c5b .config console log report ci-android-49-kasan-gce
* Struck through repros no longer work on HEAD.