syzbot


INFO: task hung in ctrl_getfamily

Status: fixed on 2020/11/16 12:12
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+36edb5cac286af8e3385@syzkaller.appspotmail.com
Fix commit: 47733f9daf4f tipc: fix uninit skb->data in tipc_nl_compat_dumpit()
First crash: 2014d, last: 1400d
Cause bisection: introduced by (bisect log) :
commit 928df1880e24bcd47d6359ff86df24db3dfba3c3
Author: Jon Maloy <jon.maloy@ericsson.com>
Date: Thu Mar 15 15:48:51 2018 +0000

  tipc: obsolete TIPC_ZONE_SCOPE

Crash: INFO: task hung in ctrl_getfamily (log)
Repro: syz .config
  
Fix bisection: fixed by (bisect log) :
commit 47733f9daf4fe4f7e0eb9e273f21ad3a19130487
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Sat Aug 15 23:29:15 2020 +0000

  tipc: fix uninit skb->data in tipc_nl_compat_dumpit()

  
Discussions (2)
Title Replies (including bot) Last reply
INFO: task hung in ctrl_getfamily 2 (5) 2020/11/11 13:56
Reminder: 14 open syzbot bugs in "net/tipc" subsystem 1 (1) 2019/07/24 01:46
Fix bisection attempts (9)
Created Duration User Patch Repo Result
2020/09/14 05:48 4h54m bisect fix upstream job log (1)
2020/08/15 05:24 23m bisect fix upstream job log (0) log
2020/05/21 14:24 25m bisect fix upstream job log (0) log
2020/04/21 13:59 24m bisect fix upstream job log (0) log
2020/03/22 13:30 28m bisect fix upstream job log (0) log
2020/01/28 01:30 26m bisect fix upstream job log (0) log
2019/12/18 22:48 27m bisect fix upstream job log (0) log
2019/11/09 21:33 26m bisect fix upstream job log (0) log
2019/08/19 23:00 26m bisect fix upstream job log (0) log

Sample crash report:
audit: type=1400 audit(1544516891.178:42): avc:  denied  { read } for  pid=6541 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
INFO: task syz-executor0:6586 blocked for more than 140 seconds.
      Not tainted 4.20.0-rc6+ #151
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D23328  6586   6281 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xaff/0x16f0 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 genl_lock net/netlink/genetlink.c:33 [inline]
 ctrl_getfamily+0x313/0x420 net/netlink/genetlink.c:873
 genl_family_rcv_msg+0x8a7/0x11a0 net/netlink/genetlink.c:601
 genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:631
 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
 __sys_sendmsg+0x11d/0x280 net/socket.c:2154
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg net/socket.c:2161 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411231
Code: 01 4c 89 54 24 28 e9 6f fa ff ff 49 8b 7c 24 70 8b 35 43 c4 24 00 ff 15 ed 83 24 00 85 c0 0f 85 b3 fe ff ff 49 8b 7c 24 70 be <20> 13 41 00 ff 15 dd 83 24 00 85 c0 0f 85 9b fe ff ff 49 8b 7c 24
RSP: 002b:00007fedfae5a9c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000411231
RDX: 0000000000000000 RSI: 00007fedfae5aa00 RDI: 0000000000000008
RBP: 0000000000000008 R08: 00007fedfae5a9d0 R09: 000000000072bfa0
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fedfae5aa40
R13: 00000000004cc498 R14: 00000000004d9968 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1019:
 #0: 0000000037177328 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379
1 lock held by rsyslogd/6114:
 #0: 00000000c7cdec10 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/6236:
 #0: 00000000ee8013ef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000035b00336 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/6237:
 #0: 00000000b8177c84 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000003a3d1b2b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/6238:
 #0: 000000000c22e0c1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000ab4fd834 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/6239:
 #0: 000000008e0adb33 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000a9397083 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/6240:
 #0: 00000000df8ef64e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000e6608498 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/6241:
 #0: 000000003c07cf12 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000063f4d993 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by getty/6242:
 #0: 00000000260a9821 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000004fece6cf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
2 locks held by syz-executor0/6584:
2 locks held by syz-executor0/6586:
 #0: 000000008f85a4a3 (cb_lock){++++}, at: ctrl_getfamily+0x305/0x420 net/netlink/genetlink.c:872
 #1: 0000000091d95376 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline]
 #1: 0000000091d95376 (genl_mutex){+.+.}, at: ctrl_getfamily+0x313/0x420 net/netlink/genetlink.c:873

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

NMI backtrace for cpu 0
CPU: 0 PID: 1019 Comm: khungtaskd Not tainted 4.20.0-rc6+ #151
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+0x244/0x39d lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0xb51/0x1060 kernel/hung_task.c:289
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6584 Comm: syz-executor0 Not tainted 4.20.0-rc6+ #151
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.202 msecs
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x9fc/0x4c20 kernel/locking/lockdep.c:3218
Code: 48 33 0c 25 28 00 00 00 0f 85 3e 2b 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea <48> c1 ea 03 80 3c 02 00 0f 85 aa 2c 00 00 49 81 7d 00 a0 52 54 8a
RSP: 0018:ffff8881bc7c6400 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffffffff8959bf40 RSI: 0000000000000000 RDI: ffffffff8959bf40
RBP: ffff8881bc7c6790 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8881bc4be640 R12: ffff8881bc4be640
R13: ffffffff8959bf40 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fedfae7c700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001bff64000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
 rcu_lock_acquire include/linux/rcupdate.h:223 [inline]
 rcu_read_lock include/linux/rcupdate.h:607 [inline]
 rhashtable_lookup_fast include/linux/rhashtable.h:541 [inline]
 tipc_sk_lookup+0x33a/0xff0 net/tipc/socket.c:2746
 tipc_nl_publ_dump+0x22d/0xf93 net/tipc/socket.c:3550
 __tipc_nl_compat_dumpit.isra.11+0x25d/0xb60 net/tipc/netlink_compat.c:196
 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:925 [inline]
 tipc_nl_compat_sk_dump+0x88e/0xc50 net/tipc/netlink_compat.c:973
 __tipc_nl_compat_dumpit.isra.11+0x389/0xb60 net/tipc/netlink_compat.c:205
 tipc_nl_compat_dumpit+0x1f4/0x440 net/tipc/netlink_compat.c:270
 tipc_nl_compat_handle net/tipc/netlink_compat.c:1147 [inline]
 tipc_nl_compat_recv+0x12b3/0x19a0 net/tipc/netlink_compat.c:1210
 genl_family_rcv_msg+0x8a7/0x11a0 net/netlink/genetlink.c:601
 genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:631
 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
 __sys_sendmsg+0x11d/0x280 net/socket.c:2154
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg net/socket.c:2161 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457659
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fedfae7bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457659
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fedfae7c6d4
R13: 00000000004c4171 R14: 00000000004d7058 R15: 00000000ffffffff

Crashes (22):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/12/11 08:41 upstream f5d582777bcb 4093e33b .config console log report syz ci-upstream-kasan-gce-selinux-root
2018/12/11 07:35 upstream f5d582777bcb 4093e33b .config console log report syz ci-upstream-kasan-gce-root
2018/12/11 04:54 upstream f5d582777bcb 4093e33b .config console log report syz ci-upstream-kasan-gce
2018/12/10 21:42 upstream 40e020c129cf 6565f24d .config console log report syz ci-upstream-kasan-gce-root
2018/12/11 07:11 upstream f5d582777bcb 4093e33b .config console log report syz ci-upstream-kasan-gce-386
2018/12/10 21:13 upstream 40e020c129cf 6565f24d .config console log report syz ci-upstream-kasan-gce-386
2018/12/17 10:37 upstream 7566ec393f41 def91db3 .config console log report ci-upstream-kasan-gce
2019/06/10 22:56 net-old dce5ccccd123 0159583c .config console log report ci-upstream-net-this-kasan-gce
2019/06/07 23:09 net-old 720f1de4021f ce9107d0 .config console log report ci-upstream-net-this-kasan-gce
2019/03/24 02:22 net-old c8248c6c1a3d a2cef203 .config console log report ci-upstream-net-this-kasan-gce
2019/02/05 19:19 net-old c8101f7729da d672172c .config console log report ci-upstream-net-this-kasan-gce
2019/02/02 08:26 net-old ba59fb027307 564f9a4f .config console log report ci-upstream-net-this-kasan-gce
2019/01/22 00:02 net-old 49a57857aeea badbbeee .config console log report ci-upstream-net-this-kasan-gce
2019/09/27 15:08 net-next-old b41dae061bbd d8074e0b .config console log report ci-upstream-net-kasan-gce
2019/08/25 16:12 net-next-old c1236979b4d2 d21c5d9d .config console log report ci-upstream-net-kasan-gce
2019/05/02 10:17 net-next-old cd86972a9fd0 7516d9fa .config console log report ci-upstream-net-kasan-gce
2019/04/09 19:35 net-next-old 7f301cff1fc2 995065ff .config console log report ci-upstream-net-kasan-gce
2019/04/05 20:43 net-next-old 8f4043f12532 40f2363e .config console log report ci-upstream-net-kasan-gce
2019/03/31 13:49 net-next-old 35f861e3c58e 0c624d4d .config console log report ci-upstream-net-kasan-gce
2019/03/02 16:42 net-next-old 9bfc445e0eec 1c0e457a .config console log report ci-upstream-net-kasan-gce
2019/02/18 09:13 net-next-old e511f17b1fb4 59f36113 .config console log report ci-upstream-net-kasan-gce
2019/01/30 23:26 net-next-old 08c25fe83a0c aa432daf .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.