* Re: possible deadlock in __synchronize_srcu
[not found] <001a114a6b20cafb9c055cd73f86@google.com>
@ 2017-10-31 13:20 ` Dmitry Vyukov
2017-10-31 14:54 ` Vlastimil Babka
0 siblings, 1 reply; 3+ messages in thread
From: Dmitry Vyukov @ 2017-10-31 13:20 UTC (permalink / raw)
To: syzbot
Cc: Andrew Morton, Christoph Lameter, Joonsoo Kim, LKML, linux-mm,
Pekka Enberg, David Rientjes, syzkaller-bugs, kasan-dev
On Tue, Oct 31, 2017 at 3:54 PM, syzbot
<bot+b8ff4d5c3fa77f2e2f0f9be34e6b2795ffc3c65e@syzkaller.appspotmail.com>
wrote:
> Hello,
>
> syzkaller hit the following crash on
> 9506597de2cde02d48c11d5c250250b9143f59f7
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
Another reincarnation of:
https://groups.google.com/d/msg/syzkaller-bugs/PCeHYAmw-TQ/TKMoo6xhAgAJ
#syz dup: possible deadlock in process_one_work
> ======================================================
> WARNING: possible circular locking dependency detected
> 4.13.0-rc6-next-20170824+ #8 Not tainted
> ------------------------------------------------------
> kworker/u4:2/57 is trying to acquire lock:
> ((complete)&rcu.completion){+.+.}, at: [<ffffffff815afff5>]
> __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898
>
> but task is already holding lock:
> (slab_mutex){+.+.}, at: [<ffffffff8192b730>] kmem_cache_destroy+0x30/0x250
> mm/slab_common.c:821
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #3 (slab_mutex){+.+.}:
> check_prevs_add kernel/locking/lockdep.c:2020 [inline]
> validate_chain kernel/locking/lockdep.c:2469 [inline]
> __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498
> lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
> __mutex_lock_common kernel/locking/mutex.c:756 [inline]
> __mutex_lock+0x16f/0x1870 kernel/locking/mutex.c:893
> mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
> kmem_cache_create+0x39/0x2a0 mm/slab_common.c:435
> ptlock_cache_init+0x24/0x2d mm/memory.c:4632
> pgtable_init include/linux/mm.h:1756 [inline]
> mm_init init/main.c:504 [inline]
> start_kernel+0x3d4/0x7ad init/main.c:569
> x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:381
> x86_64_start_kernel+0x13c/0x149 arch/x86/kernel/head64.c:362
> verify_cpu+0x0/0xfb
>
> -> #2 (memcg_cache_ids_sem){.+.+}:
> check_prevs_add kernel/locking/lockdep.c:2020 [inline]
> validate_chain kernel/locking/lockdep.c:2469 [inline]
> __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498
> lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
> down_read+0x96/0x150 kernel/locking/rwsem.c:23
> memcg_get_cache_ids+0x10/0x20 mm/memcontrol.c:274
> list_lru_destroy+0x96/0x490 mm/list_lru.c:573
> deactivate_locked_super+0x94/0xd0 fs/super.c:315
> deactivate_super+0x141/0x1b0 fs/super.c:339
> cleanup_mnt+0xb2/0x150 fs/namespace.c:1113
> mntput_no_expire+0x6e0/0xa90 fs/namespace.c:1179
> mntput fs/namespace.c:1189 [inline]
> kern_unmount+0x9c/0xd0 fs/namespace.c:2934
> pid_ns_release_proc+0x37/0x50 fs/proc/root.c:231
> proc_cleanup_work+0x19/0x20 kernel/pid_namespace.c:79
> process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098
> worker_thread+0x223/0x1860 kernel/workqueue.c:2233
> kthread+0x39c/0x470 kernel/kthread.c:231
> ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
>
> -> #1 ((&ns->proc_work)){+.+.}:
> process_one_work+0xba5/0x1be0 kernel/workqueue.c:2095
> worker_thread+0x223/0x1860 kernel/workqueue.c:2233
> kthread+0x39c/0x470 kernel/kthread.c:231
> ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
> 0xffffffffffffffff
>
> -> #0 ((complete)&rcu.completion){+.+.}:
> check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894
> check_prevs_add kernel/locking/lockdep.c:2020 [inline]
> validate_chain kernel/locking/lockdep.c:2469 [inline]
> __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498
> lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
> complete_acquire include/linux/completion.h:39 [inline]
> __wait_for_common kernel/sched/completion.c:108 [inline]
> wait_for_common kernel/sched/completion.c:122 [inline]
> wait_for_completion+0xc8/0x770 kernel/sched/completion.c:143
> __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898
> synchronize_srcu_expedited kernel/rcu/srcutree.c:923 [inline]
> synchronize_srcu+0x1a3/0x560 kernel/rcu/srcutree.c:974
> quarantine_remove_cache+0xd7/0xf0 mm/kasan/quarantine.c:327
> kasan_cache_shutdown+0x9/0x10 mm/kasan/kasan.c:381
> shutdown_cache+0x15/0x1b0 mm/slab_common.c:531
> kmem_cache_destroy+0x236/0x250 mm/slab_common.c:829
> tipc_server_stop+0x13f/0x190 net/tipc/server.c:636
> tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390
> tipc_exit_net+0x15/0x40 net/tipc/core.c:96
> ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
> cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483
> process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098
> worker_thread+0x223/0x1860 kernel/workqueue.c:2233
> kthread+0x39c/0x470 kernel/kthread.c:231
> ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
>
> other info that might help us debug this:
>
> Chain exists of:
> (complete)&rcu.completion --> memcg_cache_ids_sem --> slab_mutex
>
> Possible unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(slab_mutex);
> lock(memcg_cache_ids_sem);
> lock(slab_mutex);
> lock((complete)&rcu.completion);
>
> *** DEADLOCK ***
>
> 5 locks held by kworker/u4:2/57:
> #0: ("%s""netns"){.+.+}, at: [<ffffffff81464534>] __write_once_size
> include/linux/compiler.h:305 [inline]
> #0: ("%s""netns"){.+.+}, at: [<ffffffff81464534>] atomic64_set
> arch/x86/include/asm/atomic64_64.h:33 [inline]
> #0: ("%s""netns"){.+.+}, at: [<ffffffff81464534>] atomic_long_set
> include/asm-generic/atomic-long.h:56 [inline]
> #0: ("%s""netns"){.+.+}, at: [<ffffffff81464534>] set_work_data
> kernel/workqueue.c:617 [inline]
> #0: ("%s""netns"){.+.+}, at: [<ffffffff81464534>]
> set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
> #0: ("%s""netns"){.+.+}, at: [<ffffffff81464534>]
> process_one_work+0xad4/0x1be0 kernel/workqueue.c:2090
> #1: (net_cleanup_work){+.+.}, at: [<ffffffff8146458c>]
> process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094
> #2: (net_mutex){+.+.}, at: [<ffffffff83e50bc7>] cleanup_net+0x247/0xb60
> net/core/net_namespace.c:449
> #3: (cpu_hotplug_lock.rw_sem){++++}, at: [<ffffffff8192b722>]
> get_online_cpus include/linux/cpu.h:126 [inline]
> #3: (cpu_hotplug_lock.rw_sem){++++}, at: [<ffffffff8192b722>]
> kmem_cache_destroy+0x22/0x250 mm/slab_common.c:818
> #4: (slab_mutex){+.+.}, at: [<ffffffff8192b730>]
> kmem_cache_destroy+0x30/0x250 mm/slab_common.c:821
>
> stack backtrace:
> CPU: 1 PID: 57 Comm: kworker/u4:2 Not tainted 4.13.0-rc6-next-20170824+ #8
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: netns cleanup_net
> Call Trace:
> __dump_stack lib/dump_stack.c:16 [inline]
> dump_stack+0x194/0x257 lib/dump_stack.c:52
> print_circular_bug+0x503/0x710 kernel/locking/lockdep.c:1259
> check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894
> check_prevs_add kernel/locking/lockdep.c:2020 [inline]
> validate_chain kernel/locking/lockdep.c:2469 [inline]
> __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498
> lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002
> complete_acquire include/linux/completion.h:39 [inline]
> __wait_for_common kernel/sched/completion.c:108 [inline]
> wait_for_common kernel/sched/completion.c:122 [inline]
> wait_for_completion+0xc8/0x770 kernel/sched/completion.c:143
> __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898
> synchronize_srcu_expedited kernel/rcu/srcutree.c:923 [inline]
> synchronize_srcu+0x1a3/0x560 kernel/rcu/srcutree.c:974
> quarantine_remove_cache+0xd7/0xf0 mm/kasan/quarantine.c:327
> kasan_cache_shutdown+0x9/0x10 mm/kasan/kasan.c:381
> shutdown_cache+0x15/0x1b0 mm/slab_common.c:531
> kmem_cache_destroy+0x236/0x250 mm/slab_common.c:829
> tipc_server_stop+0x13f/0x190 net/tipc/server.c:636
> tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390
> tipc_exit_net+0x15/0x40 net/tipc/core.c:96
> ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
> cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483
> process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098
> worker_thread+0x223/0x1860 kernel/workqueue.c:2233
> kthread+0x39c/0x470 kernel/kthread.c:231
> ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
> QAT: Invalid ioctl
> QAT: Invalid ioctl
> QAT: Invalid ioctl
> QAT: Invalid ioctl
> TCP: request_sock_TCP: Possible SYN flooding on port 20012. Sending cookies.
> Check SNMP counters.
> sctp: [Deprecated]: syz-executor6 (pid 4597) Use of int in max_burst socket
> option deprecated.
> Use struct sctp_assoc_value instead
> audit: type=1326 audit(1503608734.272:8): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=4680 comm="syz-executor3"
> exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> audit: type=1326 audit(1503608734.367:9): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=4680 comm="syz-executor3"
> exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> sctp: [Deprecated]: syz-executor3 (pid 4928) Use of int in max_burst socket
> option.
> Use struct sctp_assoc_value instead
> sctp: [Deprecated]: syz-executor3 (pid 4928) Use of int in max_burst socket
> option.
> Use struct sctp_assoc_value instead
> TCP: request_sock_TCP: Possible SYN flooding on port 20020. Sending cookies.
> Check SNMP counters.
> mmap: syz-executor7 (5066): VmData 1892352 exceed data ulimit 1. Update
> limits or use boot option ignore_rlimit_data.
> nla_parse: 7 callbacks suppressed
> netlink: 5 bytes leftover after parsing attributes in process
> `syz-executor7'.
> IPv6: NLM_F_REPLACE set, but no existing node found!
> netlink: 5 bytes leftover after parsing attributes in process
> `syz-executor7'.
> ptm ptm1: ldisc open failed (-12), clearing slot 1
> IPv6: NLM_F_REPLACE set, but no existing node found!
> netlink: 3 bytes leftover after parsing attributes in process
> `syz-executor6'.
> netlink: 3 bytes leftover after parsing attributes in process
> `syz-executor6'.
> netlink: 3 bytes leftover after parsing attributes in process
> `syz-executor6'.
> device lo entered promiscuous mode
> netlink: 3 bytes leftover after parsing attributes in process
> `syz-executor6'.
> netlink: 3 bytes leftover after parsing attributes in process
> `syz-executor6'.
> netlink: 3 bytes leftover after parsing attributes in process
> `syz-executor6'.
> device lo entered promiscuous mode
> dccp_invalid_packet: invalid packet type
> dccp_invalid_packet: invalid packet type
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535
> sclass=netlink_route_socket pig=5222 comm=syz-executor3
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535
> sclass=netlink_route_socket pig=5222 comm=syz-executor3
> pit: kvm: requested 2514 ns i8254 timer period limited to 500000 ns
> pit: kvm: requested 2514 ns i8254 timer period limited to 500000 ns
> netlink: 8 bytes leftover after parsing attributes in process
> `syz-executor5'.
> netlink: 5 bytes leftover after parsing attributes in process
> `syz-executor5'.
> SELinux: unrecognized netlink message: protocol=6 nlmsg_type=3131
> sclass=netlink_xfrm_socket pig=5545 comm=syz-executor4
> SELinux: unrecognized netlink message: protocol=6 nlmsg_type=3131
> sclass=netlink_xfrm_socket pig=5545 comm=syz-executor4
> sctp: [Deprecated]: syz-executor3 (pid 5561) Use of struct sctp_assoc_value
> in delayed_ack socket option.
> Use struct sctp_sack_info instead
> sctp: [Deprecated]: syz-executor3 (pid 5561) Use of struct sctp_assoc_value
> in delayed_ack socket option.
> Use struct sctp_sack_info instead
> audit: type=1326 audit(1503608738.163:10): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=5622 comm="syz-executor5"
> exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> capability: warning: `syz-executor0' uses deprecated v2 capabilities in a
> way that may be insecure
> audit: type=1326 audit(1503608738.292:11): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=5622 comm="syz-executor5"
> exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025
> sclass=netlink_route_socket pig=5659 comm=syz-executor1
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025
> sclass=netlink_route_socket pig=5684 comm=syz-executor1
> Assertion failed! net/irda/ircomm/ircomm_core.c:ircomm_flow_request:475 self
> != NULL
> QAT: Invalid ioctl
> QAT: Invalid ioctl
> audit: type=1326 audit(1503608739.537:12): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=5936 comm="syz-executor5"
> exe="/root/syz-executor5" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535
> sclass=netlink_route_socket pig=5979 comm=syz-executor4
> tc_ctl_action: received NO action attribs
> SELinux: unrecognized netlink message: protocol=0 nlmsg_type=65535
> sclass=netlink_route_socket pig=5979 comm=syz-executor4
> sock: sock_set_timeout: `syz-executor2' (pid 5997) tries to set negative
> timeout
> sock: sock_set_timeout: `syz-executor2' (pid 5997) tries to set negative
> timeout
> tc_ctl_action: received NO action attribs
> sctp: [Deprecated]: syz-executor1 (pid 6154) Use of int in max_burst socket
> option deprecated.
> Use struct sctp_assoc_value instead
> sctp: [Deprecated]: syz-executor1 (pid 6156) Use of int in max_burst socket
> option deprecated.
> Use struct sctp_assoc_value instead
> QAT: Invalid ioctl
> SELinux: unknown mount option
> SELinux: unknown mount option
> QAT: Invalid ioctl
> audit: type=1326 audit(1503608741.554:13): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=6438 comm="syz-executor2"
> exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> audit: type=1326 audit(1503608741.579:14): auid=4294967295 uid=0 gid=0
> ses=4294967295 subj=kernel pid=6438 comm="syz-executor2"
> exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0
> ip=0x4512e9 code=0xffff0000
> PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex
> *** Guest State ***
> CR0: actual=0x0000000080000031, shadow=0x0000000060000011,
> gh_mask=fffffffffffffff7
> CR4: actual=0x0000000000006154, shadow=0x0000000000004164,
> gh_mask=fffffffffffff871
> CR3 = 0x00000000fffbc000
> RSP = 0x0000000000000f80 RIP = 0x0000000000000000
> RFLAGS=0x00000002 DR7 = 0x0000000000000400
> Sysenter RSP=0000000000000f80 CS:RIP=0050:0000000000002810
> CS: sel=0x0000, attr=0x0409b, limit=0x000fffff, base=0x0000000000000000
> DS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000
> SS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000
> ES: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000
> FS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000
> GS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000
> GDTR: limit=0x000007ff, base=0x0000000000001000
> LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800
> IDTR: limit=0x000001ff, base=0x0000000000003800
> TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, base=0x0000000000000000
> EFER = 0x0000000000000001 PAT = 0x0007040600070406
> DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000
> Interruptibility = 00000000 ActivityState = 00000000
> *** Host State ***
> RIP = 0xffffffff811b6277 RSP = 0xffff8801c8a074c8
> CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
> FSBase=00007f51db980700 GSBase=ffff8801db200000 TRBase=ffff8801db223100
> GDTBase=ffffffffff577000 IDTBase=ffffffffff57b000
> CR0=0000000080050033 CR3=00000001cf27f000 CR4=00000000001426f0
> Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff84d9d0a0
> EFER = 0x0000000000000d01 PAT = 0x0000000000000000
> *** Control State ***
> PinBased=0000003f CPUBased=b699edfa SecondaryExec=0000004a
> EntryControls=0000d1ff ExitControls=0023efff
> ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000
> VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000
> VMExit: intr_info=00000000 errcode=00000000 ilen=00000000
> reason=80000021 qualification=0000000000000000
> IDTVectoring: info=00000000 errcode=00000000
> TSC Offset = 0xffffffd760e51039
> EPT pointer = 0x00000001d8af001e
> PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex
> nla_parse: 28 callbacks suppressed
> netlink: 5 bytes leftover after parsing attributes in process
> `syz-executor2'.
> netlink: 5 bytes leftover after parsing attributes in process
> `syz-executor2'.
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzkaller@googlegroups.com.
> Please credit me with: Reported-by: syzbot <syzkaller@googlegroups.com>
>
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