[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. 2020/07/14 02:32:18 parsed 1 programs 2020/07/14 02:32:18 executed programs: 0 syzkaller login: [ 1049.890949][ T28] audit: type=1400 audit(1594693938.528:8): avc: denied { execmem } for pid=6838 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 1049.930382][ T6839] IPVS: ftp: loaded support on port[0] = 21 [ 1050.033474][ T6839] chnl_net:caif_netlink_parms(): no params data found [ 1050.082100][ T6839] bridge0: port 1(bridge_slave_0) entered blocking state [ 1050.090144][ T6839] bridge0: port 1(bridge_slave_0) entered disabled state [ 1050.097811][ T6839] device bridge_slave_0 entered promiscuous mode [ 1050.106797][ T6839] bridge0: port 2(bridge_slave_1) entered blocking state [ 1050.114138][ T6839] bridge0: port 2(bridge_slave_1) entered disabled state [ 1050.121951][ T6839] device bridge_slave_1 entered promiscuous mode [ 1050.140809][ T6839] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1050.151469][ T6839] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1050.173716][ T6839] team0: Port device team_slave_0 added [ 1050.181092][ T6839] team0: Port device team_slave_1 added [ 1050.197403][ T6839] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1050.204460][ T6839] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 1050.230490][ T6839] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1050.242868][ T6839] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1050.249922][ T6839] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 1050.275929][ T6839] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1050.341814][ T6839] device hsr_slave_0 entered promiscuous mode [ 1050.388740][ T6839] device hsr_slave_1 entered promiscuous mode [ 1050.534611][ T6839] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1050.592227][ T6839] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1050.640872][ T6839] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1050.680854][ T6839] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1050.735442][ T6839] bridge0: port 2(bridge_slave_1) entered blocking state [ 1050.742632][ T6839] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1050.750463][ T6839] bridge0: port 1(bridge_slave_0) entered blocking state [ 1050.757518][ T6839] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1050.801860][ T6839] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1050.814443][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1050.825656][ T2491] bridge0: port 1(bridge_slave_0) entered disabled state [ 1050.833877][ T2491] bridge0: port 2(bridge_slave_1) entered disabled state [ 1050.842294][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1050.855096][ T6839] 8021q: adding VLAN 0 to HW filter on device team0 [ 1050.866925][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1050.875705][ T6808] bridge0: port 1(bridge_slave_0) entered blocking state [ 1050.882819][ T6808] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1050.900657][ T7048] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1050.909582][ T7048] bridge0: port 2(bridge_slave_1) entered blocking state [ 1050.916605][ T7048] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1050.937578][ T6839] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1050.948418][ T6839] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1050.962468][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1050.971959][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1050.981141][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1050.991584][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1051.000110][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1051.007744][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1051.026328][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1051.033814][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1051.047480][ T6839] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1051.066141][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 1051.075561][ T6809] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1051.095868][ T6839] device veth0_vlan entered promiscuous mode [ 1051.107380][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 1051.116193][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1051.126118][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1051.134642][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1051.146686][ T6839] device veth1_vlan entered promiscuous mode [ 1051.167138][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1051.176279][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1051.184701][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1051.193175][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1051.203674][ T6839] device veth0_macvtap entered promiscuous mode [ 1051.214551][ T6839] device veth1_macvtap entered promiscuous mode [ 1051.231256][ T6839] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1051.240089][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1051.248098][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1051.256783][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1051.265448][ T6808] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1051.278715][ T6839] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1051.286179][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1051.295399][ T2491] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2020/07/14 02:32:23 executed programs: 148 2020/07/14 02:32:28 executed programs: 371 2020/07/14 02:32:33 executed programs: 576 2020/07/14 02:32:38 executed programs: 788 2020/07/14 02:32:43 executed programs: 1002 2020/07/14 02:32:48 executed programs: 1195 2020/07/14 02:32:53 executed programs: 1384 2020/07/14 02:32:58 executed programs: 1596 2020/07/14 02:33:03 executed programs: 1791 [ 1098.214894][ T1160] [ 1098.217255][ T1160] ====================================================== [ 1098.224259][ T1160] WARNING: possible circular locking dependency detected [ 1098.231267][ T1160] 5.8.0-rc5-syzkaller #0 Not tainted [ 1098.236535][ T1160] ------------------------------------------------------ [ 1098.243540][ T1160] khugepaged/1160 is trying to acquire lock: [ 1098.249499][ T1160] ffff888096255930 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: shmem_fallocate+0x153/0xd90 [ 1098.259810][ T1160] [ 1098.259810][ T1160] but task is already holding lock: [ 1098.267156][ T1160] ffffffff89c6c260 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x1554/0x2780 [ 1098.277758][ T1160] [ 1098.277758][ T1160] which lock already depends on the new lock. [ 1098.277758][ T1160] [ 1098.288128][ T1160] [ 1098.288128][ T1160] the existing dependency chain (in reverse order) is: [ 1098.297111][ T1160] [ 1098.297111][ T1160] -> #1 (fs_reclaim){+.+.}-{0:0}: [ 1098.304372][ T1160] __alloc_pages_nodemask+0x3d1/0x930 [ 1098.310268][ T1160] alloc_pages_vma+0xdd/0x720 [ 1098.315437][ T1160] shmem_alloc_page+0x11f/0x1f0 [ 1098.320781][ T1160] shmem_alloc_and_acct_page+0x161/0x8a0 [ 1098.326901][ T1160] shmem_getpage_gfp+0x511/0x2450 [ 1098.332413][ T1160] shmem_write_begin+0xf9/0x1d0 [ 1098.337806][ T1160] generic_perform_write+0x20a/0x4f0 [ 1098.343584][ T1160] __generic_file_write_iter+0x24b/0x610 [ 1098.349708][ T1160] generic_file_write_iter+0x3a6/0x5c0 [ 1098.355696][ T1160] new_sync_write+0x422/0x650 [ 1098.360864][ T1160] vfs_write+0x59d/0x6b0 [ 1098.365598][ T1160] ksys_write+0x12d/0x250 [ 1098.370536][ T1160] do_syscall_64+0x60/0xe0 [ 1098.375470][ T1160] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 1098.381850][ T1160] [ 1098.381850][ T1160] -> #0 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}: [ 1098.390541][ T1160] __lock_acquire+0x2acb/0x56e0 [ 1098.395884][ T1160] lock_acquire+0x1f1/0xad0 [ 1098.400875][ T1160] down_write+0x8d/0x150 [ 1098.405625][ T1160] shmem_fallocate+0x153/0xd90 [ 1098.410940][ T1160] ashmem_shrink_scan.part.0+0x2e9/0x490 [ 1098.417068][ T1160] ashmem_shrink_scan+0x6c/0xa0 [ 1098.422410][ T1160] do_shrink_slab+0x3c6/0xab0 [ 1098.427592][ T1160] shrink_slab+0x16f/0x5c0 [ 1098.432509][ T1160] shrink_node+0x519/0x1b60 [ 1098.437508][ T1160] do_try_to_free_pages+0x38b/0x1340 [ 1098.443291][ T1160] try_to_free_pages+0x29a/0x8b0 [ 1098.448724][ T1160] __alloc_pages_slowpath.constprop.0+0x949/0x2780 [ 1098.455718][ T1160] __alloc_pages_nodemask+0x68f/0x930 [ 1098.461626][ T1160] khugepaged_alloc_page+0xa0/0x170 [ 1098.467316][ T1160] khugepaged+0x3093/0x5a10 [ 1098.472349][ T1160] kthread+0x3b5/0x4a0 [ 1098.476945][ T1160] ret_from_fork+0x1f/0x30 [ 1098.481847][ T1160] [ 1098.481847][ T1160] other info that might help us debug this: [ 1098.481847][ T1160] [ 1098.492100][ T1160] Possible unsafe locking scenario: [ 1098.492100][ T1160] [ 1098.499525][ T1160] CPU0 CPU1 [ 1098.504863][ T1160] ---- ---- [ 1098.510200][ T1160] lock(fs_reclaim); [ 1098.514200][ T1160] lock(&sb->s_type->i_mutex_key#15); [ 1098.522146][ T1160] lock(fs_reclaim); [ 1098.528615][ T1160] lock(&sb->s_type->i_mutex_key#15); [ 1098.534045][ T1160] [ 1098.534045][ T1160] *** DEADLOCK *** [ 1098.534045][ T1160] [ 1098.542161][ T1160] 2 locks held by khugepaged/1160: [ 1098.547235][ T1160] #0: ffffffff89c6c260 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x1554/0x2780 [ 1098.558240][ T1160] #1: ffffffff89c46a90 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0xc7/0x5c0 [ 1098.567329][ T1160] [ 1098.567329][ T1160] stack backtrace: [ 1098.573331][ T1160] CPU: 1 PID: 1160 Comm: khugepaged Not tainted 5.8.0-rc5-syzkaller #0 [ 1098.581556][ T1160] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1098.591583][ T1160] Call Trace: [ 1098.594921][ T1160] dump_stack+0x18f/0x20d [ 1098.599230][ T1160] check_noncircular+0x324/0x3e0 [ 1098.604144][ T1160] ? print_circular_bug+0x3a0/0x3a0 [ 1098.609366][ T1160] ? __bfs+0x75/0x530 [ 1098.613397][ T1160] ? find_first_zero_bit+0x94/0xb0 [ 1098.618488][ T1160] ? add_lock_to_list.constprop.0+0x148/0x480 [ 1098.624532][ T1160] __lock_acquire+0x2acb/0x56e0 [ 1098.629357][ T1160] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 1098.635307][ T1160] ? ret_from_fork+0x1f/0x30 [ 1098.639869][ T1160] lock_acquire+0x1f1/0xad0 [ 1098.644352][ T1160] ? shmem_fallocate+0x153/0xd90 [ 1098.649263][ T1160] ? lock_release+0x8d0/0x8d0 [ 1098.653925][ T1160] ? check_usage_forwards+0x4d0/0x4d0 [ 1098.659311][ T1160] ? arch_stack_walk+0x81/0xf0 [ 1098.664052][ T1160] ? __bfs+0x75/0x530 [ 1098.668009][ T1160] ? lock_is_held_type+0xb0/0xe0 [ 1098.672916][ T1160] down_write+0x8d/0x150 [ 1098.677141][ T1160] ? shmem_fallocate+0x153/0xd90 [ 1098.682059][ T1160] ? down_write_killable+0x170/0x170 [ 1098.687316][ T1160] shmem_fallocate+0x153/0xd90 [ 1098.692053][ T1160] ? __lock_acquire+0xc1e/0x56e0 [ 1098.696961][ T1160] ? shmem_evict_inode+0xbc0/0xbc0 [ 1098.702097][ T1160] ? find_held_lock+0x2d/0x110 [ 1098.706842][ T1160] ? ashmem_shrink_scan.part.0+0x29e/0x490 [ 1098.712621][ T1160] ? lock_downgrade+0x820/0x820 [ 1098.717444][ T1160] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 1098.723399][ T1160] ? __mutex_unlock_slowpath+0xe2/0x610 [ 1098.728920][ T1160] ? wait_for_completion+0x260/0x260 [ 1098.734177][ T1160] ? lock_downgrade+0x820/0x820 [ 1098.739002][ T1160] ashmem_shrink_scan.part.0+0x2e9/0x490 [ 1098.744605][ T1160] ? ashmem_shrink_scan+0x50/0xa0 [ 1098.749600][ T1160] ashmem_shrink_scan+0x6c/0xa0 [ 1098.754421][ T1160] do_shrink_slab+0x3c6/0xab0 [ 1098.759074][ T1160] shrink_slab+0x16f/0x5c0 [ 1098.763479][ T1160] ? do_shrink_slab+0xab0/0xab0 [ 1098.768300][ T1160] ? mem_cgroup_iter+0x34f/0x740 [ 1098.773212][ T1160] shrink_node+0x519/0x1b60 [ 1098.777689][ T1160] do_try_to_free_pages+0x38b/0x1340 [ 1098.782945][ T1160] ? shrink_node+0x1b60/0x1b60 [ 1098.787745][ T1160] ? sched_clock_cpu+0x18/0x1b0 [ 1098.792584][ T1160] ? lock_is_held_type+0xb0/0xe0 [ 1098.797495][ T1160] try_to_free_pages+0x29a/0x8b0 [ 1098.802409][ T1160] ? reclaim_pages+0xcd0/0xcd0 [ 1098.807167][ T1160] ? _raw_spin_unlock_irq+0x1f/0x80 [ 1098.812345][ T1160] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 1098.818297][ T1160] __alloc_pages_slowpath.constprop.0+0x949/0x2780 [ 1098.824771][ T1160] ? lock_acquire+0x1f1/0xad0 [ 1098.829419][ T1160] ? warn_alloc+0x120/0x120 [ 1098.833893][ T1160] ? lock_downgrade+0x820/0x820 [ 1098.838725][ T1160] ? __zone_watermark_ok+0x370/0x370 [ 1098.843989][ T1160] ? lock_is_held_type+0xb0/0xe0 [ 1098.848900][ T1160] __alloc_pages_nodemask+0x68f/0x930 [ 1098.854257][ T1160] ? khugepaged+0xd20/0x5a10 [ 1098.858818][ T1160] ? find_held_lock+0x2d/0x110 [ 1098.863556][ T1160] ? __alloc_pages_slowpath.constprop.0+0x2780/0x2780 [ 1098.870304][ T1160] ? __up_read+0x1a1/0x7b0 [ 1098.874707][ T1160] ? _down_write_nest_lock+0x150/0x150 [ 1098.880173][ T1160] ? total_mapcount+0x1c3/0x570 [ 1098.884997][ T1160] khugepaged_alloc_page+0xa0/0x170 [ 1098.890167][ T1160] khugepaged+0x3093/0x5a10 [ 1098.894646][ T1160] ? collapse_pte_mapped_thp+0xb90/0xb90 [ 1098.900255][ T1160] ? __kthread_parkme+0xad/0x1e0 [ 1098.905166][ T1160] ? lock_downgrade+0x820/0x820 [ 1098.909987][ T1160] ? finish_wait+0x260/0x260 [ 1098.914550][ T1160] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 1098.920323][ T1160] ? __kthread_parkme+0x4c/0x1e0 [ 1098.925233][ T1160] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 1098.931204][ T1160] ? __kthread_parkme+0x13f/0x1e0 [ 1098.936199][ T1160] ? collapse_pte_mapped_thp+0xb90/0xb90 [ 1098.941802][ T1160] kthread+0x3b5/0x4a0 [ 1098.945841][ T1160] ? __kthread_bind_mask+0xc0/0xc0 [ 1098.950921][ T1160] ? __kthread_bind_mask+0xc0/0xc0 [ 1098.956006][ T1160] ret_from_fork+0x1f/0x30 2020/07/14 02:33:08 executed programs: 1953 2020/07/14 02:33:13 executed programs: 2189