[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.0.247' (ECDSA) to the list of known hosts. syzkaller login: [ 62.835835][ T28] audit: type=1400 audit(1594580122.000:8): avc: denied { execmem } for pid=6805 comm="syz-executor740" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 62.859613][ T6806] IPVS: ftp: loaded support on port[0] = 21 [ 62.948639][ T6806] chnl_net:caif_netlink_parms(): no params data found [ 62.996494][ T6806] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.003848][ T6806] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.013341][ T6806] device bridge_slave_0 entered promiscuous mode [ 63.023250][ T6806] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.030786][ T6806] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.038877][ T6806] device bridge_slave_1 entered promiscuous mode [ 63.058693][ T6806] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 63.070237][ T6806] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 63.092651][ T6806] team0: Port device team_slave_0 added [ 63.099966][ T6806] team0: Port device team_slave_1 added [ 63.117312][ T6806] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 63.124308][ T6806] 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. [ 63.151008][ T6806] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 63.163730][ T6806] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 63.171260][ T6806] 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. [ 63.197815][ T6806] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 63.279398][ T6806] device hsr_slave_0 entered promiscuous mode [ 63.316676][ T6806] device hsr_slave_1 entered promiscuous mode [ 63.461236][ T6806] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 63.498415][ T6806] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 63.549736][ T6806] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 63.598109][ T6806] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 63.652638][ T6806] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.659829][ T6806] bridge0: port 2(bridge_slave_1) entered forwarding state [ 63.668178][ T6806] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.675232][ T6806] bridge0: port 1(bridge_slave_0) entered forwarding state [ 63.719649][ T6806] 8021q: adding VLAN 0 to HW filter on device bond0 [ 63.732361][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 63.742602][ T2519] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.750888][ T2519] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.759603][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 63.772299][ T6806] 8021q: adding VLAN 0 to HW filter on device team0 [ 63.784268][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 63.792993][ T2519] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.800113][ T2519] bridge0: port 1(bridge_slave_0) entered forwarding state [ 63.812206][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 63.821391][ T2645] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.828523][ T2645] bridge0: port 2(bridge_slave_1) entered forwarding state [ 63.847128][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 63.860405][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 63.869000][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 63.880930][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 63.894037][ T6806] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 63.906660][ T6806] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 63.914451][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 63.933518][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 63.941078][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 63.954774][ T6806] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 63.973030][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 63.982553][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 64.003873][ T6806] device veth0_vlan entered promiscuous mode [ 64.012217][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 64.022092][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 64.032159][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 64.042821][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 64.057352][ T6806] device veth1_vlan entered promiscuous mode [ 64.078556][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 64.086747][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 64.094603][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 64.104281][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 64.115559][ T6806] device veth0_macvtap entered promiscuous mode [ 64.126627][ T6806] device veth1_macvtap entered promiscuous mode [ 64.143689][ T6806] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 64.151367][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 64.160345][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 64.168838][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 64.177712][ T2485] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 64.189021][ T6806] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 64.200612][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 64.209641][ T2645] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 64.355072][ T28] audit: type=1800 audit(1594580123.520:9): pid=6806 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="syz-executor740" name="file0" dev="sda1" ino=15709 res=0 [ 64.365092][ T6806] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 64.388860][ T6806] Process accounting resumed [ 64.395031][ T6806] ================================================================== [ 64.403221][ T6806] BUG: KASAN: use-after-free in get_block+0x1103/0x13a0 [ 64.410153][ T6806] Read of size 2 at addr ffff88808380318a by task syz-executor740/6806 [ 64.418380][ T6806] [ 64.420710][ T6806] CPU: 0 PID: 6806 Comm: syz-executor740 Not tainted 5.8.0-rc4-syzkaller #0 [ 64.429372][ T6806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.439421][ T6806] Call Trace: [ 64.442716][ T6806] dump_stack+0x18f/0x20d [ 64.447052][ T6806] ? get_block+0x1103/0x13a0 [ 64.451666][ T6806] ? get_block+0x1103/0x13a0 [ 64.457211][ T6806] print_address_description.constprop.0.cold+0xae/0x436 [ 64.464234][ T6806] ? lock_release+0x8d0/0x8d0 [ 64.468924][ T6806] ? __wait_on_bit+0x190/0x190 [ 64.473690][ T6806] ? lockdep_hardirqs_off+0x66/0xa0 [ 64.479847][ T6806] ? vprintk_func+0x97/0x1a6 [ 64.484442][ T6806] ? get_block+0x1103/0x13a0 [ 64.489036][ T6806] kasan_report.cold+0x1f/0x37 [ 64.493803][ T6806] ? get_block+0x1103/0x13a0 [ 64.498398][ T6806] get_block+0x1103/0x13a0 [ 64.502831][ T6806] ? free_branches+0x270/0x270 [ 64.507611][ T6806] ? create_empty_buffers+0x58f/0x820 [ 64.512983][ T6806] ? do_raw_spin_unlock+0x171/0x230 [ 64.518188][ T6806] minix_get_block+0xe5/0x110 [ 64.522869][ T6806] ? minix_rename+0x8c0/0x8c0 [ 64.527558][ T6806] __block_write_begin_int+0x464/0x1a80 [ 64.533099][ T6806] ? minix_rename+0x8c0/0x8c0 [ 64.537780][ T6806] ? __page_cache_alloc+0x10b/0x450 [ 64.542959][ T6806] ? remove_inode_buffers+0x1b0/0x1b0 [ 64.548327][ T6806] ? lock_downgrade+0x820/0x820 [ 64.553185][ T6806] ? wait_for_stable_page+0x11c/0x1e0 [ 64.558568][ T6806] ? minix_rename+0x8c0/0x8c0 [ 64.563247][ T6806] block_write_begin+0x58/0x2e0 [ 64.568110][ T6806] minix_write_begin+0x35/0x220 [ 64.572968][ T6806] generic_perform_write+0x20a/0x4f0 [ 64.578294][ T6806] ? __mnt_drop_write_file+0x6f/0xa0 [ 64.583580][ T6806] ? generic_file_readonly_mmap+0x1b0/0x1b0 [ 64.589478][ T6806] ? current_time+0x2c0/0x2c0 [ 64.594158][ T6806] ? down_write+0xdb/0x150 [ 64.598577][ T6806] __generic_file_write_iter+0x24b/0x610 [ 64.604211][ T6806] ? __lock_acquire+0xc1e/0x56e0 [ 64.609971][ T6806] generic_file_write_iter+0x3a6/0x5c0 [ 64.615421][ T6806] ? __generic_file_write_iter+0x610/0x610 [ 64.621208][ T6806] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.627167][ T6806] new_sync_write+0x422/0x650 [ 64.631820][ T6806] ? new_sync_read+0x6e0/0x6e0 [ 64.636575][ T6806] ? do_acct_process+0xea7/0x10c0 [ 64.641607][ T6806] ? lock_release+0x8d0/0x8d0 [ 64.646264][ T6806] ? find_held_lock+0x2d/0x110 [ 64.651007][ T6806] ? lock_downgrade+0x820/0x820 [ 64.655847][ T6806] __kernel_write+0x3f8/0x500 [ 64.660529][ T6806] do_acct_process+0xcc2/0x10c0 [ 64.665364][ T6806] ? acct_on+0x770/0x770 [ 64.669590][ T6806] ? kmem_cache_free+0x261/0x310 [ 64.674505][ T6806] acct_process+0x3b7/0x4e6 [ 64.678988][ T6806] do_exit+0x197e/0x2a40 [ 64.683208][ T6806] ? __close_fd+0x1d6/0x200 [ 64.687703][ T6806] ? mm_update_next_owner+0x7a0/0x7a0 [ 64.693052][ T6806] ? lock_downgrade+0x820/0x820 [ 64.697877][ T6806] ? do_raw_spin_lock+0x120/0x2b0 [ 64.702904][ T6806] ? rwlock_bug.part.0+0x90/0x90 [ 64.707822][ T6806] ? mem_cgroup_move_charge_pte_range+0xcc0/0xcc0 [ 64.714213][ T6806] do_group_exit+0x125/0x310 [ 64.718782][ T6806] __x64_sys_exit_group+0x3a/0x50 [ 64.723782][ T6806] do_syscall_64+0x60/0xe0 [ 64.728176][ T6806] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.734059][ T6806] RIP: 0033:0x446c88 [ 64.737924][ T6806] Code: Bad RIP value. [ 64.741964][ T6806] RSP: 002b:00007fff60cb98e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 64.750349][ T6806] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000446c88 [ 64.758299][ T6806] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 64.766261][ T6806] RBP: 00000000004ca370 R08: 00000000000000e7 R09: ffffffffffffffd4 [ 64.774207][ T6806] R10: 00007fff60cb9800 R11: 0000000000000246 R12: 0000000000000001 [ 64.782240][ T6806] R13: 00000000006dda40 R14: 0000000000000000 R15: 0000000000000000 [ 64.790194][ T6806] [ 64.792515][ T6806] The buggy address belongs to the page: [ 64.798124][ T6806] page:ffffea00020e00c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 [ 64.807216][ T6806] flags: 0xfffe0000000000() [ 64.811696][ T6806] raw: 00fffe0000000000 ffffea00021e42c8 ffffea00020e7108 0000000000000000 [ 64.820271][ T6806] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 [ 64.828826][ T6806] page dumped because: kasan: bad access detected [ 64.835207][ T6806] [ 64.837517][ T6806] Memory state around the buggy address: [ 64.843138][ T6806] ffff888083803080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 64.851179][ T6806] ffff888083803100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 64.859219][ T6806] >ffff888083803180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 64.867254][ T6806] ^ [ 64.871560][ T6806] ffff888083803200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 64.879596][ T6806] ffff888083803280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 64.887669][ T6806] ================================================================== [ 64.895702][ T6806] Disabling lock debugging due to kernel taint [ 64.903974][ T6806] Kernel panic - not syncing: panic_on_warn set ... [ 64.910574][ T6806] CPU: 0 PID: 6806 Comm: syz-executor740 Tainted: G B 5.8.0-rc4-syzkaller #0 [ 64.920629][ T6806] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.930674][ T6806] Call Trace: [ 64.933954][ T6806] dump_stack+0x18f/0x20d [ 64.938261][ T6806] ? get_block+0x1030/0x13a0 [ 64.942826][ T6806] panic+0x2e3/0x75c [ 64.946699][ T6806] ? __warn_printk+0xf3/0xf3 [ 64.951265][ T6806] ? get_block+0x1103/0x13a0 [ 64.955843][ T6806] ? trace_hardirqs_on+0x55/0x220 [ 64.960982][ T6806] ? get_block+0x1103/0x13a0 [ 64.965542][ T6806] ? get_block+0x1103/0x13a0 [ 64.970111][ T6806] end_report+0x4d/0x53 [ 64.974258][ T6806] kasan_report.cold+0xd/0x37 [ 64.978914][ T6806] ? get_block+0x1103/0x13a0 [ 64.983488][ T6806] get_block+0x1103/0x13a0 [ 64.987881][ T6806] ? free_branches+0x270/0x270 [ 64.992635][ T6806] ? create_empty_buffers+0x58f/0x820 [ 64.998002][ T6806] ? do_raw_spin_unlock+0x171/0x230 [ 65.003172][ T6806] minix_get_block+0xe5/0x110 [ 65.007838][ T6806] ? minix_rename+0x8c0/0x8c0 [ 65.012508][ T6806] __block_write_begin_int+0x464/0x1a80 [ 65.018045][ T6806] ? minix_rename+0x8c0/0x8c0 [ 65.022696][ T6806] ? __page_cache_alloc+0x10b/0x450 [ 65.027867][ T6806] ? remove_inode_buffers+0x1b0/0x1b0 [ 65.033214][ T6806] ? lock_downgrade+0x820/0x820 [ 65.038129][ T6806] ? wait_for_stable_page+0x11c/0x1e0 [ 65.043480][ T6806] ? minix_rename+0x8c0/0x8c0 [ 65.048149][ T6806] block_write_begin+0x58/0x2e0 [ 65.052990][ T6806] minix_write_begin+0x35/0x220 [ 65.057829][ T6806] generic_perform_write+0x20a/0x4f0 [ 65.063092][ T6806] ? __mnt_drop_write_file+0x6f/0xa0 [ 65.068372][ T6806] ? generic_file_readonly_mmap+0x1b0/0x1b0 [ 65.074236][ T6806] ? current_time+0x2c0/0x2c0 [ 65.078889][ T6806] ? down_write+0xdb/0x150 [ 65.083280][ T6806] __generic_file_write_iter+0x24b/0x610 [ 65.088907][ T6806] ? __lock_acquire+0xc1e/0x56e0 [ 65.093837][ T6806] generic_file_write_iter+0x3a6/0x5c0 [ 65.099271][ T6806] ? __generic_file_write_iter+0x610/0x610 [ 65.105052][ T6806] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 65.111005][ T6806] new_sync_write+0x422/0x650 [ 65.115653][ T6806] ? new_sync_read+0x6e0/0x6e0 [ 65.120407][ T6806] ? do_acct_process+0xea7/0x10c0 [ 65.125404][ T6806] ? lock_release+0x8d0/0x8d0 [ 65.130141][ T6806] ? find_held_lock+0x2d/0x110 [ 65.134876][ T6806] ? lock_downgrade+0x820/0x820 [ 65.139721][ T6806] __kernel_write+0x3f8/0x500 [ 65.144382][ T6806] do_acct_process+0xcc2/0x10c0 [ 65.149210][ T6806] ? acct_on+0x770/0x770 [ 65.153442][ T6806] ? kmem_cache_free+0x261/0x310 [ 65.158357][ T6806] acct_process+0x3b7/0x4e6 [ 65.162835][ T6806] do_exit+0x197e/0x2a40 [ 65.167052][ T6806] ? __close_fd+0x1d6/0x200 [ 65.171704][ T6806] ? mm_update_next_owner+0x7a0/0x7a0 [ 65.177049][ T6806] ? lock_downgrade+0x820/0x820 [ 65.181872][ T6806] ? do_raw_spin_lock+0x120/0x2b0 [ 65.186869][ T6806] ? rwlock_bug.part.0+0x90/0x90 [ 65.191794][ T6806] ? mem_cgroup_move_charge_pte_range+0xcc0/0xcc0 [ 65.198285][ T6806] do_group_exit+0x125/0x310 [ 65.202848][ T6806] __x64_sys_exit_group+0x3a/0x50 [ 65.207860][ T6806] do_syscall_64+0x60/0xe0 [ 65.212261][ T6806] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.218387][ T6806] RIP: 0033:0x446c88 [ 65.222247][ T6806] Code: Bad RIP value. [ 65.226283][ T6806] RSP: 002b:00007fff60cb98e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 65.234661][ T6806] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000446c88 [ 65.242605][ T6806] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 65.250554][ T6806] RBP: 00000000004ca370 R08: 00000000000000e7 R09: ffffffffffffffd4 [ 65.258599][ T6806] R10: 00007fff60cb9800 R11: 0000000000000246 R12: 0000000000000001 [ 65.266545][ T6806] R13: 00000000006dda40 R14: 0000000000000000 R15: 0000000000000000 [ 65.275550][ T6806] Kernel Offset: disabled [ 65.279866][ T6806] Rebooting in 86400 seconds..