Starting System Logging Service... Starting Permit User Sessions... [ OK ] Started Daily apt download activities. [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. [ OK ] Started System Logging Service. [ OK ] Started Permit User Sessions. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ 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 tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ 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. Warning: Permanently added '10.128.0.71' (ECDSA) to the list of known hosts. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 77.433517][ T38] audit: type=1400 audit(1620493062.479:8): avc: denied { execmem } for pid=8395 comm="syz-executor642" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 78.584956][ T8400] IPVS: ftp: loaded support on port[0] = 21 [ 78.728549][ T160] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 78.736573][ T160] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 executing program [ 78.780991][ T9] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 78.783665][ T3135] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 78.796365][ T9] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 78.809871][ T3135] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 78.838239][ T8400] loop7: detected capacity change from 0 to 1036 [ 78.944658][ T8457] ================================================================================ [ 78.957400][ T8457] UBSAN: shift-out-of-bounds in fs/mpage.c:189:40 [ 78.965210][ T8457] shift exponent 4294967279 is too large for 64-bit type 'long long unsigned int' [ 78.975406][ T8457] CPU: 1 PID: 8457 Comm: systemd-udevd Not tainted 5.12.0-syzkaller #0 [ 78.983659][ T8457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.993703][ T8457] Call Trace: [ 78.996985][ T8457] dump_stack+0x141/0x1d7 [ 79.001343][ T8457] ubsan_epilogue+0xb/0x5a [ 79.005762][ T8457] __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 [ 79.012536][ T8457] ? find_held_lock+0x2d/0x110 [ 79.017320][ T8457] do_mpage_readpage.cold+0x226/0x2bb [ 79.022715][ T8457] ? lock_downgrade+0x6e0/0x6e0 [ 79.027594][ T8457] ? xas_start+0x152/0x730 [ 79.032020][ T8457] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 79.038274][ T8457] ? mpage_writepage+0x1b0/0x1b0 [ 79.043221][ T8457] ? __xa_clear_mark+0x110/0x110 [ 79.048166][ T8457] mpage_readahead+0x3a3/0x880 [ 79.052935][ T8457] ? do_mpage_readpage+0x2050/0x2050 [ 79.058243][ T8457] ? bdev_evict_inode+0x460/0x460 [ 79.063271][ T8457] ? lru_cache_add+0x594/0xb30 [ 79.068039][ T8457] ? lock_downgrade+0x6e0/0x6e0 [ 79.072897][ T8457] ? file_write_and_wait_range+0x200/0x200 [ 79.078710][ T8457] ? lock_downgrade+0x6e0/0x6e0 [ 79.083580][ T8457] ? blkdev_write_begin+0x40/0x40 [ 79.088608][ T8457] read_pages+0x1df/0x8d0 [ 79.092957][ T8457] ? readahead_expand+0x830/0x830 [ 79.097984][ T8457] ? add_to_page_cache_lru+0x2ab/0x5b0 [ 79.103448][ T8457] ? __page_cache_alloc+0x10d/0x3a0 [ 79.108666][ T8457] page_cache_ra_unbounded+0x61f/0x920 [ 79.114143][ T8457] ? find_held_lock+0x2d/0x110 [ 79.118911][ T8457] ? read_pages+0x8d0/0x8d0 [ 79.123417][ T8457] force_page_cache_ra+0x3ba/0x5b0 [ 79.128559][ T8457] page_cache_sync_ra+0x107/0x200 [ 79.133586][ T8457] filemap_get_pages+0x29f/0x1920 [ 79.138632][ T8457] ? deref_stack_reg+0xee/0x150 [ 79.143491][ T8457] ? __lock_page_async+0x4d0/0x4d0 [ 79.148608][ T8457] ? unwind_next_frame+0xec8/0x1ce0 [ 79.153812][ T8457] filemap_read+0x2ca/0xe40 [ 79.158336][ T8457] ? __kernel_text_address+0x5a/0xc0 [ 79.163644][ T8457] ? lock_chain_count+0x20/0x20 [ 79.168500][ T8457] ? mark_lock+0xef/0x17b0 [ 79.172922][ T8457] ? filemap_get_pages+0x1920/0x1920 [ 79.178217][ T8457] ? lock_chain_count+0x20/0x20 [ 79.183075][ T8457] ? lock_chain_count+0x20/0x20 [ 79.187935][ T8457] ? stack_trace_consume_entry+0x160/0x160 [ 79.193880][ T8457] ? __lock_acquire+0x16a7/0x5230 [ 79.198909][ T8457] generic_file_read_iter+0x397/0x4f0 [ 79.204294][ T8457] ? __lock_acquire+0x16a7/0x5230 [ 79.209324][ T8457] blkdev_read_iter+0x11b/0x180 [ 79.214181][ T8457] new_sync_read+0x41e/0x6e0 [ 79.218778][ T8457] ? ksys_lseek+0x1b0/0x1b0 [ 79.223284][ T8457] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 79.229532][ T8457] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 79.235259][ T8457] ? selinux_file_permission+0x92/0x520 [ 79.240816][ T8457] vfs_read+0x35c/0x570 [ 79.244983][ T8457] ksys_read+0x12d/0x250 [ 79.249245][ T8457] ? vfs_write+0xa30/0xa30 [ 79.253679][ T8457] ? __secure_computing+0x104/0x360 [ 79.258879][ T8457] do_syscall_64+0x3a/0xb0 [ 79.263564][ T8457] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 79.269461][ T8457] RIP: 0033:0x7fdc7280d210 [ 79.273876][ T8457] Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 [ 79.293500][ T8457] RSP: 002