[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.18' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.432089][ T8443] loop0: detected capacity change from 16383 to 0 [ 53.446803][ T8443] ================================================================================ [ 53.457606][ T8443] UBSAN: shift-out-of-bounds in fs/exfat/super.c:471:28 [ 53.465922][ T8443] shift exponent 4294967294 is too large for 32-bit type 'int' [ 53.473875][ T8443] CPU: 0 PID: 8443 Comm: syz-executor876 Not tainted 5.11.0-rc4-syzkaller #0 [ 53.482935][ T8443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.493208][ T8443] Call Trace: [ 53.496512][ T8443] dump_stack+0x183/0x22e [ 53.500924][ T8443] ? log_buf_vmcoreinfo_setup+0x45d/0x45d [ 53.506659][ T8443] ? show_regs_print_info+0x12/0x12 [ 53.511877][ T8443] ? out_of_line_wait_on_bit+0x1c3/0x240 [ 53.517601][ T8443] ? bit_wait+0xc0/0xc0 [ 53.521760][ T8443] __ubsan_handle_shift_out_of_bounds+0x432/0x4d0 [ 53.528198][ T8443] exfat_fill_super+0x2acb/0x2d00 [ 53.533230][ T8443] ? exfat_reconfigure+0xa0/0xa0 [ 53.538182][ T8443] ? set_blocksize+0x1f5/0x3c0 [ 53.542937][ T8443] get_tree_bdev+0x406/0x630 [ 53.547516][ T8443] ? exfat_reconfigure+0xa0/0xa0 [ 53.552456][ T8443] vfs_get_tree+0x86/0x270 [ 53.556870][ T8443] path_mount+0x1937/0x2c50 [ 53.561552][ T8443] ? mark_mounts_for_expiry+0x520/0x520 [ 53.567099][ T8443] ? getname_flags+0x1fe/0x640 [ 53.571886][ T8443] __se_sys_mount+0x2f9/0x3b0 [ 53.576572][ T8443] ? __x64_sys_mount+0xc0/0xc0 [ 53.581353][ T8443] ? __x64_sys_mount+0x1c/0xc0 [ 53.586389][ T8443] do_syscall_64+0x2d/0x70 [ 53.590810][ T8443] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.596722][ T8443] RIP: 0033:0x446f8a [ 53.600623][ T8443] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 53.620260][ T8443] RSP: 002b:00007fff97c1b978 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 53.628683][ T8443] RAX: ffffffffffffffda RBX: 00007fff97c1b9d0 RCX: 0000000000446f8a [ 53.636650][ T8443] RDX: 0000000020000000 RSI: 0000000020000340 RDI: 00007fff97c1b990 [ 53.644620][ T8443] RBP: 00007fff97c1b990 R08: 00007fff97c1b9d0 R09: 00007fff00000015 [ 53.652856][ T8443] R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000c [ 53.660840][ T8443] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 53.669782][ T8443] ================================================================================ [ 53.679583][ T8443] Kernel panic - not syncing: panic_on_warn set ... [ 53.686289][ T8443] CPU: 1 PID: 8443 Comm: syz-executor876 Not tainted 5.11.0-rc4-syzkaller #0 [ 53.695191][ T8443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.705709][ T8443] Call Trace: [ 53.709031][ T8443] dump_stack+0x183/0x22e [ 53.713377][ T8443] ? log_buf_vmcoreinfo_setup+0x45d/0x45d [ 53.719118][ T8443] ? show_regs_print_info+0x12/0x12 [ 53.724348][ T8443] panic+0x2e1/0x850 [ 53.728248][ T8443] ? __ubsan_handle_shift_out_of_bounds+0x455/0x4d0 [ 53.734835][ T8443] ? nmi_panic+0x90/0x90 [ 53.739066][ T8443] ? log_buf_vmcoreinfo_setup+0x45d/0x45d [ 53.744799][ T8443] ? out_of_line_wait_on_bit+0x1c3/0x240 [ 53.750689][ T8443] ? bit_wait+0xc0/0xc0 [ 53.754847][ T8443] __ubsan_handle_shift_out_of_bounds+0x4cc/0x4d0 [ 53.761272][ T8443] exfat_fill_super+0x2acb/0x2d00 [ 53.766314][ T8443] ? exfat_reconfigure+0xa0/0xa0 [ 53.771251][ T8443] ? set_blocksize+0x1f5/0x3c0 [ 53.776006][ T8443] get_tree_bdev+0x406/0x630 [ 53.780598][ T8443] ? exfat_reconfigure+0xa0/0xa0 [ 53.785525][ T8443] vfs_get_tree+0x86/0x270 [ 53.790030][ T8443] path_mount+0x1937/0x2c50 [ 53.794535][ T8443] ? mark_mounts_for_expiry+0x520/0x520 [ 53.800069][ T8443] ? getname_flags+0x1fe/0x640 [ 53.804827][ T8443] __se_sys_mount+0x2f9/0x3b0 [ 53.809521][ T8443] ? __x64_sys_mount+0xc0/0xc0 [ 53.814290][ T8443] ? __x64_sys_mount+0x1c/0xc0 [ 53.819047][ T8443] do_syscall_64+0x2d/0x70 [ 53.823470][ T8443] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.829350][ T8443] RIP: 0033:0x446f8a [ 53.833239][ T8443] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 53.853016][ T8443] RSP: 002b:00007fff97c1b978 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 53.861545][ T8443] RAX: ffffffffffffffda RBX: 00007fff97c1b9d0 RCX: 0000000000446f8a [ 53.869563][ T8443] RDX: 0000000020000000 RSI: 0000000020000340 RDI: 00007fff97c1b990 [ 53.877539][ T8443] RBP: 00007fff97c1b990 R08: 00007fff97c1b9d0 R09: 00007fff00000015 [ 53.885624][ T8443] R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000c [ 53.893614][ T8443] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 53.902269][ T8443] Kernel Offset: disabled [ 53.906701][ T8443] Rebooting in 86400 seconds..