Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.255' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.684158][ T8498] loop0: detected capacity change from 4 to 0 [ 75.697420][ T8498] ================================================================================ [ 75.706896][ T8498] UBSAN: shift-out-of-bounds in fs/ext4/super.c:4190:25 [ 75.713856][ T8498] shift exponent 589825 is too large for 32-bit type 'int' [ 75.722673][ T8498] CPU: 1 PID: 8498 Comm: syz-executor023 Not tainted 5.10.0-rc6-next-20201207-syzkaller #0 [ 75.732679][ T8498] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.742751][ T8498] Call Trace: [ 75.746088][ T8498] dump_stack+0x107/0x163 [ 75.750550][ T8498] ubsan_epilogue+0xb/0x5a [ 75.754976][ T8498] __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 [ 75.761870][ T8498] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 75.768119][ T8498] ext4_fill_super.cold+0x154/0x3ce [ 75.773318][ T8498] ? lock_downgrade+0x6d0/0x6d0 [ 75.778176][ T8498] ? snprintf+0xbb/0xf0 [ 75.782320][ T8498] ? ext4_calculate_overhead+0x1390/0x1390 [ 75.788826][ T8498] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 75.794530][ T8498] ? set_blocksize+0x1c1/0x400 [ 75.799289][ T8498] mount_bdev+0x34d/0x410 [ 75.803609][ T8498] ? ext4_calculate_overhead+0x1390/0x1390 [ 75.809491][ T8498] ? __save_error_info+0x800/0x800 [ 75.814595][ T8498] legacy_get_tree+0x105/0x220 [ 75.819347][ T8498] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.825683][ T8498] ? ns_capable_common+0x117/0x140 [ 75.830787][ T8498] vfs_get_tree+0x89/0x2f0 [ 75.835773][ T8498] path_mount+0x12ae/0x1e70 [ 75.840301][ T8498] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 75.846545][ T8498] ? strncpy_from_user+0x2a0/0x3e0 [ 75.851669][ T8498] ? finish_automount+0xb20/0xb20 [ 75.856684][ T8498] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.863425][ T8498] ? getname_flags.part.0+0x1dd/0x4f0 [ 75.868797][ T8498] __x64_sys_mount+0x27f/0x300 [ 75.873561][ T8498] ? copy_mnt_ns+0xae0/0xae0 [ 75.878147][ T8498] ? syscall_enter_from_user_mode+0x1d/0x50 [ 75.884045][ T8498] do_syscall_64+0x2d/0x70 [ 75.888452][ T8498] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 75.894330][ T8498] RIP: 0033:0x446d6a [ 75.898219][ T8498] 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 [ 75.918264][ T8498] RSP: 002b:00007ffc2d215018 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 75.926679][ T8498] RAX: ffffffffffffffda RBX: 00007ffc2d215070 RCX: 0000000000446d6a [ 75.937421][ T8498] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc2d215030 [ 75.945387][ T8498] RBP: 00007ffc2d215030 R08: 00007ffc2d215070 R09: 0000000000000000 [ 75.953350][ T8498] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 [ 75.961397][ T8498] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 75.971209][ T8498] ================================================================================ [ 75.981715][ T8498] Kernel panic - not syncing: panic_on_warn set ... [ 75.988327][ T8498] CPU: 0 PID: 8498 Comm: syz-executor023 Not tainted 5.10.0-rc6-next-20201207-syzkaller #0 [ 75.998615][ T8498] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.008677][ T8498] Call Trace: [ 76.011963][ T8498] dump_stack+0x107/0x163 [ 76.016286][ T8498] panic+0x343/0x77f [ 76.020163][ T8498] ? __warn_printk+0xf3/0xf3 [ 76.024744][ T8498] ? ubsan_epilogue+0x3e/0x5a [ 76.029422][ T8498] ubsan_epilogue+0x54/0x5a [ 76.033930][ T8498] __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 [ 76.040729][ T8498] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 76.046971][ T8498] ext4_fill_super.cold+0x154/0x3ce [ 76.052167][ T8498] ? lock_downgrade+0x6d0/0x6d0 [ 76.057015][ T8498] ? snprintf+0xbb/0xf0 [ 76.061161][ T8498] ? ext4_calculate_overhead+0x1390/0x1390 [ 76.066972][ T8498] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 76.072674][ T8498] ? set_blocksize+0x1c1/0x400 [ 76.077429][ T8498] mount_bdev+0x34d/0x410 [ 76.081742][ T8498] ? ext4_calculate_overhead+0x1390/0x1390 [ 76.087535][ T8498] ? __save_error_info+0x800/0x800 [ 76.092654][ T8498] legacy_get_tree+0x105/0x220 [ 76.097421][ T8498] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 76.103645][ T8498] ? ns_capable_common+0x117/0x140 [ 76.108761][ T8498] vfs_get_tree+0x89/0x2f0 [ 76.113163][ T8498] path_mount+0x12ae/0x1e70 [ 76.117651][ T8498] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 76.123874][ T8498] ? strncpy_from_user+0x2a0/0x3e0 [ 76.128973][ T8498] ? finish_automount+0xb20/0xb20 [ 76.133979][ T8498] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 76.140199][ T8498] ? getname_flags.part.0+0x1dd/0x4f0 [ 76.145557][ T8498] __x64_sys_mount+0x27f/0x300 [ 76.150306][ T8498] ? copy_mnt_ns+0xae0/0xae0 [ 76.154887][ T8498] ? syscall_enter_from_user_mode+0x1d/0x50 [ 76.160764][ T8498] do_syscall_64+0x2d/0x70 [ 76.165180][ T8498] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 76.171055][ T8498] RIP: 0033:0x446d6a [ 76.174957][ T8498] 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 [ 76.195063][ T8498] RSP: 002b:00007ffc2d215018 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 76.203468][ T8498] RAX: ffffffffffffffda RBX: 00007ffc2d215070 RCX: 0000000000446d6a [ 76.211427][ T8498] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc2d215030 [ 76.219386][ T8498] RBP: 00007ffc2d215030 R08: 00007ffc2d215070 R09: 0000000000000000 [ 76.227350][ T8498] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 [ 76.235306][ T8498] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 76.244326][ T8498] Kernel Offset: disabled [ 76.248776][ T8498] Rebooting in 86400 seconds..