[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.512124] IPVS: ftp: loaded support on port[0] = 21 [ 27.649727] audit: type=1800 audit(1631468243.413:2): pid=7983 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor040" name="/" dev="fuse" ino=1 res=0 [ 27.861547] ================================================================== [ 27.869070] BUG: KASAN: stack-out-of-bounds in iov_iter_revert+0x800/0x900 [ 27.876081] Read of size 8 at addr ffff8880a17dfd38 by task syz-executor040/7982 [ 27.883602] [ 27.885215] CPU: 0 PID: 7982 Comm: syz-executor040 Not tainted 4.14.246-syzkaller #0 [ 27.893075] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.902407] Call Trace: [ 27.904979] dump_stack+0x1b2/0x281 [ 27.908590] print_address_description.cold+0x54/0x1d3 [ 27.913861] kasan_report_error.cold+0x8a/0x191 [ 27.918512] ? iov_iter_revert+0x800/0x900 [ 27.922731] __asan_report_load8_noabort+0x68/0x70 [ 27.927645] ? iov_iter_revert+0x800/0x900 [ 27.931861] iov_iter_revert+0x800/0x900 [ 27.935908] ? mapping_needs_writeback+0xd4/0x110 [ 27.940729] ? filemap_check_errors+0x75/0x90 [ 27.945204] generic_file_read_iter+0x1183/0x21c0 [ 27.950033] fuse_file_read_iter+0x185/0x220 [ 27.954427] __vfs_read+0x449/0x620 [ 27.958035] ? vfs_copy_file_range+0x9b0/0x9b0 [ 27.962601] ? rw_verify_area+0xe1/0x2a0 [ 27.966642] vfs_read+0x139/0x340 [ 27.970077] SyS_read+0xf2/0x210 [ 27.973424] ? kernel_write+0x110/0x110 [ 27.977377] ? do_syscall_64+0x4c/0x640 [ 27.981330] ? kernel_write+0x110/0x110 [ 27.985281] do_syscall_64+0x1d5/0x640 [ 27.989166] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.994339] RIP: 0033:0x445ea9 [ 27.997508] RSP: 002b:00007fec131c82f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 28.005194] RAX: ffffffffffffffda RBX: 00000000004d14f0 RCX: 0000000000445ea9 [ 28.012444] RDX: 000000002000a3a0 RSI: 0000000020008380 RDI: 0000000000000005 [ 28.019699] RBP: 00000000004a10dc R08: 0000000000000000 R09: 0000000000000000 [ 28.026951] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 28.034201] R13: 000000000049d0d0 R14: 000000000049f0d8 R15: 00000000004d14f8 [ 28.041459] [ 28.043080] The buggy address belongs to the page: [ 28.047991] page:ffffea000285f7c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 28.056110] flags: 0xfff00000000000() [ 28.059890] raw: 00fff00000000000 0000000000000000 0000000000000000 00000000ffffffff [ 28.067751] raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 [ 28.075607] page dumped because: kasan: bad access detected [ 28.081292] [ 28.082897] Memory state around the buggy address: [ 28.087805] ffff8880a17dfc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 28.095143] ffff8880a17dfc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 28.102481] >ffff8880a17dfd00: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00 [ 28.109818] ^ [ 28.114985] ffff8880a17dfd80: 00 f2 f2 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 [ 28.122320] ffff8880a17dfe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 28.129656] ================================================================== [ 28.136987] Disabling lock debugging due to kernel taint [ 28.144767] Kernel panic - not syncing: panic_on_warn set ... [ 28.144767] [ 28.152144] CPU: 0 PID: 7982 Comm: syz-executor040 Tainted: G B 4.14.246-syzkaller #0 [ 28.161227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.170558] Call Trace: [ 28.173128] dump_stack+0x1b2/0x281 [ 28.176732] panic+0x1f9/0x42d [ 28.179902] ? add_taint.cold+0x16/0x16 [ 28.183852] ? ___preempt_schedule+0x16/0x18 [ 28.188241] kasan_end_report+0x43/0x49 [ 28.192310] kasan_report_error.cold+0xa7/0x191 [ 28.197011] ? iov_iter_revert+0x800/0x900 [ 28.201228] __asan_report_load8_noabort+0x68/0x70 [ 28.206137] ? iov_iter_revert+0x800/0x900 [ 28.210507] iov_iter_revert+0x800/0x900 [ 28.214550] ? mapping_needs_writeback+0xd4/0x110 [ 28.219376] ? filemap_check_errors+0x75/0x90 [ 28.223855] generic_file_read_iter+0x1183/0x21c0 [ 28.228682] fuse_file_read_iter+0x185/0x220 [ 28.233066] __vfs_read+0x449/0x620 [ 28.236669] ? vfs_copy_file_range+0x9b0/0x9b0 [ 28.241269] ? rw_verify_area+0xe1/0x2a0 [ 28.245307] vfs_read+0x139/0x340 [ 28.248739] SyS_read+0xf2/0x210 [ 28.252081] ? kernel_write+0x110/0x110 [ 28.256029] ? do_syscall_64+0x4c/0x640 [ 28.259979] ? kernel_write+0x110/0x110 [ 28.263929] do_syscall_64+0x1d5/0x640 [ 28.267794] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.272966] RIP: 0033:0x445ea9 [ 28.276132] RSP: 002b:00007fec131c82f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 28.283824] RAX: ffffffffffffffda RBX: 00000000004d14f0 RCX: 0000000000445ea9 [ 28.291074] RDX: 000000002000a3a0 RSI: 0000000020008380 RDI: 0000000000000005 [ 28.298330] RBP: 00000000004a10dc R08: 0000000000000000 R09: 0000000000000000 [ 28.305577] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 28.312823] R13: 000000000049d0d0 R14: 000000000049f0d8 R15: 00000000004d14f8 [ 28.320312] Kernel Offset: disabled [ 28.323938] Rebooting in 86400 seconds..