./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor562362443 <...> Warning: Permanently added '10.128.0.219' (ED25519) to the list of known hosts. execve("./syz-executor562362443", ["./syz-executor562362443"], 0x7ffd27cca3a0 /* 10 vars */) = 0 brk(NULL) = 0x55557e132000 brk(0x55557e132d00) = 0x55557e132d00 arch_prctl(ARCH_SET_FS, 0x55557e132380) = 0 set_tid_address(0x55557e132650) = 5825 set_robust_list(0x55557e132660, 24) = 0 rseq(0x55557e132ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor562362443", 4096) = 27 getrandom("\x39\x2c\xf2\xda\x1c\xe4\xd3\xf6", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557e132d00 brk(0x55557e153d00) = 0x55557e153d00 brk(0x55557e154000) = 0x55557e154000 mprotect(0x7f651f21b000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 executing program write(1, "executing program\n", 18) = 18 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6516c00000 write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 2097152) = 2097152 munmap(0x7f6516c00000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 close(4) = 0 mkdir("./file0", 0777) = 0 mount("/dev/loop0", "./file0", "ext4", MS_RELATIME, "grpquota,,errors=continue") = 0 openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 chdir("./file0") = 0 [ 77.063034][ T5825] loop0: detected capacity change from 0 to 4096 [ 77.100484][ T5825] EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) chdir("./file0") = 0 [ 77.149520][ T5825] usercopy: Kernel memory exposure attempt detected from SLUB object 'ext4_inode_cache' (offset 0, size 176)! [ 77.161426][ T5825] ------------[ cut here ]------------ [ 77.166938][ T5825] kernel BUG at mm/usercopy.c:102! [ 77.172099][ T5825] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI [ 77.179048][ T5825] CPU: 0 UID: 0 PID: 5825 Comm: syz-executor562 Not tainted 6.13.0-syzkaller-09793-g69b8923f5003 #0 [ 77.189811][ T5825] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 [ 77.199869][ T5825] RIP: 0010:usercopy_abort+0x84/0x90 [ 77.205183][ T5825] Code: 49 89 ce 48 c7 c3 80 5f 18 8c 48 0f 44 de 48 c7 c7 20 5e 18 8c 4c 89 de 48 89 c1 41 52 41 56 53 e8 d1 3a f5 fe 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 [ 77.224821][ T5825] RSP: 0018:ffffc9000403fc90 EFLAGS: 00010296 [ 77.230918][ T5825] RAX: 000000000000006b RBX: ffffffff8c185f80 RCX: 45037ad9c629e200 [ 77.238894][ T5825] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 77.246859][ T5825] RBP: 0000000000000000 R08: ffffffff819f1fbc R09: 1ffff92000807f2c [ 77.254845][ T5825] R10: dffffc0000000000 R11: fffff52000807f2d R12: ffffea0001afc000 [ 77.262850][ T5825] R13: 00000000000000b0 R14: 0000000000000000 R15: 00000000000000b0 [ 77.270905][ T5825] FS: 000055557e132380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 [ 77.279828][ T5825] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.286406][ T5825] CR2: 000055647ffdc6c8 CR3: 0000000012956000 CR4: 00000000003526f0 [ 77.294369][ T5825] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.302330][ T5825] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.310293][ T5825] Call Trace: [ 77.313566][ T5825] [ 77.316510][ T5825] ? __die_body+0x5f/0xb0 [ 77.320848][ T5825] ? die+0x9e/0xc0 [ 77.324591][ T5825] ? do_trap+0x15a/0x3a0 [ 77.328853][ T5825] ? usercopy_abort+0x84/0x90 [ 77.333531][ T5825] ? do_error_trap+0x1dc/0x2c0 [ 77.338307][ T5825] ? usercopy_abort+0x84/0x90 [ 77.342980][ T5825] ? __pfx_do_error_trap+0x10/0x10 [ 77.348105][ T5825] ? handle_invalid_op+0x34/0x40 [ 77.353037][ T5825] ? usercopy_abort+0x84/0x90 [ 77.357725][ T5825] ? exc_invalid_op+0x38/0x50 [ 77.362407][ T5825] ? asm_exc_invalid_op+0x1a/0x20 [ 77.367430][ T5825] ? __wake_up_klogd+0xcc/0x110 [ 77.372301][ T5825] ? usercopy_abort+0x84/0x90 [ 77.376975][ T5825] __check_heap_object+0xb1/0x100 [ 77.381998][ T5825] __check_object_size+0x1da/0x730 [ 77.387105][ T5825] vfs_readlink+0x1cf/0x550 [ 77.391600][ T5825] ? rcu_is_watching+0x15/0xb0 [ 77.396384][ T5825] ? __pfx_vfs_readlink+0x10/0x10 [ 77.401416][ T5825] ? touch_atime+0x521/0x690 [ 77.406021][ T5825] do_readlinkat+0x249/0x3a0 [ 77.410646][ T5825] ? __pfx_do_readlinkat+0x10/0x10 [ 77.415772][ T5825] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 77.422109][ T5825] ? do_syscall_64+0x100/0x230 [ 77.426893][ T5825] __x64_sys_readlinkat+0x9a/0xb0 [ 77.431952][ T5825] do_syscall_64+0xf3/0x230 [ 77.436475][ T5825] ? clear_bhb_loop+0x35/0x90 [ 77.441162][ T5825] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.447082][ T5825] RIP: 0033:0x7f651f1a7639 [ 77.451518][ T5825] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 77.471119][ T5825] RSP: 002b:00007ffc5182e968 EFLAGS: 00000246 ORIG_RAX: 000000000000010b [ 77.479530][ T5825] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f651f1a7639 [ 77.487585][ T5825] RDX: 00000000200002c0 RSI: 0000000020000240 RDI: 00000000ffffff9c [ 77.495577][ T5825] RBP: 00007f651f21b610 R08: 0000000000000000 R09: 0000000000000000 [ 77.503625][ T5825] R10: 00000000000000b0 R11: 0000000000000246 R12: 0000000000000001 [ 77.511608][ T5825] R13: 00007ffc5182eb38 R14: 0000000000000001 R15: 0000000000000001 [ 77.519600][ T5825] [ 77.522616][ T5825] Modules linked in: [ 77.526889][ T5825] ---[ end trace 0000000000000000 ]--- [ 77.532801][ T5825] RIP: 0010:usercopy_abort+0x84/0x90 [ 77.538199][ T5825] Code: 49 89 ce 48 c7 c3 80 5f 18 8c 48 0f 44 de 48 c7 c7 20 5e 18 8c 4c 89 de 48 89 c1 41 52 41 56 53 e8 d1 3a f5 fe 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 [ 77.557897][ T5825] RSP: 0018:ffffc9000403fc90 EFLAGS: 00010296 [ 77.564007][ T5825] RAX: 000000000000006b RBX: ffffffff8c185f80 RCX: 45037ad9c629e200 [ 77.571991][ T5825] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 77.579996][ T5825] RBP: 0000000000000000 R08: ffffffff819f1fbc R09: 1ffff92000807f2c [ 77.588057][ T5825] R10: dffffc0000000000 R11: fffff52000807f2d R12: ffffea0001afc000 [ 77.596094][ T5825] R13: 00000000000000b0 R14: 0000000000000000 R15: 00000000000000b0 [ 77.604102][ T5825] FS: 000055557e132380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 [ 77.613025][ T5825] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.619638][ T5825] CR2: 000055647ffdc6c8 CR3: 0000000012956000 CR4: 00000000003526f0 [ 77.627644][ T5825] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.635648][ T5825] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.643685][ T5825] Kernel panic - not syncing: Fatal exception [ 77.649910][ T5825] Kernel Offset: disabled [ 77.654231][ T5825] Rebooting in 86400 seconds..