./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3492256950 <...> Warning: Permanently added '10.128.10.31' (ED25519) to the list of known hosts. execve("./syz-executor3492256950", ["./syz-executor3492256950"], 0x7ffd630dcf90 /* 10 vars */) = 0 brk(NULL) = 0x5555602a7000 brk(0x5555602a7d00) = 0x5555602a7d00 arch_prctl(ARCH_SET_FS, 0x5555602a7380) = 0 set_tid_address(0x5555602a7650) = 5826 set_robust_list(0x5555602a7660, 24) = 0 rseq(0x5555602a7ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3492256950", 4096) = 28 getrandom("\xd9\x13\x19\x23\x65\xfd\xc9\xb6", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555602a7d00 brk(0x5555602c8d00) = 0x5555602c8d00 brk(0x5555602c9000) = 0x5555602c9000 mprotect(0x7fdaffb30000, 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) = 0x7fdaf7600000 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(0x7fdaf7600000, 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 [ 77.954088][ T5826] loop0: detected capacity change from 0 to 4096 mount("/dev/loop0", "./file0", "ext4", MS_RELATIME, "grpquota,,errors=continue") = 0 openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 chdir("./file0") = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) chdir("./file0") = 0 [ 77.998149][ T5826] EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. [ 78.057971][ T5826] usercopy: Kernel memory exposure attempt detected from SLUB object 'ext4_inode_cache' (offset 0, size 176)! [ 78.069938][ T5826] ------------[ cut here ]------------ [ 78.075395][ T5826] kernel BUG at mm/usercopy.c:102! [ 78.080589][ T5826] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI [ 78.087567][ T5826] CPU: 1 UID: 0 PID: 5826 Comm: syz-executor349 Not tainted 6.13.0-syzkaller-09793-g69b8923f5003 #0 [ 78.098325][ T5826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 [ 78.108374][ T5826] RIP: 0010:usercopy_abort+0x84/0x90 [ 78.113678][ T5826] 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 [ 78.133315][ T5826] RSP: 0018:ffffc90003fa7c90 EFLAGS: 00010296 [ 78.139392][ T5826] RAX: 000000000000006b RBX: ffffffff8c185f80 RCX: ba71ae4bd9cf0200 [ 78.147370][ T5826] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 78.155349][ T5826] RBP: 0000000000000000 R08: ffffffff819f1fbc R09: 1ffff920007f4f2c [ 78.163328][ T5826] R10: dffffc0000000000 R11: fffff520007f4f2d R12: ffffea0001e70200 [ 78.171398][ T5826] R13: 00000000000000b0 R14: 0000000000000000 R15: 00000000000000b0 [ 78.179467][ T5826] FS: 00005555602a7380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 [ 78.188394][ T5826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 78.194987][ T5826] CR2: 000000000066c7e0 CR3: 0000000078aac000 CR4: 00000000003526f0 [ 78.202972][ T5826] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 78.210936][ T5826] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 78.218915][ T5826] Call Trace: [ 78.222217][ T5826] [ 78.225146][ T5826] ? __die_body+0x5f/0xb0 [ 78.229491][ T5826] ? die+0x9e/0xc0 [ 78.233222][ T5826] ? do_trap+0x15a/0x3a0 [ 78.237470][ T5826] ? usercopy_abort+0x84/0x90 [ 78.242161][ T5826] ? do_error_trap+0x1dc/0x2c0 [ 78.246956][ T5826] ? usercopy_abort+0x84/0x90 [ 78.251660][ T5826] ? __pfx_do_error_trap+0x10/0x10 [ 78.256782][ T5826] ? handle_invalid_op+0x34/0x40 [ 78.261722][ T5826] ? usercopy_abort+0x84/0x90 [ 78.266399][ T5826] ? exc_invalid_op+0x38/0x50 [ 78.271088][ T5826] ? asm_exc_invalid_op+0x1a/0x20 [ 78.276111][ T5826] ? __wake_up_klogd+0xcc/0x110 [ 78.280967][ T5826] ? usercopy_abort+0x84/0x90 [ 78.285639][ T5826] __check_heap_object+0xb1/0x100 [ 78.290670][ T5826] __check_object_size+0x1da/0x730 [ 78.295782][ T5826] vfs_readlink+0x1cf/0x550 [ 78.300297][ T5826] ? rcu_is_watching+0x15/0xb0 [ 78.305061][ T5826] ? __pfx_vfs_readlink+0x10/0x10 [ 78.310082][ T5826] ? touch_atime+0x521/0x690 [ 78.314672][ T5826] do_readlinkat+0x249/0x3a0 [ 78.319267][ T5826] ? __pfx_do_readlinkat+0x10/0x10 [ 78.324380][ T5826] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 78.330793][ T5826] ? do_syscall_64+0x100/0x230 [ 78.335572][ T5826] __x64_sys_readlinkat+0x9a/0xb0 [ 78.340599][ T5826] do_syscall_64+0xf3/0x230 [ 78.345104][ T5826] ? clear_bhb_loop+0x35/0x90 [ 78.349886][ T5826] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.355787][ T5826] RIP: 0033:0x7fdaffabc639 [ 78.360206][ T5826] 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 [ 78.379989][ T5826] RSP: 002b:00007ffeb88c4948 EFLAGS: 00000246 ORIG_RAX: 000000000000010b [ 78.389116][ T5826] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fdaffabc639 [ 78.397107][ T5826] RDX: 00000000200002c0 RSI: 0000000020000240 RDI: 00000000ffffff9c [ 78.405118][ T5826] RBP: 00007fdaffb30610 R08: 0000000000000000 R09: 0000000000000000 [ 78.413091][ T5826] R10: 00000000000000b0 R11: 0000000000000246 R12: 0000000000000001 [ 78.421233][ T5826] R13: 00007ffeb88c4b18 R14: 0000000000000001 R15: 0000000000000001 [ 78.429222][ T5826] [ 78.432234][ T5826] Modules linked in: [ 78.436298][ T5826] ---[ end trace 0000000000000000 ]--- [ 78.442796][ T5826] RIP: 0010:usercopy_abort+0x84/0x90 [ 78.448210][ T5826] 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 [ 78.467891][ T5826] RSP: 0018:ffffc90003fa7c90 EFLAGS: 00010296 [ 78.474011][ T5826] RAX: 000000000000006b RBX: ffffffff8c185f80 RCX: ba71ae4bd9cf0200 [ 78.482072][ T5826] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 78.490239][ T5826] RBP: 0000000000000000 R08: ffffffff819f1fbc R09: 1ffff920007f4f2c [ 78.498327][ T5826] R10: dffffc0000000000 R11: fffff520007f4f2d R12: ffffea0001e70200 [ 78.506317][ T5826] R13: 00000000000000b0 R14: 0000000000000000 R15: 00000000000000b0 [ 78.514438][ T5826] FS: 00005555602a7380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 [ 78.523474][ T5826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 78.530115][ T5826] CR2: 000055dd00353bf8 CR3: 0000000078aac000 CR4: 00000000003526f0 [ 78.538160][ T5826] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 78.546133][ T5826] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 78.554168][ T5826] Kernel panic - not syncing: Fatal exception [ 78.560589][ T5826] Kernel Offset: disabled [ 78.564935][ T5826] Rebooting in 86400 seconds..