./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor40608382 <...> Warning: Permanently added '10.128.0.154' (ED25519) to the list of known hosts. execve("./syz-executor40608382", ["./syz-executor40608382"], 0x7ffc8b590af0 /* 10 vars */) = 0 brk(NULL) = 0x55558e1fc000 brk(0x55558e1fcd00) = 0x55558e1fcd00 arch_prctl(ARCH_SET_FS, 0x55558e1fc380) = 0 set_tid_address(0x55558e1fc650) = 5183 set_robust_list(0x55558e1fc660, 24) = 0 rseq(0x55558e1fcca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor40608382", 4096) = 26 getrandom("\x0e\x36\xfa\x02\x3a\x74\xe3\x37", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558e1fcd00 brk(0x55558e21dd00) = 0x55558e21dd00 brk(0x55558e21e000) = 0x55558e21e000 mprotect(0x7f7b256c8000, 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 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address) close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558e1fc650) = 5184 ./strace-static-x86_64: Process 5184 attached [pid 5184] set_robust_list(0x55558e1fc660, 24) = 0 [pid 5184] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5184] setpgid(0, 0) = 0 [pid 5184] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5184] write(3, "1000", 4) = 4 executing program [pid 5184] close(3) = 0 [pid 5184] write(1, "executing program\n", 18) = 18 [pid 5184] memfd_create("syzkaller", 0) = 3 [pid 5184] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7b1d200000 [pid 5184] write(3, "\xeb\x76\x90\x45\x58\x46\x41\x54\x20\x20\x20\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\x03\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x08\x00\x00\x00\x88\x00\x00\x00\x0f\x00\x00\x00\x05\x00\x00\x00"..., 131072) = 131072 [pid 5184] munmap(0x7f7b1d200000, 138412032) = 0 [pid 5184] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5184] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5184] close(3) = 0 [pid 5184] close(4) = 0 [pid 5184] mkdir("./file2", 0777) = 0 [ 165.200561][ T5184] loop0: detected capacity change from 0 to 256 [pid 5184] mount("/dev/loop0", "./file2", "exfat", MS_SYNCHRONOUS|MS_NODIRATIME, "") = 0 [pid 5184] openat(AT_FDCWD, "./file2", O_RDONLY|O_DIRECTORY) = 3 [pid 5184] chdir("./file2") = 0 [pid 5184] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5184] openat(AT_FDCWD, "memory.events", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 4 [pid 5184] openat(AT_FDCWD, "memory.events", O_WRONLY|O_TRUNC|O_NONBLOCK|O_DSYNC|O_DIRECT|FASYNC|0x4) = 5 [pid 5184] io_uring_setup(210, {flags=0, sq_thread_cpu=0, sq_thread_idle=170, sq_entries=256, cq_entries=512, features=IORING_FEAT_SINGLE_MMAP|IORING_FEAT_NODROP|IORING_FEAT_SUBMIT_STABLE|IORING_FEAT_RW_CUR_POS|IORING_FEAT_CUR_PERSONALITY|IORING_FEAT_FAST_POLL|IORING_FEAT_POLL_32BITS|IORING_FEAT_SQPOLL_NONFIXED|IORING_FEAT_EXT_ARG|IORING_FEAT_NATIVE_WORKERS|IORING_FEAT_RSRC_TAGS|IORING_FEAT_CQE_SKIP|IORING_FEAT_LINKED_FILE|0xe000, sq_off={head=0, tail=4, ring_mask=16, ring_entries=24, flags=36, dropped=32, array=8256}, cq_off={head=8, tail=12, ring_mask=20, ring_entries=28, overflow=44, cqes=64, flags=40}}) = 6 [pid 5184] mmap(NULL, 9280, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_POPULATE, 6, 0) = 0x7f7b2560c000 [pid 5184] mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_POPULATE, 6, 0x10000000) = 0x7f7b25608000 [ 165.257053][ T5184] exFAT-fs (loop0): failed to load upcase table (idx : 0x0000fd4f, chksum : 0x3963664b, utbl_chksum : 0xe619d30d) [ 165.300991][ T5184] ===================================================== [ 165.308516][ T5184] BUG: KMSAN: uninit-value in iov_iter_alignment_iovec+0x1a8/0x470 [ 165.316817][ T5184] iov_iter_alignment_iovec+0x1a8/0x470 [ 165.322560][ T5184] iov_iter_alignment+0x1ac/0x2d0 [ 165.327906][ T5184] __blockdev_direct_IO+0x170/0x6460 [ 165.333391][ T5184] exfat_direct_IO+0x191/0x900 [ 165.338479][ T5184] generic_file_direct_write+0x275/0x6a0 [ 165.344337][ T5184] __generic_file_write_iter+0x242/0x460 [ 165.350244][ T5184] exfat_file_write_iter+0x894/0xfb0 [ 165.355782][ T5184] io_write+0xbd3/0x20a0 [ 165.360133][ T5184] io_issue_sqe+0x429/0x22c0 [ 165.364818][ T5184] io_submit_sqes+0x125c/0x2f30 [ 165.369897][ T5184] __se_sys_io_uring_enter+0x406/0x41c0 [ 165.375766][ T5184] __x64_sys_io_uring_enter+0x11f/0x1a0 [ 165.381467][ T5184] x64_sys_call+0x2b54/0x3ba0 [ 165.386446][ T5184] do_syscall_64+0xcd/0x1e0 [ 165.391150][ T5184] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 165.397320][ T5184] [ 165.399720][ T5184] Uninit was created at: [ 165.404118][ T5184] __kmalloc_noprof+0x661/0xf30 [ 165.409224][ T5184] io_alloc_async_data+0xc0/0x220 [ 165.414439][ T5184] io_prep_rw+0x921/0xcd0 [ 165.419031][ T5184] io_prep_rwv+0xb3/0x4e0 [ 165.423566][ T5184] io_prep_writev+0x3a/0x50 [ 165.428407][ T5184] io_submit_sqes+0x112e/0x2f30 [ 165.433434][ T5184] __se_sys_io_uring_enter+0x406/0x41c0 [ 165.439346][ T5184] __x64_sys_io_uring_enter+0x11f/0x1a0 [ 165.445110][ T5184] x64_sys_call+0x2b54/0x3ba0 [ 165.450042][ T5184] do_syscall_64+0xcd/0x1e0 [ 165.454725][ T5184] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 165.460896][ T5184] [ 165.463321][ T5184] CPU: 0 UID: 0 PID: 5184 Comm: syz-executor406 Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0 [ 165.474721][ T5184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 165.485003][ T5184] ===================================================== [ 165.492212][ T5184] Disabling lock debugging due to kernel taint [ 165.498601][ T5184] Kernel panic - not syncing: kmsan.panic set ... [ 165.505105][ T5184] CPU: 0 UID: 0 PID: 5184 Comm: syz-executor406 Tainted: G B 6.12.0-rc3-syzkaller-00087-gc964ced77262 #0 [ 165.517823][ T5184] Tainted: [B]=BAD_PAGE [ 165.522029][ T5184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 165.532186][ T5184] Call Trace: [ 165.535543][ T5184] [ 165.538534][ T5184] dump_stack_lvl+0x216/0x2d0 [ 165.543330][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.549248][ T5184] dump_stack+0x1e/0x30 [ 165.553513][ T5184] panic+0x4e2/0xcf0 [ 165.557518][ T5184] ? kmsan_get_metadata+0xc1/0x1c0 [ 165.562741][ T5184] kmsan_report+0x2c7/0x2d0 [ 165.567377][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.573282][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.578572][ T5184] ? __msan_warning+0x95/0x120 [ 165.583454][ T5184] ? iov_iter_alignment_iovec+0x1a8/0x470 [ 165.589301][ T5184] ? iov_iter_alignment+0x1ac/0x2d0 [ 165.594616][ T5184] ? __blockdev_direct_IO+0x170/0x6460 [ 165.600198][ T5184] ? exfat_direct_IO+0x191/0x900 [ 165.605273][ T5184] ? generic_file_direct_write+0x275/0x6a0 [ 165.611295][ T5184] ? __generic_file_write_iter+0x242/0x460 [ 165.617258][ T5184] ? exfat_file_write_iter+0x894/0xfb0 [ 165.622877][ T5184] ? io_write+0xbd3/0x20a0 [ 165.627414][ T5184] ? io_issue_sqe+0x429/0x22c0 [ 165.632342][ T5184] ? io_submit_sqes+0x125c/0x2f30 [ 165.637479][ T5184] ? __se_sys_io_uring_enter+0x406/0x41c0 [ 165.643318][ T5184] ? __x64_sys_io_uring_enter+0x11f/0x1a0 [ 165.649160][ T5184] ? x64_sys_call+0x2b54/0x3ba0 [ 165.654129][ T5184] ? do_syscall_64+0xcd/0x1e0 [ 165.658928][ T5184] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 165.665147][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.671056][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.676349][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.681639][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.687546][ T5184] ? __module_address+0x4d/0x630 [ 165.692574][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.697865][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.703152][ T5184] ? kmsan_internal_set_shadow_origin+0x69/0x100 [ 165.709614][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.714910][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.720210][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.726114][ T5184] __msan_warning+0x95/0x120 [ 165.730847][ T5184] iov_iter_alignment_iovec+0x1a8/0x470 [ 165.736529][ T5184] iov_iter_alignment+0x1ac/0x2d0 [ 165.741694][ T5184] ? __blockdev_direct_IO+0x15d/0x6460 [ 165.747346][ T5184] ? exfat_direct_IO+0x191/0x900 [ 165.752416][ T5184] __blockdev_direct_IO+0x170/0x6460 [ 165.757895][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.763183][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.769098][ T5184] ? current_time+0x43/0x4f0 [ 165.773818][ T5184] ? __pfx_exfat_get_block+0x10/0x10 [ 165.779214][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.784511][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.789804][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.795716][ T5184] ? _raw_spin_unlock_irqrestore+0x3f/0x60 [ 165.801660][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.806959][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.812877][ T5184] exfat_direct_IO+0x191/0x900 [ 165.817768][ T5184] ? __pfx_exfat_direct_IO+0x10/0x10 [ 165.823170][ T5184] generic_file_direct_write+0x275/0x6a0 [ 165.828948][ T5184] __generic_file_write_iter+0x242/0x460 [ 165.834726][ T5184] exfat_file_write_iter+0x894/0xfb0 [ 165.840123][ T5184] ? security_file_permission+0x7e/0x540 [ 165.845884][ T5184] ? __pfx_exfat_file_write_iter+0x10/0x10 [ 165.851796][ T5184] ? __pfx_exfat_file_write_iter+0x10/0x10 [ 165.857709][ T5184] io_write+0xbd3/0x20a0 [ 165.862080][ T5184] ? __pfx_io_write+0x10/0x10 [ 165.866890][ T5184] io_issue_sqe+0x429/0x22c0 [ 165.871675][ T5184] io_submit_sqes+0x125c/0x2f30 [ 165.876666][ T5184] __se_sys_io_uring_enter+0x406/0x41c0 [ 165.882332][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.887627][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.892916][ T5184] ? kmsan_internal_set_shadow_origin+0x69/0x100 [ 165.899399][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.904696][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.910612][ T5184] ? kmsan_get_metadata+0x13e/0x1c0 [ 165.915925][ T5184] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 165.921843][ T5184] ? _raw_spin_unlock_irq+0x31/0x50 [ 165.927156][ T5184] __x64_sys_io_uring_enter+0x11f/0x1a0 [ 165.932835][ T5184] x64_sys_call+0x2b54/0x3ba0 [ 165.937636][ T5184] do_syscall_64+0xcd/0x1e0 [ 165.942257][ T5184] ? clear_bhb_loop+0x25/0x80 [ 165.947052][ T5184] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 165.953101][ T5184] RIP: 0033:0x7f7b25653cd9 [ 165.957624][ T5184] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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 [ 165.977424][ T5184] RSP: 002b:00007ffc51364138 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa [ 165.985957][ T5184] RAX: ffffffffffffffda RBX: 00000000000000d2 RCX: 00007f7b25653cd9 [ 165.994030][ T5184] RDX: 0000000000000000 RSI: 00000000000047ba RDI: 0000000000000006 [ 166.002085][ T5184] RBP: 0000000000000006 R08: 0000000000000000 R09: 0000000000000000 [ 166.010141][ T5184] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc51364170 [ 166.018213][ T5184] R13: 00007ffc51364398 R14: 431bde82d7b634db R15: 00007f7b2569c03b [ 166.026322][ T5184] [ 166.029620][ T5184] Kernel Offset: disabled [ 166.034025][ T5184] Rebooting in 86400 seconds..