./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1635981510 <...> Warning: Permanently added '10.128.1.155' (ED25519) to the list of known hosts. execve("./syz-executor1635981510", ["./syz-executor1635981510"], 0x7ffcad1a1ff0 /* 10 vars */) = 0 brk(NULL) = 0x555560e21000 brk(0x555560e21d00) = 0x555560e21d00 arch_prctl(ARCH_SET_FS, 0x555560e21380) = 0 set_tid_address(0x555560e21650) = 5189 set_robust_list(0x555560e21660, 24) = 0 rseq(0x555560e21ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1635981510", 4096) = 28 getrandom("\x93\x12\x22\x4e\x6c\xff\x17\xed", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555560e21d00 brk(0x555560e42d00) = 0x555560e42d00 brk(0x555560e43000) = 0x555560e43000 mprotect(0x7fdd83c84000, 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=0x555560e21650) = 5190 ./strace-static-x86_64: Process 5190 attached [pid 5190] set_robust_list(0x555560e21660, 24) = 0 [pid 5190] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5190] setpgid(0, 0) = 0 [pid 5190] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 executing program [pid 5190] write(3, "1000", 4) = 4 [pid 5190] close(3) = 0 [pid 5190] write(1, "executing program\n", 18) = 18 [pid 5190] memfd_create("syzkaller", 0) = 3 [pid 5190] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fdd7b600000 [pid 5190] 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\x00\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 5190] munmap(0x7fdd7b600000, 138412032) = 0 [pid 5190] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5190] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5190] close(3) = 0 [pid 5190] close(4) = 0 [pid 5190] mkdir("./file0", 0777) = 0 [ 185.847869][ T5190] loop0: detected capacity change from 0 to 256 [pid 5190] mount("/dev/loop0", "./file0", "exfat", MS_NOEXEC, "") = 0 [pid 5190] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5190] chdir("./file0") = 0 [pid 5190] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5190] chdir("./file0") = 0 [ 185.923625][ T5190] exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x726052d3, utbl_chksum : 0xe619d30d) [pid 5190] open("./bus", O_RDWR|O_CREAT|O_NONBLOCK|O_DIRECT|O_NOFOLLOW|O_NOATIME, 020) = 4 [ 185.972655][ T29] audit: type=1800 audit(1727838833.181:2): pid=5190 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed(directio) comm="syz-executor163" name="bus" dev="loop0" ino=3 res=0 errno=0 [ 185.992488][ T5190] ===================================================== [ 186.000765][ T5190] BUG: KMSAN: uninit-value in __exfat_get_dentry_set+0x10ca/0x14d0 [ 186.009027][ T5190] __exfat_get_dentry_set+0x10ca/0x14d0 [ 186.014973][ T5190] exfat_get_dentry_set+0x58/0xec0 [ 186.020328][ T5190] __exfat_write_inode+0x3c1/0xe30 [ 186.025724][ T5190] __exfat_truncate+0x7f3/0xbb0 [ 186.030757][ T5190] exfat_truncate+0xee/0x2a0 [ 186.035607][ T5190] exfat_direct_IO+0x5a3/0x900 [ 186.040529][ T5190] generic_file_direct_write+0x275/0x6a0 [ 186.046538][ T5190] __generic_file_write_iter+0x242/0x460 [ 186.052566][ T5190] exfat_file_write_iter+0x894/0xfb0 [ 186.058021][ T5190] do_iter_readv_writev+0x88a/0xa30 [ 186.063605][ T5190] vfs_writev+0x56a/0x14f0 [ 186.068194][ T5190] __se_sys_pwritev2+0x280/0x470 [ 186.073513][ T5190] __x64_sys_pwritev2+0x11f/0x1a0 [ 186.078786][ T5190] x64_sys_call+0x2edb/0x3ba0 [ 186.083772][ T5190] do_syscall_64+0xcd/0x1e0 [ 186.088526][ T5190] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 186.094809][ T5190] [ 186.097242][ T5190] Uninit was stored to memory at: [ 186.102682][ T5190] _copy_to_iter+0xe53/0x2b30 [ 186.107544][ T5190] copy_page_to_iter+0x419/0x880 [ 186.112827][ T5190] shmem_file_read_iter+0xa09/0x12b0 [ 186.118382][ T5190] do_iter_readv_writev+0x88a/0xa30 [ 186.123935][ T5190] vfs_iter_read+0x278/0x760 [ 186.128730][ T5190] loop_process_work+0x20fc/0x3750 [ 186.134148][ T5190] loop_rootcg_workfn+0x2b/0x40 [ 186.139185][ T5190] process_scheduled_works+0xae0/0x1c40 [ 186.145048][ T5190] worker_thread+0xea7/0x14f0 [ 186.149942][ T5190] kthread+0x3e2/0x540 [ 186.154285][ T5190] ret_from_fork+0x6d/0x90 [ 186.158917][ T5190] ret_from_fork_asm+0x1a/0x30 [ 186.164025][ T5190] [ 186.166447][ T5190] Uninit was stored to memory at: [ 186.172027][ T5190] copy_page_from_iter_atomic+0x12b7/0x3100 [ 186.178317][ T5190] generic_perform_write+0x8d1/0x1080 [ 186.184136][ T5190] shmem_file_write_iter+0x2ba/0x2f0 [ 186.189671][ T5190] do_iter_readv_writev+0x88a/0xa30 [ 186.195271][ T5190] vfs_iter_write+0x44d/0xd40 [ 186.200169][ T5190] loop_process_work+0x15e6/0x3750 [ 186.205590][ T5190] loop_rootcg_workfn+0x2b/0x40 [ 186.210626][ T5190] process_scheduled_works+0xae0/0x1c40 [ 186.216486][ T5190] worker_thread+0xea7/0x14f0 [ 186.221519][ T5190] kthread+0x3e2/0x540 [ 186.225827][ T5190] ret_from_fork+0x6d/0x90 [ 186.230411][ T5190] ret_from_fork_asm+0x1a/0x30 [ 186.235438][ T5190] [ 186.237877][ T5190] Uninit was created at: [ 186.242489][ T5190] __alloc_pages_noprof+0x9d6/0xe70 [ 186.247903][ T5190] alloc_pages_mpol_noprof+0x299/0x990 [ 186.253691][ T5190] folio_alloc_noprof+0x1db/0x310 [ 186.258931][ T5190] filemap_alloc_folio_noprof+0xa6/0x440 [ 186.264855][ T5190] __filemap_get_folio+0xac4/0x1550 [ 186.270270][ T5190] block_write_begin+0x6e/0x2b0 [ 186.275412][ T5190] exfat_write_begin+0xfb/0x400 [ 186.280476][ T5190] exfat_file_write_iter+0x474/0xfb0 [ 186.286047][ T5190] do_iter_readv_writev+0x88a/0xa30 [ 186.291664][ T5190] vfs_writev+0x56a/0x14f0 [ 186.296246][ T5190] __se_sys_pwritev2+0x280/0x470 [ 186.301473][ T5190] __x64_sys_pwritev2+0x11f/0x1a0 [ 186.306725][ T5190] x64_sys_call+0x2edb/0x3ba0 [ 186.311734][ T5190] do_syscall_64+0xcd/0x1e0 [ 186.316469][ T5190] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 186.322751][ T5190] [ 186.325205][ T5190] CPU: 0 UID: 0 PID: 5190 Comm: syz-executor163 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 [ 186.336587][ T5190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 186.346861][ T5190] ===================================================== [ 186.353998][ T5190] Disabling lock debugging due to kernel taint [ 186.360266][ T5190] Kernel panic - not syncing: kmsan.panic set ... [ 186.366803][ T5190] CPU: 0 UID: 0 PID: 5190 Comm: syz-executor163 Tainted: G B 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 [ 186.379536][ T5190] Tainted: [B]=BAD_PAGE [ 186.383755][ T5190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 186.393906][ T5190] Call Trace: [ 186.397296][ T5190] [ 186.400324][ T5190] dump_stack_lvl+0x216/0x2d0 [ 186.405173][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.411141][ T5190] dump_stack+0x1e/0x30 [ 186.415516][ T5190] panic+0x4e2/0xcf0 [ 186.419549][ T5190] ? kmsan_get_metadata+0x41/0x1c0 [ 186.424837][ T5190] kmsan_report+0x2c7/0x2d0 [ 186.429448][ T5190] ? kmsan_get_metadata+0x13e/0x1c0 [ 186.434747][ T5190] ? __msan_warning+0x95/0x120 [ 186.439666][ T5190] ? __exfat_get_dentry_set+0x10ca/0x14d0 [ 186.445560][ T5190] ? exfat_get_dentry_set+0x58/0xec0 [ 186.451008][ T5190] ? __exfat_write_inode+0x3c1/0xe30 [ 186.456448][ T5190] ? __exfat_truncate+0x7f3/0xbb0 [ 186.461590][ T5190] ? exfat_truncate+0xee/0x2a0 [ 186.466562][ T5190] ? exfat_direct_IO+0x5a3/0x900 [ 186.471645][ T5190] ? generic_file_direct_write+0x275/0x6a0 [ 186.477627][ T5190] ? __generic_file_write_iter+0x242/0x460 [ 186.483611][ T5190] ? exfat_file_write_iter+0x894/0xfb0 [ 186.489229][ T5190] ? do_iter_readv_writev+0x88a/0xa30 [ 186.494800][ T5190] ? vfs_writev+0x56a/0x14f0 [ 186.499534][ T5190] ? __se_sys_pwritev2+0x280/0x470 [ 186.504873][ T5190] ? __x64_sys_pwritev2+0x11f/0x1a0 [ 186.510207][ T5190] ? x64_sys_call+0x2edb/0x3ba0 [ 186.515215][ T5190] ? do_syscall_64+0xcd/0x1e0 [ 186.520118][ T5190] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 186.526807][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.532755][ T5190] ? __wait_on_bit+0x1f8/0x4b0 [ 186.537652][ T5190] ? __pfx_bit_wait_io+0x10/0x10 [ 186.542720][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.548663][ T5190] ? out_of_line_wait_on_bit+0x13c/0x170 [ 186.554434][ T5190] ? __pfx_wake_bit_function+0x10/0x10 [ 186.560022][ T5190] ? __pfx_bit_wait_io+0x10/0x10 [ 186.565092][ T5190] ? kmsan_get_metadata+0x13e/0x1c0 [ 186.570422][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.576357][ T5190] __msan_warning+0x95/0x120 [ 186.581122][ T5190] __exfat_get_dentry_set+0x10ca/0x14d0 [ 186.586941][ T5190] exfat_get_dentry_set+0x58/0xec0 [ 186.592232][ T5190] ? exfat_set_volume_dirty+0x15e/0x490 [ 186.598020][ T5190] ? kmsan_get_metadata+0x13e/0x1c0 [ 186.603358][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.609357][ T5190] __exfat_write_inode+0x3c1/0xe30 [ 186.614609][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.620551][ T5190] ? inode_needs_sync+0x130/0x2c0 [ 186.625735][ T5190] __exfat_truncate+0x7f3/0xbb0 [ 186.630724][ T5190] ? kmsan_get_shadow_origin_ptr+0x3/0xb0 [ 186.636572][ T5190] exfat_truncate+0xee/0x2a0 [ 186.641299][ T5190] exfat_direct_IO+0x5a3/0x900 [ 186.646215][ T5190] ? __pfx_exfat_direct_IO+0x10/0x10 [ 186.651642][ T5190] generic_file_direct_write+0x275/0x6a0 [ 186.657472][ T5190] __generic_file_write_iter+0x242/0x460 [ 186.663272][ T5190] exfat_file_write_iter+0x894/0xfb0 [ 186.668725][ T5190] ? __pfx_exfat_write_end+0x10/0x10 [ 186.674193][ T5190] ? __pfx_exfat_file_write_iter+0x10/0x10 [ 186.680175][ T5190] do_iter_readv_writev+0x88a/0xa30 [ 186.685576][ T5190] ? kmsan_get_metadata+0x13e/0x1c0 [ 186.690984][ T5190] ? __pfx_exfat_file_write_iter+0x10/0x10 [ 186.696955][ T5190] ? __pfx_exfat_file_write_iter+0x10/0x10 [ 186.702964][ T5190] vfs_writev+0x56a/0x14f0 [ 186.707523][ T5190] ? kmsan_get_metadata+0x13e/0x1c0 [ 186.712934][ T5190] ? __traceiter_rdev_dump_survey+0x40/0x160 [ 186.719099][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.725112][ T5190] ? kmsan_get_metadata+0x13e/0x1c0 [ 186.730455][ T5190] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 186.736461][ T5190] __se_sys_pwritev2+0x280/0x470 [ 186.741562][ T5190] __x64_sys_pwritev2+0x11f/0x1a0 [ 186.746750][ T5190] x64_sys_call+0x2edb/0x3ba0 [ 186.751578][ T5190] do_syscall_64+0xcd/0x1e0 [ 186.756219][ T5190] ? clear_bhb_loop+0x25/0x80 [ 186.761053][ T5190] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 186.767309][ T5190] RIP: 0033:0x7fdd83c0fad9 [ 186.771885][ T5190] 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 [ 186.791642][ T5190] RSP: 002b:00007fffe3865d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 [ 186.800233][ T5190] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fdd83c0fad9 [ 186.808395][ T5190] RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000004 [ 186.816467][ T5190] RBP: 00007fdd83c845f0 R08: 0000000000000000 R09: 0000000000000000 [ 186.824562][ T5190] R10: 0000000000000030 R11: 0000000000000246 R12: 00007fffe3865db0 [ 186.832721][ T5190] R13: 00007fffe3865fd8 R14: 431bde82d7b634db R15: 00007fdd83c5803b [ 186.840823][ T5190] [ 186.844304][ T5190] Kernel Offset: disabled [ 186.848737][ T5190] Rebooting in 86400 seconds..