./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3933111010 <...> Warning: Permanently added '10.128.0.102' (ED25519) to the list of known hosts. execve("./syz-executor3933111010", ["./syz-executor3933111010"], 0x7ffe86f22120 /* 10 vars */) = 0 brk(NULL) = 0x5555812bb000 brk(0x5555812bbe00) = 0x5555812bbe00 arch_prctl(ARCH_SET_FS, 0x5555812bb480) = 0 set_tid_address(0x5555812bb750) = 290 set_robust_list(0x5555812bb760, 24) = 0 rseq(0x5555812bbda0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3933111010", 4096) = 28 getrandom("\x33\x2d\xd5\xf6\x31\x95\x7f\xd1", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555812bbe00 brk(0x5555812dce00) = 0x5555812dce00 brk(0x5555812dd000) = 0x5555812dd000 mprotect(0x7f2149d0b000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 rt_sigaction(SIGRTMIN, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGSEGV, {sa_handler=0x7f2149c62de0, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f2149c6ada0}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f2149c62de0, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f2149c6ada0}, NULL, 8) = 0 mkdir("./syzkaller.f4DBPe", 0700) = 0 chmod("./syzkaller.f4DBPe", 0777) = 0 chdir("./syzkaller.f4DBPe"executing program ) = 0 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) = 0x7f2141859000 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"..., 262144) = 262144 munmap(0x7f2141859000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 close(4) = 0 mkdir("\xe9\x1f\x71\x89\x59\x1e\x92\x33\x61\x4b", 0777) = 0 [ 44.138400][ T28] audit: type=1400 audit(1747621781.077:64): avc: denied { execmem } for pid=290 comm="syz-executor393" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 44.145365][ T290] loop0: detected capacity change from 0 to 512 [ 44.158231][ T28] audit: type=1400 audit(1747621781.087:65): avc: denied { read write } for pid=290 comm="syz-executor393" name="loop0" dev="devtmpfs" ino=118 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 44.181767][ T290] EXT4-fs error (device loop0): ext4_xattr_ibody_find:2186: inode #15: comm syz-executor393: corrupted in-inode xattr [ 44.189120][ T28] audit: type=1400 audit(1747621781.087:66): avc: denied { open } for pid=290 comm="syz-executor393" path="/dev/loop0" dev="devtmpfs" ino=118 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 44.200927][ T290] EXT4-fs error (device loop0): ext4_orphan_get:1405: comm syz-executor393: couldn't read orphan inode 15 (err -117) mount("/dev/loop0", "\xe9\x1f\x71\x89\x59\x1e\x92\x33\x61\x4b", "ext4", MS_NOSYMFOLLOW|MS_NOATIME|MS_I_VERSION|0x200, ",errors=continue") = 0 openat(AT_FDCWD, "\xe9\x1f\x71\x89\x59\x1e\x92\x33\x61\x4b", O_RDONLY|O_DIRECTORY) = 3 chdir("\xe9\x1f\x71\x89\x59\x1e\x92\x33\x61\x4b") = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 chdir("./file0") = 0 openat(AT_FDCWD, "net_prio.prioidx", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 4 mkdir("./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 005) = 0 creat("./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 000) = 5 mknod("./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 000) = 0 [ 44.224728][ T28] audit: type=1400 audit(1747621781.087:67): avc: denied { ioctl } for pid=290 comm="syz-executor393" path="/dev/loop0" dev="devtmpfs" ino=118 ioctlcmd=0x4c00 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 44.237302][ T290] EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none. [ 44.262546][ T28] audit: type=1400 audit(1747621781.107:68): avc: denied { mounton } for pid=290 comm="syz-executor393" path=2F726F6F742F73797A6B616C6C65722E6634444250652FE91F7189591E9233614B dev="sda1" ino=2025 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 44.289062][ T290] ================================================================== [ 44.298631][ T28] audit: type=1400 audit(1747621781.217:69): avc: denied { mount } for pid=290 comm="syz-executor393" name="/" dev="loop0" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1 [ 44.306115][ T290] BUG: KASAN: use-after-free in ext4_insert_dentry+0x388/0x710 [ 44.327969][ T28] audit: type=1400 audit(1747621781.227:70): avc: denied { write } for pid=290 comm="syz-executor393" name="file0" dev="loop0" ino=12 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 44.335373][ T290] Write of size 251 at addr ffff888124eebf14 by task syz-executor393/290 [ 44.335388][ T290] [ 44.335393][ T290] CPU: 0 PID: 290 Comm: syz-executor393 Not tainted 6.1.134-syzkaller-00016-ga0fa2316cce1 #0 [ 44.357700][ T28] audit: type=1400 audit(1747621781.227:71): avc: denied { add_name } for pid=290 comm="syz-executor393" name="net_prio.prioidx" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=1 [ 44.365943][ T290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 [ 44.365958][ T290] Call Trace: [ 44.365963][ T290] [ 44.365969][ T290] __dump_stack+0x21/0x24 [ 44.365991][ T290] dump_stack_lvl+0xee/0x150 [ 44.368868][ T28] audit: type=1400 audit(1747621781.227:72): avc: denied { create } for pid=290 comm="syz-executor393" name="net_prio.prioidx" scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:unlabeled_t tclass=file permissive=1 [ 44.378410][ T290] ? __cfi_dump_stack_lvl+0x8/0x8 [ 44.378433][ T290] ? __cfi__printk+0x8/0x8 [ 44.455854][ T290] ? ext4_insert_dentry+0x388/0x710 [ 44.461033][ T290] print_address_description+0x71/0x210 [ 44.466558][ T290] print_report+0x4a/0x60 [ 44.470861][ T290] kasan_report+0x122/0x150 [ 44.475338][ T290] ? ext4_insert_dentry+0x388/0x710 [ 44.480512][ T290] ? ext4_insert_dentry+0x388/0x710 [ 44.485684][ T290] kasan_check_range+0x280/0x290 [ 44.490599][ T290] memcpy+0x44/0x70 [ 44.494385][ T290] ext4_insert_dentry+0x388/0x710 [ 44.499384][ T290] add_dirent_to_buf+0x2ac/0x670 [ 44.504298][ T290] make_indexed_dir+0xe55/0x14a0 [ 44.509220][ T290] ? add_dirent_to_buf+0x670/0x670 [ 44.514319][ T290] ? add_dirent_to_buf+0x45b/0x670 [ 44.519415][ T290] ext4_add_entry+0xb45/0xd70 [ 44.524082][ T290] ? ext4_inc_count+0x1b0/0x1b0 [ 44.528915][ T290] ? __cfi___ext4_new_inode+0x10/0x10 [ 44.534270][ T290] ? dquot_initialize+0x20/0x20 [ 44.539100][ T290] ext4_add_nondir+0x97/0x270 [ 44.543756][ T290] ext4_symlink+0x842/0x9b0 [ 44.548236][ T290] ? __cfi_ext4_symlink+0x10/0x10 [ 44.553237][ T290] ? security_inode_symlink+0xcf/0x120 [ 44.558678][ T290] vfs_symlink+0x261/0x3f0 [ 44.563070][ T290] do_symlinkat+0x124/0x5a0 [ 44.567546][ T290] __x64_sys_symlink+0x7e/0x90 [ 44.572287][ T290] x64_sys_call+0x369/0x9a0 [ 44.576767][ T290] do_syscall_64+0x4c/0xa0 [ 44.581163][ T290] ? clear_bhb_loop+0x15/0x70 [ 44.585813][ T290] ? clear_bhb_loop+0x15/0x70 [ 44.590465][ T290] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 44.596336][ T290] RIP: 0033:0x7f2149c96e19 [ 44.600735][ T290] 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 [ 44.620313][ T290] RSP: 002b:00007fff367c8d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 [ 44.628701][ T290] RAX: ffffffffffffffda RBX: 33921e5989711fe9 RCX: 00007f2149c96e19 [ 44.636646][ T290] RDX: 0000000000000000 RSI: 0000200000000cc0 RDI: 0000200000000dc0 [ 44.644590][ T290] RBP: 00007fff367c8d48 R08: 6c616b7a79732f2e R09: 6c616b7a79732f2e [ 44.652539][ T290] R10: 6c616b7a79732f2e R11: 0000000000000246 R12: 0000000000000000 [ 44.660485][ T290] R13: 00007fff367c8fa8 R14: 0000000000000001 R15: 0000000000000001 [ 44.668434][ T290] [ 44.671428][ T290] [ 44.673726][ T290] The buggy address belongs to the physical page: [ 44.680107][ T290] page:ffffea000493bac0 refcount:3 mapcount:0 mapping:ffff88810bd814d0 index:0x3f pfn:0x124eeb [ 44.690412][ T290] memcg:ffff888100332000 [ 44.694625][ T290] aops:def_blk_aops ino:700000 [ 44.699380][ T290] flags: 0x420000000000204a(referenced|dirty|workingset|private|zone=1) [ 44.707698][ T290] raw: 420000000000204a 0000000000000000 dead000000000122 ffff88810bd814d0 [ 44.716268][ T290] raw: 000000000000003f ffff88810bd67d20 00000003ffffffff ffff888100332000 [ 44.724819][ T290] page dumped because: kasan: bad access detected [ 44.731211][ T290] page_owner tracks the page as allocated [ 44.736897][ T290] page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 290, tgid 290 (syz-executor393), ts 44288945803, free_ts 44277185732 [ 44.757275][ T290] post_alloc_hook+0x1f5/0x210 [ 44.762023][ T290] prep_new_page+0x1c/0x110 [ 44.766502][ T290] get_page_from_freelist+0x2c6e/0x2ce0 [ 44.772023][ T290] __alloc_pages+0x19e/0x3a0 [ 44.776587][ T290] __folio_alloc+0x12/0x40 [ 44.780977][ T290] __filemap_get_folio+0x6ec/0x980 [ 44.786069][ T290] pagecache_get_page+0x2b/0x110 [ 44.790980][ T290] __getblk_gfp+0x217/0x7d0 [ 44.795454][ T290] ext4_getblk+0x26c/0x6d0 [ 44.799841][ T290] ext4_bread+0x2b/0x170 [ 44.804052][ T290] ext4_append+0x2c3/0x560 [ 44.808439][ T290] make_indexed_dir+0x55d/0x14a0 [ 44.813351][ T290] ext4_add_entry+0xb45/0xd70 [ 44.818002][ T290] ext4_add_nondir+0x97/0x270 [ 44.822653][ T290] ext4_symlink+0x842/0x9b0 [ 44.827128][ T290] vfs_symlink+0x261/0x3f0 [ 44.831519][ T290] page last free stack trace: [ 44.836160][ T290] free_unref_page_prepare+0x742/0x750 [ 44.841592][ T290] free_unref_page_list+0xba/0x7c0 [ 44.846680][ T290] release_pages+0xad1/0xb20 [ 44.851250][ T290] free_pages_and_swap_cache+0x86/0xa0 [ 44.856681][ T290] tlb_finish_mmu+0x1aa/0x370 [ 44.861335][ T290] unmap_region+0x28d/0x2e0 [ 44.865813][ T290] do_mas_align_munmap+0xb94/0x11b0 [ 44.870983][ T290] do_mas_munmap+0x241/0x2b0 [ 44.875551][ T290] __vm_munmap+0x19f/0x2f0 [ 44.879941][ T290] __x64_sys_munmap+0x6b/0x80 [ 44.884590][ T290] x64_sys_call+0x8a/0x9a0 [ 44.888981][ T290] do_syscall_64+0x4c/0xa0 [ 44.893383][ T290] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 44.899269][ T290] [ 44.901570][ T290] Memory state around the buggy address: [ 44.907175][ T290] ffff888124eebf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 44.915213][ T290] ffff888124eebf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 44.923252][ T290] >ffff888124eec000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.931283][ T290] ^ symlink("./file0", "./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa") = 0 [ 44.935326][ T290] ffff888124eec080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.943358][ T290] ffff888124eec100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.951389][ T290] ================================================================== [ 44.959638][ T290] Disabling lock debugging due to kernel taint exit_group(0) = ? +++ exited with 0 +++ [ 44.965855][ T28] audit: type=1400 audit(1747621781.227:73): avc: denied { read append open } for pid=290 comm="syz-executor393" path=2F726F6F742F73797A6B616C6C65722E6634444250652FE91F7189591E9233614B2F66696C65302F6E65745F7072696F2E7072696F696478 dev="loop0" ino=18 scontext=root:sysadm_r:sysadm_t t