./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1566609513 <...> forked to background, child pid 4640 no interfaces have a carrier [ 28.005899][ T4641] 8021q: adding VLAN 0 to HW filter on device bond0 [ 28.018549][ T4641] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.176' (ECDSA) to the list of known hosts. execve("./syz-executor1566609513", ["./syz-executor1566609513"], 0x7ffed6779aa0 /* 10 vars */) = 0 brk(NULL) = 0x55555732f000 brk(0x55555732fc40) = 0x55555732fc40 arch_prctl(ARCH_SET_FS, 0x55555732f300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor1566609513", 4096) = 28 brk(0x555557350c40) = 0x555557350c40 brk(0x555557351000) = 0x555557351000 mprotect(0x7ff3efee5000, 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 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff3e7a2c000 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"..., 524288) = 524288 munmap(0x7ff3e7a2c000, 524288) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 mkdir("./file1", 0777) = 0 mount("/dev/loop0", "./file1", "hfsplus", MS_POSIXACL|MS_LAZYTIME, "") = 0 openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3 chdir("./file1") = 0 ioctl(4, LOOP_CLR_FD) = 0 close(4) = 0 syzkaller login: [ 52.659099][ T5069] loop0: detected capacity change from 0 to 1024 [ 52.683757][ T5069] hfsplus: xattr search failed [ 52.689324][ T5069] [ 52.691659][ T5069] ============================================ [ 52.697817][ T5069] WARNING: possible recursive locking detected [ 52.703956][ T5069] 6.1.0-syzkaller-14127-gec34c2b4ec38 #0 Not tainted [ 52.710608][ T5069] -------------------------------------------- [ 52.716730][ T5069] syz-executor156/5069 is trying to acquire lock: [ 52.723123][ T5069] ffff888076569548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x27b/0x9b0 [ 52.733923][ T5069] [ 52.733923][ T5069] but task is already holding lock: [ 52.741268][ T5069] ffff88807656a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 52.752657][ T5069] [ 52.752657][ T5069] other info that might help us debug this: [ 52.760697][ T5069] Possible unsafe locking scenario: [ 52.760697][ T5069] [ 52.768126][ T5069] CPU0 [ 52.771388][ T5069] ---- [ 52.774647][ T5069] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.780438][ T5069] lock(&HFSPLUS_I(inode)->extents_lock); [ 52.786226][ T5069] [ 52.786226][ T5069] *** DEADLOCK *** [ 52.786226][ T5069] [ 52.794349][ T5069] May be due to missing lock nesting notation [ 52.794349][ T5069] [ 52.802649][ T5069] 6 locks held by syz-executor156/5069: [ 52.808175][ T5069] #0: ffff88801ed20460 (sb_writers#9){.+.+}-{0:0}, at: do_unlinkat+0x183/0x640 [ 52.817238][ T5069] #1: ffff888076569e00 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: do_unlinkat+0x270/0x640 [ 52.827515][ T5069] #2: ffff88807656ab80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: vfs_unlink+0xd9/0x930 [ 52.837689][ T5069] #3: ffff88802989a198 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_unlink+0x151/0x830 [ 52.847171][ T5069] #4: ffff88807656a988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x205/0x10d0 [ 52.858818][ T5069] #5: ffff88802989a0f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xdd/0x500 [ 52.868814][ T5069] [ 52.868814][ T5069] stack backtrace: [ 52.874689][ T5069] CPU: 1 PID: 5069 Comm: syz-executor156 Not tainted 6.1.0-syzkaller-14127-gec34c2b4ec38 #0 [ 52.884742][ T5069] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 52.894791][ T5069] Call Trace: [ 52.898055][ T5069] [ 52.900972][ T5069] dump_stack_lvl+0xd1/0x138 [ 52.905558][ T5069] __lock_acquire.cold+0x116/0x3a7 [ 52.910660][ T5069] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 52.916628][ T5069] ? save_trace+0x43/0xad0 [ 52.921043][ T5069] lock_acquire+0x1e3/0x630 [ 52.925533][ T5069] ? hfsplus_get_block+0x27b/0x9b0 [ 52.930638][ T5069] ? lock_release+0x810/0x810 [ 52.935302][ T5069] __mutex_lock+0x12f/0x1360 [ 52.939909][ T5069] ? hfsplus_get_block+0x27b/0x9b0 [ 52.945013][ T5069] ? hfsplus_get_block+0x27b/0x9b0 [ 52.950117][ T5069] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 52.955662][ T5069] ? find_held_lock+0x2d/0x110 [ 52.960420][ T5069] ? create_page_buffers+0x440/0x640 [ 52.965693][ T5069] ? lock_downgrade+0x6e0/0x6e0 [ 52.970532][ T5069] hfsplus_get_block+0x27b/0x9b0 [ 52.975463][ T5069] block_read_full_folio+0x35b/0x9d0 [ 52.980736][ T5069] ? hfsplus_file_extend+0xf60/0xf60 [ 52.986015][ T5069] ? create_page_buffers+0x640/0x640 [ 52.991294][ T5069] ? perf_trace_mm_lru_insertion+0xae0/0xae0 [ 52.997264][ T5069] ? folio_add_lru+0x37b/0x680 [ 53.002020][ T5069] ? hfsplus_bmap+0x30/0x30 [ 53.006509][ T5069] filemap_read_folio+0xdb/0x2c0 [ 53.011438][ T5069] ? __folio_lock_killable+0x20/0x20 [ 53.016713][ T5069] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 53.022345][ T5069] ? __mutex_lock+0x231/0x1360 [ 53.027103][ T5069] do_read_cache_folio+0x1df/0x510 [ 53.032207][ T5069] ? hfsplus_bmap+0x30/0x30 [ 53.036701][ T5069] read_cache_page+0x5d/0x160 [ 53.041368][ T5069] hfsplus_block_free+0x13d/0x500 [ 53.046389][ T5069] ? hfsplus_find_init+0x95/0x230 [ 53.051407][ T5069] hfsplus_free_extents+0x1ff/0x4f0 [ 53.056597][ T5069] hfsplus_file_truncate+0xe36/0x10d0 [ 53.061962][ T5069] ? hfsplus_find_exit+0x79/0xc0 [ 53.066893][ T5069] ? hfsplus_get_block+0x9b0/0x9b0 [ 53.071998][ T5069] ? mutex_lock_io_nested+0x11a0/0x11a0 [ 53.077562][ T5069] hfsplus_delete_inode+0x191/0x220 [ 53.082772][ T5069] hfsplus_unlink+0x5a6/0x830 [ 53.087440][ T5069] ? hfsplus_symlink+0x2e0/0x2e0 [ 53.092369][ T5069] ? down_write+0x157/0x220 [ 53.096867][ T5069] ? down_write_killable+0x250/0x250 [ 53.102149][ T5069] vfs_unlink+0x355/0x930 [ 53.106469][ T5069] ? bpf_lsm_path_unlink+0x9/0x10 [ 53.111487][ T5069] do_unlinkat+0x3b7/0x640 [ 53.115895][ T5069] ? __ia32_sys_rmdir+0x110/0x110 [ 53.120910][ T5069] ? __check_object_size+0x2e2/0x5a0 [ 53.126189][ T5069] ? getname_flags.part.0+0x1dd/0x4f0 [ 53.131552][ T5069] __x64_sys_unlink+0xca/0x110 [ 53.136307][ T5069] do_syscall_64+0x39/0xb0 [ 53.140716][ T5069] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 53.146610][ T5069] RIP: 0033:0x7ff3efe78759 [ 53.151009][ T5069] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 [ 53.170605][ T5069] RSP: 002b:00007fff13f55828 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 [ 53.179002][ T5069] RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007ff3efe78759 [ 53.186960][ T5069] RDX: 00007ff3efe36dd3 RSI: 0000000000000000 RDI: 00000000200000c0 [ 53.194915][ T5069] RBP: 00007ff3efe37ff0 R08: 00000000000005cd R09: 0000000000000000 [ 53.202872][ T5069] R10: 00007fff13f556f0 R11: 0000000000000246 R12: 00007ff3efe38080 unlink("./file1") = 0 exit_group(0) = ? +++ exited with 0 +++ [ 53.2