./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor914539624 <...> Warning: Permanently added '10.128.1.18' (ED25519) to the list of known hosts. execve("./syz-executor914539624", ["./syz-executor914539624"], 0x7ffc17aaa810 /* 10 vars */) = 0 brk(NULL) = 0x555591cfd000 brk(0x555591cfdd00) = 0x555591cfdd00 arch_prctl(ARCH_SET_FS, 0x555591cfd380) = 0 set_tid_address(0x555591cfd650) = 5826 set_robust_list(0x555591cfd660, 24) = 0 rseq(0x555591cfdca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor914539624", 4096) = 27 getrandom("\x8a\x31\x4e\xfa\x04\x90\xbc\x57", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555591cfdd00 brk(0x555591d1ed00) = 0x555591d1ed00 brk(0x555591d1f000) = 0x555591d1f000 mprotect(0x7f82c9d7f000, 16384, PROT_READ) = 0 mmap(0x3ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3ffffffff000 mmap(0x400000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000000000 mmap(0x400001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400001000000 write(1, "executing program\n", 18executing program ) = 18 memfd_create("syzkaller", 0) = 3 mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f82c1800000 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(0x7f82c1800000, 138412032) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 ioctl(4, LOOP_SET_FD, 3) = 0 close(3) = 0 close(4) = 0 mkdir("./file1", 0777) = 0 mount("/dev/loop0", "./file1", "hfsplus", 0, "part=0x0000000000000040,nodecompose,part=0x0000000000000007,part=0x000000000000000c,uid=0x0000000000"...) = 0 openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3 chdir("./file1") = 0 [ 77.608434][ T5826] loop0: detected capacity change from 0 to 1024 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [ 77.679479][ T5826] [ 77.681844][ T5826] ============================================ [ 77.687989][ T5826] WARNING: possible recursive locking detected [ 77.694149][ T5826] 6.14.0-rc3-syzkaller-00012-g2408a807bfc3 #0 Not tainted [ 77.701255][ T5826] -------------------------------------------- [ 77.707402][ T5826] syz-executor914/5826 is trying to acquire lock: [ 77.713906][ T5826] ffff88807dd71548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x383/0x14f0 [ 77.724838][ T5826] [ 77.724838][ T5826] but task is already holding lock: [ 77.732204][ T5826] ffff88807dd72988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x30a/0xc70 [ 77.743375][ T5826] [ 77.743375][ T5826] other info that might help us debug this: [ 77.751459][ T5826] Possible unsafe locking scenario: [ 77.751459][ T5826] [ 77.758915][ T5826] CPU0 [ 77.762195][ T5826] ---- [ 77.765472][ T5826] lock(&HFSPLUS_I(inode)->extents_lock); [ 77.771290][ T5826] lock(&HFSPLUS_I(inode)->extents_lock); [ 77.777104][ T5826] [ 77.777104][ T5826] *** DEADLOCK *** [ 77.777104][ T5826] [ 77.785261][ T5826] May be due to missing lock nesting notation [ 77.785261][ T5826] [ 77.793587][ T5826] 4 locks held by syz-executor914/5826: [ 77.799131][ T5826] #0: ffff8880490b2420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 [ 77.808308][ T5826] #1: ffff88807dd72b78 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: do_truncate+0x20c/0x310 [ 77.818693][ T5826] #2: ffff88807dd72988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x30a/0xc70 [ 77.830289][ T5826] #3: ffff888027ef58f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xbb/0x4e0 [ 77.840310][ T5826] [ 77.840310][ T5826] stack backtrace: [ 77.846217][ T5826] CPU: 1 UID: 0 PID: 5826 Comm: syz-executor914 Not tainted 6.14.0-rc3-syzkaller-00012-g2408a807bfc3 #0 [ 77.846237][ T5826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 [ 77.846251][ T5826] Call Trace: [ 77.846263][ T5826] [ 77.846270][ T5826] dump_stack_lvl+0x241/0x360 [ 77.846294][ T5826] ? __pfx_dump_stack_lvl+0x10/0x10 [ 77.846310][ T5826] ? __pfx__printk+0x10/0x10 [ 77.846335][ T5826] ? lockdep_unlock+0x16a/0x300 [ 77.846361][ T5826] print_deadlock_bug+0x483/0x620 [ 77.846379][ T5826] validate_chain+0x15e2/0x5920 [ 77.846407][ T5826] ? kernel_text_address+0xa7/0xe0 [ 77.846429][ T5826] ? stack_trace_save+0x118/0x1d0 [ 77.846448][ T5826] ? __pfx_validate_chain+0x10/0x10 [ 77.846464][ T5826] ? __pfx_stack_trace_save+0x10/0x10 [ 77.846481][ T5826] ? check_noncircular+0x259/0x4a0 [ 77.846499][ T5826] ? __pfx_check_noncircular+0x10/0x10 [ 77.846516][ T5826] ? lockdep_unlock+0x16a/0x300 [ 77.846536][ T5826] ? look_up_lock_class+0x77/0x170 [ 77.846561][ T5826] ? register_lock_class+0x102/0x980 [ 77.846587][ T5826] ? add_lock_to_list+0x1e8/0x2f0 [ 77.846604][ T5826] ? __pfx_register_lock_class+0x10/0x10 [ 77.846626][ T5826] ? validate_chain+0x15c0/0x5920 [ 77.846640][ T5826] ? is_bpf_text_address+0x26/0x2a0 [ 77.846666][ T5826] ? mark_lock+0x9a/0x360 [ 77.846690][ T5826] __lock_acquire+0x1397/0x2100 [ 77.846718][ T5826] lock_acquire+0x1ed/0x550 [ 77.846740][ T5826] ? hfsplus_get_block+0x383/0x14f0 [ 77.846764][ T5826] ? __pfx_lock_acquire+0x10/0x10 [ 77.846787][ T5826] ? __pfx___might_resched+0x10/0x10 [ 77.846806][ T5826] ? register_lock_class+0x102/0x980 [ 77.846849][ T5826] ? create_empty_buffers+0x3a/0x530 [ 77.846866][ T5826] ? __pfx_register_lock_class+0x10/0x10 [ 77.846888][ T5826] ? read_cache_page+0x5b/0x170 [ 77.846914][ T5826] ? hfsplus_free_extents+0x49e/0xae0 [ 77.846951][ T5826] __mutex_lock+0x19c/0x1010 [ 77.846970][ T5826] ? hfsplus_get_block+0x383/0x14f0 [ 77.846993][ T5826] ? __lock_acquire+0x1397/0x2100 [ 77.847017][ T5826] ? hfsplus_get_block+0x383/0x14f0 [ 77.847039][ T5826] ? __pfx___mutex_lock+0x10/0x10 [ 77.847065][ T5826] hfsplus_get_block+0x383/0x14f0 [ 77.847091][ T5826] ? __pfx_hfsplus_get_block+0x10/0x10 [ 77.847115][ T5826] ? _raw_spin_unlock+0x28/0x50 [ 77.847131][ T5826] ? create_empty_buffers+0x471/0x530 [ 77.847149][ T5826] block_read_full_folio+0x3ee/0xae0 [ 77.847171][ T5826] ? __pfx_hfsplus_get_block+0x10/0x10 [ 77.847197][ T5826] ? __pfx_block_read_full_folio+0x10/0x10 [ 77.847219][ T5826] ? folio_add_lru+0x187/0x230 [ 77.847244][ T5826] filemap_read_folio+0x148/0x3b0 [ 77.847268][ T5826] ? __pfx_hfsplus_read_folio+0x10/0x10 [ 77.847289][ T5826] ? __pfx_filemap_read_folio+0x10/0x10 [ 77.847312][ T5826] ? __filemap_get_folio+0x9a8/0xae0 [ 77.847337][ T5826] do_read_cache_folio+0x373/0x5b0 [ 77.847362][ T5826] ? __pfx_hfsplus_read_folio+0x10/0x10 [ 77.847382][ T5826] ? __mutex_unlock_slowpath+0x227/0x800 [ 77.847404][ T5826] read_cache_page+0x5b/0x170 [ 77.847429][ T5826] hfsplus_block_free+0x128/0x4e0 [ 77.847447][ T5826] ? rcu_is_watching+0x15/0xb0 [ 77.847465][ T5826] hfsplus_free_extents+0x49e/0xae0 [ 77.847488][ T5826] ? hfsplus_find_init+0x14a/0x1c0 [ 77.847505][ T5826] hfsplus_file_truncate+0x86c/0xc70 [ 77.847531][ T5826] ? __pfx___up_read+0x10/0x10 [ 77.847548][ T5826] ? __pfx_hfsplus_file_truncate+0x10/0x10 [ 77.847578][ T5826] ? unmap_mapping_range+0xf8/0x290 [ 77.847595][ T5826] ? __pfx_unmap_mapping_range+0x10/0x10 [ 77.847611][ T5826] ? current_time+0x29b/0x3a0 [ 77.847630][ T5826] ? truncate_setsize+0xcf/0xf0 [ 77.847647][ T5826] hfsplus_setattr+0x1bd/0x270 [ 77.847668][ T5826] ? __pfx_hfsplus_setattr+0x10/0x10 [ 77.847690][ T5826] notify_change+0xbca/0xe90 [ 77.847716][ T5826] do_truncate+0x220/0x310 [ 77.847737][ T5826] ? __pfx_do_truncate+0x10/0x10 [ 77.847755][ T5826] ? rcu_read_lock_any_held+0xb7/0x160 [ 77.847776][ T5826] ? mnt_get_write_access+0x226/0x2b0 [ 77.847796][ T5826] ? bpf_lsm_path_truncate+0x9/0x10 [ 77.847813][ T5826] vfs_truncate+0x492/0x530 [ 77.847836][ T5826] ? __pfx_vfs_truncate+0x10/0x10 [ 77.847855][ T5826] ? kmem_cache_free+0x195/0x410 [ 77.847870][ T5826] ? user_path_at+0x44/0x60 [ 77.847892][ T5826] do_sys_truncate+0xdb/0x190 [ 77.847911][ T5826] ? __pfx_do_sys_truncate+0x10/0x10 [ 77.847932][ T5826] ? do_syscall_64+0x100/0x230 [ 77.847955][ T5826] do_syscall_64+0xf3/0x230 [ 77.847975][ T5826] ? clear_bhb_loop+0x35/0x90 [ 77.847999][ T5826] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.848022][ T5826] RIP: 0033:0x7f82c9d0ba39 [ 77.848041][ 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 [ 77.848055][ T5826] RSP: 002b:00007ffc73a9b178 EFLAGS: 00000246 ORIG_RAX: 000000000000004c [ 77.848071][ T5826] RAX: ffffffffffffffda RBX: 00007f82c9d5405e RCX: 00007f82c9d0ba39 [ 77.848082][ T5826] RDX: 00007f82c9d0aad1 RSI: 0000000000000209 RDI: 0000400000000180 truncate("./file2", 521) = 0 exit_group(0) = ? +++ exited with 0 +++ [ 77.848093][ T5826] RBP: 00007f82c9d7f