loop6: detected capacity change from 0 to 32768 ocfs2: Mounting device (7,6) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc7-syzkaller #0 Not tainted ------------------------------------------------------ syz.6.2412/15246 is trying to acquire lock: ffff88801b4751e0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault mm/memory.c:7151 [inline] ffff88801b4751e0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xe3/0x190 mm/memory.c:7145 but task is already holding lock: ffff888054d8cda0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_fiemap+0x2c7/0xd00 fs/ocfs2/extent_map.c:765 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x309/0xd70 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x174/0x380 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:197 [inline] _copy_to_user+0xb6/0xd0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] bpf_verifier_vlog+0x3da/0x6f0 kernel/bpf/log.c:137 btf_verifier_log+0x16b/0x180 kernel/bpf/btf.c:1426 btf_parse_hdr kernel/bpf/btf.c:5504 [inline] btf_parse kernel/bpf/btf.c:5801 [inline] btf_new_fd+0x4132/0x53a0 kernel/bpf/btf.c:7980 bpf_btf_load kernel/bpf/syscall.c:5141 [inline] __sys_bpf+0x1adb/0x4d80 kernel/bpf/syscall.c:5879 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5939 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_pagefaults#3){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_pagefault include/linux/fs.h:1948 [inline] ocfs2_page_mkwrite+0x1cf/0xd70 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x174/0x380 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160 handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:197 [inline] _copy_to_user+0xb6/0xd0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] bpf_verifier_vlog+0x3da/0x6f0 kernel/bpf/log.c:137 btf_verifier_log+0x16b/0x180 kernel/bpf/btf.c:1426 btf_parse_hdr kernel/bpf/btf.c:5504 [inline] btf_parse kernel/bpf/btf.c:5801 [inline] btf_new_fd+0x4132/0x53a0 kernel/bpf/btf.c:7980 bpf_btf_load kernel/bpf/syscall.c:5141 [inline] __sys_bpf+0x1adb/0x4d80 kernel/bpf/syscall.c:5879 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5939 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __might_fault mm/memory.c:7151 [inline] __might_fault+0x113/0x190 mm/memory.c:7145 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2d/0xd0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x239/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x67a/0xd00 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x404/0x1990 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x11d/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &mm->mmap_lock --> sb_pagefaults#3 --> &ocfs2_file_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&ocfs2_file_ip_alloc_sem_key); lock(sb_pagefaults#3); lock(&ocfs2_file_ip_alloc_sem_key); rlock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.6.2412/15246: #0: ffff888054d8cda0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_fiemap+0x2c7/0xd00 fs/ocfs2/extent_map.c:765 stack backtrace: CPU: 0 UID: 0 PID: 15246 Comm: syz.6.2412 Not tainted 6.15.0-rc7-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __might_fault mm/memory.c:7151 [inline] __might_fault+0x113/0x190 mm/memory.c:7145 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2d/0xd0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x239/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x67a/0xd00 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x404/0x1990 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x11d/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f08c078e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f08c160b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f08c09b5fa0 RCX: 00007f08c078e969 RDX: 0000200000000180 RSI: 00000000c020660b RDI: 0000000000000004 RBP: 00007f08c0810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f08c09b5fa0 R15: 00007ffd7424ed68