ocfs2: Mounting device (7,4) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc4-syzkaller-00085-g4e46774408d9 #0 Not tainted ------------------------------------------------------ syz.4.336/7944 is trying to acquire lock: ffff88805c0c8660 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x346/0xed0 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff888075534518 (sb_pagefaults#12){.+.+}-{0:0}, at: do_page_mkwrite+0x198/0x480 mm/memory.c:3162 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#12){.+.+}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1716 [inline] sb_start_pagefault include/linux/fs.h:1881 [inline] ocfs2_page_mkwrite+0x222/0xed0 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5362 [inline] do_fault mm/memory.c:5424 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5755 __handle_mm_fault mm/memory.c:5898 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6066 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x257/0x1d60 lib/iov_iter.c:185 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:189 [inline] filemap_read+0x7f3/0xf90 mm/filemap.c:2696 ocfs2_file_read_iter+0x4a5/0xb70 fs/ocfs2/file.c:2577 new_sync_read fs/read_write.c:488 [inline] vfs_read+0x9bb/0xbc0 fs/read_write.c:569 ksys_read+0x183/0x2b0 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 ( &mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __might_fault+0xc6/0x120 mm/memory.c:6705 _inline_copy_to_user include/linux/uaccess.h:183 [inline] _copy_to_user+0x2a/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline] ocfs2_fiemap+0xc25/0xf80 fs/ocfs2/extent_map.c:762 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1bf8/0x2e40 fs/ioctl.c:841 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x346/0xed0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5362 [inline] do_fault mm/memory.c:5424 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5755 __handle_mm_fault mm/memory.c:5898 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6066 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x257/0x1d60 lib/iov_iter.c:185 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:189 [inline] filemap_read+0x7f3/0xf90 mm/filemap.c:2696 ocfs2_file_read_iter+0x4a5/0xb70 fs/ocfs2/file.c:2577 new_sync_read fs/read_write.c:488 [inline] vfs_read+0x9bb/0xbc0 fs/read_write.c:569 ksys_read+0x183/0x2b0 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &ocfs2_file_ip_alloc_sem_key --> &mm->mmap_lock --> sb_pagefaults#12 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#12); lock(&mm->mmap_lock); lock(sb_pagefaults#12); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 3 locks held by syz.4.336/7944: #0: ffff88804ec9f978 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160 #1: ffff88807cf28198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #1: ffff88807cf28198 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6103 [inline] #1: ffff88807cf28198 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6163 #2: ffff888075534518 (sb_pagefaults#12){.+.+}-{0:0}, at: do_page_mkwrite+0x198/0x480 mm/memory.c:3162 stack backtrace: CPU: 0 UID: 0 PID: 7944 Comm: syz.4.336 Not tainted 6.12.0-rc4-syzkaller-00085-g4e46774408d9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x346/0xed0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5362 [inline] do_fault mm/memory.c:5424 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5755 __handle_mm_fault mm/memory.c:5898 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6066 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1 RSP: 0018:ffffc90009fbf6d8 EFLAGS: 00050206 RAX: ffffffff84b1fc01 RBX: 0000000020009cc0 RCX: 0000000000001000 RDX: 0000000000000000 RSI: ffff8880613ca000 RDI: 0000000020009cc0 RBP: ffffc90009fbf858 R08: ffff8880613cafff R09: 1ffff1100c2795ff R10: dffffc0000000000 R11: ffffed100c279600 R12: 0000000000001000 R13: ffff8880613ca000 R14: ffffc90009fbfd98 R15: 1ffff920013f7fb3 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0x257/0x1d60 lib/iov_iter.c:185 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:189 [inline] filemap_read+0x7f3/0xf90 mm/filemap.c:2696 ocfs2_file_read_iter+0x4a5/0xb70 fs/ocfs2/file.c:2577 new_sync_read fs/read_write.c:488 [inline] vfs_read+0x9bb/0xbc0 fs/read_write.c:569 ksys_read+0x183/0x2b0 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb54937e719 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:00007fb54a263038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fb549535f80 RCX: 00007fb54937e719 RDX: 0000000000002020 RSI: 0000000020009cc0 RDI: 0000000000000004 RBP: 00007fb5493f12be R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb549535f80 R15: 00007ffcc4462e88 ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) e: 00 00 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 48 89 c8 mov %rcx,%rax 34: 48 c1 e9 03 shr $0x3,%rcx 38: 83 e0 07 and $0x7,%eax 3b: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) 3e: 89 c1 mov %eax,%ecx