loop9: detected capacity change from 0 to 32768 JBD2: Ignoring recovery information on journal ocfs2: Mounting device (7,9) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc1-syzkaller-00034-g92514ef226f5 #0 Not tainted ------------------------------------------------------ syz.9.3109/18969 is trying to acquire lock: ffff88807b638660 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_page_mkwrite+0x34f/0xda0 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff888026594518 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x15e/0x350 mm/memory.c:3244 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#8){.+.+}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1773 [inline] sb_start_pagefault include/linux/fs.h:1938 [inline] ocfs2_page_mkwrite+0x22c/0xda0 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x15e/0x350 mm/memory.c:3244 do_shared_fault mm/memory.c:5468 [inline] do_fault mm/memory.c:5530 [inline] do_pte_missing mm/memory.c:4047 [inline] handle_pte_fault mm/memory.c:5889 [inline] __handle_mm_fault+0x22e2/0x70f0 mm/memory.c:6032 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6201 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 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] 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+0x262/0x1c50 lib/iov_iter.c:185 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x88d/0x1260 mm/filemap.c:2742 ocfs2_file_read_iter+0x42b/0xb80 fs/ocfs2/file.c:2589 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x977/0xb40 fs/read_write.c:565 ksys_read+0x18f/0x2b0 fs/read_write.c:708 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){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __might_fault+0xc6/0x120 mm/memory.c:6840 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145 ocfs2_fiemap+0x9f1/0xf80 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1c03/0x2e40 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892 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){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x34f/0xda0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x15e/0x350 mm/memory.c:3244 do_shared_fault mm/memory.c:5468 [inline] do_fault mm/memory.c:5530 [inline] do_pte_missing mm/memory.c:4047 [inline] handle_pte_fault mm/memory.c:5889 [inline] __handle_mm_fault+0x22e2/0x70f0 mm/memory.c:6032 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6201 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 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] 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+0x262/0x1c50 lib/iov_iter.c:185 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x88d/0x1260 mm/filemap.c:2742 ocfs2_file_read_iter+0x42b/0xb80 fs/ocfs2/file.c:2589 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x977/0xb40 fs/read_write.c:565 ksys_read+0x18f/0x2b0 fs/read_write.c:708 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#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#8); lock(&mm->mmap_lock); lock(sb_pagefaults#8); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 3 locks held by syz.9.3109/18969: #0: ffff88802a510d38 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x254/0x320 fs/file.c:1192 #1: ffff8880222e01e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:209 [inline] #1: ffff8880222e01e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6238 [inline] #1: ffff8880222e01e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6298 #2: ffff888026594518 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x15e/0x350 mm/memory.c:3244 stack backtrace: CPU: 0 UID: 0 PID: 18969 Comm: syz.9.3109 Not tainted 6.14.0-rc1-syzkaller-00034-g92514ef226f5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x34f/0xda0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x15e/0x350 mm/memory.c:3244 do_shared_fault mm/memory.c:5468 [inline] do_fault mm/memory.c:5530 [inline] do_pte_missing mm/memory.c:4047 [inline] handle_pte_fault mm/memory.c:5889 [inline] __handle_mm_fault+0x22e2/0x70f0 mm/memory.c:6032 handle_mm_fault+0x3e5/0x8d0 mm/memory.c:6201 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] RIP: 0010:copy_to_user_iter lib/iov_iter.c:25 [inline] RIP: 0010:iterate_ubuf include/linux/iov_iter.h:30 [inline] RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:300 [inline] RIP: 0010:iterate_and_advance include/linux/iov_iter.h:328 [inline] RIP: 0010:_copy_to_iter+0x262/0x1c50 lib/iov_iter.c:185 Code: 53 03 00 00 e8 bf 2f d9 fc 4c 8b 7c 24 78 4c 89 ff 4c 8b 74 24 40 44 89 f6 e8 8a ca 3f fd 0f 01 cb 48 89 df 4c 89 f1 4c 89 fe a4 0f 1f 00 0f 01 ca 49 bf 00 00 00 00 00 fc ff df 49 29 ce 43 RSP: 0018:ffffc900030776e0 EFLAGS: 00050246 RAX: ffffffff84e62e01 RBX: 0000200000002280 RCX: 0000000000001000 RDX: 0000000000000000 RSI: ffff8880561d8000 RDI: 0000200000002280 RBP: ffffc90003077858 R08: ffff8880561d8fff R09: 1ffff1100ac3b1ff R10: dffffc0000000000 R11: ffffed100ac3b200 R12: 1ffff9200060efb3 R13: ffffc90003077d98 R14: 0000000000001000 R15: ffff8880561d8000 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:198 [inline] filemap_read+0x88d/0x1260 mm/filemap.c:2742 ocfs2_file_read_iter+0x42b/0xb80 fs/ocfs2/file.c:2589 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x977/0xb40 fs/read_write.c:565 ksys_read+0x18f/0x2b0 fs/read_write.c:708 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: 0033:0x7f0feab8cde9 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:00007f0feba82038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f0feada5fa0 RCX: 00007f0feab8cde9 RDX: 0000000000002020 RSI: 0000200000002280 RDI: 0000000000000004 RBP: 00007f0feac0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0feada5fa0 R15: 00007fff2f634888 ---------------- Code disassembly (best guess): 0: 53 push %rbx 1: 03 00 add (%rax),%eax 3: 00 e8 add %ch,%al 5: bf 2f d9 fc 4c mov $0x4cfcd92f,%edi a: 8b 7c 24 78 mov 0x78(%rsp),%edi e: 4c 89 ff mov %r15,%rdi 11: 4c 8b 74 24 40 mov 0x40(%rsp),%r14 16: 44 89 f6 mov %r14d,%esi 19: e8 8a ca 3f fd call 0xfd3fcaa8 1e: 0f 01 cb stac 21: 48 89 df mov %rbx,%rdi 24: 4c 89 f1 mov %r14,%rcx 27: 4c 89 fe mov %r15,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 0f 01 ca clac 32: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 39: fc ff df 3c: 49 29 ce sub %rcx,%r14 3f: 43 rex.XB