loop8: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc7-syzkaller #0 Not tainted ------------------------------------------------------ syz.8.700/11333 is trying to acquire lock: ffff8880585113e8 (mapping.invalidate_lock#9){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] ffff8880585113e8 (mapping.invalidate_lock#9){++++}-{3:3}, at: filemap_fault+0x6e8/0x1950 mm/filemap.c:3331 but task is already holding lock: ffff888079808198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] ffff888079808198 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6114 [inline] ffff888079808198 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6174 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __might_fault+0xc6/0x120 mm/memory.c:6716 _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] ni_fiemap+0x57c/0x18c0 fs/ntfs3/frecord.c:2139 ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1352 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 -> #1 (&ni->ni_lock/5){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline] ntfs_fallocate+0x5c7/0x1270 fs/ntfs3/file.c:609 vfs_fallocate+0x569/0x6e0 fs/open.c:333 do_vfs_ioctl+0x2583/0x2e40 fs/ioctl.c:886 __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 (mapping.invalidate_lock#9){++++}-{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_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] filemap_fault+0x6e8/0x1950 mm/filemap.c:3331 __do_fault+0x135/0x460 mm/memory.c:4882 do_read_fault mm/memory.c:5297 [inline] do_fault mm/memory.c:5431 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x2d1c/0x6820 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077 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 fault_in_readable+0x173/0x2d0 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x259/0x6d0 mm/filemap.c:4044 ntfs_file_write_iter+0x69c/0x7a0 fs/ntfs3/file.c:1259 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:683 ksys_pwrite64 fs/read_write.c:798 [inline] __do_sys_pwrite64 fs/read_write.c:808 [inline] __se_sys_pwrite64 fs/read_write.c:805 [inline] __x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:805 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: mapping.invalidate_lock#9 --> &ni->ni_lock/5 --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&mm->mmap_lock); lock(&ni->ni_lock/5); lock(&mm->mmap_lock); rlock(mapping.invalidate_lock#9); *** DEADLOCK *** 3 locks held by syz.8.700/11333: #0: ffff888024f58420 (sb_writers#23){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ffff888024f58420 (sb_writers#23){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:679 #1: ffff888058510af0 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: inode_trylock include/linux/fs.h:835 [inline] #1: ffff888058510af0 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: ntfs_file_write_iter+0x291/0x7a0 fs/ntfs3/file.c:1232 #2: ffff888079808198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #2: ffff888079808198 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6114 [inline] #2: ffff888079808198 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6174 stack backtrace: CPU: 0 UID: 0 PID: 11333 Comm: syz.8.700 Not tainted 6.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 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_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] filemap_fault+0x6e8/0x1950 mm/filemap.c:3331 __do_fault+0x135/0x460 mm/memory.c:4882 do_read_fault mm/memory.c:5297 [inline] do_fault mm/memory.c:5431 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x2d1c/0x6820 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077 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:fault_in_readable+0x173/0x2d0 mm/gup.c:2235 Code: 00 fc ff df 4c 89 e8 4f 8d ac 25 ff 0f 00 00 49 81 e5 00 f0 ff ff 49 39 c5 72 7a e8 d7 75 b6 ff 4c 39 eb 74 7d 4c 89 64 24 08 <44> 8a 23 43 0f b6 04 3e 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10 RSP: 0018:ffffc9000b5ffa00 EFLAGS: 00050287 RAX: ffffffff81de63d9 RBX: 0000000020008000 RCX: 0000000000040000 RDX: ffffc90011a61000 RSI: 00000000000023f1 RDI: 00000000000023f2 RBP: ffffc9000b5ffab8 R08: ffffffff81de636c R09: ffffffff84b24ee9 R10: 0000000000000002 R11: ffff88802fd98000 R12: 0000000000001000 R13: 0000000020009000 R14: 1ffff920016bff48 R15: dffffc0000000000 fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94 generic_perform_write+0x259/0x6d0 mm/filemap.c:4044 ntfs_file_write_iter+0x69c/0x7a0 fs/ntfs3/file.c:1259 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:683 ksys_pwrite64 fs/read_write.c:798 [inline] __do_sys_pwrite64 fs/read_write.c:808 [inline] __se_sys_pwrite64 fs/read_write.c:805 [inline] __x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:805 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: 0033:0x7fc55ab7e719 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:00007fc55b916038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fc55ad35f80 RCX: 00007fc55ab7e719 RDX: 000000000000fdef RSI: 0000000020000140 RDI: 0000000000000005 RBP: 00007fc55abf139e R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc55ad35f80 R15: 00007fffbe0bd438 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 4c 89 e8 fisttps -0x18(%rcx,%rcx,4) 4: 4f 8d ac 25 ff 0f 00 lea 0xfff(%r13,%r12,1),%r13 b: 00 c: 49 81 e5 00 f0 ff ff and $0xfffffffffffff000,%r13 13: 49 39 c5 cmp %rax,%r13 16: 72 7a jb 0x92 18: e8 d7 75 b6 ff call 0xffb675f4 1d: 4c 39 eb cmp %r13,%rbx 20: 74 7d je 0x9f 22: 4c 89 64 24 08 mov %r12,0x8(%rsp) * 27: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction 2a: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax 2f: 84 c0 test %al,%al 31: 75 18 jne 0x4b 33: 44 88 64 24 40 mov %r12b,0x40(%rsp) 38: 48 rex.W 39: 81 .byte 0x81 3a: c3 ret 3b: 00 10 add %dl,(%rax)