Hello, syzbot found the following issue on: HEAD commit: c02d24a5af66 Add linux-next specific files for 20241003 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=126f5307980000 kernel config: https://syzkaller.appspot.com/x/.config?x=94f9caf16c0af42d dashboard link: https://syzkaller.appspot.com/bug?extid=3d96bb110d05e208ae9e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/641e642c9432/disk-c02d24a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/98aaf20c29e0/vmlinux-c02d24a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/c23099f2d86b/bzImage-c02d24a5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3d96bb110d05e208ae9e@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 32768 to 0 syz.0.409: attempt to access beyond end of device loop0: rw=2048, sector=18728, nr_sectors = 4 limit=0 ============================================ WARNING: possible recursive locking detected 6.12.0-rc1-next-20241003-syzkaller #0 Not tainted -------------------------------------------- syz.0.409/9596 is trying to acquire lock: ffff88805e4b0c90 (mapping.invalidate_lock#6){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:860 [inline] ffff88805e4b0c90 (mapping.invalidate_lock#6){++++}-{3:3}, at: xfs_buffered_write_iomap_end+0x20c/0x490 fs/xfs/xfs_iomap.c:1246 but task is already holding lock: ffff88805e4b0c90 (mapping.invalidate_lock#6){++++}-{3:3}, at: xfs_ilock+0x193/0x3d0 fs/xfs/xfs_inode.c:156 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(mapping.invalidate_lock#6); lock(mapping.invalidate_lock#6); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz.0.409/9596: #0: ffff888077bc0420 (sb_writers#19){++++}-{0:0}, at: file_start_write include/linux/fs.h:2950 [inline] #0: ffff888077bc0420 (sb_writers#19){++++}-{0:0}, at: vfs_fallocate+0x4fe/0x6e0 fs/open.c:332 #1: ffff88805e4b0af0 (&sb->s_type->i_mutex_key#27){++++}-{3:3}, at: xfs_ilock+0x102/0x3d0 fs/xfs/xfs_inode.c:148 #2: ffff88805e4b0c90 (mapping.invalidate_lock#6){++++}-{3:3}, at: xfs_ilock+0x193/0x3d0 fs/xfs/xfs_inode.c:156 stack backtrace: CPU: 1 UID: 0 PID: 9596 Comm: syz.0.409 Not tainted 6.12.0-rc1-next-20241003-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037 check_deadlock kernel/locking/lockdep.c:3089 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891 __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 filemap_invalidate_lock include/linux/fs.h:860 [inline] xfs_buffered_write_iomap_end+0x20c/0x490 fs/xfs/xfs_iomap.c:1246 iomap_iter+0x220/0xf60 fs/iomap/iter.c:79 iomap_file_unshare+0x380/0x6d0 fs/iomap/buffered-io.c:1343 xfs_reflink_unshare+0x173/0x5f0 fs/xfs/xfs_reflink.c:1681 xfs_falloc_unshare_range+0x164/0x390 fs/xfs/xfs_file.c:1033 xfs_file_fallocate+0x289/0x3d0 fs/xfs/xfs_file.c:1125 vfs_fallocate+0x569/0x6e0 fs/open.c:333 ksys_fallocate fs/open.c:356 [inline] __do_sys_fallocate fs/open.c:364 [inline] __se_sys_fallocate fs/open.c:362 [inline] __x64_sys_fallocate+0xbd/0x110 fs/open.c:362 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: 0033:0x7f3f1df7dff9 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:00007f3f1ee0b038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f3f1e135f80 RCX: 00007f3f1df7dff9 RDX: 000000000000000a RSI: 0000000000000040 RDI: 0000000000000004 RBP: 00007f3f1dff0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3f1e135f80 R15: 00007fffd33b9598 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
